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<a href="https://logbooks.jlab.org/entry/4337021" rel="bookmark">Follow-up Re: Follow-up Re: Follow-up Re: ECal heater test started</a>
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Lognumber <a href="https://logbooks.jlab.org/entry/4337021" class="lognumber" data-lognumber="4337021">4337021</a>. Submitted by <a href="https://logbooks.jlab.org/user/jonesdc">jonesdc</a> on <time datetime="2025-03-07T14:52:36-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1741373556&end_date=1741380756&book=HALOG">Fri, 03/07/2025 - 14:52</a></time>. </p>
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<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr>
<tr><th>Entry Makers: </th><td>jonesdc</td></tr>
<tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/4336949">4336949 - Follow-up Re: Follow-up Re: ECal heater test started</a></td></tr>
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<p>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.<br />
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. </p>
<p>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.</p>
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