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    User name grames

    Log entry time 16:08:19 on May 26, 2009

    Entry number 276605

    keyword=Hall A QE still good

    From my ELOG: 1471413:

    Hall A RC called about the reported low QE Measurement value ~0.001% from Owl shift concerned that this is an indicator of degraded polarization. I checked the Hall A QE by-hand and it is still good (0.14%), so we may continue running like this for another 1-2 days most likely. The "bad" measurement is just a result of hang-up's in the QE Measurement picoammeter readback giving "0".

    Data from measurement: atten=160, current=15.5uA, power=18.0mW => QE=0.14%, still OK.