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.

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:

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

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.

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.

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.

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.

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.

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

090916_1206ILTEMIT.txt

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

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.

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.

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:

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.

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.

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.

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.

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.

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.

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