Problem pquest SNF 2012-08-03 16:37:45: PQuest bias voltage "jumping"; RF effect on He

jimkruger at snf.stanford.edu jimkruger at snf.stanford.edu
Fri Aug 3 16:37:45 PDT 2012


PQuest bias voltage "jumping".  It was mostly OK but someties droped to about half the expectted value.  This can be a symtom of a lost chip, fallen doen the dark-space shield.  Keep an eye on it and report.
One other user has verbally reported this recently.
The He backside flow is sometime jumping to eratic values once ther RF starts.  I believe the pre-RF value is good, so ignore  it after RF comes on until Elmer can take a look at the flowmeter shielding/RF grounding.




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