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    User name Parno / Franklin

    Log entry time 13:24:38 on February 23, 2009

    Entry number 262890

    This entry is a followup to: 260982

    keyword=New PMT/Base for Compton Photon Detector

    During today's access, we swapped out the PMT and base of the Compton photon detector (the GSO crystal). With the old base, we observed a significant gain shift (see HALOG #260982) that may have been rate-dependent. The new base, the homemade Mark V, is designed to have better performance at high rates and we hope that this will eliminate or vastly reduce the gain shifts.

    The maximum operating voltage of the new base is -2330 V, and it's optimized for running at -1800 V.

    A copy of this log entry has been emailed to: camsonne, nanda