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User name Ramesh/Diancheng
Log entry time 21:58:52 on October 31, 2009
Entry number 297075
keyword=Left HRS DAQ work
Besides explicitly rechecking T2, all triggers are working the way they
should and are also plugged in the normalization scaler. There are two
LeCroy scalers before the normalization scaler. After the normalization
scaler also there two scalers, the first of which has gas-cherenkov
signals in the ribbon cable in scaler ch0-15 and S1 signals in the
ribbon cable in scaler ch16-31, the second scaler has s2m left and
right PMT signls in its 32 channels.
ADC gate was set to be 300 ns wide so as to put the pion rejector
signal within the gate, whereas the TDC gate is kept only as 200 ns.
Some randomly chosen S1, S2m and pion rejector ADC signals were checked
and seen within the ADC gate.
Gas-cherenkov PMT #7 has low rate (~200 Hz) compared to other PMT like
#5 (400 Hz) and #9 (400 Hz).
S2m paddle left PMT #10 to #15 have the same type of signal with the
same rate, hence, we were not able to see any noisy PMT there (as Vince
was suggesting looking at the histogram, problem may be elsewhere).
In the PVDIS rack, veto signal is 50 ns earlier than the T1 signal. We
were not able to see a working veto today (plan to continue working
tomorrow morning). A cosmic run is underway overnight though.