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Message ID: 29     Entry time: Tue Jun 23 10:33:43 2009
Author: Damien Gallop 
Type: Routine 
Category: General 
Subject: Effects of RF on charge state 

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 the next while.

 

Effects of RF Parameters on 16O7+ Intensity
RF SP (GHz) Amplitude SP (dB) Power (W) FC6 (nA) Comments
15.4726 11.10 25 0.83 Starting values optimized
 15.4306  11.10 27 1.9 RF tolerance feels wider
 15.3624 10.8 19 0.85  
 14.3579  10.8  40  0.85  
 15.846  11  22 0 .75  
 15.477  10.6  32  1.75  Narrow
 15.4290  11  24  2.85  Tuner adjustment lost all gains so far
 15.4330  10.8  27  2.85  Seems resilient enough
 15.438  11  35  2.5  15.433 - 15.443 range. This is the keeper.

 Below is a stripchart of the beam (in blue; turquise is RF power) for the last three hours, of which the last 150 minutes are at the present settings. Pretty good, I'd say. I double-checked the range on the RF, and it's exactly the same as the start. Excellent. To round things out, here is a last emittance scan of 16O7+ before we move to 16O2+.

Attachment 1: grab.aS7166.png  22 kB  Uploaded Tue Jun 23 15:01:40 2009  | Show | Hide all
Attachment 2: grab.WZ7540.png  23 kB  Uploaded Tue Jun 23 15:40:06 2009  | Show | Hide all
Attachment 3: grab.Ku7550.png  16 kB  Uploaded Tue Jun 23 15:40:27 2009  | Show | Hide all
Attachment 4: grab.Pv7570.png  18 kB  Uploaded Tue Jun 23 15:42:08 2009  | Show | Hide all
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