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User name R. Michaels
Log entry time 01:19:43 on November 6,2009
Entry number 297700
keyword=scaler rate checks (75 uA)
L-HRS magnets set for P0 = 3.66 GeV. theta = 12.9 degrees.
I = 75 uA.
Observed rates in scalers:
T1 = 280 kHz
T2 = 5150 Hz ... usual T2
T3 = 57.5 kHz .. preshower group 4
T4 = 58 kHz .... shower group 4
T5 = 68.4 kHz .. sum preshower+shower group 4
T6 = 2100 Hz ... electron narrow
T7 = 287 kHz ... gas cherenkov
T8 = 1024 Hz (pulser)
T6 is very different from T1 or T7 which is moderately disturbing.
However, Kai tells me the program to align the signals has
not begun yet.
Note: T2/T1 = 1.8%. This implies a rough online inefficiency of
0.9% per plane for the scintillators, which is good and normal.
(Offline analysis cleanup typically reduces this inefficiency.)