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</style><article id="node-1105823" 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/4032789" rel="bookmark">RC Daily Summary August 22, 2022</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4032789/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4032789/delete?destination=email/send">Delete</a></li></ul></div>
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Lognumber <a href="https://logbooks.jlab.org/entry/4032789" class="lognumber" data-lognumber="4032789">4032789</a>. Submitted by <a href="https://logbooks.jlab.org/user/avakian">avakian</a> on <time datetime="2022-08-23T08:23:57-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1661253837&end_date=1661261037&book=HBLOG&book=ELOG">Tue, 08/23/2022 - 08:23</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2022-08-23T13:42:41-0400" pubdate="pubdate">Tue, 08/23/2022 - 13:42</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a> <a href="https://logbooks.jlab.org/book/elog">ELOG</a></td></tr><tr><th>Entry Makers: </th><td>avakian</td></tr></table></div>
<div class="logentry node-content">
<p>8/22 (Mon) 5-Pass Beam on NH3 Target (~50% polarization)<br />
Smooth data taking, starting from swing shift ~5PM<br />
Overall ABU ~10h, BANU ~0.5h Total number of events accumulated ~180M<br />
The trigger rates and the downstream halo rates increased by (~13%) compared to last night for the same beam current<br /><a href="https://logbooks.jlab.org/entry/4032641">https://logbooks.jlab.org/entry/4032641</a><br />
Comparison of monitoring plots seem to indicate that the change most likely is related to either beam or target. Possible improvements of the beam quality to mitigate the hall current spikes with some adjustments are listed in <a href="https://logbooks.jlab.org/entry/4032501">https://logbooks.jlab.org/entry/4032501</a><br />
In a longer term activities there is a plan to shield one of the viewers in the injector which may help to solve the problem completely, but it will take more down time, and current plan is to try that in the next SAD, or during/right after the winter break.<br />
If the increase of electrons is real, and not related to additional dilution from target, we should be able to measure the same asymmetries as before. We can check the beam quality when we come back after some downtime.</p>
<p>Plans for today: Continue with NH3 at 4nA. Change the HWP during the Swing shift, or any predictable beam down time.</p>
<p>We will have the daily RC meeting today at 2:00 PM:</p>
<p>RC Meeting Coordinates:<br /><a href="https://jlab-org.zoomgov.com/j/1608674253?pwd=SFZyYmZLWXJieGtpV2dEdVRiUE">https://jlab-org.zoomgov.com/j/1608674253?pwd=SFZyYmZLWXJieGtpV2dEdVRiUE</a>...<br />
Meeting ID: 160 867 4253<br />
Passcode: 786506</p>
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