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<article id="node-1501971" class="node node-logentry article ia-n clearfix" role="article">
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<a href="https://logbooks.jlab.org/entry/4428907" rel="bookmark">RC Summary July 27 - July 28 Owl</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4428907" class="lognumber" data-lognumber="4428907">4428907</a>. Submitted by <a href="https://logbooks.jlab.org/user/schmidta">schmidta</a> on <time datetime="2025-07-28T08:49:53-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1753703393&end_date=1753710593&book=HBLOG">Mon, 07/28/2025 - 08:49</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2025-07-29T08:51:58-0400" pubdate="pubdate">Tue, 07/29/2025 - 08:51</time> </p>
<table class="field-vitals">
<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a></td></tr>
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<p>This is the RC summary for Day Shift July 27 through Owl shift July 28.</p>
<p>Yesterday day, we again suffered communications problems to the sector 2 HV for EC and LTCC (<a href="https://logbooks.jlab.org/entry/4428269">https://logbooks.jlab.org/entry/4428269</a>). Since the slow control system was reporting stale values that were in range, there were no alarms initially. The first sign of trouble was that the muon trigger (bits 19 and 22) rates dropped, and it took some investigating to figure out that this was a return of the comms problem. Nathan came in and we made two accesses in the afternoon, and replaced the crate's main board power supply module one HV card (slot 15) but that did not fully fix the problem. What did fix the problem was to disable LTCC HV in Sector 2 (giving us a hint that the board in slot 14 might be the culprit). For now we are running with the sector 2 LTCC HV disabled. See <a href="https://logbooks.jlab.org/entry/4428396">https://logbooks.jlab.org/entry/4428396</a> . We will discuss if we want to try a repair or leave things as is in today's RC meeting.</p>
<p>We resumed production running in swing shift, but beam was interrupted with a problem in a chiller cooling the south linac. We unfortunately had no beam until late owl shift. We resumed production running at that time. </p>
<p>- 7/27 day shift summary: <a href="https://logbooks.jlab.org/entry/4428149">https://logbooks.jlab.org/entry/4428149</a><br />
- 7/27 swing shift summary: <a href="https://logbooks.jlab.org/entry/4428412">https://logbooks.jlab.org/entry/4428412</a><br />
- 7/28 owl shift summary: <a href="https://logbooks.jlab.org/entry/4428660">https://logbooks.jlab.org/entry/4428660</a></p>
<p>Today, we will continue production running on He-4. In parallel, we will switch the deuterium bottle for the hydrogen bottle in preparation for hydrogen running tomorrow.</p>
<p>ABU for last 24h</p>
<p>- 9.6h of ABUs ~ 40% efficiency,</p>
<p>- Total ABUs since April 5th: 1227.3+9.6=1236.9 --> 1236.9 / (75.5 * 24) = 68.3%</p>
<p>- Day 114 of 151 scheduled: 114/151= 75.5%</p>
<p>- BANU: 2.9h due to access to work on EC HV, ATOF HV resets</p>
<p>Plan for today:<br />
* Production on He with 325nA</p>
<p>RC meeting:</p>
<p>We will meet as usual today at 11:30 (EST) in CH Room 200C and online via Zoom<br />
Zoom meeting ID: 160 570 5819<br />
Zoom Link: <a href="https://jlab-org.zoomgov.com/j/1605705819">https://jlab-org.zoomgov.com/j/1605705819</a></p>
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