8:36 AM: Continuing from yesterday. The Helium bag is holding up well. We'll work on the electrometers first.
8:41AM: Electrometer #30 voltage can't be set with software. Set it manually to -300.
9:10 AM: Electrometer #30 and #27 let software set its range, but not voltage. The software communication actually set voltage back to zero. Reverting to Labview program version 1.5 doesn't make a difference.
9:24AM: It seem like a software problem. Any electrometer put on the first box of the electrometer page gets set correctly, and the second box gets its voltage set to zero. If we leave it as channel 3, the manually set voltage is not erased. We recall that the Labview source code was edited for Laval group visitors, but version 1.5 has a modification date of 2007. Stay tuned, investigation is ongoing.
9:33 AM: The -300V set by software seem to be wiped out in subsequent measurements in a scan, at least for software version 1.5a. We found out that besides Malcolm, only Fred seemed to have experience with Labview. We contacted him, and hope that he will find time to give us a hand today.
3:30PM: After Jugo's talk, we figured out what's wrong: the "monitor chamber" tab need to be set to "field chamber". The default is "transmission chamber". This is the root of our problem. After that, we took out Elekta chamber, Jan was having a discussion with Carl while Claudiu and I took the Elekta chamber out.
Experimental setup:
10s integration time.
York monitoring chamber at 2.5m, for Vickers control
8:41AM: Electrometer #30 voltage can't be set with software. Set it manually to -300.
9:10 AM: Electrometer #30 and #27 let software set its range, but not voltage. The software communication actually set voltage back to zero. Reverting to Labview program version 1.5 doesn't make a difference.
9:24AM: It seem like a software problem. Any electrometer put on the first box of the electrometer page gets set correctly, and the second box gets its voltage set to zero. If we leave it as channel 3, the manually set voltage is not erased. We recall that the Labview source code was edited for Laval group visitors, but version 1.5 has a modification date of 2007. Stay tuned, investigation is ongoing.
9:33 AM: The -300V set by software seem to be wiped out in subsequent measurements in a scan, at least for software version 1.5a. We found out that besides Malcolm, only Fred seemed to have experience with Labview. We contacted him, and hope that he will find time to give us a hand today.
3:30PM: After Jugo's talk, we figured out what's wrong: the "monitor chamber" tab need to be set to "field chamber". The default is "transmission chamber". This is the root of our problem. After that, we took out Elekta chamber, Jan was having a discussion with Carl while Claudiu and I took the Elekta chamber out.
Experimental setup:
10s integration time.
York monitoring chamber at 2.5m, for Vickers control
NE2581 as field monitoring chamber
A16 as scanning chamber
Film:
12 second beam time
York monitoring chamber at 2.5m
no other chamber used
7mm from bag metal edge to film
film not centered on dot.
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