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</style><article id="node-710407" 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/3637502" rel="bookmark">Bad pi0 distributions from online monitoring over weekend</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3637502/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3637502/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/3637502" class="lognumber" data-lognumber="3637502">3637502</a>. Submitted by <a href="https://logbooks.jlab.org/user/gleasonc">gleasonc</a> on <time datetime="2018-12-11T11:05:18-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1544540718&end_date=1544547918&book=HDFCAL">Tue, 12/11/2018 - 11:05</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2018-12-11T11:08:14-0500" pubdate="pubdate">Tue, 12/11/2018 - 11:08</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdfcal">HDFCAL</a></td></tr><tr><th>Entry Makers: </th><td>gleasonc</td></tr></table></div>
<div class="logentry node-content">
<p>I noticed there was a significant change in the pi0 mass distribution on Saturday afternoon (see plots below). Run 52429 looks normal. The next run, Run 52430 looks quite bad. There seems to be a lot fo events missing in the pi0 peak that are now shifted to a lower mass in addition to much more noise. Run 52430 was started at 15:38:05. Was this around when you changed to the new FCAL hv set points? I'm wondering if the increase in hv would have caused this noise to appear, or shift the pi0 peak to a lower value. Anyways, it might be worth good to have Ilya at this soon on a channel by channel basis.</p>
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<div class="attachment-box">
<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2018/12/3637502/Run052429.png" width="796" height="772" alt="" title="Run 52429" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2018/12/3637502/Run052430.png" width="796" height="772" alt="" title="Run 52430" /></div> </div>
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