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Message ID: 114     Entry time: Tue Aug 4 11:13:04 2009
Author: Damien Gallop 
Type:  
Category:  
Subject: MWS source tuning for 25Mg operation 

The source stayed up overnight just fine, with a little 25Mg beam on FC6. This morning I did a few mass scans to get a fix on Mg positions. Short story: There are some 3nA of 25Mg on FC6 presently, with things less than optimal. Stay tuned.

Attached is an early graph of Mg beams produced with the MWS almost exactly five years ago. Best I could find for now.

Later... Tuning went well. I ultimately had to tune in the ICR due to network response outside as people came in, etc. There are some 10nA of 25Mg on FC6 now, and the tune is set up for RFQ delivery. Snap: 090804_1240.snapiosfc6. I tweaked the upstream vertical steers slightly afterwards. The front-end differs from Rick's numbers by a bit, but it's necessary to keep down spills onto optics and get the beam through. I'll attach the differences below. Meanwhile, here are stripcharts of FC6 for the morning. In the latter part you can see where I turned down the microwave power from 600W to 500W. Slightly more than 500W seems about right for equilibrium. But to avoid boiling let's leave it at 500W for now.

A decent emittance scan is in the ISAC elog, albeit I ran it with slits closed down, so it should be repeated at some point with slits open.

Attachment 1: Mg_Series_from_OLIS.png  12 kB  | Show | Hide all
Attachment 2: grab.B21649.png  74 kB  Uploaded Tue Aug 4 13:55:44 2009  | Show | Hide all
Attachment 3: grab.M21682.png  113 kB  Uploaded Tue Aug 4 13:55:57 2009  | Show | Hide all
Attachment 4: grab.K21701.png  16 kB  Uploaded Tue Aug 4 13:57:24 2009  | Hide | Hide all
grab.K21701.png
Attachment 5: grab.D21705.png  11 kB  Uploaded Tue Aug 4 13:57:34 2009  | Show | Hide all
Attachment 6: grab.h21729.png  17 kB  Uploaded Tue Aug 4 13:58:57 2009  | Show | Hide all
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