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    User name brads

    Log entry time 04:03:42 on February 14, 2009

    Entry number 261067


    keyword=The intermittant beamline HV alarm is due to card 11, chan 0 (Compton photon detector?)

    See Halog 256208 for what I think was triggering the alarms in mid-January.

    The current draw on card 11, ch 1 is pretty high (it's been up to 800uA while I've been watching it tonight). I think this might be for the Compton photon detector. Maybe the beam really sucks and it's pushing the PMT hard enough that the voltage droops tripping the alarm.

    Whoops, I just saw it alarm. Yup, that channel is the problem. If it is the Compton, then asking MCC to clean up the beam should help.