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    User name hyde

    Log entry time 13:13:36 on October 19, 2010

    Entry number 335644

    keyword=DVCS DAQ deadtime study

    S0 fanned out to S2m input to DVCS trigger S0 HV adjusted to adjust rate on S0

    T5 = triggers recorded (all events good??) T10 = HRS singles = S0.and.S2m

    seems to be a prescale of 1/2 betzeen S0 input to T2 and DVCS Trigger

    scalers are in analasys root file as left_t1c left_t2c etc

    The scalers do not seem to be initialiazed simultaneously I get intial value eg: T->Draw("left_t5c:Entry$","Entry$<100","")

    Run 7570 offset in t10c=318, offset in t5c=29 T->Draw("(left_t10c-318)/(left_t5c-29)","Entry$>100","") yields Deadtime correction factor = 1.069 +/- 0.004 T->Draw("1024*(left_t10c-318)/(left_t8c-7830)","Entry$>1000","") yields rate for run was 38.7 +/- 0.3 Hz

    Run 7562 HRS singles t10 rate = 112 +/ 1 Hz DTC = 1.217 +/- 0.02 (outlier clusters at 1.18 and 1.24)

    Run 7561 HRS singles t10 rate = 66.4 +/ 0.8 Hz DTC = 1.165 +/- 0.04 (outliers)






    Figure 1