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User name jpchen
Log entry time 12:07:01 on October 08, 2009
Entry number 293830
This entry is a followup to: 293790
keyword=HP heater, ioc and cryo flow
When HP heater power was zero when beam on, temperature will fluctuate and
heater PID can not regulate (could not go negative). It probably was not
due to ioc problem. The problem probably was that there was not enough
cooling power: coolant supply temperature was high (~ 14 K instead
of < 13.5 K) and fluctuating.