 Wed Jun 24 10:27:23 2009, Damien Gallop, Routine, General, 16O2+ tune ready for Sophia and Marco 
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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. |
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Tue Jun 23 18:04:30 2009, Damien Gallop, Routine, General, MCIS HV conditioning to 20KV
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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. |
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Tue Jun 23 16:48:00 2009, Damien Gallop, Routine, General, 16O2+ on FC6 after source tuning
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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. |
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Tue Jun 23 15:02:38 2009, Damien Gallop, Routine, General, 16O2+ on FC6
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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 |
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Tue Jun 23 10:33:43 2009, Damien Gallop, Routine, General, Effects of RF on charge state
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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 |
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Mon Jun 22 20:28:37 2009, Damien Gallop, Routine, General, Preparations for 16O2+ delivery 6x
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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+ |
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Mon Jun 22 16:00:04 2009, Damien Gallop, Routine, General, Emittance thoughts and other matters 7x
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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 |
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Fri Jun 19 20:15:19 2009, Damien Gallop, Routine, General, Summary of 16On+ emittance scans
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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. |
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Fri Jun 19 11:59:49 2009, Damien Gallop, Routine, General, 16On+ emittance scans continue 18x
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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+. |
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Thu Jun 18 09:38:52 2009, Damien Gallop, Routine, General, Check Supernanogan beam after IOC reboot yesterday 15x
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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. |
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Wed Jun 17 17:01:07 2009, Damien Gallop, Routine, General, 16On+ emittance scans
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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. |
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Wed Jun 17 10:14:57 2009, Damien Gallop, Routine, General, 16O5+ on FC6 overnight 6x
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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 |
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Tue Jun 16 16:47:02 2009, Damien Gallop, Routine, General, Mass scan around 16O5+
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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. |
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Mon Jun 15 17:49:23 2009, Damien Gallop, Routine, General, 84Kr charge states begun
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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. |
 Tue Jun 16 12:10:17 2009, Damien Gallop, Routine, General, 84Kr charge states begun
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Damien Gallop wrote:
We began looking at 84Kr this weekend. Keerthi had 84Kr19+ on FC6 this morning, which I was able to tweak |
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Fri Jun 12 14:24:49 2009, Damien Gallop, Routine, General, 17O3+ beam at optimized RF
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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 |
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Fri Jun 12 14:12:04 2009, Damien Gallop, Routine, General, OLIS & Supernanogan Facilities presentation
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Presentation this morning in Auditorium. Players:
Keerthi: science
Geoff: engineering |
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Thu Jun 11 12:10:22 2009, Damien Gallop, Routine, General, Supernanogan status
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| Pumping went well overnight. TP3 turned on around noon. Issues with Kepco communications. |
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Wed Jun 10 18:48:53 2009, Damien Gallop, Routine, General, Krypton source gas fitted
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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. |
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Wed Jun 10 17:49:40 2009, Damien Gallop, Routine, General, Beam to RFQ
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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. |
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Wed Jun 10 11:22:59 2009, Damien Gallop, Routine, General, Supernanogan development mass scans
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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 |