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<article id="node-1524845" class="node node-logentry article ia-n clearfix" role="article">
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<a href="https://logbooks.jlab.org/entry/4451777" rel="bookmark">Re: RC Daily Summary August 27, 2025</a>
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Lognumber <a href="https://logbooks.jlab.org/entry/4451777" class="lognumber" data-lognumber="4451777">4451777</a>. Submitted by <a href="https://logbooks.jlab.org/user/ole">ole</a> on <time datetime="2025-08-27T10:52:39-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1756302759&end_date=1756309959&book=HCLOG">Wed, 08/27/2025 - 10:52</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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<p>Yesterday during DAY, accelerator carried out the Hall C Fast Feedback checkout, which went well (<a href="https://logbooks.jlab.org/entry/4451146">https://logbooks.jlab.org/entry/4451146</a>). In the early afternoon, Dave Mack did the BCM calibration (<a href="https://logbooks.jlab.org/entry/4451228">https://logbooks.jlab.org/entry/4451228</a>). Near the end of DAY, beam went away for about 3 hours to bring the repaired box power supply for Arc10 back online, which is required for sending beam to Hall D (<a href="https://logbooks.jlab.org/entry/4451265">https://logbooks.jlab.org/entry/4451265</a>). Accelerator had a minor problem during SWING, resulting in 2 hours without beam. Beam was turned off to all halls at 5:30 in the morning in preparation for today's maintenance day (<a href="https://logbooks.jlab.org/entry/4451693">https://logbooks.jlab.org/entry/4451693</a>). Because of these various events, we were only able to log 10 ABU hours over the last 24 hours (8am-8am)—42% efficiency. Nevertheless, we finished the z=0.50 pi+ theta_pq=2.0 kinematics mid-OWL, around 2am, and moved on to the last pi+ setting, z=0.36, for which we already have taken the LD2 SIDIS runs at full and half current.</p>
<p>Updates from accelerator:<br />
- Maintenance, beam studies, and RF recovery today. The task list is extensive. Beam is not expected back until 23:00 tonight.<br />
- Hall B pass change and Wien filter angle change tomorrow during DAY</p>
<p>Analysis updates:<br />
- Some recent z=0.50 pi- data, which turn out to be particularly important, were found to be unusable (thanks Peter Bosted for discovering this!) due to mysteriously misconfigured SHMS magnets (<a href="https://logbooks.jlab.org/entry/4451739">https://logbooks.jlab.org/entry/4451739</a>). It should be easy, albeit time-consuming (ca. 4 hours), to retake these data in the coming days as we will stay at 5-pass beam energy.</p>
<p>Hall status:<br />
- Restricted access for a tour this morning, until about noon.<br />
- 13:00-14:00 safety walkthrough<br />
- LAD decabling work (after tour complete).<br />
- Hall should be accessible until at least 15:00</p>
<p>Shift summaries:<br />
8/26 DAY: <a href="https://logbooks.jlab.org/entry/4451055">https://logbooks.jlab.org/entry/4451055</a><br />
8/26 SWING: <a href="https://logbooks.jlab.org/entry/4451475">https://logbooks.jlab.org/entry/4451475</a><br />
8/27 OWL: <a href="https://logbooks.jlab.org/entry/4451510">https://logbooks.jlab.org/entry/4451510</a></p>
<p>We will have the regular RC meeting at 2:30 pm today in the counting house conference room.<br />
Zoom link: <a href="https://jlab-org.zoomgov.com/j/1618227115?pwd=8JkhFg6YNesVc3HNgWjwUSIKIu5SvP.1">https://jlab-org.zoomgov.com/j/1618227115?pwd=8JkhFg6YNesVc3HNgWjwUSIKIu...</a><br />
Meeting ID: 161 822 7115<br />
Passcode: 253463<br />
Dial-in: 833 568 8864</p>
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