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    User name R. Michaels

    Log entry time 20:46:40 on February 11, 2009

    Entry number 260549

    This entry is a followup to: 260534


    keyword=missing synch on L-HRS

    "missing synch" normally means some crate is missing a gate. It looks like ~2% of
    events are affected. One quick thing you can try is to run with unbuffered mode and
    see if it goes away (would be odd). Another thing to try is T8 events (low ps8), see if the
    rate of missing gates increases. Run pure T3 and see if the rate becomes negligble.
    In that case it's a "marginal timing" problem which I won't explain here. That's possibly
    dangerous. Depending on the outcome you then have a decision tree, e.g.
    (1) run unbuffered, (2) decide to live with it, (3) spend N hours trying to figure this
    out (N = ?, maybe 2 if lucky).

    A guess: it's still there unbuffered, was perhaps not noticed up to now, and is a "marginal
    timing" for events that don't have a normal scintillator retiming.

    I'm at home, and it's difficult to study this from here.

    A copy of this log entry has been emailed to: brads@jlab.org,vasulk@jlab.org