Chris confirmed the first SIS beam would be Na+1. Next Rb+1 and then Li+1

Elog is now functioning. We can start entering notes

20Ne+2 beam optics saved as 150914_1117_ios0iosfc6.snap

Service of MCIS.  Plasma chamber cleaned.  Repaired shorted, Right steering plate.  Added shields to help prevent coating of wires.  Beam is off centre on first collimator of steering assembly.

Moved Ground electrode away from PE approximately 0.10".

  Note:  the plasma chamber and ground electrode tip are clean.

2015-05-19  Repaired shorted MWS PE.  Internal short was found.  The source chamber was vented and cleaned.  The beaker was replaced with a new one (it was coated with carbon).  WPI2015-05-19-2

Investigate Shorted MWS PE and MCIS shorted steering plate WOI2015-05-19-1

A water leak was reported inside the HV cage (FR#8079).  The cage was accessed to determine the source of the leak (WP#I2015-04-27-1).

The WMS cusp cooling line was leaking.  It was close to the MCIS cart (at ground) and had sparked through.  The hose was cut at the puncture location and re-connected. to the fitting.  It was re-routed to be further away from the MCIS cart.

The OLIS 1 week shutdown has been completed (WP 2015-04-13-1).

General-

Y-Box insulators were inspected and look good.  Beamline optics were inspected.

MWS-

The La disk was removed.  Source housing was cleaned and re-asssembled with a beaker installed. 

MCIS-

The cart was installed in the HV cage.  Kr gas pack was installed on the cart and the transfer tube was opened up to MCIS vacuum.

SIS-

Source PE and EE assembly was removed and opened up for inspection.  A new source was assembled (1/4 Ta tube and 0.040 Ta Oven & Ionizer wires) and installed.  Lithium Nitrate Anhydrous (ALFA #13405 TR#205938) was inserted in the oven.

Additional details-

M:\OLIS\OFF LINE ION SOURCE\DOCUMENTS\Shutdown Work

OLIS MWS is currently running an producing 22Ne2+

The MCIS was vented with nitrogen yesterday.  The Se oven was drawn back into the tuner.  It was removed with the tuner and blanked.

The standard quartz window was removed and replaced with a ceramic, test window supplied by CPI. (p/n VWU2054).  The system is currently pumping down.

141125_1159_OLIS_76Se+13.snap is saved in reference directory.

El=3480/4303V

MCIS:YCB1=110

MCIS:XCB1=190

MCIS:CCB1=300

Frequency = 14.44765GHz

Amplitude = -10.880

TET FP= 9.8W

TWT RP = 1.8W

MCIS-

the Se was loaded into the oven last friday (21st).  During the weekend the presence of 76Se +11 to +15 was verified.

NOTE- the oven p/s on the cart is broken.  An attempt was made to remove it on friday.  It may be possible to remove, if the rack it is mounted on is loosened and turned.

SIS-

the Ionizer p/s control cable was removed to allow for local operation.  Keerthi tested the power supply in local mode on the weekend and found that the voltage did fluctuate.  This was confirmed by changes in the beam current.

Set-up pictures are located in -

M:\OLIS\OFF LINE ION SOURCE\SURFACE SOURCE\Single Source - Purchased Box\PICTURES\2014-11-21 Voltage Fluctuation setup

Ionizer Power supply + is connected to the common on the SIS source

Ionizer Power supply - is connected to the Ionizer on the SIS source

a cable is connected from the SIS main, bias plate to the negative terminal on the p/s.

I updated the electrical Diagram  for OLIS Faraday Cage with 3 Ion Source, ref: ISK4586D rev. 2

PS:  Make sure that you do not connect both Bias P/S on same Ion Source ...

There has been no noticeable loss of communication to the ALGA 50watt amplifier.  As a test, the ethernet cable was removed for about a minute and then reconnected.  The amplifer re-established communication without issue.  This test was done twice.

Now, the CPI ethernet cable has been returned to the CPI amplifier.  The original ALGA ethernet cable (blue) has been reconnected to the ALGA.

PS  The nitrogen bottle has been replaced.

The ethernet cable from the CPI TWT amplifier has been temporarily moved to the Alga 50W amplifier.  The Alga had been experiencing loss of communication.  This has not been an issue with the CPI so this cable will be tried with the Alga.  A signal generator is not connected to the Alga.

A new SIS source has been installed.  The oven has been loaded with Sodium Hydrogen Carbonate (Alfa Aesar 10863) and Rubidium Nitrate.

Pictures are located in 2014-11-13 Source and PS Pics

Today we replace the in-line resistors for the Plasma Electrode (PE) it was a 25 ohm 200W (2 x 50 Ohm 100W) with a 50 Ohm 200W (2 x 100 Ohm / 100W) also added the inductance coil.

This is R5 on drawing: ISK4583D rev. 10

This was done to reduce the power on R5

Note: We still need to make sure the the FAN is running to cool the resistors when the PE P/S is ON.

MCIS-

the source is off.  It is under vacuum and in the HV cage.

SIS-

the test filament assembly has been removed for inspection and the port blanked.  Ray D. noticed that the Swagelok connections for the water manifold are extremely close to each other (potential short).  Yesterday, when reducing the current on the ionizer the voltage varied significantly.  The currently on the FC also changed.

The temporary collimator installed in the 4-1/2 CF port has been modified.  the through hole opening has been increased from 3mm diameter to 6mm diameter.

Supernanogan is running with oven no heat, without 76selenium. MCIS:IG1=3e-7Torr.

Tune saved as 141101_1318_76Se+11tune.snap

MCIS steering  X=330, Y=226, CCB1=500, MCISEL=4171/5157, PE=11.5/23, FC6=76nA(16O+7)

MCIS-

the MWS Bias and PE have been moved on to the MCIS (the MCIS connections have been removed).

The plug in power to the HP Signal generator has been moved to a continuous source (Removed from the source controlled by the SSW).

SIS-

a test filament assembly has been installed in the SIS.  No chemicals have been loaded or alignment done on the oven / ionizer.  It has been installed just as a test.

A/q           FC6  (only current over 100pA)

6.0           1.85e-7

6.15         4.96e-10

6.23         2.4e-10

6.31         6.14e-10

6.39         2e-10

6.51         1.82e-9

6.90         2.7e-10

7.00         5e-8

7.1           4.6e-9

7.27        1e-10

7.5        3.32e-10

A/Q            FC6

4                1.1e-6

4.25          8e-10

4.34          1.2e-9

4.42          5.5e-9

4.51          2.59e-9

4.58          1.7e-10

4.66          1.7e-10

4.74          1.7e-10

4.85          4.6e-10

5.0            1.36e-10

5.07          1.5e-10

5.13         2.69e-10

5.25         4.89e-10

5.33         9e-7

5.39        3.0e-10

5.56        3.3e-10

5.67        1.12e-9

5.7          5e-9

5.83       4e-10

5.92       2e-10

6.000     1.85e-7

IOS mass scan if faulty. These is a manual scan from mass 3 to 4

Const22 = 0.04187  adjusted to mass = 4

A/q               FC6           X          Y 

3.0075        8.14e-8      398  237

3.1222        4.93e-10   398  237

3.2064        6.24e-7     398   237

3.2613        1.05e-9     408   237

3.3395        2.29e-10   408  237

3.4072        5.6e-10     408  237

3.5089        3.36e-8     408  237

3.5600        1.4e-10     408  237

3.6069        1.86-9       408  237

3.6436        8.46e-10  408  237

3.7514        4.02e-10  418   237

3.8387        4.37e-9    418   237

3.8883        3.43e-10  418   237

3.9416        1e-10       418    237

4                   1.1e-6     418    237       500  

IOS mass scan does not work.

A/Q            FC6                X          Y          CCB1

1                2.07e-7        167      97       500

2                2.18e-7         308     247

2.14          1e-11             388     277 

2.246       2.07e-8         358     227

2.30          2e-9             378      227 

2.366       1.28e-8         388     277

2.392        2.1e-11        388     277

2.4641      1.98e-11     388     277

2.5345      6.49e-11     398     277

2.5614     1.81e-10      398    227

2.6263     2.95e-7         398   227

2.7522     2.07e-8         398   227

2.7896     2.06e-10       398   227

2.8652     3.22e-11       398   227

2.9515     8.52e-8         398   237

MCIS-

a new oven assembly was installed on the MCIS yesterday.  The cart has been installed in the cage and is connected.

The power is connected to the cart oven as is the MCIS bias.  it is currently on and being tested for Se

MWS-

Keerthi removed the Be electrode and installed the quartz beaker.  There is quite a bit of a copper coating inside the source.

MCIS-

the cleaning has been completed.  The oven assembly is removed and the gate valve closed.

The quartz tubes on the ground electrode have been installed with the larger diameter tube pushed as far downstream (toward the optics box) as possible.  The smaller tube has been positioned to extend 1-3/4" into the plasma chamber w.r.t. the insulator flange.

Currently the turbos are running and the source is pumping down.

Note-

there was a Controls problem when trying to operate the source.  They tracked the problem down to a bad ethernet communication cable.  A temporary cable is in place while a new one is being prepared.

MCIS-

cleaning out source to remove potassium and calcium.

Areas cleaned with scotch-brite and then wiped with methanol:  plasma chamber, tuning chamber (ports opened for access), TP3 tube.  The inside of the ground electrode tip has been removed and sand blasted clean.  The inside of the ground electrode has been wiped as much as possible (very limited access).

 The ALGA amplifier has been unplugged and moved.

The nitrogen bottle needs to be replaced.

MCIS-

Does not appear to be producing very much Se.  There is a lot of calcium and potassium.

Cart is removed.  Unplugged CPI amplifier.   No extra time for investigation.  Set-up required for MWS.

note:  one cart wheel is damaged.  will need to service, or replace in s/d.  other wheels will need to be check as well.

MWS-

Changed to Be plasma electrode for upcoming experiment.

The ALGA amplifier and its signal generator have been turned off at the request of Controls.  They have had communication issues and are looking for any recent changes.

The remaining connections were done on the MCIS. 

A piece of 1/8" teflon was installed between the back of the sputtering tube/motor and the HV cage.

Ray confirmed the cart power supplies (heater and sputtering) Epics page readouts for Voltage and Current are okay.  The Heater p/s was left plugged into the cart receptacle.  The Sputtering p/s's are unplugged.

The MCIS:FC0 OUT limit was not actuating.  It was adjusted.

Keerthi tested the oven last night and was getting Se (14/10/24 it appeared to be Se, but the Prague magnet was not working.  Further investigation revealed it was not).  The oven supply is currently bypassed and ON.

Evigeny is working on the Alga and CPI amplifiers.  Both signal generators and the amplifiers are powered ON and connected.  Alga to the dummy load and CPI to the MCIS.

MCIS-

the cart was moved into the HV cage.  The facilities will be connected and an oven will be tested for the upcoming Se experiment.

Will take measurements for installation of key interlocks on cart power supplies.

SIS-

the filament assembly was removed for inspection.  When increasing the ionizer current it would work correctly until about 20 amps.  Then the current would stop (like an open cct).

MWS-

will prepare for Be later this week.

This entry was incorrectly added to the OLIS logbook.  it has been moved to the I3 logbook.

We did a test yesterday with the new Alga Microwave RF AMP, model # ALPA 50 Watt, serial # 130684 to be used for the MCIS.  We used the RF Generator from MISTIC and set the frequency to 13.80 Ghz, note that the RF Generator was/is  limited to 16DB maxiumum RF output.

The RF cable that we used was from the 200W RF AMP, it has a 20DB SMA attenuator at the Generator end, so we could only get about 25 Watts maximum output.

I found these files about the MCIS in Geoff folders in M:\ISIS\Geoff-110715\OLIS\SuperNanogan

Today Probe group (Scott K.) installed the OLIS Attenuator, they fixed the vacuum leak on Attenuator #2,  Marco M. asked them to remove Attenuator #1 because it is not needed and confusing for Ops;

Attenuator #1 was an experiment that Marco M. asked for, it was the same as Attenuator #2 but with 45 degrees offset, the results were not good and he decided to remove it.

Arthur and Derek had a look at the OLIS Bender Magnet P/S and found a problem with the Polarity Switch, it was set up upside down, they fixed that.

Note: We do not need a Polarity Switch for OLIS may be we should remove or bypass it, at the moment when the PS goes OFF we need to use the reverse Polarity to Bend the Beam the right way.

We spent most of the day looking at OLIS to find out why the "Ionizer Coil" keeps breaking down, we found the following:

1.  The FAN to cool R5 (ref: ISK4583D rev.7) a 25 Ohm 200W Resistor (2x50 ohm/100W ea.) was not ON, the nylon insulator (also the plastic tube across to the HV Terminal) was burnt and not holding the R5 resistor properly, I replaced the plastic insulator with a ceramic insulator.

Note that if the PE electrode is open it will charge up to the beam energy and start sparking.  Also I used a red heatshrink tubing to prevent the BNC connector (it sits at Common) to touch the Cu pipe for the Plasma electrode water cooling.

2.  Drawing for PE Polarity Switch: ISK4386D rev. 5

3.  Drawing for EE:SS BOP (resistors & spark gap): ISK4584D rev. 1

4.  Drawing for OLIS Surface & McroWave Source electrical diagram: ISK4583D rev. 7

Attached is the scheduled work for OLIS next week.

I updated 2 drawings that show the OLIS skimmers.

A.  ISK4363D for the OLIS Skimmers BOP connections, we have 7 skimmers cables (6 wires per cable) going in and 16 skimmers channel going out to Controls.

B.  ISK4365D that shows the skimmers cables location along the OLIS beamline.

I created a new drawing: ISK4586D that shows the Optics for OLIS with 3 Ion Source.

I updated an old drawing ISK4478D (MS & MCIS Optics) and created 2 new ones: ISK4583D (Electrical Diagram for SS & MS) and ISK4585D (SS & MS Optics)

If you see any errors please let me know.

Last January 17th 2014 we removed an in-line resistor (100K 10W) from IOS:YCB1A because we do not think that it is needed.

Controls group may need some assistance from OLIS group in order to trouble shoot the problem.

IRIS beam delivery is completed with extra 3 days of beam providing to them.

18O2 and 40Ar+2 were delivered with few attenuators i place.

During the last week we delivered 18O+2 from microwave ion source to Ritu.

Over the week end changed to 40Ar+2.

Ritu informed us 18OH2 is coming with 40Ar+2.

Moving the slits ops managed to reduce 18H2 contaminant from the beam.

Good lesson for the future. Bad combination one after the other.

MCIS finished xenon development. MCIS is off and isolation valve is shut.
A new oxygen gas line is installed to microwave ion source via a hand valve neat PE.
Hand valve is tuned as a small leak so that the plasma can run with all other gas valves are shut.
However if one need to start the source Ne gas valves are needed to be opened.
A 3.13nA of 16O+2 is sitting at FC6 and ready to use as pilot beam.

Removed titanium from the back plate and clean the source.

But left the PE titanium insert since Bob and Marco badly want the 12C++ beam from the source fast.

Background 12C++ was only 400pA so installed a small canister with CO in it with bellow atm. pressure.

Now source is running with ~2nA current.

Supernanogan on overnight with 36Ar+7 on FC6. Nice.

Today is the last day of scheduled OLIS Shutdown. Expect more source development today followed by a hand-off to ICR at some point.

Supernanogan 36Ar+7 source development in progress. RF frequency scans are the agenda for today.

Later... Some good beam results and 300enA beam on FC6. Note: 5mm slits are in.

Supernanogan is online with 36Ar+7 on FC6 overnight. Looks good. Note: The source gas arrangement (enriched 36Ar) utilizes double buffer canisters and calibrated leaks, and requires MCIS:TP3 off.

Controls is preparing to perform an IOSIOS reboot for the sake of new code for ILT:RPM8 or something like that.

IOS pumped well over the weekend. Present pressure is 1.5e-7. MCIS pumps off for setup.

Later... Supernanogan is online with better than 250enA of 36Ar7+ on FC6 presently ~17:00. Note: MCIS:TP3 is off by intention for this run.

MCIS continues to pump well. IOS DB assembly planned for today.

Later... DB assembly complete and IOS under vacuum. Present pressure: 1e-6 Torr at ~18:00. All optics hold voltage.

MCIS pumped well overnight. Source development imminent.

Later... possible IOS intervention. Spin down turbos in anticipation... Meanwhile, MCIS pressure was at 7.8e-8 Tott at the start, and dropped to 7.4e-8 Torr immediately upon closure of MCIS:IV1. Note that IOS:IV0 remains open with interlocks bypassed.

MCIS pumpdown continues well. IOS optics coming along. DB3 installed last night and IOS is under vacuum very early. DB1/2 optics will remain out until the end of the next-up MCIS run.

MCIS pumped overnight. Still coming down.

Two weeks of OLIS Shutdown have begun. The plan is to complete refurbishing this week and pump next week, with 36Ar+6 beam ready at the end of it. IOS is vented and open. The Supernanogan cart is out, vented and open. Plasma chamber cleaning and refurbishing in situ are in progress. The IOS upstream optics DB1-3 have been removed for refurbishing on the bench.

Later... Supernanogan MRO completed and closed. Pumping underway by ~15:30. Leakup curve appended below.

Deliver concluded yesterday morning around 09:00. Pity to have to switch off the source. OLIS is now in its Shutdown.

Delivery continued overnight.

Delivery continued uneventfully overnight and is continuing.

Later... source is just getting better and better. See Stripchart below.

Beam petered out earlier this morning after an attempt to tweak the RF frequency. Restored. Plasma was on throughout. ICR has lowered RF amplitude to match beam intensity to yesterday's running conditions.

Delivery since Friday Beam on but intensity is dropping, suggesting that enriched 33S powder is running out. Plan in place to add more this evening.

MCIS configured for 33S+6 yesterday afternoon. Beam grew nicely overnight. Beam development expected after source hand-off.

Cocktail beams continue today.

Source set up for a cocktail beam since yesterday, Sunday.

Source setup took place earlier this morning.

Slit calibration exercise was wound up this morning. MCIS source gases were reconfigured with 19F and 40Ar by request. A "cocktail" beam will be used for HE development over the Thanksgiving weekend. A mass scan is in progress presently.

The source stayed up overnight. A little RF tweak, but 33S+6 beam still on FC6.

Later... IOS:MCOL3 slits calibration with beam in progress.

Beam development with 116Sn+18 finished last evening around 21:00. Source was off overnight. 33S material loaded into MCIS oven. Source pumped overnight.

Later... source is lit. 33S+6 on FC6 and growing.

On Friday there was a request to repeat some of the findings with tin beams. An agreement was made to use OLIS for development in lieu of Shutdown MRO as scheduled. MRO is planned for November 2nd &ff. HE development took place over the weekend with 116Sn+18, A/q=6.44.

Next up: 33S source development. Setup this evening.

Development with Supernanogan source continues. Present beam is 40Ar+7, about 70enA.

40Ar source gas, ergo 40Ar+x beams. 40Ar+6 earlier, and 40Ar+7 presently.

Beam development for forthcoming 36Ar run is in progress. Initial yield numbers have been determined. Source is running with Ar plasma presently, and tests will be repeated after source has conditioned for a while. The goal is to determine yield numbers of 40Ar and scale these to beam to be produced with source gas of enriched 36Ar. FYI:

Naturally occuring isotopes of argon:

Ar-36 ( 0.3365% )
Ar-38 ( 0.0632% )
Ar-40 ( 99.6003% )

The 17O+3 (A/q=5.66) run to TACTIC finished yesterday morning. Then a source switchover was done to deliver 13C+3 (A/q=4.33) using enriched 13CO2 source gas.

Later... TACTIC is done. Next up: beam development at MCIS for upcoming 36Ar run.

Delivery continues. 14N+3 until mid-morning, then a switch to 17O+3 for tuning. The switchover from 116Sn to TIGRESS to 14N+3 to TACTIC was done on Tuesday mid-morning.

Delivery continued over the weekend with some interruptions here and there. A source intervention was made late last night and into the wee hours, and again this morning. Tuning to TIGRESS has resumed.

Note that ICR was using a 12C+2 beam for setup purposes. Their procedure was to turn off MCIS when beam not in use to minimize carbon contamination in the source. 12C+2 -> 116Sn+18 last evening around 21:00 with source expert present.

Beam was changed to 14N+2 last evening for sake of tuning to front of RFQ. Source was tweaked earlier. Beam is presently set to 116Sn+18 with tuning activities in progress.

Source switchover began last night after 22:00. There are some 200epA of A/q=6.46 (116Sn+18) on FC6 presently. Setup and tuning continue.

Natural abundances of Sn:

Sn-116 ( 14.54% )
Sn-117 ( 7.68% )
Sn-118 ( 24.22% )
Sn-119 ( 8.58% )
Sn-120 ( 32.59% )
Sn-122 ( 4.63% )
Sn-124 ( 5.79% )

Later... ~70epA at FC6 after some conditioning and fiddling.

Beam delivery was scheduled to end last evening at 20:30. It was extended to around 22:00, at which point source switchover began.

Delivery continues. Nice consistency. See attached Stripchart. A source switchover is scheduled for today, tonight, as it turns out. Good luck with that.

Delivery continued through the night. User was taking the beam. Recovery from a DTL tank trip is happening at the moment. Otherwise, beam is very good. And strong.

Setup began around 09:00. 400enA of A/q=6 on FC6 presently.

Later... By ~14:00 beam looks pretty good. See Stripchart below.

Delivery continued through the weekend. Some 300nA on FC6. The run ended at around 09:00. Source switchover is in progress now.

The 58Ni delivery from MWS to TITAN ended last evening. Beam was unused from about 18:30, and source switchover began at about 22:00. A 4He1+ beam from MCIS was established by 03:00 this morning. Around 35pA is available on FC6 presently. Note that at A/q=4, there are likely contributions from 12C+3 and 16O+4.

Delivery continues. Source change scheduled for 20:30 this evening.

Pilot beam delivery continues. Keerthi came in over the Labor Day weekend to help out on something.

Beam is scheduled for one more day. A source change is scheduled for 20:30 tomorrow.

