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</style><article id="node-769820" 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/3696886" rel="bookmark">Sunday RC update for Hall C</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3696886/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3696886/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/3696886" class="lognumber" data-lognumber="3696886">3696886</a>. Submitted by <a href="https://logbooks.jlab.org/user/mack">mack</a> on <time datetime="2019-06-30T13:11:55-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1561911115&end_date=1561918315&book=ELOG">Sun, 06/30/2019 - 13:11</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/elog">ELOG</a></td></tr><tr><th>Entry Makers: </th><td>mack</td></tr></table></div>
<div class="logentry node-content">
<p>We're done with 3-pass. The 4-pass separation is in progress, along with some largely opportunistic 3C arc power supply work so we can get our beam energy measurement system back. (An email exchange errupted last nite after Sarin's post at <a href="https://logbooks.jlab.org/entry/3696646">https://logbooks.jlab.org/entry/3696646</a> . Steve Suhring pointed out we have another opportunity for opportunistic PS work on Monday if needed.) </p>
<p>Brad will have an RC meeting at 16:30 . Yesterday's meeting was surprisingly useful, and there's a big 4-pass program imminent. </p>
<p>Not so TMI follows:</p>
<p>SAT DAY shift - Finished one production kin setting, then made a major (but remote) kin change to start another, but SHMS Q3 would not<br />
respond to the requested ~1% decrease in current. After Markus tried everything to resolve it, we made some calls, were fairly patient, then<br />
asked for a controlled access to see what we could do at the PS controls. We decided to VERY carefully drop the DAC setting to the goal. Fortunately,<br />
Markus had no problem understanding the WTF menu. Steve L started watching our changes remotely at some point, and by the time we finished, Big NC Brother<br />
had reset the balky communications interface. Resumed production with significant beam off periods. See Markus's shift summary at <a href="https://logbooks.jlab.org/entry/3696454">https://logbooks.jlab.org/entry/3696454</a> </p>
<p>SAT SWING shift - Completed (e,e'pi) production, then switched to elastic coincidences. Stephen made some updates to the kinematics file, also<br />
changing the beam energy in the file to the "Mark Jones SHMS carbon elastic" value which trimmed most of the excess fat from the missing neutron mass.<br /><a href="https://logbooks.jlab.org/entry/3696628">https://logbooks.jlab.org/entry/3696628</a> See Stephen's shift summary at <a href="https://logbooks.jlab.org/entry/3696552">https://logbooks.jlab.org/entry/3696552</a> . </p>
<p>SUN OWL shift - After coin elastics, the SHMS polarity was reversed so singles p(e,e')p data could be taken. Beam off at the end of the shift for pass change.<br />
See Richard's to-die-for shift summary is at <a href="https://logbooks.jlab.org/entry/3696670">https://logbooks.jlab.org/entry/3696670</a> . </p>
<p>The last day was a complex program. What a great team.</p>
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