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    User name V. Sulkosky

    Log entry time 18:41:45 on May 03, 2009

    Entry number 270675

    This entry is a followup to: 270660

    keyword=Left HRS Gas Cerenkov #6

    This behavior of this channel changing amplitude was first noticed before
    the end of Transversity. I attempted to fix it by switching delay
    cables, which did not work. I then switched the HV channel on the 1461N
    board for the gas Cerenkov. For d2n, we changed kinematics quite a bit,
    but sometimes we ran at the same kinematic for a few days. I was never
    informed of any issues with this channel during that experiment.

    It seems the changing amplitude has come back or maybe was never gone in
    the first place.

    It symptom appears to be a bad cable or connection somewhere. I do not
    believe that the PMT itself has a problem.

    Unfortunately when I attemnpted to check the problem before, the
    amplitude was normal. Someone would need some dedicated time during
    beam studies to track down the issue with this channel.

    A copy of this log entry has been emailed to: yawei,zhaobo,peter