Beam idled overnight. Average ~50pA at FC6. About half that on ILE2T:FC3 presently. Setup on TITAN side in progress.

Later... ICR is concerned about the OLIS separator magnet wandering during the day. It's sunny today, so I would expect a little more wandering than on a rainy day. Also, they have significantly higher current at A/q >58.1 and asked if there could be another mass in the mix. Checking.

Later... TITAN takes coffee break. Opportunity to do a mass scan and also tweak source. Confirmed that centroid of mass peak is ~58.2. (Note: Slits left open for scan, so resolution is low.)

Note: Since this morning magnet adjustments, there are some 200pA of beam at FC6.

Beam was established yesterday. It has grown nicely overnight.

Beam on FC6 drifted overnight. Touch up a few things, notably the EE. 25pA on FC6 presently. I also increased microwave power for effect.

Later... about 25pA on FC6. Somewhat noisy, but also stable. I left microwave at 700W. Beam handed over to ICR at ~13:15.

A note about mass flow controller. The new Hastings controllers do indeed shut off completely at zero setting. It should be noted that control in the sub-1sccm region is challenging. Move in 0.01 steps. I found that everything was fine down to 0.15sccm. The next step after that, i.e. to 0.14, closed the flow entirely. Not a crisis in this situation.

Source switchover from MCIS to MWS. Support gases and liners were pre-fitted. Source lit. Optics set for 20keV operation. ~50pA on FC6.

We are on orders to retain OLIS for accelerator development. The switchover to 58Ni, scheduled for this morning, is on hold.

Meanwhile, there were WFB1 and PV1 trips this morning. All reset and beam is on. The WFB paddle for the MCISRFS circuit was still rotating at a reasonable rate. I adjusted the WFB setting for ON state with minimum flow.

Later... Beam is still sitting on FC6, very happily, I might add.

Later... at 14:40 I called ICR for clearance to switch beams. Consult with Bema Experts... Yes, I have clearance. Close IV7. EOB for 17O3+.

Delivery continues on autopilot. Looking good. ICR noted that a seemingly unusual number of tweaks to the IOS separator magnet have been required. This is not so surprising, given that the magstab program is not running presently. It is expected that today will be EOB for DRAGON. A switch to 58Ni is on deck.

Later... DRAGON is finished taking beam. ICR is using the beam to set up the accelerators. Beam switchover and maintenance for IOS:IG8 replacement will happen in the morning.

Delivery continues.

Delivery continues. There were several "PV1" trips over the past several days. ICR now has a recipe for resetting this condition. We await a general instruction from ICR via email.

Meanwhile, MCIS:TP3 was off for the last while. ICR notified. Investigating. Turned on again.

Later... At this charge state the source works better with TP3 off. See attached Stripchart.

Delivery continues. The attached vacuum trar suggests that this is about as good as it's going to get. On the other hand, there is a uA of beam on FC6.

Setup in progress. No foil at M:5. Source has been running since yesterday. Note that source was opened recently for MRO. Vacuum pumpdown chart for past several days attached.

Later... ~10:00 ICR reported MCIS:PV1 closed. On closer inspection, it was pretty clear that the classic PLC "all PVs go to zero" state occurred sometime earlier this morning, etc. ICR has restored vacuum. Now to restore the source...

The source was configured and switched over on Friday. Some teething pains over the weekend. Beam is on FC6 presently.

Cart removed for source servicing. Source opened and split at front seal. Ground and plasma electrodes removed. All internal areas cleaned. Source reassembled. Initial pumping in progress. Leak-up curve a little soft, but reasonable given the cleaning materials used: methanol, acetone, Simple Green.

Source started at 800W of microwave power and 2cc/min neon gas easily. New magnetron produces more power than the old one.

We should try to keep MW power under 500W during running and use only 800W for ignition.  EE left off for the night.

There have been teething pains developing a good 27Al beam. The Supernanogan sputter source ate through aluminum rods like candy. The MWS worked for a while, but would not hold a sustained plasma. IOS was opened a couple of times to clean the MWS. It ran for a while today, then blinked out. Leak checking is in progress. But the source looks pretty tight from that point of view.

Update at 16:30: Bob has declared EOB for the 27Al run. Next up next week: 22Ne2+, from MCIS if bias will hold comfortably at 22kV.

Source is now pumping down. Damien, Please start the source as soon as you arive. Try to keep PE current below 500mA. Optimum is ~200mA

The DRAGON run finished this morning. Switchover to 27Al+6 in progress now.

Keerthi came in early this morning to set up OLIS for 24Mg delivery. HEBT tuning is in progress.

Keerthi came in on Saturday morning and set up the Supernanogan source for 4He delivery. It looks like it went well. The original intent was to use the MWS for this, but sputtering got in the way. He also came in yesterday to tweak the recipe to minimize 16O4+ and 12C3+ (A/q=4) contribution to the beam. The run finished last night.

25Mg beam mostly sitting on FC6 now, as HERACLES takes RIB. Source was opened on Monday night to replace microwave window. Beam will be u sed again towards the end of the HERACLES run, then EOB tomorrow morning, Saturday.

Well, the plasma electrode shorted again, and Keerthi came in on Saturday to tear down the MWS and clean it. Beam is steady as she goes presently. Delivery continues today in lieu of RIB unavailability for today. A switch to RIB is expected this evening.

Beam on FC6 overnight and very stable. It grew overnight and continues to grow, but hasn't hit 1pnA yet. Marco is tuning with what he has. Let's see how it goes.

Meanwhile, the last Mg/MWS run occurred on October 27, 2010.

Source settings: https://elog.triumf.ca/OLIS/General/101027_104242/grab.aO2483.png

Support gas settings: https://elog.triumf.ca/OLIS/General/101027_104322/grab.Yu2502.png

Trar chart of 26Mg on FC6 appended below. The natural abundances of 25Mg and 26Mg are similar.

Later... Marco reports no 25Mg at MEBT. See ISAC elog. Meanwhile, IOS mass scan of 24-26 appended.

Later... Play with source gases a little. Unexpected glitch: IOS vacuum is tanking... Settled at 1.2e-5 Torr. Checking... Looks like front collimator is plugged. Pretty good chance we were generating Mg beams. Meeting of minds... Consensus: Open and clean.

Later... Source opened and cleaned. Backplate and front collimator removed and serviced in the process. Pumping at ~16:15. Leak-up curve looks good.

Later... Source at high vac. Power on. Plasma lit like soft butter. Premature mass scan in progress. Done. MCOL3 restored to 5mm slit settings. Tiny beam on FC6. It can sit and grow overnight.

Hand it over to ICR at ~17:45.

Source conditioned nicely overnight at 55kV with a little RF power on. Source gases checked, final cage inspection. Ready to start.

Later... Source is lit. Let it grow.

Later... Lots of beam on FC3 but not a lot on FC6. Beam is broad. Hand it over to ICR for the night as-is.

Source opened, and aluminum components removed. Magnesium components from previous run cleaned and installed. Pumpdown in progress.

Later... Pumpdown looks wonderful. A couple of cycles with partial vent with N2 to help evaporate the methanol.

Later... Power is on. HV at 55kV for the night to condition. No plasma, no beam overnight.

DRAGON has been taking beam since approximately noon on Monday, and finished a little while ago. Feedback I have received is that beam intensity was lower than experimenters' ideal, but quality of the beam was very good. I will run an emittance scan shortly. Then next up: Mg setup.

A lot has happened since the last entry. The source blinked out at some point. Cause cited was a PE short. Actions were taken, to be detailed later. Source was re-lit. Beam on FC6 was unstable yet promising overnight last night. In the wee hours it blinked out again and is out presently. Remotely checked vital signs. The only thing that appears to require immediate intervention is the source gas line, which looks very closed. ICR assisted with a check on the Ar bottle at the OLIS gas rack. Previous state unknown. ICR opened bottle and shutoff valves. Pressures on regulator are nominal. There is zero flow across the flow controller. ICR is fully involved with 8pi beam services, so cannot open the OLIS cage at this time, etc. One of us will come in.

Later...Source is back. ~6pnA on FC6 at ~17:00.

Synopsis: Source support gas (argon) ran out due to leak in source gas line. Remedied. Bottle replaced. Source relit OK. Beam intensity went in steps.

Later... Some gains with EE. Leaving it at 7kV with 400W of MW power.

Source pumped overnight to previous baseline (red trace on attached Stripchart). IOPS conditioned it up to 42kV without a hitch.

Close Ne source gas line and pump out flow controller... noticeable improvement.

Bias conditioned up to 50kV.

Bias conditioning at 58.5kV with MW at 600W. Raising the RF outgassed the plasma chamber for the first while then went quiet again.

Bias set to 55.08kV for 27Al+1 run. Source lit around 14:30.

15:30: IOS:FC3 = 1.9e-5 (no bias); IOS:FC6 = 9.3e-9. It's coffee time.

16:40: IOS:FC6 = 4.9e-9 (attached)) after settling and a few little tweaks. We're just about ready.

16:45: Hand it over to ICR.

Switchover from 58Ni+1/MCIS to 27Al+1/MWS began just after noon. MWS cleaned and fitted with aluminum liners. Pumping in progress. Good leakup curve. All electrostatics checked and operational. Source should be conditioned to at least 55kV at some point. Let it sit at 30kV overnight with 100W on MW.

Last hours and minutes. Going well. Documentation appended. Users have requested beam until noon.

Note: We are using the MWS bias and EE power supplies on the Supernanogan source for this run, to provide source bias and also sputter chamber bias for the Supernanogan.

Beam mostly idle overnight. Things are resuming now.

From MCIS. It looks like things went fairly well over the weekend for them. An interlock glitch on MCIS:IV1 this morning, source pressure went slightly above MCIS:IG1 "Good" threshold. I have suggested to Tiffany that raising the "Good" threshold to 1e-7 might be a good idea. Because we are intentionally running with MCIS:TP3 off, the source pressure is higher. It's right on the edge of the current "Good" threshold. Attached is a trar of the MCIS pressure trend, which looks healthy.

OLIS was switched from 22Ne2+ (MWS) to 58Ni+1 (MCIS). Works like magic. 100epA presently.

MWS online. Beam sitting on FC6.

Mel returned two flow controllers today, borrowed in March and April.

MWS online. Note: A/q display is white. Possible culprit: IOSIOC. ICR will reboot it at first convenient opportunity.

Earlier, Supernanogan was set up with empty canister in preparation for Kr heavy ion run planned for this weekend. Canister and lines pumpdown in progress. However, a FR was issued for MCIS:BP1, which is losing ground pretty quickly. The two MCIS screenshots below were taken some five minutes apart. At this rate, there is no way the pump can bring the system to an operational pressure in time. For good measure, power-cycle BP1 now... it doesn't help.

MWS online. Separator magstab program offline. Check: Kepco is switched off and one lead is physically cut and taped over. That's pretty definitive.

Later... Keerthi has found that the EPICS probe has more diurnal variation than the separator power supply itself, so he disconnected it permanently. There is a USB issue with using our precision Hall probe that will require some expert Linux assistance to resolve.

DRAGON has been taking various species of Na and Rb using the MWS. Run ended this morning. Emittance scan of 23Na attached. Mass scan in progress.

Supernanogan is online with a bit of 12C2+ beam on FC6. Mag stability program is running. Source development to follow.

Hastings Teledyne flow controller lent to Mel.

Controls is working on an interlock issue. Electrical panel MCC-X maintenance is planned for tomorrow afternoon.

Loaned a Horiba SEC-7320 flow controller to Mel. This unit belongs to Friedhelm.

High Voltage cage is on at ~17:43pm

Interlock cleard and HV (10kV) is on at 17:53pm

IOS:SSW failed unexpectedly. No reason found. Came back on easily.

90pA of Ti+7 is running smoothly. 22:05  Feb26th

Small peice of titanium wire is installed and running aroung 100pA of Ti+7 at FC6.

OSAC are OPs taking data.

Small piece of titanium foil 0.0005" thick is installed and running around 100pA of Ti+7 at FC6.

OSAC are OPs taking data.

Klixon at the OLIS bemding magnet is not funtioning properly.

Both EE and SSEE problems were solved. They are working OK now.

2mm diameter Ti was installed to set the optics. Later 0.0005 in thick foil will be installed for real efficiency studies.

Our very best to all of you.

At 5:00 this morning, after a lengthy battle with cancer, Mike passed from this life to his eternal reward. He has left us a great legacy. May he rest in peace.

Development and the quest for gold continue.

Later... Mass scans in region of 197Au33 A/q=5.97, with graph of all theoretically possible charge states in the same A/q region. The thing to note in that last graph is how clean is the region (just left of A/q=6) where 197Au33 is predicted.

Later... Panning for gold ended prematurely due to a decision to end. The reason cited was DSB:MB14.

Development continues in the search for gold. A=197 Present A/q=5.94, which suggests 197Au+33. It could also be a tail of 12C+2. We'll see.

Source development in preparation for Au beam in progress.

Beam development started yesterday. Looks like the HERACLES run, which started Thursday, ended yesterday morning.

Development should continue today. Looks like Supernanogan went through a plasma mode change overnight and settled into a new mode.

The previous 12C2+ development run from the Supernanogan ended Friday morning. Starting Friday afternoon, the Supernanogan was prepared for an upcoming SEBT development using krypton beams. The source was ready overnight. There were some teething pains over the weekend. An A/q=5.71 beam is sitting on FC6 presently. The beam schedule shows an experiment change on Thursday morning.

Later... Some notes about krypton.

Naturally occurring isotopes:
Kr-78   ( 0.35% , 2.0E+21 ) Kr-80   ( 2.25% ) Kr-82   ( 11.6% ) Kr-83   ( 11.5% ) Kr-84   ( 57.0% ) Kr-86   ( 17.3% )

Some A/q values:

• 40/7 = 5.7143
• 80/14 = 5.7143
• 82/14 = 5.8571
• 82/15 = 5.4667
• 83/15 = 5.5333
• 84/15 = 5.6
• 86/15 = 5.7333

Keerthi's mass scans from Saturday:

1. Background scan
2. Krypton scan (note multi-peaks in A/q = 5.7 to 5.75 range)
3. FC6 at A/q=7.3333

Last moments of beam development for SEBT commissioning. Attached is an FC6 plot and the present optics and 1mm slits. Decision was to not do a vertical emittance scan at this time, but proceed with 15Kr development, up next. Before we shut off, one last emittance scan coming up.

Later... Emittance scan with 2.5mm slits (default position setting used) in progress... Done. 101203_1017ILTEMIT.txt. Looks a little boxy... Both raw and cleaned-up versions attached.

Next: Emittance scan with 5mm slits... Done. 101203_1039ILTEMIT.txt. Looks a little more boxy... Both raw and cleaned-up versions attached.

Next: Repeat scan with original 1mm slits and scanner settings... Done. 101203_1104ILTEMIT.txt. It reproduced. Both raw and cleaned-up versions plus scanner panel attached.

Next: Quick look at 16O beams before shutting off...

Accelerator development continues. Save: 101201_2157.snaiosvault. Today's agenda: emittance scans. Attached: overnight beam plus a preliminary horizontal emittance scan 101202_0951ILTEMIT.txt.

Later... First good scan 101202_1016ILTEMIT.txt.

Next... Second scan 101202_1016ILTEMIT.txt with FC at lower gain, due to lots of red in the first scan. Too noisy.

Next... Third scan 101202_1041ILTEMIT.txt, first the raw pic, then filtered a couple of ways.

Scanner parked, and beam on FC6 again. There is interest in doing a vertical scan. This will require physically moving the emittance rig to the perpendicular face of its diagnostics box. Awaiting decision.

Continuing from Supernanogan. Source touch-up last evening.

Commissioning and development continue.

Supernanogan is online. MCIS:TP3 is off. It should be on. It is required for best production of higher charge states.

Some start-up teething pains last night. Decision: Go with the Supernanogan for now. ~20enA on FC6. Save: 101125_1148.snapiosdragon. Also, a CANBUS card on IOS:YCB1A failed this morning and was replaced by Controls.

Source switchover began at ~15:00.

Last day of 85Rb delivery. Save: 101124_1400_snapiostitan. Next up: 12C2+ for SEBT commissioning. We took a few minutes earlier to see if this is available with the source as-is. No such luck. Plan is to shut off mid-afternoon, and prepare to switch over to 12C2+ operation from the MWS.

We are back to running a Rb beam using the MWS. The run started last Thursday, November 18th. The previous Rb run ended on Monday, November 8th, at which point a 12C2+ beam was established, using both sources; the Supernanogan was selected for final delivery to DRAGON. Users reported excellent beam. That run ended last Monday, November 15th, after which time source development ensued. Among other activities, the Supernanogan plasma chamber was opened and cleaned following the 12C run.

12C2+ beam established yesterday from the Supernanogan. Tuning to DRAGON began last evening and is continuing presently.

We noticed that MCOL0 no longer has a valid reading. A quick trar suggests it stopped reading at around 17:00 yesterday, right around the beam hand-off time. Also, after working fine since Controls adjusted it a couple of weeks back, the MCIS:RFS water flow meter began toggling its state again around the same time, and a defeat was required to run the RF.

A good 12C2+ beam was established yesterday from the Supernanogan source, driven by background pressure only; no source gas actively injected. Beam intensity was not sufficient, so we switched to the MWS. 12C2+ from the MWS sat on FC6 for the night, and grew over the time. Plan today: increase the intensity one way or another.

Later... We're going with the Supernanogan for this one. CO source gas set up via MWS gas manifold. Differential pressure over variable leak provides low enough flow. RF scan in progress presently ~15:00.

The 85/87Rb run from the MWS ended last evening as scheduled. The Supernanogan source was brought online (~21:30 Sunday?) and a 12C2+ beam established, first for ICR training then for DRAGON setup.

Beam was used yesterday. Mostly idle overnight. Looks like a plasma mode change happened at around 19:00 yesterday. It happens. Or perhaps just an artifact again. Shortly after, beam was moved to 87Rb, which is where it is right now. Once again, another milestone first at OLIS: 87Rb from the MWS.

Natural abundance of Rb: Rb-85   ( 72.165% ) Rb-87  ( 27.835% )

Later... Beam switched back to 85Rb.

Source ran nicely overnight. ICR team set up a tune into the Polarizer line. Experiment setup is scheduled to start tomorrow morning.

Yesterday we handed over a 85Rb beam to ICR. It will be used for a LEBT run using the Polarizer line. Beam stayed on FC6 overnight. Note the source spark at around midnight, after which the bias current readback was higher. Real or artifact?

Later... Beam status over last couple of hours. Looks like tuning has begun.

85Rb on FC6 overnight. After restarting the source yesterday following development, the beam intensity came back, but it's slightly unstable compared to before. Mag stability program is active.

Later... Work with the source for a while. Improved. Stripchart attached. Time will tell. Save: 101102_14:30.snapiosfc6. Turn it over to ICR now.

The source stayed up steadily over the weekend, with 85Rb on FC6. Not a lot of current, but pretty good for a first pass. More development today. Source settings shown below. As previously noted, the 2.5mm slits are selected. Also, the present IOS tune is for effect, not by the book.

Next up: Try some variations on the source setup.

MWS source switchover yesterday was successful. Leakchecking went well. A small leak on the intermediate section sealed with a snug on the two bellows fixing bolts. The microwave window required cleaning. It tested leak-tight. All good. Pumpdown curve to come. Meanwhile, source was restarted last night. First 85Rb is on FC6 presently. Although OLIS has run Rb beam in the past using the SIS, this is a milestone for the MWS. Development to proceed today.

Later... Here is the pumpdown curve to last night. Base pressure reached less than 3e-8Torr, which is a very good pressure for the MWS. Prepare to shut down leak detector, which has been pumping on the roughing line overnight.

Later... First piece of a comprehensive mass scan. Brings a tear to my eye. Save: 101029_1125.snapiosfc6

Later... Scans completed. Data file. Among other things, the following isotopes were observed:

A/q	Current	Isotopes
14	1.5e-09	14N
15	6.0e-11	15N
16	1.3e-08	16O
17	6.0e-10	17O
18	6.5e-09	H2O, 18O
19	1.7e-07	19F
20	1.3e-09	20Ne
21	7.0e-10	21Ne
22	1.4e-10	22Ne
28	4.2e-09	28Si
29	2.0e-09	29Si
30	4.2e-06	30Si, 60Ni+2
31	1.9e-08	31P
32	4.2e-07	32S
33	1.0e-09	33S
34	3.3e-09	34S
39	7.5e-10	39K
41	5.0e-11	41K
44	1.0e-10	44Ca
45	1.6e-10	45Sc, 90Zr+2
46	6.5e-08	92Mo+2
47	3.2e-10	47Ti
48	7.0e-10	48Ti
51	3.0e-10	51V
53	9.4e-10	53Cr
60	6.5e-11	60Ni
67	4.0e-10	67Zn
69	1.3e-10	69Ga
85	6.5e-10	85Rb
87	2.3e-10	87Rb

Spreadsheet
Scans Details

Attached is a separate scan in the region of 40 to 45, done in two directions. Data file (raw).

Leave 85Rb on FC6 for the weekend, or as long as it lasts! !1.3nA presently with 2.5mm slits in. I have increased the support gas flow slightly.

A controls issue with IOS:BIAS was found yesterday. Controls people resolved it today. MWS source was switched over and prepared for Rb beam. Leakchecking done: tight. Source should pump for a little while longer before energizing. At present, leak detector is attached to the IOS roughing line. Pic attached with IOS:BP1 alternately online and offline.

Note: Source gas hand valve is CLOSED.

A controls issue with IOS:BIAS was found yesterday. Controls people resolved it today. MWS source was switched over and prepared for Rb beam. Leakchecking done: tight. Source should pump for a little while longer before energizing. At present, leak detector is attached to the IOS roughing line.

Later... Noticed that MCIS:TP2 was tripped off. After a couple of tries, it restarted okay. Hmm...

The experiment ran overnight, smoothly, by the looks of it. Beam is on FC6 now, so they're likely done. EOB studies on Mg beam to commence shortly, with source teardown and switchover to Rb beam to follow..

