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    User name hyde

    Log entry time 11:56:10 on October14,2010

    Entry number 334832

    Followups:

    keyword=HRS-DVCS trigger timing

    Output from DVCS trigger "HRS Singles" was counting at 7 MHz.
    Trigger output was fed to a NIM discriminator. Threshold was extremely low.
    Threshold set to 100 mV (1 V readback). Now rate is 1 Hz
    (programmed for S2m .and. S0)

    S2m and S0 signals into DVCS trigger widened to 80 ns (from 40 ns)

    S0 signal to DVCS trigger delayed by NIM disc propagation time (5 ns)
    S2m signal to DVCS trigger delayed by 15-20 ns cable delay.
    It should be possible to remove at least 10 ns of this delay, and
    still have the coincidence time S0.and.S2m from S2m.

    S2m and S0 sent to scope traces 2 and 3, respectively

    HRS S1 signal with T3 timing sent to Cerenkov cable
    (to scalers and TDC) channel 12
    S1 timing for T4 has additional 8 ns delay in Ldelay2 module

    HRS S2 signal with T3 timing sent to Cerenkov cable channel 16
    This has 64 ns delay relative to raw S2m trigger ( Ldelay1 ch1)
    S2m signal to T4 has additional 16 ns delay (parallel 80 ns in Ldelay2).
    Cerenkov signal to T4 has 64 ns delay (Ldelay2 ch3), relative to TDC
    (ch11).

    These S1, S2m TDC signals also sent to mezzanine scope channels 1, 2

    Charles, Hisham