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<article id="node-1456328" class="node node-logentry article ia-n clearfix" role="article">
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<a href="https://logbooks.jlab.org/entry/4383268" rel="bookmark">RC Report 25 May 2025</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4383268" class="lognumber" data-lognumber="4383268">4383268</a>. Submitted by <a href="https://logbooks.jlab.org/user/schmidta">schmidta</a> on <time datetime="2025-05-25T09:14:52-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1748175292&end_date=1748182492&book=HCLOG">Sun, 05/25/2025 - 09:14</a></time>. </p>
<table class="field-vitals">
<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr>
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<div class="logentry node-content">
<p>Yesterday, we resumed data taking. Not everything was running perfectly yet. The SHMS drift chamber 1 was unable to hold high voltage initially, likely because it needed more time to flush with Ar+CH3. Over time, the chamber recovered and by the middle of owl shift, it was up to full nominal HV again. (<a href="https://logbooks.jlab.org/entry/4383151">https://logbooks.jlab.org/entry/4383151</a>). </p>
<p>Unfortunately, we also found a problem with the forward-angle half of the far GEM, for which it appears that one trace has been severered, possibly during the GEM work conducted while we were down. (<a href="https://logbooks.jlab.org/entry/4382709">https://logbooks.jlab.org/entry/4382709</a>). Because of this problem, we decided to postpone any optics calibration with the carbon multi-foil target, since the entire purpose was to establish good GEM tracks. Fixing this will require and access, and the work is high-hazard. This will be done on Tuesday at the earliest. </p>
<p>GEM woes didn't end there. During swing shift, the GEMs started to cause problems for the DAQ. Initially, rebooting the MPD crate seemed to fix the issue (<a href="https://logbooks.jlab.org/entry/4382817">https://logbooks.jlab.org/entry/4382817</a>), but after further problems (<a href="https://logbooks.jlab.org/entry/4382867">https://logbooks.jlab.org/entry/4382867</a>), the far GEM was removed from the DAQ (<a href="https://logbooks.jlab.org/entry/4382963">https://logbooks.jlab.org/entry/4382963</a>), and then the GEMs were removed from the DAQ entirely (<a href="https://logbooks.jlab.org/entry/4382987">https://logbooks.jlab.org/entry/4382987</a>). </p>
<p>Without the GEMs, running overnight has been very smooth. </p>
<p>The question for the day is what can be done to bring the GEMs back online. For this reason, I would like to hold a short RC meeting at the usual time to make a plan.</p>
<p>SHIFT SUMMARIES:<br />
DAY -> <a href="https://logbooks.jlab.org/entry/4382511">https://logbooks.jlab.org/entry/4382511</a><br />
SWING -> <a href="https://logbooks.jlab.org/entry/4382760">https://logbooks.jlab.org/entry/4382760</a><br />
OWL -> <a href="https://logbooks.jlab.org/entry/4383229">https://logbooks.jlab.org/entry/4383229</a></p>
<p>RUN PLAN:<br />
We will continue production with D2, with single arm measurements once per day. Until we can do work to improve the GEMs, they will remain out of the trigger.</p>
<p>NOTES FOR SHIFT TAKERS:<br />
Don't forget to enter runs on the run list google sheet.</p>
<p>-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-<br />
We will have our regular RC meeting today at 2:30. I will be in person at the CH conference room, but feel free to join remotely. </p>
<p>Online information here -> <a href="https://logbooks.jlab.org/entry/4346862">https://logbooks.jlab.org/entry/4346862</a></p>
<p>More information will be filled on the wiki:</p>
<p><a href="https://hallcweb.jlab.org/wiki/index.php?title=May_25,_2025">https://hallcweb.jlab.org/wiki/index.php?title=May_25,_2025</a><br />
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<p>RUN LIST<br />
22720 - C-hole calibration<br />
22721 - Optics calibration (LAD was off) - 32 k events<br />
22722 - Production (partial GEMs, SHMS DC at low HV) - 3.7M events<br />
22723 - Production (partial GEMs, SHMS DC at low HV) - 4.7M events<br />
22724 - Production (partial GEMs, SHMS DC at low HV) - 3.5M events<br />
22725 - Production (partial GEMs, SHMS DC at low HV) - 3.0M events<br />
22726 - HMS single arm (3/4 trigger) - 1.2M events<br />
22727 - HMS single arm (Ereal) - 0.7M events<br />
22728 - Production (partial GEMs, SHMS DC at low HV) - 27K events<br />
22730 - Production (partial GEMs, SHMS DC at low HV) - 0.6M events<br />
22732 - Production (partial GEMs, SHMS DC at low HV) - 0.5M events<br />
22733 - Production (partial GEMs, SHMS DC at low HV) - 0.6M events<br />
22735 - Production (partial GEMs, SHMS DC at low HV) - 3.8M events<br />
22737 - Production (partial GEMs, SHMS DC at low HV) - 3.6M events<br />
22739 - Production (partial GEMs, SHMS DC at low HV) - 0.4M events<br />
22740 - Production (partial GEMs, SHMS DC at low HV) - 1.3M events<br />
22741 - Production (partial GEMs, SHMS DC at low HV) - 0.6M events<br />
22742 - Production (partial GEMs, SHMS DC at low HV) - 0.3M events<br />
22743 - Production (no GEMs, SHMS DC at low HV) - 3.8M events<br />
22744 - Production (no GEMs, SHMS DC at low HV) - 3.7M events<br />
22745 - Production (no GEMs, SHMS DC at low HV) - 3.8M events<br />
22746 - Production (no GEMs, SHMS DC at low HV) - 3.8M events<br />
22747 - Production (no GEMs) - 3.7M events<br />
22748 - Production (no GEMs) - 3.8M events<br />
22750 - Production (no GEMs) - 3.3M events<br />
22751 - Production (no GEMs) - 3.6M events<br />
22752 - Production (no GEMs) - 3.6M events<br />
22753 - SHMS Single Arm (3/4) - 0.5M events</p>
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