Emittance scans in progress, first at as-delivered settings: 5mm slits. Save: 101027_1102>snapiosfc6

Emittance scans at 26Mg then 24Mg.

Next, go fishing for 85/87Rb in background. Not a lot of fish in this pond... Double-check tune at 24Mg: perfect.

Next up: comprehensive mass scan. Then most likely we will take down the source for clean-up and switchover to Rb beams. Abort due to technical difficulties.

Next up: I just noticed a readable beam at A/q=13.33. Well, that's odd. (We are running 40Ar support gas in the source.) Let's see if it's reproducible. Yep.

Now... IOS bias keeps tripping... Time to investigate... The FUG keeps blowing fuses on reset. But in local mode, it starts and runs just fine. We conclude that its CANBUS card is driving the FUG at full chat on reset. Anyway, F/R#4925.

The TIGRESS run was scheduled to end at 08:30, but has been extended for 24h. The ICR reports that they are getting "good data" with the present beam. Why mess with what works?

We will expect to begin the MWS switchover tomorrow.

Smooth delivery (from OLIS point-of-view) to TIGRESS over the weekend. An SCB RF amplifier failed yesterday and was replaced. Tuning was done. Source is stable.

There were a couple of bias sparks over the weekend, expected during Mg runs. The mag stability program got knocked off at some point. Restart OK.

A 26Mg beam was handed over to TIGRESS last evening. It is 26Mg6+ through ISAC-I and further stripped to 26Mg10+ by the time they get it. Approximately 2.5pnA at FC6.

The MWS was restarted yesterday, and a 26Mg beam re-established. ICR set up into ISAC-II overnight, and tuning to TIGRESS began this morning. Note the experiment change due to circumstances at the RIB targets.

MWS ran fine overnight. It was shut off this morning to investigate bias sparking issue, noted on FR#4894. The two MCIS turbopump controllers are displaying gibberish on their front panels this morning. There was one spark since yesterday, around 19:15 last evening. Due to a failure at ITW - see here and here, a proposal is made to deliver 26Mg to the experiment for data.

MWS operating nicely.

MWS is producing 26Mg, presently parked. It was used over the weekend for TUDA tuning.

Source is running nicely. Hand-off to ICR occurred ~Wednesday night. Setup done overnight. 26Mg (PE is now on at nominal value) is selected presently; blue trace on Stripchart.

Source conditioning most of today, to 59kV. Striptool attached. Reset to 26Mg tune at ~16:00.

Source switchover in progress on WP#2010-10-12-1. Magnesium material installed into MWS. Pumpdown in progress. Leakup rate OK. Turbos on.

Later... Pumping going well. at 1e-6 by ~16:00.

Beam from MWS quietly sitting on FC6 awaiting tune checks to TIGRESS. Next experiments up are 26Alg5+ to TUDA and 24Na5+ to TIGRESS. So we are poised for source switchover to provide 24/26Mg pilot beams from the MWS.

A 20Ne1+ beam from the MWS was established on Friday. Line tuning began Friday evening. A tune to the front of the SC LINAC was in place by Saturday. Tuning through was delayed by SC tank conditioning.When the LINAC is ready, tuning to TIGRESS will resume, expected today.

The September Mini-Shutdown is now a memory. The few days available to OLIS were used for MCIS Development on 197Au. Productive. A 197Au34+ beam sat on FC6 overnight. The program ended Friday, at which point a 20Ne1+ beam from the MWS was established, and line tuning commenced.

Supernanogan on overnight, in the search for gold. A trace of 197Au34 observed this morning. Development continues.

A/q: 5.7941

FC6: ~500epA

Bias: 10,876V

EL: 4274V

Sputter source bias: 1262V

RF frequency: 13.60175 GHz

RF amplitude: 10dB (~16W FP)

MCIS:IG1: 6.8e-8 Torr

DRAGON continues to take MWS beam.

Later... 14:00 EOB. Prepare for Mini-Shutdown.

MCIS Development finished Friday evening. OLIS switched to MWS operation and setup began for 4He1+ delivery to DRAGON. Beam handed over to experiment last night.

Today's agenda: RF frequency scans and generally getting a feel for the new sputter source.

Mass scan plots in region of 197Au25+ attached below, taken with and without the sputter source on. Matlab post-processed pics to come shortly.

A new sputter source was installed onto the Supernanogan. A wire of Au is installed in the source. Mass scans this morning with source at equipotential. Source patched to MWS EE supply and biased to ~1kV tunable. That makes a significant improvement in intensity. Beam at FC6 is 197Au24+ presently.

The 16O3+ DRAGON run just finished. MCIS Development begins this morning for a few days. The goal is to install and characterize the new sputter ion source.

Below are vacuum pics before and after closing MCIS:IV0. There was a bit of a spike during closing. All three turbos switched off. TP3 is down now.

Later... Keerthi requests we look at 16O7+ production as a measure of source performance. Done. Chart appended below, with source panels. Mass scan next.

MWS is running nicely. SCC development continues. This is scheduled to end on this coming Tuesday morning. It will likely continue for a couple of days, after which there would be a beam switch to 16O2+ from the MWS for TUDA-II setup.

Beam used into last evening, then idle overnight. Nice and stable. Maintenance Day for the cyclotron and ISAC.

Beam idle overnight, and grew nicely. Source tweaked up and throttled back a little while ago. SCC development expected to continue today.

We have a request for changing over the source to 4He1+ operation from the MWS.

Later... OLIS opened. Canister purged with N2 and pumped via IOS, then valved off and disconnected. ICR has restored a recent 4He1+ tune.

Beam ran quietly over the weekend, with the anticipated intensity drop-off. Source gas canister at ~15"Hg and IOS at 3.3e-7 presently. Several DRAGON energy changes were done as planned.

Later... at ~09:45 DRAGON is done.

First beam appearing on FC6 presently, after the source pumped overnight. Source gas valving set up earlier this morning.

Later... We have a whopping 5nA of 35Cl1+. We expect orders of magnitude more. Mass scans and investigation in progress.

Later... Another scan after some source gas changes. Much better. 35Cl+1 = 575nA 35Cl+2 = 3.5pnA with 1mm slits.

Neon support gas hand valve is closed. Source wuill require expert intervention to reignite, if there is a power bump, etc.

Later... Final tweaking done. ~10enA on FC6 with 1mm slits in, and ~23enA with 2.5mm slits in. A Stripchart of the last little while, plus present IOS tune and skimmers. Hand over to ICR at 13:25.

OLIS off Wednesday morning for source changeover from 16O3+ to 35Cl2+. We have elected to use the MWS for this run. Supernanogan is removed from OLIS and parked at its service dock. Lots of leakchecking done on both sources. Both sources are under high vacuum presently and improving. MWS will be ready to start in the morning.

Delivery of 16O3+ for TIGRESS "buddy beam" purposes ended early Tuesday morning, followed by CSB setup as an ion source Tuesday day. MWS behaved very nicely. Beam off Wednesday morning for switchover.

Beam idle for most of the weekend. Some ion source ups and downs, in part due to a WFB setting on the edge. Tuning began last evening. Some funny business overnight with apparently disappearing and returning beam.

Supernanogan is online. Setup done last night. There is room for tweaking, but stable 3enA on FC6 of 16O3+ presently. We'll see if ICR has room for tweaking before handover to users. Yes, we have clearance.

MCIS RF scan in progress.

MCIS vacuum: 8.17e-8 Torr

IOS vacuum: 3.15e-7 Torr

Later... No-one has called so far for the beam, but they can have it anytime. Right now, about 15enA on FC6 with an RF frequency that is midway between lots of current and ruler-flat stability. There are other choices too.

So... the long-awaited word to switch OLIS beams and sources finally came through... at 17:45. Luverly. Anyway, we're on it. Basic idea: 4He1+/MWS -> 16O3+/MCIS. Users only care about A/q being as close to 72/13 as possible using standard beams. Last moments of 4He beam shown below. MWS is running very nicely.

Later... Supernanogan is up and delivering 16O3+. Note that MWS solenoid valves and flow controller are just so for this to be possible. Leave them alone.

Beam in use intermittently.

Source switchover went quite well yesterday morning. About 6nA of beam on FC6. Beam idle overnight. Tuning has resumed now.

Today we switch from 74Ge1+ to 4He1+, about as wide a switch as we've done at OLIS. We will use the MWS for the 4He.

Later... sources lit. First mass scan attached. Intensity is pretty low for now.

Later... MWS optimized better. Optimal He gas pressure is somewhere between zero and the leakthrough rate on the flow controller set at zero. Stripchart attached. ICR will play with source and beam as it is for now.

Later... ICR has found a few enA in there, and vested parties are happy with the beam.

Beam is sitting on FC6 presently. Good source operation over the weekend. Some pics to come. RIB delivery to TITAN ended at 08:30 this morning. OLIS is scheduled for a beam switch tomorrow morning.

Later... A power bump knocked us out cold again. It appears that the Safety Enable bit was lost.

Beam remained on FC6 overnight. Beam was used for a tune check this morning. At noon today beam was switched to 4He.

Later... Outcome of 4He development with Supernanogan: beam comes with other isotopes. e.g. 12C3+ and 16O4+. Verdict: 4He1+ beam is better produced with the MWS.

Later... By request, set up source for 74Ge beam again. ~30pA on FC6 by ~midnight.

The Supernanogan is producing 74Ge using the heater source, a first for the Supernanogan. Development done over the last couple of days and completed yesterday. Tuning using mass 76 (76Ge or 76Se?) was done last night. Energy is set at 12.24kV, same as previous 12C2+ run. Beam is being used as TITAN pilot beam for their 74Kr run.

Our work permit to leakcheck the Supernanogan and IOS was signed this morning. The source is off presently, and work is underway. The 12C2+ beam was not used overnight.

Beam from the Supernanogan remains on standby for TIGRESS pilot beam. There were a couple of source trips over the weekend, at least one a consequence of a power bump that took out a few other things too.

We have had a couple of pending work permits in the queue for a while. One is for germanium beam development, and one is for OLIS leak checking. The benefit of carrying out this work is assured delivery of 74Ge for the upcoming TITAN run, rescheduled to begin Wednesday. Note that if a leak is found and repaired on the Supernanogan side, there will be a minimum of three days pumping required before sufficient vacuum will be achieved to generate multi-charge ions.

Tuning to TIGRESS is continuing. There is a full expectation that they will take RIB over the weekend.

As it stands, the beam schedule shows switchover from TIGRESS to TITAN on Sunday evening. For a couple of reasons, it would make sense to move that time into Monday or so.

OLIS is set up for 12C2+ delivery, with about 13enA on FC6 from the Supernanogan source presently. Beam was reasonably stable overnight, and should condition out better over time as well. Initial tuning into ISAC-I is planned to begin this morning.

A source switchover day was negotiated, with a goal to provide 12C2+ beam. As a practical matter, it's been an OLIS Maintenance Day, at least for the morning. Controls installed a cable to provide remote reset capability for the OLIS Enable interlock panel. However, it did not perform as expected first time, so Controls has elected to pursue this another time. Meanwhile, the remote cable is at the rear of the OLIS Enable panel, ready to be connected next time.

This morning, Keerthi started the Supernanogan, and established (evidence of) initial 12C2+ and 74Gen+ beams from it. Maintenance concluded around noon, and beam development resumed. Goals: Find clear 74Ge and 12C2+ peaks.

Beam used sporadically over the weekend. Note temperature response in beam. A power bump occurred at about 10:00, knocking out OLIS. It was challenging to come back to where it was before.

Source drifted overnight. Operators made a slight correction to silence an alarm. I have tweaked this up. Shown below are before and after. Marco believes present beam is unstable. I will see if I can tweak up the intensity, and perhaps that will satisfy all requirements.

Later... ~13:00 this is just about as good as it gets. Stripchart of the last couple of hours plus current excellent source parameters appended below.

Beam idle overnight. Source conditioned and changed a bit. Slight tweaking required to bring it back to stable.

A 16O1+ beam from the MWS is being used for SCC development and commissioning by agreement. Some sideshows getting there.

Later... At approximately 13:15, some event, a bias spark, it appears, took out a number of devices, most of which IOPS reset. The FUG blew a fuse on startup. Replacement OK. However, there remains an interlock light on the IOS:BIAS panel with no apparently unsatisfied interlocks showing. Controls is checking now (~15:00). Cause appeared to be an old version of a startup script on IOSIOC. The script has been updated so that this particular fault should not recur. Source restarted okay, but it took some doing to get the separator magnet back. It is still not optimized, but Marco can take it from here.

Source pulled down for Mg removal and cleanup. Done. Supernanogan refurbishing of MCIS optics complete, plus a comple of other items. Opened joints leackchecked and okay. MCISIOC was in a partial state, where devices worked but not interlocks. It turns out that Controls knows about this. Msg to investigate in the morning. Meanwhile, MWS is up with a 16O1+ beam on FC6 presently. FYI, the vacuum pumpdown curve during leakcheck and startup operations.

Photo-finish for TIGRESS this morning, apart from a cavity trip at around 6:00 a.m.. The MWS is running very well. Some EOB activities underway presently.

Plan for today: MWS pulldown for Mg removal and cleanup. If feasible, we will install the Supernanogan into the OLIS cage as well.

Beam was switched from 24Mg5+ to 26Mg6+ on Canada Day. Also, the source blinked out on Saturday. Remote restart okay. Source is running well.

Supernanogan maintenance continues. MCIS optics module was reassembled last week and installed this morning. Also a section of wveguide was replaced using a specially prepared section. TBD: MCIS:DB1 top place assembly, pump, then reinstall the cart into the cage if possible.

Later... solid target chamber installed with germanium powder, in preparation for an upcoming run. MCIS:DB1 is assembled. Volume is under high vacuum now. Leak detector also set up in preparation for checking tomorrow.

Delivery / standby continues.

Delivery to TIGRESS has begun. Beam from the source looks perfect. Looks like happy times for them. The plan is to eventually deliver 24Na5+ via the CSB. Maintenance Day for the radioactive lines is in progress now.

Later... This is about as good as it gets for magnesium beams from the MWS. Attached are screen shots of the source setup.

Delivery looks like it was pretty smooth over the weekend. TIGRESS expects to receive 24Na from ITW via the CSB this week. Yield goes today.

Tuning into ISAC-II was done yesterday, and continues today. The source was idle overnight. There were a couple of magnesium hiccups. Beam is looking fine right now.

Mass change yesterday morning from 26Mg1+ to 24Mg1+ from the MWS. It was tough to get stable beam from the source, and there are signs of Mg plating out on stuff. Keerthi was here last evening and again overnight to open the source and clean it up. Good job.

Later... There were a couple of power bumps over the lunch hour. One took out OLIS, the other didn't. Yes, the IOS Enable panel had to get a local reset yet again. I have an ECR submitted to Controls for UPS support on the 24V power supply that feeds it. Source restarted reasonably okay.

Beam was redirected to TIGRESS yesterday. RIB delivery to TIDA-II was rendered impossible due to a failure in the target or module. We have a verbal request in place now to change mass from 26Mg1+ to 24Mg1+. Attached is a plot of beam overnight on FC6 prior to changeover.

Beam waiting quietly on FC6. There was a power bump on Friday just after noon that tripped the world. Keerthi restarted OLIS. Beam never really came back to its former glory. We'll see if there might be an opportunity to touch it up.

Later... Mag stability program reset required. Internal field probe is at its limit. Hmmm... Meanwhile, revert to EPICS field probe, which unfortunately is not temperature-compensated.

TUDA-II began taking beam around midnight last night. Beam on FC6 for a good part of the night. Steady as she goes.

Beam idle overnight. Beam is being used as a pilot beam for this run. Source was knocked off by a power bump on Monday evening. Signs are that the root cause is the same as last time, loss of 24V to the IOS interlock panel.

On Saturday we opened the MWS and set it up for Mg operation. Everything went well. We are using the pair of half-moon Mg metal plates together with a thin Mg foil liner inside a bottomless quartz liner. Tune setup for HEBT/SEBT operation set up yesterday. 26Mg is selected. MCOL3A/B tuning for true centre is in progress right now while there is opportunity.

After EOB activities from 15N4+ run that ended this morning, we have begun preparations to switch over the ion sources. Turbos off just after 11:00. We have Mg source material ready. We will be using the MWS ion source. Due to the requirement to run the source at 53kV, we will also remove the Supernanogan cart from the cage as a sparking precaution.

Later... MWS backplate removed and reworked for Mg operation. Buttoned up and under high vacuum again now. Currently 2.5e-6 Torr at ~14:00.

Later... Plasma is lit. 24Mg begins to be visible after a while.

Note: Supernanogan cart is in its service dock.

Delivery to TIGRESS ended this morning as scheduled. ICR took nice emittance scans and is completing a target snapshot now. Canister still at -22"Hg and MCIS at 7.3e-8 Torr.

Chance to snap some wirescans. Attached.

Delivery of 15N4+ to TIGRESS continues. Source gas canister is still at ~-22"Hg, and MCIS pressure is 7.2e-8 Torr. ICR reported intensity drops a couple of times this morning. The attached Stripchart suggests beam from the source is down to about a third from status quo. We will look into it now.

Delivery to TIGRESS began yesterday or so. ICR reported beam intensity drops overnight. I'll look at it presently. Meanwhile, canister pressure is still ~-22"Hg and MCIS pressure is 7.09e-8 Torr.

Later... Check source at request of ICR. It looks mighty fine. Slight tweaks on RF, but really no great change. FC6 was and is 200enA, though it was around 80enA this morning.

Setup into ISAC-II began last night. Tuning is in progress now. Beam on FC6 overnight. Canister pressure is -22"Hg and MCIS pressure=7.1e-8 Torr. Pressure showed correlation with temperature. It is overcast today and cool, suggesting a fairly flat response today.

User tuning began Sunday night. Beam physics expert chose to retire the IOS:Q1 defeat, as he did not know until yesterday that it existed. He discovered it after attempting to retune yesterday around noon from scratch and making a mess, notwithstanding Keerthi's clear instruction to leave it alone. He also does not know that Rick developed a tune for this, which provides cleaner transmission than the "book" tune. Pity. Presently there are some 75enA of beam at FC6. That should be enough. Note that there were some 90enA with the "defeat" tune in place, prior to changing the IOS tune. Canister is at ~-22"Hg, and MCIS pressure at ~7.0e-8 Torr at ~09:00.. ICR is tuning through presently.

Keerthi set up the Supernanogan for 15N operation and destined for TIGRESS, using two source gas options: a miniature bottle of enriched 15N2 and a canister with a charge of research-grade 14N2. The canister is similar to the one we used for the 33S run to DRAGON, which finished Saturday morning. Canister is at -22"Hg and MCIS at 7.27e-8 Torr. A couple of beam stability tests were conducted at 15N4+ and 15N6+. Bob can choose which one he prefers to use. 15N4+ is selected and tuned through IOS up to the RFQ presently (~10:30 am).

Later... Bob reported at the Beam Delivery meeting that the 33S6+ beam was a very nice beam. We appreciate hearing it.

Delivery of 33S6+ continues to DRAGON for the final day. Some online tuning of the line overnight. Source gas canister pressure remains at ~-20"Hg, and MCIS pressure is at 7.1e-8 Torr.

33S6+ delivery to DRAGON continues until Saturday morning. All the signs are that beam is excellent. Source gas canister is still at ~-20"Hg, and MCIS vacuum is at 7.0e-8 Torr.

33S6+ delivery to DRAGON continues. It is Maintenance Day for everybody else today. Source gas canister pressure = -20"Hg. MCIS pressure = 7.7e-8 Torr.

33S6+ delivery to DRAGON continues. Looks like there was an RF tweak overnight. Source gas canister still at ~-20"Hg. MCIS vacuum at 7.4e-8 Torr.

Delivery of 33S6+ to DRAGON continues. A couple of RF tweaks done over the weekend. Source gas canister pressure at -20"Hg. MCIS pressure at 7.3e-8 Torr. At this rate, we could deliver 33S until approximately forever.

Beam tuning in progress. Source gas canister at -20"Hg. MCIS pressure at 7.62e-8 Torr.

33S on FC6 overnight. Preparing to send beam to DRAGON now, and confirm isotope.

Source gas pressure gauge on canister = -20"Hg. MCIS pressure = 7.8e-8 Torr.

Some 3enA of beam on FC6 presently. Let it sit.

33S spectrum is saved as 33S_spectrum.dat 

after 24 hours background spectrum saved as "BackgroungNo33S003.dat"

RF Amplitude :7.767 , RFoutput power= 5W, Output power (dB)=36.4

after 24 hours background spectrum saved as "BackgroungNo33S002.dat"

RF Amplitude :1.553 , RFoutput power= 0, Output power (dB)=0  

Tried to see the background before 33S installation. Found few problems: MCIS:YCB1 does not hold more than 58V.

Very difficult to transport the beam without YCB1. Need to find a solution. Open and fix it is not an option even though we have a ready spare. It will take two weeks to get the vacuum back.

------------------------------

Outgoing TIGRESS experiment was the occasion for another ISAC milestone, 8MeV/u through the SCC for the first time just around midnight last Friday, May 21st. This also represented the first 8MeV/u beam to an experiment. And we can proudly say that OLIS beam was used. TIGRESS run ended at 08:30 as scheduled. Attached is a trar graph of beam on FC6, snapped periodically throughout the run. As before, you can see a small daily variation likely related to temperature of NA-LCW. There were reports of HPL tests this past Thursday and Friday. Evidently no effect over here.

ISAC-I tuning done yesterday. TBC today into ISAC-II. Beam very nice overnight.

Prepare to switch beam from 22Ne2+ to 20Ne1+. Skimmers from 22Ne2+ run shown below. Table of tune options below. We will be using the Rick Tune.

