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    User name R. Michaels

    Log entry time 01:30:46 on March16,2006

    Entry number 166865

    keyword=trigger timing mods

    R. Michaels, B. Sawatzky, R. Feuerbach

    Made the following timing mods:

    1. Add 40 nsec to the window of the RT circuit, this should
    increase the "head room" on the right side of D.bit3, which
    occurs when N-arm is early or BB is late.

    2. Increase the width of BB trigger (T2) by 20 nsec. It is
    now 100 nsec. This will increase the shoulder of randoms on
    left side of D.bit3. The issue with both points 1 & 2 is that
    true coincendces have an RMS of 40 nsec but the total T3 width
    was 80 nsec, a bit tight and making it hard to measure accidentals.

    3. The MWDC gate was moved again. We had done the right thing
    earlier today (halog 166842) as far as MWDC is concerned but it
    also affected N-arm, so we decided to take the BB-retimed signal
    from another source. The timing should not change much from
    halog 166842, but someone should check the TDCs on MWDC.