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User name brads
Log entry time 12:31:45 on April 12, 2008
Entry number 231602
This entry is a followup to: 231579
keyword=He concentration followup
I should add that the error bar on the measurements is pretty large. For
example the ~500 ppm background level reading in the BigBite area
sometimes persisted even after I walked back to the tech computer area
(and gave the meter a few minutes to settle). Since I had zeroed the
meter at the tech computer that would indicate that the error on the 500
ppm measurement is something close to 500 ppm.
Jack also put a scope on 8 of the E plane PMTs to look for any signs of
afterpulsing. He said the signals all looked great.
I really doubt that the He leaking into the Hall from the BigBite
balloons and flange is significant compared to the Hall volume and LHe
leakage from the HRS magnets.