Device	Present Tune	Scaled	Scaled		Rick Tune	Scaled		Web Tune	Final
	22Ne2+	20Ne2+	20Ne1+		25Mg1+	20Ne1+		20Ne1+	20Ne1+
IOS:BIAS:VOL.VAL	22440	20400	40800		51000	40800		40800	40800
IOS:EE:VOL.VAL	1072	975	1949			3064		3064	1419
IOS:EESS:VOL.VAL	1810	1645	3290			0		0	0
IOS:XCB1:VOL.VAL	225	205	409			0		0	500
IOS:YCB1:VOL.VAL	268	244	487			0		0	140
IOS:CCB1:VOL.VAL	500	455	909			0		0	500
IOS:B1A:POS:VOL.VAL	3301	3001	6001			5693		5693	5933
IOS:B1A:NEG:VOL.VAL	3845	3496	6991			5693		5693	5933
IOS:XCB1AW:VOL.VAL	1658	1507	3014			4362		4362	3660
IOS:XCB1AE:VOL.VAL	2242	2038	4076			4362		4362	3660
IOS:YCB1A:VOL.VAL	412	375	749			0		0	340
IOS:Q1:POS:VOL.VAL	1215	1104	2208		-2425	-1940		0	1113
IOS:Q1:NEG:VOL.VAL	1215	1104	2208		-2425	-1940		0	1113
IOS:Q2:POS:VOL.VAL	148	134	269		-1115	-892		1428	892
IOS:Q2:NEG:VOL.VAL	148	134	269		-1115	-892		1428	892
IOS:Q3:POS:VOL.VAL	786	715	1429		0	0		2570	0
IOS:Q3:NEG:VOL.VAL	786	715	1429		0	0		2570	0
IOS:YCB3:VOL.VAL	397	361	721			0		0	500
IOS:MB:CUR.VAL	148	135	270			280		280	277
IOS:YCB4:VOL.VAL	316	287	575			0		0	470
IOS:CCB4:VOL.VAL	300	273	545			0		0	300
IOS:Q4:POS:VOL.VAL	1384	1258	2516		1333	1067		3392	1067
IOS:Q4:NEG:VOL.VAL	1384	1258	2516		1333	1067		3392	1067
IOS:Q5:POS:VOL.VAL	1254	1140	2280		0	0		2232	0
IOS:Q5:NEG:VOL.VAL	1254	1140	2280		0	0		2232	0
IOS:Q6:POS:VOL.VAL	0	0	0		3225	2580		0	2580
IOS:Q6:NEG:VOL.VAL	0	0	0		3225	2580		0	2580
IOS:YCB6:VOL.VAL	290	264	527			0		0	300

Saved tunes: 100518_1113.snapiosfc6 (strict) & 100518_1128.snapiosfc6 (tweaked). Emittance scan attached.

At noon, beam handed over to Sophia. She has questions about the defeats associated with the Q3 failure last year. Checking... done.

Summary of Q1/2/3 wiring status right now:

• Defeat remains on Q1.
• Q1+/- cables swapped at power supplies.
• Q2 output is normal (+ drives L/R and - drives T/B) and is opposite to Q1 and Q3.
• Q3 output is normal (+ drives T/B and - drives L/R).
• All wiring at DBs is normal.

Sophia is continuing her tuning using IOS tune as provided.

Later... Sophia reports that this beam transports nicely. That said, the IOS tune is a little different now. Compare attached below.

EOB for SEBT1 run at 08:30, taking 11Li from ITE and 22Ne2+ from OLIS when needed. Attempted emittance scans last evening, but no data showed, and no more time to investigate. So be it. Another time.

Last day of this pilot beam to TUDA-II. Expect a beam switch tomorrow for sake of TIGRESS.

Attached is Stripchart of weekend beam operation. Pretty nice indeed. Top trace (red) is Q3 skimmer, representative of total beam out of the source  Blue trace is 22Ne2+ on FC6 with magnet field stabilization program active. Brown trace is NA-LCW temperature as measured at exit of Supernanogan plasma chamber. Note an inverse trend against ambient temperature. Something to investigate at some point.

MWS continues to provide 22Ne2+ for pilot beam use. Beam quietly sitting on FC6. Stripchart attached. Also, Supernanogan plasma is on at low RF power for conditioning.

Beam continues to be reserved for E1147 pilot beam use. Beam was nice and stable overnight, as expected. Beam (blue) followed source (red), independently of ambient temperature, roughly reflected in the nearby Supernanogan plasma chamber temperature (maroon).

Later... at 10:14 today there was a sitewide power bump due to an HPL test. It tripped the cyclotron and one isolated ISAC ion gauge. The ICR operators saw the bump in the lights. OLIS went through it transparently, a fruit of a Maintenance a few weeks back.

Later... at around 17:00 I started the Supernanogan plasma. It is at low RF power for conditioning. HV is off.Gate valve into IOS remains closed.

Back to pilot beam status as of around 18:00 last night. A couple of sideshows through the evening. ICR made an elog entry about the IOS:MB field stability program here. But the information shown is inconclusive. As noted in a work permit, Magstab is in fact using our own Hall probe for reference. Unlike the EPICS Hall probe, ours is temperature-compensated. So two outcomes are certain:

1. The EPICS field will vary substantially as ambient temperature changes throughout the day.

2. A/q will vary by a proportionate amount, because it uses the EPICS field value in its calculation.

During the day today, ISACEPICS1 went down for a while, as seen in the attached Stripchart. On that same chart, you can also see the real stability of the separated beam. It varies directly as a function of the source itself, visible in the Q3 skimmer.

Later... Stability program is following source just about perfectly. Updated Stripchart (blue = FC6, red = Q3 skimmer) attached.

Leak checking on the Supernanogan continues today. We are preparing for an up-coming 33S run, for which we want "perfect" vacuum. We're close.

Later... MCIS backing line is now running on leak detector only. Calibration in progress... Done.

There was a short MCIS vacuum excursion at ~09:15. There were two similar ones overnight. Probable cause: sealant outgassing.

Later... MCIS leakcheck tested excellent. Our fix was good, and there were no signs of a leak after all in the bellows area. We are good to go.

Next item: IOS leakcheck if possible. At somepoint we also want to test out the solid target tube on the MCIS plasma chamber.

Later... IOS leakcheck in progress. Leak found at water feedthroughs on DB3 and touched up with same sealant as above. Sealed. Continuing down the line...

Later... We determined a small leak on the top flange of IOS:DB6, which we were able to help from outside. We also observed a significant gas loading from downstream of IOS:IV7. It is indeterminate at this time whether or not there is a specific leak. However, we also observed a fairly high pressure downstream of ILE:IV6. Closing that valve, however, had no effect at IOS.

At about 16:45, Colin requested beam for an energy check. We are doing a last leakcheck between IOS:MB and IOS:IV7 before we close it down and prepare for beam.

At 1about 17:15, MWS lit. >2enA of 22Ne2+ on FC6.

By agreement, the source came down this morning for continuing Supernanogan development. Main event: leak detecting.

Later... Robert and Tim lead leak detectors. Synopsis: A minute leak at waveguide flange on plasma chamber. We decided to seal it with a drop of vacuum sealant. Worked like a jet. Once Supernanogan beams are done for this beam schedule, we will remove the waveguide and re-machine and weld the flange. We also believe there is a minute leak at the bellows joining MCIS and IOS. TBC.

Supernanogan development, mainly for the sake of the upcoming 33S run, took place for a little while on Friday. It was expected to go through tomorrow (Tuesday), but we got the call for beam on Friday evening just before the Canucks game started. So it's up again. The beam was used for a while on Sunday to check beam energy.

Supernanogan development for 33S started. All MW and MW and MCIS power sypplies are off.

Gas for microwave source also closed from hand valve

Later... separator field stability development. Local Hall probe is online. Let it cook.

Beam from MWS remains quietly sitting on FC6, on standby for pilot beam use to SEBT1. The cyclotron is still down with cryogenerator issues. Latest prediction is first protons this evening.

Beam on standby for pilot beam. Cyclotron is still down with vacuum troubles since ~03:00, so no RIB to ISAC.

Beam from MWS continues for pilot beam use into SEBT1. There are cyclotron issues with cryogenics, so 11Li delivery from ITE is suspended temporarily.

Later... we purchased a small UPS for the MCISRFIOC server. It arrived yesterday. After overnight charging, we installed it today. This is in response to the hardware failure a couple of weeks ago.

Beam was switched on Friday morning from 16O1+ to 22Ne2+. This time it's a pilot beam for a 11Li experiment.

Mid-morning the source was switched over from 16O1+ to 22Ne2+ operation for a new experiment. OLIS will be used as the pilot beam during this 11Li run to SEBT1/TUDA-II.

Delivery to S1151 went quietly overnight for their last few hours. The run ended at ~08:30 as scheduled. Marco and ICR did some EOB checks. Also, a quick EOB emittance scan is attached. There were problems with the beam tune save files, since resolved. Among the last ones are 100430_0918.snapiossebt2 (missing SEBT optics) and 100429_2023.snapiossebt2.

Another quiet night of beam to S1151.

Beam delivery continued nicely through the night.

Yesterday Controls repaired and reinstalled the MCISRFIOC computer. It is working well. More details to come.

Nominal beam operation to SEBT2 overnight. A chart of beam over the last few days is attached. There is a step change in the separator field right around midnight. Although the archive does not show it, in fact this was adjusted at 23:54 last night.

Later...MCISRFIOC PC up again, with many thanks to Shawn @ Controls. The black MCISRFIOC computer, atop of the IOS racks, was found to be dead a few days ago. We originally thought that this was a consequence of last Monday's power bump. However, the attached archive plot suggests that it in fact failed on April 21st. Controls confirmed extensive hardware damage, and rebuilt the machine. It is up again now, and operational as it was before. I ran the MCIS RF and did an RF scan for good measure. It all works.

Our first experiment of the year started right around midnight last night, after extensive tuning. As I understand it, S1151 will confirm the age of the universe. The MWS source performed flawlessly over the weekend.

Marco and experimenters are busy at it, tuning the DTL. Regarding the source, he is "happy as always!" Well, that makes at least two of us. After this segment of tuning is complete, then he will move on to setup for the upcoming S1151 run at SEBT2 on Sunday.

Accelerator development continued this morning. Beam from source was reported to be "good". ICR showed me their long-term Stripchart of our beam. There is a clear daily correlation of beam intensity with weather. Interesting. Beam idle on FC6 since ~lunchtime. I took the opportunity to do a little magstab development. The server now runs Konstantin's ser2net patch which fixes the USB port name assignments at boot time. This is a common issue in linuxland, it turns out.

Beam up as of last evening. Controls performed some network upgrades today, which impacted beam operations. One glitch on our side: OLIS:MB drive bit was lost. Fault report. Otherwise, all's right with the world, and Sophia has resumed accelerator development.

Maintenance Day for OLIS started late yesterday afternoon. Source up at end of the day. See attached Stripchart and in particular how the source (blue trace is beam at FC6) came back to its nominal state within a reasonable time. Maintenance TBC after lunch.

Later... Hardware maintenance complete. Source HV and source gas tests followed by source startup around 16:30. Next up: magstab development.

Later... Magstab development done for this set. System up and ready for accelerator commissioning and development in the morning. Attached: starting mag field plus a Stripchart of the day.

Just in: an active work permit for OLIS maintenance. Underway through tomorrow (Tuesday) evening.

Save: 100416_2339.snapiosvault

Later... done for today. Source is on for the night.

Development on Friday; idle over the weekend. Stripchart attached.

Meanwhile, there was a power bump at around 09:30, and the source went out. Restarted OK.

Beam development through accelerators continues today. Beam was rock-stable overnight.

Yesterday's RF troubles in ISAC-I are reportedly solved. Beam development is expected to resume this morning.

Beam reserved for continuing accelerator development, but there are some ISAC-I RF phase troubles. However, maintenance was not permitted today... until just now. Too late for today.

Accelerator commissioning has resumed for the day. Beam was nice and stable overnight. See attached Stripchart.

Beam was used last week for DRAGON commissioning. Successful run, completed yesterday, as reported by Colin this morning.

Milestone: First coasting beam through new SCC on Thursday, 8-Apr-2010 at ~20:00, using 16O(1+)4+ at 1.5MeV/u from MWS.

This week's agenda: ISAC-II commissioning and development. Maintenance Day either Tuesday or Wednesday.

Later... Marco has been tuning most of the day. He is done for now. I am taking the opportunity to work with the OLIS separator field stability program. It has been offline since at least last week, and no action taken. Attached are present state of things.

Beam idle overnight. Another night of super-stable beam. If no users today, then we may take it for MRO.

Later... Check out magstab program while we have quiet time. Test outcomes when serial link is opened. Purpose: Improve fault tolerance. Done. Sophia will take the beam shortly.

Beam set up for accelerator commissioning. Sophia took beam yesterday. Beam idle overnight. Stripchart of overnight performance attached.

16O1+ beam requested yesterday. Source switched over and beam ready by evening. Nice overnight Stripchart, attached. Sophia has the beam now.

OLIS sprung a water leak last night. Problem was sparking through a coiled  cooling line. I replaced the pair of cooling lines and rerouted them somewhat. Source is up again now.

Beam idling overnight. Yesterday ICR called me regarding an IOSIOC reboot and consequent fallout. In short, it turned off IOS:MB. Not good. While the fix was easy enough, it took time to find it, which would translate to downtime during regular delivery. A lesson learned. I just noticed now that the magnet stability program was out of range and obviously had been since the IOC reboot. I reset the power supply and field. This procedure will need to be integrated into the ICR routines for IOS. Attached is a Stripchart over the period.

Beam stable as a rock overnight. Pity we have no-one using it at the moment! Stripchart attached.

Beam is on standby. Target snapshot in IOPS elog.  Over the last little while...

* IOS:IG1 repaired last evening. IOS vented to Ar, flowing for duration of repair. Standard Varian filament repair kit used with Dimo's instructions. Pumpdown and leak-up curve to be attached shortly.

* IOS:FC1 operation restored after cup was replaced during Shutdown. Being a safety cup, it required the air solenoid configured opposite to standard cups. Correct fix: Rotate solenoid 180*. Bias fails to come on automatically upon insertion. This is a completely separate fault, and likely predates cup replacement. Bias can still be switched on manually at any time.

* IOS:MB stability program was off during Shutdown and would not come back willingly. Investigated, and found blown fuse in output circuit. Fuses are 5A in a 4A circuit. Replace and go. Also added another ferrite core to serial cable between power supply and server.

* MCIS RF amplifier controls a week ago. For reasons yet unknown, the system lost its 2009 running configuration. Significant Controls work to restore. More work planned.

MWS is running well. Tune save: 100319_0901.snapiosdragon with beam observed to Prague magnet. Stripchart of last 24h attached.

20Ne1+ set up from the MWS and handed over to Sophia & Marco for accelerator recommissioning. Strip to 5+ at M:5. First day of beam. Happy St. Patrick's Day.

Later... a Stripchart of beam today: baby-blue trace is FC6. Also, here are screenshots of the source.

..................................................................................

Lots happened during OLIS Shutdown. In no particular order:

* DB1/3 optics refurbished.

* IOS:FC3 replaced.

* MWS refurbished.

* MWS microwave generator water interlock fixed.

* IOS:IG1 requires filament. Pending available window to vent.

* IOS:RP1 scroll pump refurbished. Base pressure <<14mTorr.

* IOS:MB vacuum box liners removed.

* IOS overpressure valve installed on DB6.

Cusp source water cooling (#4)  interlick does not work.

IOS:IG1 is faulty. Need to replac it during next earliest window.

Microwave source is up and running.

Supernanogan: grounding rod is stuck, RF generator does not clear the interlocks (controls?)

LEBT: FC3 air leak, in is out, out is in

Partial disassembly of DB1 optics today. Shielding of insulators is definitely working and indicated for unshielded insulators. Discussion of possibilities in progress. Wiring looks good, but one Kapton wire snapped at the connector upon disassembly (no force required).

More materials prepared for optics refit.

Preparations for rewiring the DB1/3 optics have begun. Sgan gas manifold work is in progress. Note: IOS:MP1 is scheduled for refit service shortly. We received major rebuild kits a few days ago, one to replace the kit used when the previous MP1 failed last fall. It is not likely this pump requires it; only the standard seal kit.

Supernanogan cart removed from Faraday cage to dock today. Some beam safety tests on FC6 in progress presently. FC3 was already removed for replacement.

Optics Photos: Lots taken; selected ones here as time permits.

3-Way Switch (DSCN7285.jpg & DSCN7286.jpg) looks pretty good. There is some discoloration on a downstream insulator, but far from worrisome. The elements hold HV just fine.

Q1 (DSCN7312.jpg& DSCN7316.jpg) looks good too. Insulators survived well. Note the interesting halo pattern on the backside of the downstream skimmer plate.

Q2 (DSCN7317.jpg) is in good condition with some plating on insulators.

Q3 (DSCN7330.jpg & DSCN7350.jpg) is complex. Some marked plating has occurred on a few of the insulators from the backside. There is an interesting deposit of metallic material, probably magnesium, on the backside of the downstream skimmer, right behind the quads. A similar depositing is also visible in last year's Shutdown photos. The water-cooled collimator in front of the quads has significant beam etching, which could have been present some time ago (cf. a year ago, DSCN6876.jpg).

OLIS Shutdown has been in progress for a week. IOS is vented, was swiped clean and opened. DB3 was craned out, a precision job. Note to whover reinstalls this box: Request Lu Sun to do it. He knows exactly how to tension the ropes so that the seals are not at risk of damage. Upstream optics in DB1 were also removed in the standard three sections. No problem removing them. Photos and commentary to follow. Bellows downstream and ahead of separator were removed, and separator box liners were removed. They had shifted since being installed, probably during pumpdown. The level of beam implantation was minimal, so the consensus is to leave them out altogether. This was a test running period for them anyway. Straight-through end flange was removed for this job, then restored again. Likely it will come off later for alignment checks. Inspection of the Y-box optics from DB1 viewpoint shows them to be in pretty good condition. Slight discoloration observed on downstream insulators, but all elements hold HV very well, so we will leave them alone.

Rough short-term schedule: Pull Sgan cart and move to its dock. Work on source gas panel. Refurbish IOS:DB1/3 optics over the next week. Then refurbish the MWS and restore its original source body and 2mm apertures.

We prepared stuff last night. This morning we vented IOS to argon, then swiped. Clean. Lu and Ajit craned out DB3 for us. Nice job, as usual. We will remove it and its neighbors to the ISIS Lab for refurbishing. OLIS Shutdown is scheduled to go until March 10th.

We ran 32S5+ overnight. Keerthi has been working with the new surface source oven for the last couple of weeks. His results to come. Meanwhile, here are a stripchart of overnight beam plus a few panels after my tweaking. Slits are at 5mm position.

Observations:

• The heater responds smoothly in 0.1A steps.
• There is an optimal heater setting; more is not necesaarily more.
• As always, there are several RF resonances within a range.
• Higher resonance produces more beam but less stable.
• Lower resonance produces less beam but more stable.
• Optimal heater loading technique and current setting will require further study.

Save: 100202_1000.snapiosfc6

Last stripchart is FC6 starting a couple of minutes before shutting off the heater.

Power down everything around 17:30, and turn off IOS turbos. I have left IOS:IV0 open to ensure the intermediate section gets vented before the cart is removed. I am leaving the MCIS turbos on for now,. to continue pumpimg residual sulphur.

Voltage              Current             MCIC:IG1

0                            0                       7.35e-8

0.3                        0.2                          "

1.6                        0.4                    9.1 e-8

1.6                        0.4                    7.79e-8 (5min later)

3.3                        0.6                    8.61e-8

3.3                        0.6                    8.98e-8 (5min later)

3.3                        0.6                    9.42e-8(10min later)   14.:36

3.3                        0.58                  7.89e-8                15:28pm

5.8(9.62RB)       0.8(0.48RB)     1.51e-7                 15:30pm

5.8 (9.62RB       0.78(0.47RB)   8.17e-8                 16:30pm

8.5V(14.15RB)  1.0(0.60RB)     9.5e-8)                  16.33pm

8.5V(14.15RB)   0.97)0.58RB)  8.52e-8                  16:45pm

11.6V(19.47RB) 1.20(0.72RB) 1.08e-7                  16:47pm

 15.2V(25.27RB) 1.4(0.83RB)  1.34e-7                   16:53

20.0V(33.02RB)  1.6A(0.96RB) 1.6e-7                    17:00

18.4V(30.52RB)  1.64A(0.98RB) 8.6e-8                  17:30

21.6V(35.92VRB) 1.8A(1.07RB)  9.42e-8                17:40

25.7V(42.73RB)   2.0A(1.21RB)   1.43e-7                17:50

23.6V(23.14RB)   2.02A(1.21RB) 7.7e-8                  20:20

Oven is off                                         7.62e-8              20:22

Beam is on for 8pi diagnosis by special request.

We set up beam in IOS yesterday. However, beam blinked out last evening, likely due to insufficient source gas pressure. Source restarted with just a little difficulty this morning. ICR adjusted downstream IOS optics to match into next section. Looking good, and they are tuning now, ~10:00 a.m.

Later... Save: 100114_1103.snapios8pi

Later... they found a problem with 8pi optics, a broken cable somewhere. They will resume testing with beam, once this is fixed.

Emittance scan of beam as delivered with ~1/2 uA of 20Ne1+ at FC6 with slits in at 1mm:

Later... They're done. ICR also tuned the line a little. Save: 100114_1533.snapios8pi

A stripchart of beam performance since we started this morning plus EOB emittance scans to follow.

We will be delivering a 28keV beam to the tuning boys tomorrow for further diagnosis of the 8pi line. In anticipation, I restarted the MWS with 20Ne1+ beam. With slits out, there are around 2uA on FC6. Emittance scan of current tune below.

Same tune again with slits in a 1mm, emittance scan attached.

Gas flow presently at 0.5ccm. I will lower it slightly, as IOS pressure is a little high.

Save: 100113_1830.snapiosfc6

OLIS was shut down over Christmas. We did a "soft start" of the MWS last Tuesday, after refurbishing and installation before Christmas. Worked like a jet.

Today: 4He2+ beam development + emittance scans. Here is the best so far.

FTR: Emittance scan is reverse-biased from external battery.

Welcome to 2010. Shutdown is underway across the site, while beam development is going on at OLIS.

The MWS stayed up flawlessly overnight. Beam grew from about 2µA to over 5µA this morning. Was it the pre-conditioning of the RF generator? We will look at the beam for a bit now, then shut it down for Christmas.

