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    User name R. Michaels

    Log entry time 08:45:52 on February 21, 2011

    Entry number 347913

    This entry is a followup to: 347903

    keyword=re: double pulsing on LNE (helicity)

    We had this problem last Fall (multiple pulsing on LNE) and cleaned it
    up with a gate generator.  After that the probability became negligible.
    Then during the shutdown the circuit was largely disassembled.  I guess
    we should scrutinize the LNE and try to clean it up.  Might be a bad
    cable connector or bad module. The patch panel or patch cable is a
    suspect too.  Saturday night I did change the fanout module.  
    Note, we have some redundancy here.  In addition to the scaler/ring-buff
    there is the TIR data, which just passively looks at helicity signals.
    No LNE mechanism there.  As of Sat night those data looked good.
    Also it seems the double pulses are easy to eliminate and there are no
    missing real pulses, but then again until we see a result of analysis
    (like a physics asymmetry) we can't be completely comfortable.
    I'm at my office until ~1 pm if anyone wants to discuss it.

    A copy of this log entry has been emailed to: lselvy,vasulk,rom