[Dsg-halla_ecal] [New Logentry] Follow-up Re: Follow-up Re: Follow-up Re: ECal heater test started

[jonesdc at jlab.org]

Logentry Text:
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The heater test is taking longer than expected. As of 2:30PM the aluminum front plates are in the 230-290 degC range. We expect they will need to be in the 260-290degC range to keep the crystals at 220 degC. The crystals are very slowly rising in temperature with the hot side in the 120-140degC range and the cooler end in the 75-105degC range. The light guides are in the 25 to 60degC range and the ambient temperature of the rear enclosure is 37 degC with the PMT HV on.
The VESDA system is starting to see particulate with several zones showing 2 bars. For context, at 5 bars it sends a notification to the fire safety team. At 15 bars the guards call the fire station and have trucks roll. 

I am going to power down the system now for the weekend now since it is now clear that it will take multiple days to complete. We will do a longer run next week so that we can get up to temperature.

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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4337021
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