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    User name Ramesh/Dustin/ALex

    Log entry time 21:32:49 on August21,2009

    Entry number 285175

    keyword=HRS triggers ready

    We took controlled access to finish trigger timing issues. In both HRSs the retiming cable is just unplugged (not needed). All signals (Happex PMT, Prex PMTs, S0 PMTs) in both HRSs are well within the gate. Happex signals are centered inside the gate (perfect timing). In addition, all triggers in both HRSs are perfectly aligned to each other.

    Gate widths:
    LHRS: ADC and TDC gates each 250 ns wide
    RHRS: ADC gate is 400 ns wide while TDC gate is 250 ns wide.

    Any signal has more than 50 ns clearance from the falling edge of any gate.

    Trigger definitions are as follows:

    LHRS:

    T1: Happex signal
    T2: S0 front PMT signal ANDed with S0 back PMT signal
    T8: 1024 Hz clock

    RHRS:

    T1: Happex signal
    T2: S0 front PMT signal ANDed with S0 back PMT signal
    T3: Prex Stack PMT signal
    T8: 1024 Hz clock