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</style><article id="node-907803" class="node node-logentry contextual-links-region article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3834822" rel="bookmark">Status update</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3834822/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3834822/delete?destination=email/send">Delete</a></li></ul></div>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3834822" class="lognumber" data-lognumber="3834822">3834822</a>. Submitted by <a href="https://logbooks.jlab.org/user/sanghwa">sanghwa</a> on <time datetime="2020-08-26T10:56:10-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1598450170&end_date=1598457370&book=HALOG">Wed, 08/26/2020 - 10:56</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>Yesterday morning, we took controlled access to addressed the LHRS VDC noise issue (<a href="https://logbooks.jlab.org/entry/3834045">https://logbooks.jlab.org/entry/3834045</a>). No sign of the large noise since then. Beam was restored around 12, we took the Qsq measurement as planned (<a href="https://logbooks.jlab.org/entry/3834239">https://logbooks.jlab.org/entry/3834239</a>)</p>
<p>After the Qsq measurement, we went back to production mode but the septum magnet tripped multiple times. Decided to open the hall again around 4:30pm for visual inspection before it gets late, no smoking gun found at that point (<a href="https://logbooks.jlab.org/entry/3834378">https://logbooks.jlab.org/entry/3834378</a>) One potential culprit is the cooling water temperature which went up during the day and dropped by 15 deg in the evening. Septum hasn’t been tripped since the access. No further work in the hall is planned at this point.</p>
<p>We ran production when the beam was available. Collected ~1C from the owl (no production beam for swing). We had a bit of struggle to bring the Compton background rates down, MCC tried horizontal steering around the Compton and linac gang phase adjustment, only little success from the horizontal steering. The rates were mostly stayed at < 6.5k after the steering.</p>
<p>As of now, we are taking production data but the beam is quite trippy. PD informed us an hour ago that there will be a couple of hours downtime to look at 2L25 which is causing many trips. We will continue taking data as far as there is beam. </p>
<p>We will meet at 3:30pm for our daily experiment meeting: <a href="https://bluejeans.com/256205934">https://bluejeans.com/256205934</a></p>
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