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.

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.

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.

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.

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.

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.

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.

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

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 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.

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.

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.

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.

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

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.

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

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.

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

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