Changed HP heater parameter to reduce false alarm

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User name jpchen

Log entry time 16:55:52 on September 2,2009

Entry number 287530

Followups:

287535 09/02/09 17:18 jpchen reduce parameter dE/dx further down

keyword=Changed HP heater parameter to reduce false alarm

When running 100 uA, cryotarget alarms every time when beam comes on and off. I checked that it is due to the beam compenpesation slightly over-compensate the beam power, which causes the HP heater power goes to over 1000 when beam comes off and goes to zero when beam comes on. I changed one parameter dE/dx from 4.8 to 4.0, it reduces the HP heater to be less than 1000 when beam off. Seems working that it reduces the false alarm.