So... lots has happened.

* Supernanogan *

Heater components installed in plasma chamber. Cart reinstalled into Faraday cage. Scroll pump rebuilt! (Thanks, Dan and Edi!) Pumping started this morning.

* Microwave Source *

Wiring restored. Microwave backplate and components restored. Pumping started yesterday and at high vac now ~2e-7 Torr. We will make final inspections and tweaks, then prepare to start.

Later... Source started and first beam observed at ~15:00. Note: Since microwave generator has not been run for a number of months, we did a "soft start", warming up at a few watts at a time for several minutes at a time before going for the gusto. Emittance scans in progress. Done. Beam is a bit off-axis, but it's there. Let it cook for the night. Striptool running.

Keerthi and Marco achieved visible 4He2+ through the RFQ on Friday (or so). Mass spec attached. Development continues today.

Update: First visible A/q=2 beam through the RFQ at about 14:00 on Friday, December 18th, seen on M:5, an historic milestone for ISAC. Beam later observed on MEBT spectrometer around 16:00.

Yesterday: Busy! Source filment changed last night. Source pumped overnight. First start this morning.

Today: Busy! Nutshell: A/q=2 passed to Marco for isotope verification at MEBT.

Later ~16:00 Beam on MEBT:FC5, an historic first for achieving A/q = 2 through RFQ. 1.6enA of (likely) 4He2+. Tuning to FC7 continues.

Later ~16:50: Blips on FC7. Real? Stay tuned.

First emittance scan at 4kV taken and attached. It's rough but indicative.

Today we vary source gas pressure.

Later... Several iterations of pressure, tuning and standing on our heads. Representative emittance scans attached below. TBC tomorrow.

Four larger apertures were installed yesterday. This morning we fired up the modified source. It lit immediately. Plenty of beam. Development at 28kV, then scaled to 15kV. Beam intensities and ratios did not scale. Thesis: Space charge effects are too much for 15kV. Also, I3 accel-decel lens p/s needs work. We added a ballast to it today; p/s in tomorrow, then retest.

Development over the weekend. Results to come. Restart source now and let it warm up. 4He2+ on FC6. Plasma at zero, to duplicate weekend settings. Arc at 150V. FC6 ~=150enA and settling down presently, IG1 = 2e-7 Torr.

Later ~10:00: FC6 ~500enA. Mass scans next.

Later ~14:00: Some scans done. Outcomes to come. Meanwhile, Marco Lovera has manufactured a new aperture for the CUSP source frontplate. It has a larger diameter, therefore should allow a brighter, if more diffuse, beam out of the source. Preparations for venting and installation are in progress now.

Today we swapped power supplies between the arc and plasma electrode. This gives us a higher voltage range on the arc, at the possible expense of current limiting. We plan an extended round of development in this mode.

Source stayed up quietly overnight. Current dropped off gradually. I will tweak things shortly.

Beam tweaked up to 3eµA. Pressure is ~5e-7 Torr. Plan for today will include a rework of the arc and plasma power supply wiring to achieve higher V on arc and opposite polarity on plasma.

Later... First iteration of plasma polarity swap was a bust. The supply couldn't handle the back EMF or something, and the beam was unstable. Keerthi tweaked something... Now it's stable. Some measurements taken with varying the arc supply and tweaking the rest to follow. More of the same to come. Meanwhle, there are 6.5eµA of 4He2+ on FC6 presently.

CUSP source was off for the night, following Keerthi's development. He had increased the current on FC6 and the arc current substantially. More later.

Meanwhile, restart source and let it condition for a bit.

Later ~14:00 we have 200enA on FC6. Source gas is shut off presently. Time for some mass scans. Strategy: Identical mass scans without and with source gas, to check background ratios.

Later ~15:00: Mass scans with source gas closed complete. Note: IOS pressure is 5.25e-7 Torr, slightly higher than earlier. It was ~3e-7 this morning. Possible leak in gas manifold fitting?

Later ~16:30: Try out different combinations of gas and source parameters. We cannot get the gas flow low enough so far. Optimal source:

Fil = 130A (3.1V)

Arc = 67V (0.9A)

FC6 = 7.5eµA 4He2+ & H2

Note: Increasing any of these parameters much above these numbers causes the bias to current-limit at 1mA.

Later ~18:00: Check beam current at H+ and H3+:

FC3 = 140µA

FC6 = 1.42A at A/q = 1 i.e. H+

FC6 = 149enA at A/q = 3 i.e. H3+

FC6 = ~80µA at A/q = 4 i.e. 4He1+

FC6 = 1.78eµA at A/q = 16 i.e. O+

FC6 = 2.29A at A/q = 18 i.e. H2O

Plot 1: FC6 current for last evening.

Plot 2: Scan 0 to 5 and back.

Plot 3: Scan 0 to 40 (same parameters as yesterday).

Plot 4: Scan 0 to 40 and back.

Plot 5: Combo development session stripchart.

Fuse for FUG power supply obtained and installed. Source is up and warming up. ~100enA on FC6.

Later ~14:00: Tweak things up. We now have a more stable 380enA on FC6. IOS:IG1 = 7e-7 Torr.

Later ~15:15: Adjust source gas metering valve "just a little"... and effectively vent the tank. This needs work. Recover, restart source. Wait and watch how beam responds to gas pressure. See attached stripchart.

Later ~16:00: Increase arc power & filament current. Arc current jumps from <100mA to >3A. Also increased current load on bias & EE.

Arc = 135V @ 3.0A

Fil = 3.25V @ 138A

Bias = 28kV @ 788uA.

EE = 2.07kV @ 4.9mA

PE = 97V @ 149mA

Gas = 0.41ccm

First mass scan attached with arc current at 3A.

Second mass scan in progress

The OLIS cage was open over the weekend. IOS pressure is in the 4e-7 range, with source gas manifold closed and external helium bottle slightly opened through the metering valve. Today's game plan is being discussed presently.

Later ~11:00: Restart source. 50enA of A/q=2 at FC6. We had planned to restart with background source gas, but pressure is too low in gas lines, and a plasma is forming there. I have opened helium on gas manifold, with flow controller at zero SP. ~0.5ccm result. Background pressure ~4e-7 Torr; present pressure = ~1e-6 Torr.

Later ~15:00: Tweak source and IOS. Presently we have 0.5uA of A/q=2 on FC6. Big contributors: EE + vertical steering. Attached pic shows beam since ~startup this morning and a flurry of activity around midday. I will begin some source gas tests shortly.

Later... Source gas tests part one completed. Solenoid valve upstream of flow controller closed, then flow readback, pressure drop and FC^ noted until source gas line became a "neon" lamp. Part two barely begun, when FUG blew a fuse on normal startup and (how embarrassing) we don't have replacements handy. Also, upon opening the RG helium line, we found it was tricky to get a good pressure. We have it now. Fuse will have to wait until man~ana, though.

We received back the source this morning. First order of business was to take some EOB scans. See earlier entry. Then we shut down the source and opened the cage. Water leaks fixed. We had agreed with ICR to let them go for the sake of continuous beam to our users, so that we could avoid switching off the source. All done. There is a little weeping on one or two of the source body screws, as expected. As a practical matter, we aren't going to fix these.

Research-grade helium gas and lines hooked up today. Metering valve installed inline. Lines are pumping now. One-pass helium purge done.

Note: We had first beam today from the I3 development H- ion source, presently set up in the CRM on a borrowed test stand. Yes!

Mike declared successful EOB this morning. "Best beam I ever used" or something like that! EOB emittance and mass scans attached. Note that slits are at non-standard positions for 5mm gap.

Now we are going to open the source for some maintenance and continue 4He2+ development after that.

Beam was idle overnight. We took the beam for a while this morning, and ran a mass scan. We opted to not go into the cage to install helium gas lines or fix water lines, because it would mean switching off the source. So we will do the gas tomorrow or so, and fix the water leaks then too.

Note that the separator field is up about 4G from this morning.

The source ran well overnight and today. There is an issue with an ILE Faraday cup. Tuning is ended for today, and beam is on FC6.

By agreement, we are providing OLIS beam to the Beam Delivery group for the purpose of checking out transmission in the 8pi line. We have set up a 20Ne1+ beam at 28keV. There are some 3nA on FC6.

Here are optics numbers for IOS section:

Quad	    Rick's values	   Optimum values

Q1		1331V			1666V
Q2        	 661V			 580V  
Q3		   0V			   0V
Q4		 732V			 732V
Q5		   0V			   0V
Q6		1770V			1770V
Q7		 660V
Q8		 965V

An initial emittance scan is attached, raw and filtered. A higher resolution follows. Surprisingly, it is grainier than the earlier one. Slits are at 5mm setting.

Milestone note: The commencement of using this beam today at around 14:00 marks the first time in ISAC history that a filament ion source is used to deliver a beam to a user. Hooray!

The CUSP source ran well overnight, notwithstanding local control of source power supplies. Filament supply had dropped to 115A this morning, which is approximately 10A over a 16 hour period. Attached are charts of 4He2+ beam on FC6, an archive chart and a fast stripchart of the last six hours. Shortly we will begin setup for an 8pi shakedown run today.

OLIS beam to 8pi is planned for tomorrow. A 20Ne1+ beam of ~3nA at 28keV is the agreement. The 8pi line diagnosis is likely to take a couple or three days.

We completed the services by end of last week. Of course they could always be better, but everything is fine for this iteration. Keerthi had a first beam out of the source (to FC3) on Friday, with no source gas flowing. Today we started it up, and got first beam this morning. First 4He beam was observed on FC6 at around 10:45, and 4He2+ a few minutes later. Plenty of development to go, but it works.

We completed the services by end of last week. Of course they could always be better, but everything is fine for this iteration. Keerthi had a first beam out of the source (to FC3) on Friday, with no source gas flowing. Today we started it up, and got first beam this morning. First 4He beam was observed on FC6 at around 10:45, and 4He2+ a few minutes later. Plenty of development to go, but it works.

Later... Light it up and tweak. Filament is at 125A and arc at 100V. Bias is 10kV. 4He2+ on FC6 = 580enA. Save: 091130_1600.snapiocf6

Let it sit for a while. Filament p/s is running in local and V regulating mode for safety.

Latter... Stripchart attached of beam and playing over the last hour. It would be nice to have a loop adjusting the EL against SK-MSBR, which seems to track beam at FC6 quite well. Source on for the night to condition. ICR apprised.

Arc power supply replaced. Water leaks down to one or two pinholes on source body; manageable. Minor mechanical in progress.

Vacuum Group experts looked at IOS:BP1, reported noisy for a minute yesterday. Basically, keep a watch. It should be okay to Shutdown. We will order a seal kit and negotiate for a backup scroll pump.

Later... Electrical is complete and tested. Arc and filament power supplies run in local mode only, with insulated knob extenders through the cage wall. The source is ready for testing. As noted yesterday, source gas is off presently.

In a little while, I will secure and enable the cage and ask ICR to perform an IOSIOC reboot test for us.

Services completed today. There are still some teething pains, particularly the arc p/s as noted earlier. But we did have some beam on around noon for the first time, using neon source gas. Plan is to install helium source gas at the last minute, after all other checks, particularly leak checks, and a background calibration are done.

Later... IOS:BP1 made some clanking noises about a half hour ago, something like a car I used to own. Pump vacuum bumped at the time. See stripchart below. Quiet now, and pressure okay. ICR is keeping a watch.

Later... I closed off the source gas hand valve at 18:00 for the night, in case the scroll pump breaks and ICR has to shut down the turbos, etc.

Arc power supply does not hold any voltage.

Swiched off all the pumps and ion gauge for oven installation.

Keerthi found and fixed a couple more vacuum leaks last night. Present vacuum at IOS:IG1 = 4.4e-7 Torr. Electrical and water services installation in progress right now.

Later... Most of the services installed. Water tested: mostly OK, but persistent leaks on fiddly source body seals. Let Keerthi adjust these tomorrow. Power supplies wiring mostly done. A couple of source body connections await, plus primary power work by electricians. All in all, it's taking shape.

4He2+ "alpha" CUSP source under vacuum: IOS:IG1=7.3e-7 Torr. Electrical installations today.

I3 development source also at vacuum: 2.7e-6 Torr, which is better than when we started. TP gauge: 1.0e-7 Torr.

Later... Begin leak checking. Note: IOS:BP1 needs servicing. Its base pressure is ~30mT.

* Gas inlet on backplate already plugged off. Tighten. OK. Improvement in IOS:IG1.

 No other leaks found at this time.

Today we installed the CUSP "alpha" source on the MWS port at OLIS. It is vacuum-tight. Looking good. Also we installed remaining components on the prototype I3 source yesterday and pumped overnight. Vacuum there is good too. Next week is looking like a marathon source week. I also understand that a new target for ISAC tested well at the ISAC Test Stand today. A hat trick.

Pumps were switched off last night. IOS was vented to Ar and swiped clean this morning. MCIS ready for disembarking from F-cage. IOS:IV0 defeated so that we could vent the IM with IOS as one volume.

Later... Supernanogan cart is parked at its service dock. TP1 & 2 are up.

All turbos in the OLIS and MCIS are off. No controls for the MCIS. Pumps switched of by pulling the CG cable.

All the gate valves are off. All bypass are removed

After their EOB with 17O3+ yesterday, DRAGON switched to 21Ne4+ running for charge distribution studies. Keerthi changed over the source gases for that around 08:30 yesterday. Things went well. Beam intensity dropped off and leveled off overnight. I tweaked up the source just now. Current at H2:4 moved from xe-10 to ~1.5enA. A stripchart is attached. Orange trace is H2:4, and green is COL0, which reflects total beam from the source.

Later around 11:00... a controls event happened. Cleared all SPs, etc. Of course that turned off the source. Restart okay. 3.8enA on FC6. Beam observed to H:5 (energy change in progress). RF screenshot attached, and also what the Compare utility displays right now.

Later... around evening... DRAGON experimenters reported that delivered beam couldn't possibly be 21Ne, based on certain charge ratios they see and calculate. A couple of hours OTP with ICR to discern masses, in particular 20/21/22 series at +1 and +4 positions. We are pretty confident that 21Ne4+ (A/q=5.25) is sitting at ~1160G or so. Previous running had been at some 1170G, which we believe is the next peak up. (It later was found to be 16O3+, i.e. A/q=5.333.) Based on that setup, ICR attempted to get beam through the line. They got it as far as the front of the DTL, but that was it. Then they returned it to the higher field value and sent it through, but no joy for DRAGON.

Next day, Wednesday: Keerthi did careful mass scan and A/q re-calibration. Then Sophia looked at the situation. When she was done and the experimenters online by ~midday, the separator was reported sitting at 1160.75G. Separator field chart for the period is attached below; red is field, green is A/q. The run concluded uneventfully somewhere around 21:00 on Wednesday evening.

DRAGON declared EOB at around 08:00 today. Source and beam were switched to 21Ne4+ for calibration studies.

Beam and energy changes continued over the weekend. The ICR reports that things are going swimmingly, and that the users are happy. Scaler counts are up some 30% or so from Tuesday. All good. A source and line touch-up Wednesday (Remembrance Day) morning and a tuning effort following an energy change during the day on Wednesday produced strong and stable beam running.

Attached is a stripchart of the last day or so of running. The thick blue trace is the DRAGON scaler. The fine green trace is a source collimator, representative of total beam from the source and its stability. The spikes are periodic Faraday cup readings.

Beam ran well overnight. Last evening Vacuum Group diagnosed and repaired a catastrophic leak in the ILT cross region. You can see in the attached plot how venting that section caused elevated pressures in IOS, most likely due to the direction in which IOS:IV7 is installed. Most often it is the IOS section that is vented, and the neighbouring sections remain at high vacuum. So this gate valve would be installed looking downstream so that venting on the upstream side would tend to close the valve even harder. Yesterday was one of those rare times when the pressures were reversed, leaving only the spring tension of the valve maintaining vacuum in IOS. Pretty good, actually.

We are delivering a beam intensity exceeding the agreed rate. Intensity dropped off a little overnight, and it is pretty evident that it correlates with a higher vacuum in MCIS, suggesting that the 17O2 source gas flow has also dropped off. There is ample headroom presently, but the users may request a tweak after the energy change (in progress circa 09:00) and checks are complete.

Later... ICR requested a source tweak, which we did. A little increase.

Beam delivery continued through the weekend. As noted on Saturday, current dropped precipitously due to source gas pressure. We have 2.3e-6eµA this morning.

17O+3 at FC6 became 550nA.

17O hand valve found to be closed. Probable cause may be the cold weather.

After opening the valve beam came back. 2.6uA of 17+3 at FC6.

Notes by DMG 8-Nov-2009:

This valve is barely cracked. Temperature will affect it at such close settings.

Starting pressure Saturday when beam fell off: 4e-8 Torr.

Pressure today with strong beam: 6e-8 Torr.

Pressure during Saturday setup where beam began to quench: 8e-8 Torr.

Conclusion: Correct operating pressure range for Supernanogan source is tight. We removed the MWS head, anticipating this to be the case. It's so even when the slight extra pressure is entirely due to the source gas.

As noted, we handed over the beam to our users yesterday by noon. Setup to DRAGON is continuing. The report this morning that beam is great. Good.

Beam was quiet overnight. Keerthi touched up the tune this morning, and it is quieter yet and a little more of it too.

Later... Handover to Sophia occurred as scheduled. Save: 091105_1203.snapiosdragon

An IOSIOC reboot occurred sometime over the lunch hour. The usual suspects went down, plus the field stability correction power supply went to its lower limit. Reset this 'n' that and we're back. ~2e˜µA at FC6.

Later... Latest save: 091105_1449.snapiosdragon

Beam stayed up overnight nicely. Development today. RF scans in progress now.

Later... scanning done for the moment. Controls is looking at a PLC issue that has been on the books for a while. I have given the okay to turn on and off MCIS:IG1 at will.

Later aroun noon... We opened the cage and adjusted up the 17O2 flow slightly. Source is up and looking good. Optimize later.

Done for now. Some mass scans done. 1.2eµA at FC6.

Later... an initial emittance scan. Slits at 2.5mm.

Later... some tuning and another emittance scan. Slits at 5mm. 1.4eµA at FC6. EL deliberately low to balance skimmer spills. Save: 091104_1800.snapiosfc6

Let it cook for the night.

We completed 33S operation last night, and roughed in a setup for 17O. We had 17O3+ on FC6 overnight; chart attached. It grew nicely. Keerthi is working with the beam now.

As noted earlier, we have opened the OLIS cage and set up the source gases for 17O operation. It will take a while for the SO2 to pump away and for the 17O2 to equalize within the source body. Meanwhile, we have restarted the source with a preliminary 17O3+ beam on FC6. Without a doubt this will be unstable for a time, and the source may blink out also.

Beam came up nicely on  Friday, and stayed up quuietly over the weekend. Note the absence of periodic spikes in the separator field readback since the last IOC reboots.

Later... I have asked ICR to make us a nice emittance scan. (They are running beam at 8pi presently as well.)

Later... Well, nothing's ever simple. Eventually the emittance scan controls froze up, requiring an IOSIOC reboot. That of course zeroed optics. ICR recovered the beam. Attached is the final emittance scan. Slits are in at the 5mm positions.

That's it for 33S5+ development. I will switch off the source momentarily, and shut down the source gas supply.

Controls finished with IOSIOC work yesterday. ICR had restored most optics. I restarted the source last evening. As you can see below, the beam grew nicely overnight. Sometime today I will ask ICR to reboot IOSIOC and see if everything stays up now.

One more thing. The chart shows the last couple of days' running. Prior to beam-off for IOSIOC, we observed periodic spikes of about 45m each in the separator field readback. Now the readback is clean. We did not make any changes on our side. Only the IOSIOC work was done. Interesting, no?

Noon: ICR is rebooting IOSIOC right now. So far, normal whiteout plus MCIS optics is also white. CANbus page is also white, as I expect it to be.

12:15: IOSIOC is up, but 'most everything else is down. That's disappointing.

Later: Controls is looking into it. They have the optics for the afternoon. I will restart the source at the end of the day today.

Much later: Beam is on. ~3enA

Yesterday there was an IOSIOC reboot for a purpose. It was an opportunity to demonstrate to Controls that IOSIOC reboots materially affect the IOS section. Controls responded to an ICR fault report on it, and have not reported back to ICR so far. The source was off overnight and remains off now. I have informed ICR that if nothing happens this morning, I will restart the source after lunch.

Later... Jane reports that there was a problem, and it's been solved. We have to request that MCIS PVs get restored after a reboot. Done. Restart stuff. Much of IOS was already on.

Controls is rebooting IOSIOC. I have inserted MCIS:FC1 for the duration. Let's see what comes of it all.

Later... As expected, the reboot zeroed our optics. ICR issued a FR#4179 on it. Meanwhile, I rechecked the A/q calibration, and found it off a little. Below are before and after shots. The latter shows scanning in both directions. I didn't expect this large a hysteresis. On the other hand, the crossover points make nice reference points for known A/q values.

Later... Controls is investigating the FR! MCIS:FC0 in, and let them 'ave at 'er.

Beam was quiet overnight. I noticed a slow drift that seemed to follow the source pressure. My best guess is that our source gas "regulator" is a little coarse at these flows. Save: 091028_0935.snapiosfc6

I had optimized the RF yesterday, but the source went into a dual-mode toggling regime. It is hairline to find a nice point. I also found that it responds better if frequency is approached from high to low.

Later... After some tweaks earlier, beam is looking pretty good, a solid 3enA at FC6.

BTW, we are still running with the same SO2 gas settings as before, i.e. the calibrated leak valve just barely cracked open. Under the circumstances, it's a sweet spot for us.

Later... Another blip on the field probe at 16:15. Coincidentally the beam took a little hit. Here are the Stripcharts (tight zoom and normal zoom).

On Friday we left 33S5+ on FC6. The separator magnet power supply tripped at some point for unknown reason. The operators turned it on again overnight. Keerthi tweaked and tuned early this morning and just recently. Beam is back to FC6, but displayed A/q is off, though the actual beam is correct.

