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</style><article id="node-1024125" 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/3951104" rel="bookmark">RC Update Nov 26, 2021</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3951104/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3951104/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/3951104" class="lognumber" data-lognumber="3951104">3951104</a>. Submitted by <a href="https://logbooks.jlab.org/user/xbai">xbai</a> on <time datetime="2021-11-26T14:48:35-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1637952515&end_date=1637959715&book=HALOG">Fri, 11/26/2021 - 14:48</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">
<pre><strong>Accelerator and Hall Status</strong><br />
We are cycling through HCal Calib run and production runs,
all detector study run were finished. Beam
is stable until the end of Thursday swing shift, roughly around 11:30 PM MCC had trouble to deliver 15 uA beam (10 uA Max).<br />Then the Hall A Moller Magnet failed at 3 AM during Friday OWL shift. See a MCC Log for this issue: https://logbooks.jlab.org/entry/3950911<br />, Optic experts developed a new beam optics plan to bypass this Moller Magnet, they said they've done this before.<br /> During the Friday Day shift, we mainly were establishing beam into Hall, David Flay is on remote support, see a log entry by David for this work: https://logbooks.jlab.org/entry/3951014<br />As of now, we have back to production run. <br /><br />There's one issue that needs to note is our trigger rate, there are a couple early production runs
where we set BBCal threshold to 400mV, this corresponds to 2 GeV energy cut in BBCal. But with this threshold we have around
8kHz trigger rate, and 42% live time. Data for these runs might have some
issue. We increased the threshold to 450mV to give DAQ ~90% live time.
There's a trigger configuration change, Brian and Alex suggested we
add HCal LED trigger, so starting from run 12318 (Swing shift) all the production runs
are using ps1=0, ps6=0, others = -1. Previously only ps1=0.
<strong>Pending and new Issues:</strong>
</pre><ul><li>GEM layer J0 common mode is drifting higher again, no progress on this</li><li>HODO scope HV issue: expert confirmed that this is not a hardware issue, see log: <a href="https://logbooks.jlab.org/entry/3950539" target="_blank">https://logbooks.jlab.org/entry/3950539</a> we are fine for experiment, but this may need to be fixed later. </li><li>Do we need to check BBCal calibration regarding the issue from trigger rate (8K at 400 mV, 2GeV)?</li><li>J0 Bottom chamber has APVs unstable, causing dead area in the chamber and also DAQ hung. need fix. These APVs are on INFN J0 fiber 17, 19. As of now, it seems this should not be a reason to stop beam and debug.</li></ul><pre><strong> Resolved Issues</strong><br />The troubling Moller Quad is bypassed. Hopefully we won't have any beam trip from now on.
<strong>Subsystems Update</strong>
Subsystem experts, please check data, if you find anything that needs to
be fixed, please let the RC know ASAP. <span style="text-decoration: underline;">At least please check the 50k replay results on HALOG see if your detector is fine.</span>
<strong>Run Plan</strong>
We will continue the production SBS-11 runplan as listed in this link: https://sbs.jlab.org/wiki/index.php/Main_Page</pre> </div>
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