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    User name V. Sulkosky

    Log entry time 10:26:08 on May 13, 2009

    Entry number 272979

    This entry is a followup to: 272861

    keyword=Re: Right arm gas Cherenkov, Ch2 gain low?

    I checked the right gas Cherenkov channel 2 from the data taken last night.
    It is true that the gain is lower than it was. I checked a few runs from
    the Ay experiment including the last production run 21008. It seems
    that during the target change over that the gain has dropped about 15-20%.

    The HV on this PMT is already at -2.6 kV. I am not comfortable raising the
    HV higher considering the gain has recently dropped on it's own.

    A copy of this log entry has been emailed to: doug,riordan,bogdanw