 Mon Aug 3 08:39:31 2009, Damien Gallop, , , MWS 21Ne -> 25Mg switchover 
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Conveniently scheduled for BC Day, we are preparing to switch over the MWS to sputter operation with MG source material. Operations has saved present
21Ne tune.
Later... Done! Source is relit with 21Ne beam on FC6. |
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Mon Jul 27 14:39:22 2009, Damien Gallop, , , 21Ne5+ to TUDA-II
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21Ne has been available from the MWS since mid-week. Here is roughly how last week unfolded to now:
Monday: MCIS -> MWS and remove MCIS cart
Tuesday: leakcheck MWS source gas manifold |
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Wed Jul 22 14:31:28 2009, Damien Gallop, , , 21Ne setup to TUDA-II is underway
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Last night Keerthi resolved the sparking issue in MWS and started the source while I was present. There was a frozen interlock condition ion IOS:BIAS,
which Graham resolved today. HV was on by ~11:00. Beam on FC6 immediately. It looks like Sophia took the beam at that point. I noticed that the Kepco appears
not regulating, and in any event is close to a limit (0.3A). I have asked Sophia for five minutes to reset it. |
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Wed Jul 22 01:33:29 2009, Damien Gallop, , , MWS initial startup summary
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Vacuum came down to ~7e-7 Torr. On startup, bias sparked over somewhere. Vacuum leak was caused. Later we found that HV had sparked through the source
gas tubing, which was touching the beamline frame. Obviously an arc had formed within the tube and sparked through on the ground side. We also could not
reset the bias interlock (ICR has efaulted this), so we ran in local. System is set up for 21Ne with about 28nA on FC6. Bias is off for the night, while |
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Tue Jul 21 17:11:33 2009, Damien Gallop, , , MWS preparations for 21Ne operation
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With the MCIS cart removed, Geoff hooked up the leak detector to the MWS source gas line. He did a couple of hours of leak checking in this mode. Then
he moved the connection to an empty gas port on the manifold itself. Much qicker responses. We replaced a VCR seal on the bottle side of the right-hand
He solenoid valve. That did wonders. He checked around afterwards, but found no further leak. We tidied up and opened the manifold to IOS. Base pressure |
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Mon Jul 20 17:28:01 2009, Damien Gallop, , , MCIS cart removed from cage and parked
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We discussed whether or not to leave the Supernanogan in the OLIS Faraday cage, and decided no, because the up-coming runs will use the MWS at 42 and
52kV respectively, higher than the MCIS HV rating. Bonus: We have more working room in the cage. The cart is out and parked. Services are connected and
up. |
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Mon Jul 20 09:25:35 2009, Damien Gallop, , , 18O4+ run to TIGRESS complete
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The 18O4+ run at about 5MeV/u ended this morning with reasonable success, I'm informed, despite MCIS vacuum trips, SC cryo trips and a power bump for
good measure.This morning I found beam at FC6 unstable. It appeared to be toggling between plasma states. A little tweak of a few MHz up in microwave frequency
not only stabilized it but also multiplied the brightness. Too bad the users didn't have this beam. Emittance scan in progress now. |
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Fri Jul 17 11:10:21 2009, Damien Gallop, , , Supernanogan development done 6x
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Beam switched back to 18O4+ by 11:00 as agreed. Some glitches. Here are snapshots of how it looked at handover time.
Later... Sophia prefers using all previously-saved files including ion source. Okay.
Note: For fun, Controls took away isacwserv mid-morning. The ICR did not communicate to them that I was the user... Workaround done with Keiko. |
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Fri Jul 17 10:46:06 2009, Damien Gallop, , , 16O6+ recheck
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| A/q = 2.666 Field = 767.1G FC6 = 3enA |
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Fri Jul 17 10:32:42 2009, Damien Gallop, , , 16O8+ recheck
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| A/q = 2 Field = 667.3 FC6 = ~10enA |
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Fri Jul 17 10:30:27 2009, Damien Gallop, , , 16O7+ recheck
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| A/q = 2.2857 Field = 710.5G FC6 = 100pA |
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Fri Jul 17 10:28:09 2009, Damien Gallop, , , 18O7+ recheck
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| A/q = 2.571 Field = 753.5 FC6 = 50epA |
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Fri Jul 17 10:03:07 2009, Damien Gallop, , , 18O6+ recheck
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A/q = 3 Field = 813.9G FC6 = 2.2enA
I tweaked the adjustment of the displayed A/q calibration to fit this one. |
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Fri Jul 17 09:47:16 2009, Damien Gallop, , , 18O8+ recheck
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Go fishing in the range 2.24-2.26, but no fish in this pond this time. However, there is a relatively strong beam at 2.3.
A/q = 2.3 Field = 711.2 FC6 = 110enA
No emittance scan possible. |
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Fri Jul 17 09:33:09 2009, Damien Gallop, , , Supernanogan epilogue
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There are the last couple of hours of Supernanogan Development for this set. Our run plan included 17On+ studies. Time will not permit it this time around.
Also, the emittance numbers of 16O and 18O are not distinctive enough as they stand to warrant studies of the in-between mass. Keerthi will run the emittance
data files through his software during post-analysis, and we'll develop our next run plan based on his conclusions. |
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Thu Jul 16 17:15:50 2009, Damien Gallop, , , 16/18On+ survey summary
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Here is a summary of emittances gleaned from the aforementioned elog entries.
A/q |
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Thu Jul 16 17:09:52 2009, Damien Gallop, , , 18O1+ survey
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| A/q = 18 Field = 1987.1 FC6 = 161nA |
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Thu Jul 16 17:05:29 2009, Damien Gallop, , , 16O1+ survey
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| A/q = 16 Field = 1873.4G FC6 = 204enA |
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Thu Jul 16 16:50:41 2009, Damien Gallop, , , 18O2+ survey
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| A/q = 9 Field = 1405.0G FC6 = 55enA |
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Thu Jul 16 16:40:11 2009, Damien Gallop, , , 16O2+ survey
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| A/q = 8 Field = 1324.8G FC6 = 172enA |