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    User name R. Michaels

    Log entry time 11:34:32 on May28,2005

    Entry number 144755

    keyword=Triggers 6, 7, etc

    Set up the Aerogel triggers T6, T7. Similar to last year.
    First, about thresholds: The "knobs" one can imagine are
    1) discrim. threshold, 2) HV on PMT, and 3) gain knob on analog sum.
    Actually, only #3 was available.
    It was a little hard to judge the single p.e. peak, but I think
    they were, for gain=1, at:
    A1 at -75 mV (and this includes a baseline shift of -20 mV)
    A2 at -100 mV (baseline shift +20 mV).
    Since A2 was noisy with gain=1, I decided to put gains at
    A1 at 0.1 --> 30 mV is about 3 or 4 p.e. like last year.
    A2 at 0.5 --> 30 mV is slightly below 1 p.e.

    ** If another expert changes this, please note it !! **


    Trigger definition
    T6 = T3.and.A2.and.NOT.A1
    Scope Picture ................. Width ..... Delay to T3
    ---************--- A1 (veto) .. 125 ns .... 22 to 34 ns
    -************----- A2 ......... 120 ns .... 55 ns
    ------*****------- T3 ......... 55 ns ..... 0

    T7 = T5.and.T6 (formally, I could use T6.and.T1 but it was
    convenient to grab T5 which makes this equivalent).

    T6 and T7 are plugged into normalization scaler in the 16th and
    17th slot, which is like last year.