Beam stayed on quietly overnight, as did the separator stability program. Periodic pulsing continues to occur. No explanation has been proffered so far. Adding ferrite cores appeared to clamp the high spikes, but high spikes reappeared around midnight. There does not appear to be any real effect on the beam or separator.

The Supernanogan was on overnight quietly. FC6 went in this morning. (Didn't check if fingers were involved.) I  now notice a strange pulsing in our Stripchart. See what you think. Note: field and A/q max scales are orders of magnitude higher than real life.

Later...At around 14:00 I added ferrite cores to the field probe cable at the CANbus interface box. That clipped the high side of the pulses completely. If I play very carefully with the field range, I can get small artifact-looking pulses to appear since I installed them (see 17:16 chart). In the meantime, I found that, contrary to appearances, the field stability program was not really regulating. A remote reboot of the server cured it.

I alsmost want to write, see yesterday's entry! Source ran quietly with no interruptions. FTR, the separator stability program is also percolating along nicely. It was taking hits from nearby EMI until I added a ferrite split core to its USB cable at the computer end.

The source stayed up quietly overnight with about 4enA on FC6. Once in a while a little burp occurs, visible as small beam and vacuum spikes. I have tweaked the RF frequency up a little for better centre of range.

Switch on source for stats. Source lit up perfectly. Slight adjustment on RF frequency.

33S development is completed.  A 3nA of 33S+5 can be produced with 10W of RF power and 2.5mm aperture.

If more beam is needed apertures and the power must be increased.  There are some consequences for doing this.

MCIS optics and RF are off for the night.

Source started. 33S5+ beam on FC6 using gas flow determined yesterday. At first blush, it appears we need a slightly higher flow. But for now we will spend some time optimizing with what we have. We may open and adjust the flow later.

Later... This flow is okay for now. It requires a *really* fine control, which we do not have at present. 3enA with 10W of power. One source spark about a half hour ago. Mainly it knocked off the separator PS. Spill characteristics are slightly different also.

MCIS was running with background only. Prepare to open SO2 source gas...

MCIS:IG1 = 5.4e-8 Torr

TP1 = 13W

TP2 = 10W

Status: Leak valve closed, line valve open.

Bump leak valve carefully... but not carefully enough. Pressure bump, and back to 6e-8. I am using line valve as a needle valve. Pretty touchy, but it works.

 IOSIOC whiteouts and other funny things... I will ask assistance from ICR.

MCIS:IG1:= 7.4e-8 Torr with line valve barely cracked.

Well, it turns out that ICR is having trouble with other ion gauges in apparently unrelated sections. Interesting. Meanwhile, MCIS:IG1 trippd off and EPICS will not allow a reset. MCISIOC looks white... restart it.

Later... Controls + ICR have rebooted PLC1IOC and PLC2IOC, and perhaps others. Anyway, stuff is working again. Beam is on to MCIS:FC1 and IOS:FC3.

Later... Still no beam visible on FC6. But IG1 has crept up to ~2e-7 Torr. Open cage and adjust down. It's just about the smallest increment I can make, but it's a big step down. Meanwhile, The readback for IOS:MB field went crazy for a moment. I have it on a Stripchart, below.

Later... Liftoff. We now have 200epA on FC6 at 13.10GHz. Let it sit for a bit. Other possible resonances at 13.17, 13.24, 13.27, 13.34GHz.

The source is on. There is background beam on FC6 presently, less than yesterday. That's probably a good thing. Let it cook for a bit, then check the tune. Note: EL is off, as yesterday.

Keerthi has reinstalled the SO2 source gas bottle onto MCIS. Presently it is closed off to the source. We have restarted the plasma. Present goal: a good setup for 33S5+ with background levels (hopefully near zero) on FC6. Source pressure was 4.xe-8 Torr this morning, and has crept up to 5.0e-8 since we restarted the RF.

Later... We scaled a A/q=5.5 tune up to A/q=6.6 (33/5). Separator field = 1459.9G. Tuning in progress.

Later... First pass, shown below. Skimmers < 5uA. Snap: 091013_1651.snapiosfc6

Source switched off for the night.

MCIS:TP1 = 12W

MCIS:TP2 = 11W

IOS:IG4 reads 1.25 e-7 Torr and IOS:IG1 reads 9.8e-8 Torr with IOS:IV7 is open

IOS:IG4 reads 8.35 e-8 Torr and IOS:IG1 reads 7.49e-8 Torr with IOS:IV7 is closed

Neon leak close for upcoming 33S development.

MCIS TP3 foumd off by 1:00 pm.  Restarted without a problem

Before TP3 is on MCIS:IG1 is 5.47e-8 Torr.

After MCIS:TP3 = 5.21e-8 Torr

SO2 gas line is connected again. Leak hand valve is closed.

Intermediate section is pumping through source chamber.

CSB development is completed.

Friedhelm and Marco have requested 20Ne2+ from the Supernanogan, and plan to bring up the same from the CSB today. I am beginning MCIS bias conditioning. Goal: 24kV, maybe 25. Last save: 091008_0933.snapiosfc6

Later... Conditioning completed to 26kV. Set up a 20Ne2+ tune. It's largely a manual operation. Q3 off in keeping with the failure that occurred during the Mg run a while back.

Still later...We had a PV1 trip somewhere around 11am. That set us back apiece. Finally, done. Hand over to Sophia around 13:30. Snap: 091008_1325.snapiosfc6

Two notes to mention:

1. We fitted ferrite bead cores to all of the CANbus cables inside the IOS rack, as well as a couple at the Philtek separator power supply. We did this sequentially, observing CANbus cards on unfitted cards trip while the others stayed up, each time there was a significant bias spark. Right now the IOS CANbus diagnostics panel is all green, something I have not seen for a while.

2. As noted above, MCIS:PV1 tripped during our setup. We didn't notice until bias trips became unusually frequent without provocation. We happen to have been running emittance scans at the time, and could not account for an increasingly worse triangular shape to the emittance plot. Now we will recognize that shape as an indicator of a vacuum condition. I will paste them below later.

Today Supernanogan vacuum found to be down in the morning. Restarted easily.

Changed OLIS A/Q to 5 (20Ne+4) to satisfy the CSB and ISAC development changes. 8nA is sitting at the FC6

Over the weekend, Keerthi had set up 22Ne4+ to FC6 for the purpose of developing a tune matched with a similar tune from the CSB. However, yesterday it turned out that the CSB could not generate a 22Ne beam sufficiently bright for tuning. So the project was scrapped. Keerthi then changed the source for 20Ne4+ operation, and handed it over to Marco yesterday. I think that is going well. Here is a trar plot of overnight beam.

Supernanogan is ready with 22Ne+4 for upcoming CSB run. EL, HV and RF are on. The anlyzing magnet and the other optics are set for A/Q=5.5.

A 2nA of 22Ne+4 is sitting at the FC6. If require more current, increase the RF up to 25W or change the frequency to 13.256GHz.

A  1e-5 atm.cc/sec of 17O leak and a 1e-6 atm.cc/sec of neon leak are connected to the source through center tube of the RF transfer antenna.

Ne valve is open for upcoming CSB test.  17O valve is closed. All optics are set to A/Q=5.5.  RF, EL and HV are off for the weekend since no ISAC ops at night.

Beam is stable enough to let Marco set up something to DRAGON. We are a couple of days early.

Also, we tested the attenuators, previously noted to be operating oddly:

We are taking the opportunity to replace TP1 today. Edi Dalla Valle is on it. Also, Diagnostics has a WP in the queue for looking at the attenuators, so we have prepared IOS for venting.

Later... Cart was removed from cage for access. Pump was replaced successfully, and all volumes are under high vacuum now (17:00). In the end, IOS was not opened at this time.

A sustained 33S5+ beam was generated in the Supernanogan on Friday, September 25th. Attached is a trar plot.

Source gas: SO2 through either of two calibrated leaks: 10-4 and 10-5ccm.

FC6 = 1enA.

33S particle rate: 1e9Hz.

A/q = 6.6

Bias used = 13.881kV.

090916_1206ILTEMIT.txt

Graphics with "color" in the filename will look in print the same as "greyscale" files.

090916_1242ILTEMIT.txt  17O+5 has two peaks.

090916_1355ILTEMIT.txt  Repeat same measurement an hour later. (IOS bias was off in-between due to IOC/PLC reboots.)

090916_1222ILTEMIT.txt  Changed the MCIS steering to center the beam in the EL. 17O+3 ~5uA, 50x100

090916_1215ILTEMIT.txt    EL increased, ~4.5uA, emittance increases, 50x100   17O+3

090916_1156ILTEMIT.txt      17O+3  good settings 50x100 ,   333nA Scale, ~4uA

090916_1206ILTEMIT.txt      17O+3  good settings 100x200 ,   333nA Scale, ~4uA

0.4nA of 17O+8 is sitting on FC6. Development will continue tomorrow.

090915_1915ILTEMIT.txt = 17O +3,  4.4uA new tune, scanner offset +10V,  scanner scale 100nA , 100x50 matrix

090915_1929ILTEMIT.txt = same as above with 200x100 matrix

090915_1949ILTEMIT.txt = after tune tweaking (not optimal; for reference only)

Here are pix of the same scan: original, then greyscale, then cropped, using The GIMP. Not bad.

We noticed a double peak effect in the 16O3+ scan. I will set up the line for 17O3+ and see.

Scan #1: Double peak also visible.

Scan #2: Remove upstream slit altogether. Now profile is twice the size in the opposite direction of the double peak.

Scan #3: Widen emittance parameters in control panel.

Scan #4: Tweak MCIS CBs for FC0.

Scan #5: Optimize EL on FC6.

Scan #6: Lower EL by 10%.

Scan #7: Lower EL by another 20%.

Scan #8: Lower EL to 50% of full scale.

Scan #9: Tune for minimum spill with reasonable quantity on FC6. Save: 090915_1704.snapiosfc6

Final emittance rig control panel.

So. We are preparing for a few days of Supernanogan development. The present run plan is to obtain good emittance scans for higher charge states of 16O, 17O and 18. We may be limited by the loss of MCIS:TP1, but maybe not.

Set up on nom 18kV tune based on last recent save: 090831_1104.snapiosfc6. MCIS HV tickled up to prevent extracted beam surges.

First emittance scan of 16O3+ beam pix. First save: 090915_1053.snapiosfc6.

Also, here is a stripchart of the separator field and FC6 before and after the energy change. The field is nice and stable, and FC6 is consistent.

The DRAGON run ended uneventfully. (That's a good thing.) I ran a few emittance scans on the beam as-is. It is clearly monoisotopic. The shape is a little odd. Keerthi will comment on it in a while. Here are some pix. Below the emittance control panel are pix of the same beam at wider settings. Only the one 16O3+ peak is present. Finally, at the bottom is a pic of various parameters, the most important of which is COL0, which reflects the stability of the total beam from the source.

MCIS TP1 is not running well. Needs investigation as soon as S1219 is completed.

Later... TP1 failed completely, and we are running without it. Starting late Saturday night, DRAGON began to observe a certain instability. We correlated it to MCIS:COL0, which skims total current continuously. It is pretty evident that the source is now toggling between two adjacent plasma modes, due to the somewhat higher vacuum at MCIS. Vacuum was something in the 7-8e-8 Torr range before, but has settled out at some 1.25e-7 Torr now. General consensus is to continue running like this, as it is a minor effect, as you can see below (blue trace). DMG

I'm back from vacation. Physically, anyway. Keerthi did comprehensive emittance scans during Supernanogan Development over the last couple of weeks. He is very happy with the results so far. We are doing come post-analysis comparisons presently. Meanwhile, DRAGON is taking 16O3+. Some sideshows, including power bumps this morning which knocked out MCIS and many other systems. The mag stab facility was offline while I was away. I restarted it around noon. Some source tuning for current changes and stability from time to time, done by Keerthi.

We still have this water interlock issue on the IOS bias supply, preventing us from turning it on. I left a note about it before I left. Must follow that up tomorrow.

Later... Here are a couple of stripcharts of magstab performance, before and after the TP1 trip that occurred on Friday, September 11th, noted elsewhere. Spikes are DRAGON's automatic Faraday cup readings.

Another in the on-going saga of MCIS:PV1 trips occurred again this morning. The operators recovered most of the vacuum devices except for the IM section gate valves. We had an in-person discussion about them, the order in which they should be opened, and the existence of a hand valve in the IM roughing line. An ION note is needed.

Lots of other things were different, and beam was off. Restoring the tune basically restored beam. Whatever. Here are two emittance scans, one after restoration, one after further work. 18O4+ as before, but RF power arbitrary, and probably not identical to yesterday.

090818_0957ILTEMIT.txt

Ack! EL keeps tripping... Stay tuned.

Later... Jane is alpha-testing an application for our development. She is using the source presently. Development on hold.

High resolution zero to 25. Save file: masscorr_mcis_090817-highres.txt

Ack! Elog server went down at ~17:00!!!

18O4+ emittance scan at 22.44kV and slits open: 090817_1707ILTEMIT.txt

Note that in preparation for this scan I steered beam in X then in Y onto FC3 and FC6 respectively, looking for all beam through each slit. There was flat-topping evident in both directions for both cups. I would like to repeat the study for well-defined X beam through each slit by scanning with the 1mm slit and noting the drop-off at the tails. For what they're worth, I am appending the stripcharts for each cup. Data files are here:

mcis_strip_steering_fc3_090817.dat

mcis_strip_steering_fc6_090817.dat

Supernanogan Development begins. It will be a marathon. Main goals are high-charge emittance scans and RF frequency scans. Tall order.

Meanwhile, the MWS came out as planned. Thank goodness for the quartz liner, which took most of the hit from the magnesium. IOS optics are another story. We are running with an alternate tune for Q1/Q2/Q3, as noted elsewhere. The Supernanogan, already at vacuum, pumped down nicely, as did IOS and the IM section. Basically it was a weekend of HV conditioning. Mostly as expected. We got to a solid 27kV. Plasma lit and 22Ne2+ beam tune installed and beam on FC6 for hours. I'll include a stripchart if I can find one.

Preliminary mass scan. It looks okay. Slits are wide-open. Yes, I found a 22Ne2+ FC6 stripchart too.

Next:

• Slits in: done.
• Check A/q calibration: change const22 from .04156 to 0.041777 based on 22Ne position.
• Mass scan:

Marco gave us the all-clear this morning to shut down the MWS. We are preparing to remove the MWS head from the Y-box and blank it off, in order to maximize the vacuum around the Supernanogan. I have advised Marco of our intention to do this and that there is no going back. He is good with that. More in a bit.

Here is a stripchart of the 25Mg beam. The EE was off for the night. Turning it on restored beam immediately. It reached equilibrium after about three hours. pretty good, and pity that we have to shut it down now. Save: 090814_1352.snapiosfc6.

Emittance scans with beam as-is and with slits out. Best I could do, Rick.

P.S. At the bottom I added a couple of charts of the separator field. The stability system is working very well indeed. You can see it active and inactive over the last few days in the trar plot.

As noted earlier, the MWS beam dropped out at some point after yesterday afternoon's playtime, due to insufficient PE. Plasma was lost. I restarted the source remotely. The present combination of Ne flow SP = 1.2ccm and PE = 48V works well. Plasma will persist regardless of Mg presence or PE setting. That's a good thing. Then using the PE we can control how the plasma ionizes the Mg material. Note the attached stripcharts. At the lower PE settings, the Mg loading on the EE is much reduced and indefinitely sustainable at those levels.

Presently the source is off for Supernanogan cart installation. We will have it in and buttoned up by around noon.

Well, so it goes. As I was penning a note for OPS, the source tripped. It easily reignited with a little extra Ne. I left the flow slightly higher, from 1.1 to 1.2ccm and the PE at 41V.

So... we have had this on-going problem with intense Mg beam coating our optics. Keerthi found a good recipe last week with PE on and a somewhat large support gas flow. We have been running with several tens of nA since. Since yesterday's trip, I have been gradually lowering the PE from my initial value of 100V to 30V presently with about 10nA on FC6. Beam looks like it will be very stable, and the EE will maintain indefinitely like this. The first test: Marco just made overtures to use the beam for checking TIGRESS tune.

Finally, here is the "original" beam. Can you tell the difference (side-by-side at bottom)? I can't.

Data file: 090810_1738.ILTEMIT.txt

Here is a variation I thought might be appropriate.

Data file: 090810_1724ILTEMIT.txt

Here is the emittance scan that Rick requested, beam with Q4/5/6 off. Note that present numbers for these quads do not match theoretical. I repeated my slit nudge check for clipping, just in case. As before, no clipping for the first mm or more.

Data file: 090810_1713.txt

Before proceeding, I nudged in each of the slits, watching for first clipping. With the current emittance (nice), the beam cleared both slits completely; the upstream slit began clipping at about 1.5mm, and the downstream one at about 2mm. Also, FC6 current with slits in/out was: ~30nA / ~57nA. Note: I had to change the scanner parameters a little.

Data file: 090810_1648ILTEMIT.txt

A series of 25Mg emittance scans for Rick.

Starting scan with everything as-is, i.e. slits closed.

Data file: 090810_1621ILTEMIT.txt

Summary: good.

Details: A trip occurred at some point. I restarted the source over the weekende remotely. I have been tweaking down the PE since. Looking mighty fine. Stripcharts attached. Separator field nicely flat too, with stability program running. Save: 090810_1605.snapiosfc6

Around noon, Keerthi adjusted the PE down to reduce the intensity of the Mg beam, as we are running with attenuators in. He ended up with about a 30% reduction, and improved the noise band by about 3x in the process.  Here is a repeat emittance scan. Both sets of slits are at 2.5mm position. I also took the opportunity to reset the separator stability equipment again.

Interesting, the beam took a step down a couple of minutes after hands-off. A tweak on the separator suggests that it's already about optimized. Well...

Sophia is back to tuning now.

While there is an SC cavity issue, I have been repeating last evening's emittance scans. Here is the best one. About 70nA of 25Mg on FC6 presently. Note that emittance rig Faraday cup is reverse-biased. Also, overnight stripchart appended. You can see a gradual increase in current draw on the EE power supply as there is a build-up of Mg.

Later... Rick analyzed this scan and came up with his own numbers, with which he is happy. Here is his pic.

Tuning has been on-going through the day. Here are a couple of emittance scans taken in-between heartbeats. The first is zoomed out, the second zoomed in a little close. We managed to sneak in a third also.

So... there evidently was a power bump overnight, because the stability power supply was "disconnected" from the system. This happens every time there is a power bump. It's a serial port thing. Meanwhile, the source also tripped. Upon restart, nothing was the same. This morning, we found that Q3 was current-limiting on one element. We have asked Rick to develop an alternate tune for us.

Keerthi did some source tuning early this morning. We since shut it off for the swake of Q3. I have restarted it now temporarily. Here is an emittance scan with slits open and Q3 off. Now we will shut off again to prepare Q1 & Q2 supplies for new numbers.

Tuning...

The source stayed up overnight just fine, with a little 25Mg beam on FC6. This morning I did a few mass scans to get a fix on Mg positions. Short story: There are some 3nA of 25Mg on FC6 presently, with things less than optimal. Stay tuned.

Attached is an early graph of Mg beams produced with the MWS almost exactly five years ago. Best I could find for now.

Later... Tuning went well. I ultimately had to tune in the ICR due to network response outside as people came in, etc. There are some 10nA of 25Mg on FC6 now, and the tune is set up for RFQ delivery. Snap: 090804_1240.snapiosfc6. I tweaked the upstream vertical steers slightly afterwards. The front-end differs from Rick's numbers by a bit, but it's necessary to keep down spills onto optics and get the beam through. I'll attach the differences below. Meanwhile, here are stripcharts of FC6 for the morning. In the latter part you can see where I turned down the microwave power from 600W to 500W. Slightly more than 500W seems about right for equilibrium. But to avoid boiling let's leave it at 500W for now.

A decent emittance scan is in the ISAC elog, albeit I ran it with slits closed down, so it should be repeated at some point with slits open.

Conveniently scheduled for BC Day, we are preparing to switch over the MWS to sputter operation with MG source material. Operations has saved present 21Ne tune.

Later... Done! Source is relit with 21Ne beam on FC6.

Summary:

• Vent IOS to Ar
• Remove MWS backplate
• Machine Mg metal disk (source material) for mounting screws
• Hand-cut Mg disk in two halves and clean
• Clean backplate
• Attach disk halves to backplate
• Clean assembly
• Reassemble at OLIS
• Pump - roughout was fast
• Pump - turbos on
• Minor MRO
• Button up and go with previous settings.

We will let it run this way overnight and shoot for an Mg plasma and beam tomorrow.

Attached below are plots of the last few hours of 21Ne beam. PDG, I'd say. Note the variation in sync with room temperature.

21Ne has been available from the MWS since mid-week. Here is roughly how last week unfolded to now:

Monday: MCIS -> MWS and remove MCIS cart
Tuesday: leakcheck MWS source gas manifold
Wednesday: Controls fixed interlock oddity on IOS:BIAS
Wednesday: Begin setup for TUDA-II
Thursday: continue tuning to TUDA-II
Thursday: prepare to commission new SEBT NIM
Friday: commissioning of new SEBT NIM
Friday night: begin setup of beam to TUDA-II
Saturday: 21Ne5+ delivery to TUDA-II began at about 07:30 for the first time
Saturday: 21Na5+ delivery to TUDA-II switch at about
Saturday evening: power bumps knocked out OLIS and other systems - thunderstorms - go idle for the night
Sunday afternoon: check tune with pilot beam
Sunday night: resume RIB delivery

I expect several energy changes over the next little while.

At the Beam Delivery meeting today, we discussed the up-coming 25Mg run, which has scheduled a mere 48h of turnaround time. I made it known that there is *no* margin in that time allocation. I put in a bid for the preceding Friday, August 1st. Marco didn't think it would be available that soon.

Last night Keerthi resolved the sparking issue in MWS and started the source while I was present. There was a frozen interlock condition ion IOS:BIAS, which Graham resolved today. HV was on by ~11:00. Beam on FC6 immediately. It looks like Sophia took the beam at that point. I noticed that the Kepco appears not regulating, and in any event is close to a limit (0.3A). I have asked Sophia for five minutes to reset it.

