 Wed Dec 16 14:07:37 2009, Damien Gallop, , , OLIS development for CUSP source continued 
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Today we vary source gas pressure.
Later... Several iterations of pressure, tuning and standing on our heads. Representative emittance scans attached below. TBC tomorrow. |
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Tue Dec 15 17:50:38 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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. |
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Mon Dec 14 10:01:52 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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. |
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Fri Dec 11 18:03:30 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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. |
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Thu Dec 10 08:59:05 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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. |
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Wed Dec 9 10:24:45 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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 |
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Tue Dec 8 12:40:17 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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. |
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Mon Dec 7 09:48:24 2009, Damien Gallop, , , OLIS development for CUSP source continued
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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, |
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Fri Dec 4 18:15:19 2009, Damien Gallop, , , OLIS development for CUSP source - gas lines & water
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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. |
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Fri Dec 4 09:58:08 2009, Damien Gallop, , , 20Ne1+ at 28keV for 8pi delivery complete
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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. |
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Thu Dec 3 14:12:56 2009, Damien Gallop, , , 20Ne1+ at 28keV for 8pi delivery continues
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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. |
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Wed Dec 2 19:03:55 2009, Damien Gallop, , , 20Ne1+ at 28keV for 8pi delivery
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| 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. |
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Tue Dec 1 12:33:58 2009, Damien Gallop, , , 20Ne1+ at 28keV for 8pi 8x
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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: |
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Tue Dec 1 09:27:17 2009, Damien Gallop, , , OLIS development for CUSP source - first overnight running
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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. |
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Mon Nov 30 16:53:31 2009, Damien Gallop, , , 20Ne1+ to 8pi planned for tomorrow
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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. |
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Mon Nov 30 15:41:00 2009, Damien Gallop, , , OLIS development for CUSP source - initial tests
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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. |
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Mon Nov 30 15:41:00 2009, Damien Gallop, , , OLIS development for CUSP source - initial tests
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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. |
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Fri Nov 27 13:36:09 2009, Damien Gallop, , , OLIS development for CUSP source - installation cont'd
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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. |
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Thu Nov 26 16:08:42 2009, Damien Gallop, , , OLIS development for CUSP source - installation cont'd
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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. |
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Thu Nov 26 06:22:58 2009, Keerthi Jayamanna, , , Cusp source
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| Arc power supply does not hold any voltage. |