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</style><article id="node-874604" 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/3801633" rel="bookmark">RC update for Hall C, Monday swing to Tuesday swing</a>
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</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3801633/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3801633/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/3801633" class="lognumber" data-lognumber="3801633">3801633</a>. Submitted by <a href="https://logbooks.jlab.org/user/mack">mack</a> on <time datetime="2020-03-10T19:49:09-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1583880549&end_date=1583887749&book=HCLOG">Tue, 03/10/2020 - 19:49</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr><tr><th>Entry Makers: </th><td>mack</td></tr></table></div>
<div class="logentry node-content">
<p>Monday OWL changed to longitudinal target production at 05:46, nominal HMS/SHMS -3.5/-3.4 GeV data with 3He target. </p>
<p> Cascade failures following a valve closure kept beam off for most of Tuesday DAY shift. </p>
<p> After the Tuesday RC meeting, the 1 hour "Be window background run" was completed. This changes the dominant scatterers in the SHMS from "Be windows + 3He target" to "Be windows + N2 at atmospheric pressure". Ironically, Zhiwen says the rate increased, perhaps a teachable moment in how thin the 3He target is. </p>
<p> Sylvester thought the scraping had returned on the 3He cell. <a href="https://logbooks.jlab.org/entry/3801476">https://logbooks.jlab.org/entry/3801476</a> Xiaochao had us move the beam spot by another 0.5 mm in the negative X direction. (Done in 0.1 mm steps.) Need more statistics, but there seems to be no scraping now. <a href="https://logbooks.jlab.org/entry/3801594">https://logbooks.jlab.org/entry/3801594</a> Jingyi has updated the nominal beam position on the paper sheet on the wall. <a href="https://logbooks.jlab.org/entry/3801590">https://logbooks.jlab.org/entry/3801590</a> </p>
<p> Resumed longitudinal target production at 05:46, nominal HMS/SHMS -3.5/-3.4 GeV data with 3He target. ONGOING AS OF TUE SWING </p>
<p> Let me know about any non-pivot work you'd like to take place during the March 13-20 down in Hall C. So far on the list we've got<br />
a 3He compressor checkout for the x > 1 experiment next year (Meekins/RadCon);<br />
a hopefully straightforward SHMS dipole PS relay replacement followed by testing (Lassiter/Segal);<br />
and an important SOLID detector test the scope of which is defined in the HClist <a href="http://devweb.acc.jlab.org/CSUEApps/hclist/task/1809">http://devweb.acc.jlab.org/CSUEApps/hclist/task/1809</a> (Malace et al).</p>
<p>(The pivot work has been planned in great detail. I just want a list of anything 'else' so we don't trip over ourselves, and so the next RC can brace himself for a week of cat herding.)</p>
<p> Don't forget the temporary instructions for shift members regarding SHMS dipole power supply : <a href="https://logbooks.jlab.org/entry/3800710">https://logbooks.jlab.org/entry/3800710</a> . </p>
<p> 4 target polarization measurements since Monday SWING: 54.3%, 52.0%, 58.6%, and 57.6%, all L. The latter too-good-to-be-true numbers triggered an effort on day shift to adjust the heaters until good convection was re-established.</p>
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