It turns out that the system cannot see the Kepco on the USB port. This has occurred before. It will take some investigation... later. Also, the gaussmeter is reading erroneously, and MagStab iappears to have picked up the EPICS probe values instead, although no field corrections are being made.

Vacuum came down to ~7e-7 Torr. On startup, bias sparked over somewhere. Vacuum leak was caused. Later we found that HV had sparked through the source gas tubing, which was touching the beamline frame. Obviously an arc had formed within the tube and sparked through on the ground side. We also could not reset the bias interlock (ICR has efaulted this), so we ran in local. System is set up for 21Ne with about 28nA on FC6. Bias is off for the night, while plasma remains on. Bias can be turned on at will, preferably via EPICS. Fine-tuning will take place mid-morning Wednesday.

Other notes: Neon gas line checked for any sparkover leaks. None. It was closed down and pumped during the course of leak-checking today. Checked: bottle valve open, and line valve open. Plasma electrode in this mode is best near zero. About 3V is good, which locks in one plasma mode. At zero and with the quartz  liner "can" installed, the plasma could toggle through different modes as plasma wanders back and forth through the plasma chamber. Also, microwave power can walk the plasma. Goal: Move the plasma back as far as possible so that a clean beam exits the source, i.e. good beam on cups with relatively small spills on collimators. In an otherwise identical setup but without a liner, the plasma would form adjacent to the backplate, a different mode of operation altogether.

With the MCIS cart removed, Geoff hooked up the leak detector to the MWS source gas line. He did a couple of hours of leak checking in this mode. Then he moved the connection to an empty gas port on the manifold itself. Much qicker responses. We replaced a VCR seal on the bottle side of the right-hand He solenoid valve. That did wonders. He checked around afterwards, but found no further leak. We tidied up and opened the manifold to IOS. Base pressure was about 1e-6 Torr and holding. After an hour or more, I decided to reinstall the leak detector on the manifold to assist pumping. I suspect air trapped on the front-side of the flow controllers. Opening them wide caused a vacuum spike, which recovered. It all seems to be working, and that is where we are right now.

We discussed whether or not to leave the Supernanogan in the OLIS Faraday cage, and decided no, because the up-coming runs will use the MWS at 42 and 52kV respectively, higher than the MCIS HV rating. Bonus: We have more working room in the cage. The cart is out and parked. Services are connected and up.

Run Plan:

• Remove MCIS cart.
• Set up for leak-checking MWS gas manifold.
• Pump manifold through IOS volume.
• Repair leaks as necessary.
• Pump.
• Start MWS with 21Ne beam.

 Beam to scheduled user at 08:30 Friday. TUDA-II safety commissioning is planned for Thursday. Sophia will need beam prior in order to set up into SEBT.

The 18O4+ run at about 5MeV/u ended this morning with reasonable success, I'm informed, despite MCIS vacuum trips, SC cryo trips and a power bump for good measure.This morning I found beam at FC6 unstable. It appeared to be toggling between plasma states. A little tweak of a few MHz up in microwave frequency not only stabilized it but also multiplied the brightness. Too bad the users didn't have this beam. Emittance scan in progress now.

Next up: 21Ne to TUDA-II. We will begin preparations for switchover to MWS operation shortly. We are discussing a run plan now.

Check beam at FC6. Still toggling. Tweak RF from 15.4790GHz to 15.4823GHz, a change of a mere 3.3MHz, and amplitude from 8.470 to 8.670dB. The RF multiplied the intensity, and the amplitude locked the plasma mode. Sweet! Striptools and final RF settings attached. Too bad we have to shut it down now. Close isolation valves, MCIS optics off, vacuum off. Prepare to access cage. Note: Bias and EL could not be turned off via EPICS.

Beam switched back to 18O4+ by 11:00 as agreed. Some glitches. Here are snapshots of how it looked at handover time.

Later... Sophia prefers using all previously-saved files including ion source. Okay.

Note: For fun, Controls took away isacwserv mid-morning. The ICR did not communicate to them that I was the user... Workaround done with Keiko.

A/q = 2.666 Field = 767.1G FC6 = 3enA

A/q = 2 Field = 667.3 FC6 = ~10enA

A/q = 2.2857 Field = 710.5G FC6 = 100pA

A/q = 2.571 Field = 753.5 FC6 = 50epA

A/q = 3 Field = 813.9G FC6 = 2.2enA

I tweaked the adjustment of the displayed A/q calibration to fit this one.

Go fishing in the range 2.24-2.26, but no fish in this pond this time. However, there is a relatively strong beam at 2.3.

A/q = 2.3 Field = 711.2 FC6 = 110enA

No emittance scan possible.

I did a check at A/q = 2, and found a strong peak at 2.04 field 668.8 18enA, suggesting that the A/q panel calibration is slightly off for the lower masses, and in the right direction for the above to indeed be 18O8+. Good stuff.

Next stop: 18O6+.

There are the last couple of hours of Supernanogan Development for this set. Our run plan included 17On+ studies. Time will not permit it this time around. Also, the emittance numbers of 16O and 18O are not distinctive enough as they stand to warrant studies of the in-between mass. Keerthi will run the emittance data files through his software during post-analysis, and we'll develop our next run plan based on his conclusions.

This morning I will redo a couple of emittance scans that were not optimal yesterday. We'll start with an 18O4+ emittance check, then 18O8+, where, though I don't expect an emittance scan, I do expect to see beam. A vacuum trip on Wednesday evening probably compromised source vacuum and therefore the ability to generate the higher charge states. Here we go.

18O4+ emittance checks well.

Here is a summary of emittances gleaned from the aforementioned elog entries.

 18O4+ restored onto FC6 ~20enA, which seems slightly low.

A/q = 18 Field = 1987.1 FC6 = 161nA

A/q = 16 Field = 1873.4G FC6 = 204enA

A/q = 9 Field = 1405.0G FC6 = 55enA

A/q = 8 Field = 1324.8G FC6 = 172enA

A/q = 6 Field = 1147.2 FC6 = 39.3enA

A/q = 5.3333 Field = 1081.6G FC6 = 110nA

A/q = 4.5 Field = 993.5G FC6 = 20enA

A/q = 4 Field = 936.7 FC6 = 54.0enA

A/q = 3.6 Field = 888.6G FC6 = 6.2enA

A/q = 3.2 Field = 837.7G FC6 = 14.5enA

A/q = 3 Field = 811.2G FC6 = 1.6nA

Not quite enough beam for an emittance scan.

A/q = 2.6667 Field = 764.7G FC6 = 3.0nA

A/q = 2.5714 Field = 751.1G FC6 = 40epA

No emittance scan possible.

A/q = 2.2857 Field = 708.0G FC6 = 70epA (noisy)

No emittance scan possible.

A/q = 2.25 Field = 702.5G FC6 = not visible

It looks like last night's vacuum trip is biting us here.

A/q = 2 Field = 662.3G FC6 = 150epA (unstable)

No emittance scan possible.

A/q = 4.5 Field = 993.5G FC6 = 24.0enA

I ran through a calibration exercise for the IOS slits. Here is my data. I have moved each set to the midpoint of the largest (5mm) slit position. This does not necessarily agree with the book value. Never mind. Leave 'em alone, even though it appears that the numbers are switched (they're not).

Check 18O4+ emittance and compare with yesterday: good. Note again that emittance rig is running with manually-fitted reverse bias.

The MCIS vacuum system tripped last night again. Fortunately the operators noticed it and restarted stuff. Otherwise we'd be having a very long day today. This looks exactly like the same MCIS:PV1 trip we've experienced before. Attached is the FC6 beam recovery.

Graham looked up the list of IOS bias assignments. None was form the emittance rig. I quickly tested the list in ILT, but nothing jumped out. Keerthi provided a battery setup, which I have now installed. Here are example scans, untouched, of forward and reverse bias. I leave it to you, dear reader, to figure out which is which.

18O4+ beam restored for the night. Take a scan and verify it's restored well. Nice.

A/q = 3.6 Field = 888.6G FC6 = 10nA

Two emittance scans, one with the as-is emittance rig, one with a manually installed battery for bias.

A/q = 3 Field = 813.2 FC6 = 2.9nA

Beam is too faint for a good emittance scan, but it's visible. Redo with reverse bias, if possible...

Sideshow: IOSIOC reboot for Maintenance. Recovery protracted... Some MWS bias interlock problem. Also, many optics devices were zeroed. (When will this be fixed anyway?) Fortunately the MCIS optics actually stayed in their prior states.

Later... Request Operations reboot IOSIOC, as interlock condition is still there, and it prevents me from seeing A/q. Nothing to lose. Nothing gained either. Graham is here, and we've been discussing stuff. Recently I got the MWS bias on, with glitches. I can no longer turn it off, but that's fine for me. Let's move forward with emittance now.

After many attempts, here is the first emittance scan. Looks like coarsely ground pepper.

A/q = 2.571 Field = 752.9 FC6 = 88pA

A/q = 2.25 Field = 704.7G FC6 = <pA

Well, it's there, but pretty faint. The attached stripchart shows no beam then beam. FC6 bias has to be revered to see it.

Repeat emittance scan of present 18O4+ beam. It compares okay (somewhat broader emittance numbers)  with yesterday's scan. Also attached is FC6 beam overnight. Nice.

Proposed run plan for this time:

• Document TIGRESS tune.
• 18O4+ emittance scan.
• Mass scan A/q = 0 to 25.
• Repeat 18On+ emittance scans at present RF frequency. 
• 16On+ emittance scans at present frequency.
• Plot 16On+ & 18On+ emittance on one graph.
• If indicated, then do 17On+ background study.
• Open 17O gas bottle to system.
• 17On+ resonance survey based on 18On+ results.
• 17On+ emittance scans.
• Add 17On+ emittance values to graph.

I have begun a mass scan from 0 to 25. It will be a while. Data file: masscorr_mcis__0-25_090714.txt. 25nA of 18O4+ restored to FC6.

We have a change of schedule. Due to circumstances, Sophia will continue tuning to TIGRESS this morning. Sgan Development will resume this afternoon.

Details: The beam path through the TIGRESS chamber is clear presently, and no detectors are mounted. It is the perfect time to send a nA pilot beam to the end of the line. TIGRESS intends to install electronics starting at noon. Sophia expects to have tuning comfortably completed by then also. She and I have agreed to the following schedule: 

Note: An SC vacuum issue arose this morning, which truncated Sophia's tuning efforts for today. We have agreed to a slightly earlier handover time on Friday, so that she can tune through the chamber. It will be more difficult, as there will be detectors installed by then.

Beam has been on FC6 for an hour or so. It looks pretty good. Stripchart attached. Save: 090714_1231.snapmcissebt3a. Note: There is something fishy about the slit panels. I think an IOC got rebooted somewhere along the line, and the slit motors are out of calibration. I have recorded the pot values in the save file. Emittance scan of Sopohia's 18O4+ beam appended.

As noted, Keerthi was called to restart the source after a power bump. He continued Supernanogan development through the night (can you imagine?!?). He made some great progress. Here is a partial summary of his findings.

Actions taken: frequency scans across the entire range from 12-16GHz for each charge state of 18O.

For 18O4+, the "perfect" resonance occurred at 13.00GHz, with other resonances at 13.26, 13.54, 13.74... i.e. at about 26MHz intervals. The lowest resonance is the least noisy. However, if it trips, it is also impossible to restart it without playing with the RF. Based on Keerthi's instructions, I have written up a draft of an ION note for Operations, describing how to restart the Supernanogan source if it trips. I have asked the operators to critique the draft. The present RF state is attached below.

An MCIS vacuum trip occurred somewhere around 15:30. Sophia observed a drop-off in beam. The cause looks like the PLC-related business that we have experienced many times before. This fault has not manifested itself for quite a while, since Controls firewalled the MCIS portion of the network on March 30th.

As per our agreed deal last week, today is reserved for Supernanogan tuning to TIGRESS. Development will resume tomorrow.

There was a power bump overnight that knocked out many systems, including OLIS. The ISAC elog mentions something about it here. It seems that Keerthi restarted the source. (Note to self: Write an ION with brief restart instructions for the Supernanogan.) 18O4+ beam was left on FC6, and it is very nice, as you can see. Sophia has the beam now.

The Supernanogan was restarted this morning, after last night's power bump. 18O4+ on FC6, cooking for about an hour. Looks very good. Keerthi is doing frequency scans today to find best resonances. Time permitting, he will do this over a range of 18O charge states. He is also developing a dual-mode (MCIS/MWS) IOS tune. At some point over the weekend (my guess is tomorrow evening), he will open the 17O source gas bottle to the system.

The Supernanogan was restarted this morning, after last night's power bump. 18O4+ on FC6, cooking for about an hour. Looks very good. Keerthi is doing frequency scans today to find best resonances. Time permitting, he will do this over a range of 18O charge states. At some point over the weekend (my guess is tomorrow evening), he will open the 17O source gas bottle to the system.

Here is a striptool of 18O8+ beam (magenta trace) last evening from about 18:00 to 22:30 when there was a large power bump coincident with a plane crash in Richmond last night. Before the trip, beam current was about 20epA on FC6 (normal bias).

Keerthi did some 18On+ frequency scans this morning. He observed 18O8+! I am attempting to repeat it myself now. Reverse bias on FC6.

Peaks at:

13.0277GHz => 1epA (unstable)

13.1023GHz => 1epA (unstable)

13.1695GHz => 10epA (unstable)

13.1672GHz => 20epA (unstable) stripchart attached

13.006GHz => .7epA stripchart at 17:24 attached

First, optimize current versus frequency and amplitude. Unfortunately at 5dB the beam blinked out. Go fishing, then find it again. Attached is stripchart at 17:30, where I was optimizing, then switched bias to Normal, then watched beam blink out. Then stripchart at 17:49 shows beam back again, reverse bias on the left and normal bias on the right: ~10epA. RF settings also attached. Minutes later, beam is still on. FTR, the original RF is appended at the end.

The 18O source gas bottle is online. The ion source was optimized for 18O4+ and kept the same throughout. Emittance scans of each charge state of 18O were attempted. Visible scans were found for all states up to 6+. At least one more set of scans is desireable. Present beam is 18O4+. Next up: RF frequency survey with 18On+.

A/q = 2.25 FC6 at reverse bias MB = 736.9G @ 42.9A

Not enough intensity for an emittance scan. Possibly on the edge of A/q=2.3 (23Na10+?).

A/q = 2.57 FC6 = 0.25nA MB = 790.0G @ 46.2A

Not enough intensity for an emittance scan.

A/q = 3 FC6 = 5.5nA MB = 851.5G @ 50.1A

A/q = 3.6 FC6 = 12.5nA MB = 931.8G @ 55.3A

A/q = 4.5 FC6 = 29.5nA MB = 1041.8G @ 62.4A

A/q = 6 FC6 = 49.5nA MB = 1201.4G @ 73.1A

A/q = 9 FC6 = 50.0nA MB = 1470.8G @ 90.8A

Here we go. A/q = 18 FC6 = 141.0nA MB = 2078G @ 130.2A

First up is a check scan of 18O4+. There is a definite vertical offset compared to earlier today. Otherwise, it correlates well enough. The same beam taken with a greater vertical offset follows, together with the modified emittance panel.

A mass scan from A/q of zero to 25 is in progress. Data file (large): masscorr_mcis_090708.txt. The source is optimized for 18O4+. Fishing for 18On+ states and their emittance scans to follow. Attached is one screenshot of the Gabe's Calibrate interface. I ran it several times with different peak selections from the same data. I entered into the EPICS mass correlation program a best average of the calibrations for the two constants.

* 18On+ emittance scans at present ion source settings: complete today.

* 18On+ frequency measurements: Thursday.

* 17O source gas: open end of Thursday.

* 17On+ frequency survey: Friday.

* 17On+ emittance scans at idealized source settings: Monday.

* Development completion: Tuesday.

* 18O4+ setup for beam schedule: Wednesday.

Tune saved as 090708_1200.snapmcisfc6. I settled on the 15.486GHz optimal frequency, and tweaked that for effect. Then I ran a few emittance scans. During that process, I noticed that the beam intensity had stepped down and up a few times. So I tweaked the frequency again to return 30enA on FC6. Note that in this process the beam shifted slightly in the horizontal plane. The emittance shape is different also. Attached are emittance scans in sequence, the last one being the "real" one for this test. Finally, before and after RF screens.

15.480GHz => 30.0nA

P.S. Appended is a stripchart of the 18O4+ beam on FC6 following the emittance scans (magenta trace, between T-5 and T-4h). Not bad, eh?

Starting frequency: 15.7864GHz => 870pA on FC6  Step size: 1MHz. Selected peaks shown. There were many smaller resonances in-between also.

Strong peaks at:

15.8594GHz => 7.5nA

15.9834GHz => 1.3nA

16.0354GHz => 1.3nA

16.107GHz => 1.5nA

16.183GHz => 0.9nA

16.247GHz => 1.4nA

16.284GHz => plasma extinguished

16.248GHz => plasma re-ignited

15.860GHz => 7.5nA

15.685GHz => 3.5nA

15.518GHz => 2.5nA

15.486GHz =>  27.5nA

15.479GHz => 4.3nA

15.277GHz => 2.8nA

15.130GHz => 3.7nA

15.035GHz => 6.2nA

14.903GHz => 3.8nA

14.799GHz => 2.6nA

14.763GHz => 11.8nA

14.554GHz => 8.8nA

14.455GHz => 4.2nA

13.588GHz => 1.1nA

13.398GHz => 3.0nA

13.281GHz => 2.7nA

13.223GHz => 7mA (unstable)

13.153GHz => 7.5nA (unstable)

13.061GHz => 10.0nA (unstable)

13.019GHz => 40.0nA

13.002GHz => 50.0nA (unstable)

12.986GHz => plasma extinguished

13.089GHz => plasma re-ignited

15.4798GHz => 30.0nA 

After accessing the OLIS cage and opening the 18O source gas valve, I restarted the Supernanogan source last evening around 18:00 ( just to the left of -15h on the attached stripchart), with the line set up for 18O4+. The beam on FC6 grew nicely overnight. MCIS pressure moved from ~6.5e-8 to ~7.1e-8 Torr since the 18O source gas bottle was opened last evening.

As noted earlier, we have 17O and 18O source gas attached to the Supernanogan source chamber. Both are valved off presently. The source has been running for a while. I set it to 18O4+ on background, which gives about 125epA on FC6. Now let's stop the source, open the bottle and try the same again.

I opened the 18O valve just around 18:00. Beam is on now, around 150pA. That's a good sign. It's growing too. Even better. The MCIS tank pressure moved from ~6.5e-8 Torr to ~6.6 as I opened the valve, which is located upstream of a calibrated leak. Note that both source gas bottles have 10-5 calibrated leaks in series, so it will take a while to reach equilibrium. I attempted a couple of emittance scans, but it's too early yet.

Keerthi and I were front and centre doing ISIS emittance rig testing this morning. He ran it, and I tried to find ways to run the data in Matlab afterwards. Main limitation up there at the ISIS Console is lack of any ssh-enabled terminals. Keerthi's wireless laptop is okay, but this stuff pushes the poor little thing to the edge. Plus, there were some X display issues on it. He has Matlab installed locally, but it takes a bit of a rocket scientist to run it, and once you do get it going, Matlab complains that the data file format is incorrect. We believe it's a matter of line endings: Windows versus the rest of the unix/Linux/Mac/VMS world. So it goes. All in all, a successful morning. There is enough data to think about how it all works, and we have a couple of hours of R&D again tomorrow morning before production beam. I'll put in a few emittance panels here in a while. Keep in mind that these are with beams on the order of mA, not nA!

DataFile    Pulser     Arc       90%     86%     63%    cut%    #71    #72    111    112    113    30    nor. Emit.
 95152        5%        6A      4.01    3.51    1.91     1%                    0      4k     4k             0.101
102032       10%        6A      1.59    4.02    2.1      1%                    0      4k     4k             0.116
102904       20%        6A      4.89    4.29    2.21     1%                    0      4k     4k             0.122
103602       30%        6A      5.18    5.11    2.7      1%                    0      4k     4k             0.131
105650       40%        6A                               1%                    0      4k     4k        
             60%        6A                               1%                    0      4k     4k        
115852       70%        6A      6.21    5.56    3.07     1%                    0      4k     4k             0.157
120728       70%        6A      6.07    5.41    3        1%    2159            0      4k     4k             0.154
122216       70%        6A      5.96    5.32    2.94     1%           2247     0      4k     4k             0.151
123149       70%        7A       (no tuning)             1%           2247     0      4k     4k             0.147
124609       60%        7A       (bit of tuning)         1%     all tuned           all tuned                    

Meanwhile, OLIS and the Supernanogan were off overnight in preparation for transformer tap selection for the sake of the CSB. See WP#2009-07-07-7 for more details.Turbos were turned off in preparation for attaching 17O and 18O source gases. Both are attached now, and valved off presently. I restarted the Supernanogan with about a nA of 18O2+ at FC6. Let it cook for a bit.

Well... my browser blew away just before I submitted version one of this entry. Let's try again.

Keerthi changed the tune this morning to 10kV on the MCIS bias in order to allow the full throw of the Enzel lens power supply. (Remember, for the moment the panel displays twice what the physical power supply is actually delivering, because it is a 10kV supply, whereas the control system expects a 20kV supply. Such will be the reality in the fullness of time.) He looked at 18O in background gas. It's there all right. We have an up-coming TIGRESS run that calls for 18O delivery. The schedule shows 21Ne for that run, which goes from July 15 - 20.But in fact 21Ne was just a placeholder and 18O is really required. That put us in a spot, because we had not ordered a backup bottle of 18O source gas, and our present bottle would only give us a very few days of operation from the MWS. However, the same bottle would run for months in the MCIS.Pick an option. We floated this situation at the Beam Delivery meeting today. The user really wants 18O, not just an A/q=18 or 9 pilot beam. Good. We can delivery plenty of 18O4+ from the MCIS. Gordon confirmed that 18O from the MCIS is a done deal, and the general attendance concurred.

