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

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User name brads

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

Entry number 261067

Followups:

261081 02/14/09 04:37 Jin Huang Target out of beam for Compton tuning
261082 02/14/09 04:38 D. Parno Card 11 Slot 1 is the Compton

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.