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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