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</style><article id="node-1140550" 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/4067514" rel="bookmark">RC Update (10/24/2022)</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4067514/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4067514/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/4067514" class="lognumber" data-lognumber="4067514">4067514</a>. Submitted by <a href="https://logbooks.jlab.org/user/mnycz">mnycz</a> on <time datetime="2022-10-24T10:02:57-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1666616577&end_date=1666623777&book=HALOG">Mon, 10/24/2022 - 10:02</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr><tr><th>Entry Makers: </th><td>mnycz</td></tr></table></div>
<div class="logentry node-content">
<p>After the turbo pump was changed by Jessie yesterday during SWING shift, we returned to Beam Permit, and began the beam and raster checkout.<br />
While we were down due to the vacuum work yesterday, the target group attempted an EPR measurement but there was an issue and the lock was lost, resulting in a reduction of the polarization. Since the hall was still in controlled access, the began a "spin up." More details can be found in: <a href="https://logbooks.jlab.org/entry/4066891">https://logbooks.jlab.org/entry/4066891</a><br />
The target computer was rebooted after becoming unresponsive: <a href="https://logbooks.jlab.org/entry/4066974">https://logbooks.jlab.org/entry/4066974</a><br />
While waiting for the polarization to increase, Simona began a checkout of the optics target to understand the cause of the ion chamber trips seen on 10/21/22, during a GEM luminosity scan.<br />
Afterwards, a check of the rates and comparison of the ion chambers for the polarized helium-3 cell with those during the calibration were made: <a href="https://logbooks.jlab.org/entry/4067352">https://logbooks.jlab.org/entry/4067352</a><br />
Production on polarized helium-3 was then started.<br />
5-aperture water flow faulted and brought down the accelerator for ~5 hours: <a href="https://logbooks.jlab.org/entry/4067389">https://logbooks.jlab.org/entry/4067389</a><br />
Resumed production on polarized helium-3. Due to the high data rate, and discussion with Bogdan, the BBCal thresholds were raised by 30% and the prescale for trigger 1 was set to -1 : (ps1=-1): <a href="https://logbooks.jlab.org/entry/4067485">https://logbooks.jlab.org/entry/4067485</a><br />
Let's meet at 3:00 pm<br />
Best Regards,<br />
Mike Nycz, Hall A RC<br />
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