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User name R. Michaels
Log entry time 14:22:02 on June 7,2004
Entry number 124816
keyword=Triggers for HAPPEX
HAPPEX will occassionally use spectrometer DAQ, e.g. for optics.
The triggers have been set up:
T1 = R-arm scintillator S2 (note: S1 was removed)
T2 = R-arm HAPPEX electron calormeter. This is the "or" of 2 PMTs.
During Helium there is only 1 detector, in Hydrogen there will be 2.
T3 = L-arm scintillator S2 (note: S1 was removed)
T4 = L-arm HAPPEX e-cal
T5 = R-arm UMass/Smith Profile Scanner amplitude
T6 = L-arm UMass/Smith Profile Scanner amplitude.
In scalers we have new data where S1 used to be:
On page 1 of each arm we have
#1 = HAPPEX electron detector PMT#1
#3 = HAPPEX e- PMT2 (when it exists during Hydrogen)
#5 = UMass/Smith Profile Scanner amplitude.
(skipped 2,4 to reduce cross-talk in discrim.)
Since I used the S1 discrim. the detector map ordering is preserved
L-arm roc3, slot 25, chan 0+ for ADC (i.e. starting at 1st chan)
L-arm roc3, slot 3, chan 0+ for TDC
R-arm roc1, slot 25, chan 0+ for ADC
R-arm roc1, slot 16, chan 16+ for TDC
The X,Y of Profile Scanner will be plugged in somewhere later.
I noticed that with cosmics the T1/T3 rates were 2.4 kHz / 550 Hz.
That's rather high !! Cosmics will look crummy.