Run plan for the short term:

1. Complete 18O background studies today.

2. Shut down OLIS for transformer work in the morning.

3. Spin down turbos for source gas change.

4. Install 18O source gas tomorrow morning.

5. Restart vacuum system and source mid-morning.

6  Condition as required.

7. Check intensity and emittance of 18O4+.

Note that 18O4+ is the only charge state that fits within the acceptance range of the DTL. However, it is on the lower end of the Pre-Buncher. Historically a low-level pre-amp was required on the Pre-Buncher in order for it to operate properly. That's between Marco and Ken Fong et al.

Well... Firefox crashed again. What's up with that?

I am having an argument with the OLIS emittance rig. It is returning zero data on 18O scans. Try with 12C, where there is oodles of beam. Aha! A spot! A couple more passes, and we have a "perfect" 12C1+ emittance scan. Here it is. Note: Slits are at 5mm setting.

Now I am trying a scan of 18O2+ with some 1.5nA on FC6. Here we go... Faint, but it's there. Slightly different vertical offset. Done.

Prepare for orderly shutdown of source.

We had 16O3+ on FC6 on Friday. An IOSIOC reboot occurred mid-afternoon Friday unfortunately. Operators restored beam at about 06:00 on Saturday. Beam came back fine. I requested FC3 in at 18:00 Saturday to get some temperature correlation with total beam. Maybe there is a correlation, but a longer stretch is needed. Something stopped at 18:00 on Sunday. Keerthi told me this morning that he found steerers off, and switching them on restored beam instantly. Good. Plot attached. Red is FC6 beam. Brown is FC3 beam.

This morning Keerthi began studies on 18O background. Optics are now set for 18O2+ delivery. We will pursue that today. Tentatively the run plan for this week will include:

1. 18O background studies.

2. Repeat emittance scans of the charge states of 16O with slits open.

3. Prepare emittance versus charge and frequency versus charge for 16O, 17O, 18O, 20Ne, 21Ne and 22Ne.

16O2+ beam on FC6 = 10nA as before. Move to 16O3+ A/q = 5.33...

A frequency scan between 13 & 14GHz. I panned closer around two peaks at 13.11 and 13.12GHz. Best frequency so far is 13.1321GHz, which provides a reasonably stable 150pA of 16O3+.

Later... more scans, etc. One of several possible solutions for 16O3+: ~450pA at 13.6348GHz. Let it cook for a while.

Here are some pics and data from total MCIS beam on FC3 overnight. A bit inconclusive, but there may be a temperature correlation.

Let's take a look at varying frequency versus beam current for 16O2+. Starting RF values shown below. FC6 = 1.09enA.

What I did: Pan RF frequency between about 12.5GHz and 14GHz. Plasma seemed to extinguish at a frequency under 13GHz.

What I found: Two peaks on the low side, right around 13GHz.

How I proceeded: I panned across those two peaks for stability. I found that the stronger peak in fact was noisier, and also at risk of losing plasma.

Screengrabs:

1. Starting RF settings

2. Lower window of "good" RF frequency.

3. Higher window of "good" RF frequency.

4. Original beam plot.

5. Beam plot at middle of "good" frequency range.

6. Beam after frequency restored to starting value.

7. Frequency survey correlation plot.

As it turns out and as you can see, the original frequency not only provides the same intensity of beam, the beam is also visibly more stable. (Keerthi found this one.)

Lesson learned: Discovery of the ideal frequency is an iterative process. At least three passes, each successively finer, are required.

Happy Canada Day!

I noticed a long-term trend in beam intensity. I have every reason to believe that the source itself is rock-solid. I think it is temperature variation affecting the Philtek power suply on the separator magnet. What bothers me is that the stability program appears to not be compensating for this. I am looking into this now. Here is a plot of beam current, mag field and temperature (at AHU-1, the best I could do). There appears to be a delayed response to temperature. I have turned off our Hall probe for an hour or so to watch the response on a stripchart.

Well, there were results, but not what I expected. The beam became nearly out of control while the stability program was disabled. What's more is that the correct field came back immediately upon turning on our Hall probe again. Here are a couple of stripcharts, one snapped right after turning on the probe, and again a while later The stability program was disabled during the middle couple of hours or so. Note that the beam is oddly more stable in the short term now also.

There seemed to be some small change to the beam over the week of TACTIC running. I would like to poke around a bit. The emittance plots suggest some vertical movement at least. The two plots are the before (emittance) and after (emittance). The two tune saves are 090624_0930.snapmcisfc6 and 090629_1730.snapmcisfc6 (present tune) respectively. Here is how they look juxtaposed. I restored the downstream elements. Let's see what that looks like in an emittance scan. They compare well! All changes in beam position can be completely attributed to tuning changes. End of story. I have restored the tune and centred up the emittance plots. Done.

First, with upstream slits opened, then with both open. Original slit setting was 1mm. Finally, restore slits to 1mm and see if it reproduces. It does.

The first emittance scan sort of got interrupted; it auto-restarted just before the previous scan had finished. I thought the resulting plot was somewhat interesting. The emittance isn't half-bad either. A better scan follows. TACTIC took beam again for a while this afternoon to shake down a timing discrepancy. We got it back around 4pm. One more emittance scan for good measure.

Setup teething pains... The Start button on the emittance panel worked this time. But ICR called, requesting a few minutes more for Marco. No problem. When I went to restart the scan, the button no longer worked. Restarting X11 made no difference. However, there is a significant update available for X11, so I am installing it now. I perceive that it works, yes, significantly faster than its predecessor. Good, all good.

Supernanogan development starts today. The TACTIC run, which ended around 08:30 today, appears to have been a success. TACTIC used our beam for setup and pilot, then took 8Li from downstairs. Marco is doing some EOB checks now. We will begin at 10:00. First part of our run plan will be to compare the present 16O2+ beam with how it looked when we started, and identify what might have changed.

Proposed Run Plan for Today &ff

1. Compare present 16O2+ beam with start of TACTIC run and identify change factors.
2. RF frequency scans versus each charge state of 16O.
3. Identify frequency with largest bandwidth for each state.
4. Emittance scan for best beam of each state.
5. Compare with earlier emittance scans.
6. Select one clean beam and test whether or not RF amplitude changes best frequency.
7. Comprehensive mass scan.
 

We handed over a 16O2+ beam on Wednesday morning to Sophia for TACTIC setup. On our side, everything went well. TACTIC switched to RIB on Saturday night. See ISAC elog entry. We remain on standby for pilot beam. Schedule switched to development tomorrow morning. Attached is a stripchart of our beam for the last several hours. As good as it gets! Save file: 090629_1730.snapmcisfc6.

See ISAC elog entry today.  Keerthi developed a dual-mode tune last night, so that we can run the MWS at will if so desired. Save file: 090624_0930.snapmcisfc6. Emittance scans done. Overnight FC6 also attached. Sophia took the beam at 10:00.

Note: This is an updated emittance plot. The bias voltage was incorrect in the original datafile, therefore so were the emittance calculations. The plot itself is identical.

Supernanogan bias for this run is 16.32KV. After we were finished with source tuning, etc., we conditioned up to 20KV. Then beam was returned and 16O2+ tuned saved as 090623_1730.snapmcisfc6. Next step: Prepare MWS for dual operation. Source open now for source gas installation. Then Keerthi will develop a daul-mode tune, where the B1A bender only need be switched on or off to run either the MCIS or MWS source.

After a first round of source and line tuning for good current with minimum RF power, we have about 8nA of 16O2+ on FC6. Here is an emittance scan of that. Present RF settings are 15.438GHz and -1.0dB with less than 1W of RF power. Bias is 16.32KV. Let's do some bias conditioning for a bit.

We now have about 80nA of 16O2+, using the same source parameters as before. Keep a watch for a while, then tune the source to match user's needs, somewhere in the 10nA range.

Here is a stripchart of the 16O2+ beam for the last half-hour or so., and also the stripchart of it juxtaposed with 16O7+ earlier. Also a first 16O2+ emittance scan for this run. I will do source tuning with it momentarily.

Today is the last day of this set of Supernanogan Development. The source ran at 16KV overnight, in anticipation of 16O2+ delivery later today. I expected more bias sparking, but it appears that it sparked off only once. So I will condition at a higher bias later today. Meanwhile, the operators reported touching up the tune with the magnet and the RF. Perhaps we are seeing some temperature effect on the source, so I will be looking at effects of RF on 16O7+ for the next while.

 Below is a stripchart of the beam (in blue; turquise is RF power) for the last three hours, of which the last 150 minutes are at the present settings. Pretty good, I'd say. I double-checked the range on the RF, and it's exactly the same as the start. Excellent. To round things out, here is a last emittance scan of 16O7+ before we move to 16O2+.

In anticipation of 16O2+ delivery mid-week, we checked 16O2+ production from the Supernanogan source. No problem. We did have to use the tightest slit settings to achieve a low enough current for the user. Here are emittance scans, normal and with our test booster amplifier inline respectively. Subsequently we set up the line to match into the RFQ. Bias is at 16.32KV. Then we returned the mass selection to 16O7+ for the night. A final emittance scan of 16O7+ for today is shown. It clearly needs a stronger signal. With some slight tweaks, there are some 1nA of 16O7+ on FC6 now.

An emittance scan of the 16O7+ beam follows. Also, a stripchart of the same beam on FC6 overnight. Keerthi did some studies over the weekend. He found that the characteristics of the amplifiers behind FC6 and the emittance rig cup differ significantly. That's disconcerting. We did a visual this morning, and confirmed that the amplifiers are identical VME modules in the same crate. He believes it's a scaling thing. We will test again with a current source this afternoon.

Later... The apparent discrepancy between the two amplifiers was in fact a bad patch cable in the test setup. So that's solved. The two amplifiers differ in this way, that FC6 has the updated version with the middle gain ranges and auto-ranging, whereas the emittance cup does not. We will be asking Controls to update this amplifier to the now-ISAC standard. The test setup consisted mainly of a very high gain amplifier. Overall, the tests worked out pretty well, as you will see below in an emittance scan of 16O7+ done with the amplifier in the loop. The second emittance scan is 16O7+ and the highest EPICS gain setting, i.e. 1mA.  Note that Matlab is unable to calculate an emittance here. The third emittance scan is the same beam at the next gain setting, i.e. 1uA. We just about make it, with only a relative handful of data points clipped, and Matlab calculates emittance easily.

Here is a list of 16On+ emittance scans for today. Although IOSIOC got rebooted, restored tune was identical and trouble-free, and RF was untouched. Save file: 090619_0859.snapmcisfc6. Emittance values: pi-mm-mrad at 39%, 63%, 86% and 90% respectively. Here we go.

16O1+ datafile profile emittance 6.19 10.8 16.6 17.6

16O2+ datafile profile emittance 2.94 5.51 8.96 9.62

16O3+ datafile profile emittance 2.47 4.57 7.62 8.22

16O4+ datafile profile emittance 1.88 3.62 6.28 6.82

16O5+ datafile profile emittance 1.62 3.13 5.57 6.08

16O6+ datafile profile emittance 1.55 2.99 5.25 5.7

16O7+ datafile profile emittance 0.779 1.42 2.14 2.27

Keerthi developed a nice 16O7+ beam to FC6 last night. Beam current is about 3nA presently. Here is the first emittance scan from 11:05 today. A little spotty, but it's there. Higher resolution scan at 13:58 follows.

The third plot at 16:12 is 16O6+.

The fourth plot at 17:05 is a 16O5+ scan. However, the emittance rig stopped scanning at position #50, and is frozen at position #0 now. The operators are looking into it, and will reboot IOSIOC. I am ready to restore optics. Later... reboot and restore went well. Continue emittance scans.

The fifth plot at 18:36 is a higher res 16O5+ scan.

The sixth plot at 18:52 is 16O4+ and friends.

The seventh plot at 19:12 is 16O3+. It does not compare well with yesterday's scan of the same beam. Note that recovery from yesterday's IOSIOC reboot required a retuning effort. The source RF was changed in the interim also.

The eigth plot at 19:34 is 16O2+ and friends.

The ninth and final (for tionight) plot at 19:53 is 16O1+ and friends.

As mentioned before, IOSIOC was rebooted yesterday afternoon to unfreeze the emittance rig panel. It cost us our tune, which unfortunately wasn't saved very well. Lesson learned: Save often. I will run a mass scan now and check the mass correlations calibration. Then I will pick up with some 16On+ emittance scans. Keerthi was here until late last night working with the beam also. He will have some results for sure.

The first emittance scan of the day is in, 16O1+ at 10:29.

The second emittance scan of the day is in, 16O2+ at 11:00.

Break for a mass scan to A/q=50. (Fire alarm in ISAC-II rang around 11:30.) Here is the first part. I have run the data in Gabe's Calibrate program and adjusted the two constants slightly. Looks very good. BTW there are some new artefacts in the mass correlation plot that weren't there before. They don't affect anything but the appearance of the plot. However, they do append a few lines of spurious data to the plot data file, which have to be expunged manually.

The third emittance scan: 16O2+ check at 13:08. Looks OK.

The fourth scan : 16O4+ and friends at 13:24.

The fifth scan: 16O5+ at 13:31. This one should be redone.

The sixth scan: 16O3+ at 13:39.

A series of 16On+ emittance scans. Benchmark scan of 16O5+ matched well with same scan done this morning. Subsequent scans beginning with 16O1+ were thwarted by an IOSIOC seizure in the emittance rig EPICS panel, and an IOC reboot was required. ICR restored last saved DRAGON tune. So far, so good. Ah, well, not so fast. I have to go fishing for beam on FC6. This may take a while... That's it for today.

The 16O5+ beam stayed up OK overnight. ICR took some emittance scans this morning. They look interesting. A finer resolution scan is in progress presently. Goals today:

1. Comprehensive mass scan to A/q=100

2. Characterize 16On+ states, including emittance scans where possible.

Mass scan is in progress now. First look is attached below. The full scan is shown in Gabe's Calibrate application. Note the apparent lack of 84Kr, after a night of pumping with the source gas valve closed. A subsequent scan from A/q=0 to 20 is shown next. The same scan zoomed in at yesterday's scale is also shown for comparison of background intensities, particularly 16O5+ with A/q=3.2, which are higher today due to source tweaking this morning. Now I will start a series of emittance scans, starting with 16O5+ as a benchmark. I expect it to be near-identical with this morning's scan.

Keerthi suggested using 16O5+ for optimizing the source. I did a tight mass scan in that area, and 16O5+ is clearly visible. I will use it for some source tweaking. Also, I used Gabe's calibration program to slightly adjust the values of the two constants. There are some 10nA of 16O5+ on FC6 presently. Final settings for today, etc. are attached below.

We began looking at 84Kr this weekend. Keerthi had 84Kr19+ on FC6 this morning, which I was able to tweak up from ~300epA to about 600epA. Not bad! This evening it is down to 100pA at best. I think there is a correlation of multi-charge production and room temperature. (It's warm today.) Keerthi noticed tat an entire mass scan this afternoon was suppressed, where I had a solid scan earlier, the two taken the same way. Let's see what happens to FC6 overnight.

Damien Gallop wrote:

We began looking at 84Kr this weekend. Keerthi had 84Kr19+ on FC6 this morning, which I was able to tweak up from ~300epA to about 600epA. Not bad! This evening it is down to 100pA at best. I think there is a correlation of multi-charge production and room temperature. (It's warm today.) Keerthi noticed tat an entire mass scan this afternoon was suppressed, where I had a solid scan earlier, the two taken the same way. Let's see what happens to FC6 overnight.Beam d

Beam definitely correlated with something overnight. I'm going to say that temperature somehow affects MCIS vacuum, which in turn affects the generation of the higher charge states. We will investigate this further. We did a couple of mass scans this morning. I have closed off the krypton gas bottle to get a background scan. Here is the preliminary one, started a few minutes after closing the hand valve. You can see the clump of 84Kr charge states between approximately masses 4 and 10. Another scan to come shortly, with everything the same except an hour's delay after closing the valve. Here it is, below. The height of the "clump" is less, and it begins more to the right of mass 4 or so than the earlier scan. Note that the small amount of 84Kr remaining after shutting off the source bottle is slightly offset on the plot. I will recalibrate the numbers shortly.

A comment about RF power came up at the presentation this morning. Intense X-rays can be produced not only at the peak efficiency and output of the RF amplifier but also as a function of other parameters including source gas pressure, isotope(s), whatever you can think of. I set the RF at a mid-level power, with power setpoint at 0dB and adjusted the RF for optimal current on FC6. This occurred at 13.0306GHz with 35W power. About 6nA of beam. Take a quick emittance scan.

Presentation this morning in Auditorium. Players:

Keerthi: science

Geoff: engineering

Damien: operation

Cold start-up of source with 17O3+ beam to FC6 in front of an audience worked flawlessly.

Pumping went well overnight. TP3 turned on around noon. Issues with Kepco communications.

Krypton source gas teed directly into ion source. A Nupro valve and tee also added for 17O line. At present, the 17O gas bottle valve is closed. The Kr bottle has an integrated leak, so this bottle is opened to the system now. Pumping in progress. Pressure is already <3e-7 Torr. I will restart the source shortly.

We handed over the beam to Sophia for testing Rick's new tune. Although there are RF issues at the RFQ presently, her feedback to the operators is so far, so good. TBC tomorrow morning. Right now, we will open the OLIS cage and install a couple of source gases in preparation for our presentation on Friday.

Main event this morning so far: mass scans and post-scan analysis using Gabe's tools. We have a pretty good recipe now. Tight scan to mass 20 in progress. Later... good scan. Geoff and I did a dry run of our presentations for Friday morning. We used the Auditorium computers, etc. After some small teething pains, everything went well, including a cold start-up of the source. The 17O3+ emittance scan was taken quickly. Pretty good outcome anyway. The mass scan shows nice peaks at several known points: 1H+, 2H2, 4He, 7Li, 12C, 14N, 16O, 19F and 20Ne. Gabe's Calibrate tool returns values for the two constants that are pretty close to what is there now: -1 and 0.0419 calculated versus 0 and 0.0418 actual.

I have been testing various RF power settings for cold starts and beam stability. No surprise, the best tuner setting is approximately midway at about 58%. Different slit selections tested. Emittance scans in progress. Done.

Keerthi started the Supernanogan source today. His primary goal was to test out Rick's theoretical tune calculations. He was ecstatic with the results. Rick's table gives a tentitive value for the Einzel lens. In fact the ideal value is at or even higher than the bias voltage. However, Keerthi experieced sparkdowns at those voltages. Rick's calculation gives a reasonable number for better than 50% transmission between MCIS:FC0 and IOS:FC3. The Enzel lens at full chat (10KV with the present power supply) gives a transmission of close to 90% with 11.5KV bias. So far, there are no sparkdowns. Keerthi suspects a resonance effect with the earlier sparkdowns. Presently we are observing beam and optics stability, with about 16nA of 17O3+ on IOS:FC6. I'll do some scans in a while.

The TIGRESS run ended this morning. Supernanogan Development begins now for two weeks. Begin an 18O1+ emittance scan and also take some fast FC6 current measurements before we switch over.

The MWS delivered 18O overnight, mostly onto FC6. Sophia complained about source stability this morning. It definitely could be improved. Yesterday Keerthi did some online tweaking of the RF power for stability, with little improvement. The IOS pressure today is about 2e-6 Torr, so I believe the 18O pressure is too high for good operation, although the brightness is great. The base pressure is about 4e-7 Torr. Tuning is in progress. Given an opportunity, I would like to try one or all of the following:

1. Tweak RF power

2. Change 18O gas delivery to use the calibrated leak

3. Leak check the IOS section. Vacuum Group knows we would like to do this on short notice.

Later... Marco denied time for a look-see, even when they are ruminating. I had stripped various things against beam current, and did not find a strong correlation except separator field. It is blazin' hot around here today, and for sure equipment is having a hard time. I had hoped to turn off the magstab program for a few minutes and see where things go. Marco's reply was, they are happy with the beam as it is. Done deal.

A couple of weeks of 17O3+ to DRAGON ended yesterday with a photo finish. Supernanogan went off at 10:00. Preparations for 18O began. Main event for yesterday: Replace IOS:TP7. Edi Dalla Valle reported that he had just received a V550 with Conflat flange. "Our timing was perfect." It is working well. The system was under vacuum again by around noon, and pumped overnight. This morning IG1 was ~5e-7 Torr and IG4 was ~2e-7 Torr, where those two gauges were the other way around previously. We attempted to do a leak check, but could not get it coordinated in time. So by 15:00 we chose to start the MWS and hand over the beam to the users.

Present MWS source gas setup: enriched 18O attached in two places; the straight-through path is open, while the calibrated leak is closed. We approximated the appropriate pressure on the regulator, allowed it to bleed down, then reset it to slightly under. The bottle valve is open. The bottle pressure is 150psi right now. At this rate, the cost of the source gas is about $200/day.

Vacuum Group applied a temporary fix to the lower body seal on IOS:TP7, which we found last night to be leaking. Edi tells me that similar seals have failed before. It's an O-ring, not a metal seal. The fix now was to marinate the outside seam with silicon grease and wrap with Teflon tape. We'll see how that improves the backing line after a while.

Meanwhile, Vacuum Group is setting up to leack check the work.

The previous 18O4+/8+ run to TUDA-II finished midday yesterday. OLIS was prepared for 17O delivery from the Supernanogan source. Leak checking was done last night. The big offender was a failing metal seal on IOS:TP7. The pump will have to be replaced. Meanwhile the pressure is sufficient for 20nA of 17O3+ with 2.5mm (middle selection) apertures inserted. Present agreement is to leave TP7 as-is for this run.

End of run diagnostics done. See ISAC elog. Supernanogan cart is already installed and at high vacuum. Prepare to run 17O from Sgan sometime over the weekend. Today's agenda:

1. Close 18O bottle and gas valves.

2. Isolate IOS:CG0 to minimize pressure contribution from long copper lines.

3. Work around gate valve interlocks.

4. Set up for leak checking: IOS first.

We did some preliminary vacuum checks, and found significant loading on the IOS turbos, probably downstream near DB6. Leak checking now in progress.

test

My first OLIS elog entry.

Testing!