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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_August_22,_2019#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>_________________________________________________________________</p>
<p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, August 22, 2019, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> JLab: </b> Rupesh Dotel, Mark Ito (chair),
Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/mKeiP">recording of this
meeting</a> on the BlueJeans site. Use your JLab
credentials to authenticate.
</p>
<h3><span class="mw-headline"
id="Review_minutes_from_the_last_meeting.5D.5D">Review
minutes from the last meeting]]</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_13,_2019#Minutes"
title="GlueX Start Counter Meeting, June 13, 2019">the
minutes of the meeting on June 13</a> without
significant comment.
</p>
<h3><span class="mw-headline" id="SiPM_Dark_Rate_Studies">SiPM
Dark Rate Studies</span></h3>
<p>Beni led us through his recent note, <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4138">GlueX-Doc-4138</a>.
Please see his note for all of the details.
</p>
<ul>
<li> Data was taken with beam off, sparsification turned
off (raw mode) using random triggers at 2 kHz. The
read-out window was set to 100 samples.</li>
<li> Average pedestal values for each set of four
samples in the window (25 measurements per event per
channel) are histogrammed and the low side of the
pedestal peak is fit to a Gaussian. Then the total
integral of the distribution is compared to the area
under the Gaussian. The ratio of Gaussian area to
total area is plotted for four data-taking runs
spanning the PrimEx run period.</li>
<li> There is a 5% decrease of the ratio over the course
of the run period.</li>
<li> Beni proposes that we make these measurements a
standard part of all future running. Rupesh
volunteered to oversee the operation including data
analysis.</li>
</ul>
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