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User name M Friend
Log entry time 22:29:37 on November11,2009
Entry number 299041
keyword=Compton PMT gain shift with beam currentThe Compton photon detector changes gain with small changes in beam current. The Compton edge shifts from 2250 raus to 3250 raus with a change in beam current from 2uA to 5uA. This is related to the shift in PMT base current and is due to low energy background. We therefore cannot run at high current and cannot take Compton production data until the low energy background problem is fixed.
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