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<article id="node-1523526" class="node node-logentry article ia-n clearfix" role="article">
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<h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/4450458" rel="bookmark">Hall B RC Summary 08/26/2025 (in progress)</a>
</h1>
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<div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4450458" class="lognumber" data-lognumber="4450458">4450458</a>. Submitted by <a href="https://logbooks.jlab.org/user/efuchey">efuchey</a> on <time datetime="2025-08-25T10:38:46-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1756129126&end_date=1756136326&book=HBLOG">Mon, 08/25/2025 - 10:38</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2025-08-26T09:21:55-0400" pubdate="pubdate">Tue, 08/26/2025 - 09:21</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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<div class="logentry node-content">
<p>Pass change had started earlier than expected due to Pass 3 separator trip, and took 2 hours total.</p>
<p>Initiated full beam recovery procedure at 9:45 after pass change done<br />
Torus polarity change completed by 11:00.</p>
<p>Harps scans from beam recovery procedure:<br />
To Tagger<br />
2C21A: <a href="https://logbooks.jlab.org/entry/4450469">https://logbooks.jlab.org/entry/4450469</a><br />
2C24A: <a href="https://logbooks.jlab.org/entry/4450484">https://logbooks.jlab.org/entry/4450484</a><br />
To Faraday Cup<br />
2C24A: <a href="https://logbooks.jlab.org/entry/4450522">https://logbooks.jlab.org/entry/4450522</a><br />
2H01: <a href="https://logbooks.jlab.org/entry/4450514">https://logbooks.jlab.org/entry/4450514</a></p>
<p>DAQ issue at 12:30 (~15 min down - but we were officially "off" anyway)<br />
Production resumed on 4He at 50nA at 13:30:</p>
<p>Target change 4He -> D2 at 22:15, during accelerator down (we only needed 10 extra min of BANU);<br />
Due to miscommunications (for which I share responsibility...), we took 1h data taking with AHDC OFF</p>
<p>Note: Yesterday was floated an idea to request pass change today at 4pm if things go incredibly well, but as if this morning, it has been determined not to be realistic *regardless of past incidient*.<br />
Current plan includes 2*8 ABU at 50 nA, 2*4 ABU at 100 nA, and 2 target changes at 2 hours a pop: that's 28 hours which at 100% efficiency (which we won't have althought we're not far off) and starting at 12pm yesterday (we started at 1:30pm...) would bring us to 4pm today. Not to mention Pass 3 separator was scheduled to be fixed on Wednesday.</p>
<p>Accelerator issues:<br />
* Accelerator officially "OFF" until 14:00: All beam recovery was made on "free beam"<br />
* After "Elf on the Shelf", "Rack in the Arc (dropped)": <a href="https://ace.jlab.org/dtm/incidents/16238">https://ace.jlab.org/dtm/incidents/16238</a> (16 min down)<br />
* 2L05 HV drop (2h down) <a href="https://ace.jlab.org/dtm/incidents/16255">https://ace.jlab.org/dtm/incidents/16255</a><br />
=> Target change to D2 at the same time</p>
<p>News from MCC:<br />
* Beam will go away tomorrow at 5:30 for maintenance day and M&O tour.<br />
* Hall B won't be part of M&O tour, but we have requested to go in restricted for the uRwell prototype installation.</p>
<p>RC meeting 11:30, in person at CH 200 or on zoom at <a href="https://jlab-org.zoomgov.com/j/1605705819">https://jlab-org.zoomgov.com/j/1605705819</a></p>
<p>Shift summaries:<br />
DAY: <a href="https://logbooks.jlab.org/entry/4450389">https://logbooks.jlab.org/entry/4450389</a><br />
SWING: <a href="https://logbooks.jlab.org/entry/4450660">https://logbooks.jlab.org/entry/4450660</a><br />
OWL: <a href="https://logbooks.jlab.org/entry/4450860">https://logbooks.jlab.org/entry/4450860</a></p>
<p>BTA from 8/24 8am to 8/25 8am:<br />
ABU: 911<br />
BANU: 71<br />
BNA+OFF: 458<br />
Logs:<br />
DAY: <a href="https://logbooks.jlab.org/entry/4450655">https://logbooks.jlab.org/entry/4450655</a><br />
SWING: <a href="https://logbooks.jlab.org/entry/4450844">https://logbooks.jlab.org/entry/4450844</a><br />
OWL: <a href="https://logbooks.jlab.org/entry/4451053">https://logbooks.jlab.org/entry/4451053</a></p>
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