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.

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-

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 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.

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.

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

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.

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.

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.

My first OLIS elog entry.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.