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User name R. Michaels
Log entry time 19:44:34 on July 03, 2010
Entry number 329777
This entry is a followup to: 329693
keyword=comments about CT*f4 in run 1552
Rates and such in run 1552
I = 3.5 - 4.0 uA
T1 = 757 kHz (too high ?)
T3 = 200 kHz
T4 randoms expected = R1*R3*60 nsec = 9 kHz for 30 nsec widths.
T4 observed rate = 31 kHz
Does not seem consistent with a flat observed CT*f4 spectrum. (* = 1,3)
However, as you approach MHz, typically electronics don't work well.
Also, the S/B goes like 1/I, so try I = 0.4 uA for coincidence search.
It would help a lot if someone could tell us quantitatively what
S/B to expect for (e- pi+).
A copy of this log entry has been emailed to: camsonne