[Dsg-halla_ecal] [Revised Logentry] ECal heater test status 5:15AM

[jonesdc at jlab.org]

Logentry Text:
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Now 13 supermodule zones have reached their control 290 degC setpoints. With each new zone reaching its setpoint and the control voltage/current load reducing as a result, the output on the remaining power supplies continues to increase providing strong evidence that the CRIO is not able to output sufficient current to maintain the voltage at 10V even to the 36 remaining zones that are plugged into PID control. It seems clear to me that this needs to be solved. We don't want the control voltage to be a limitation on our output. 
Crystal temperatures are much slower rising (attachments 3-4). Light guide temperatures are higher than I would have expected (attachments 5,6).

Robert Myles stopped by shortly after 5AM to see how things are going. He said he is not seeing anything on the VESDA readout at MCC yet. He checked the hall and said the odor was not bad. I told him we will continue as planned and will leave it to the discretion of the technicians as to whether or not we turn on the hall exhaust. It may be that just opening the roll-up doors will clear the odor sufficiently.

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