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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,_July_9,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, July 9, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Rupesh Dotel, Tolga Erbora, Mark Ito (chair),
Susan Schadmand, Simon Taylor, Beni Zihlmann
</p>
<p>There is <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/67M04xOA9FW/">a
recording of this meeting</a> on the BlueJeans site.
Use your JLab credentials to gain access.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<p>Beni has turned on the start counter and taken a cosmic
ray run. I quick glance at the data showed the start
counter data missing, but this needs confirmation and
review of the DAQ configuration.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_last_meeting">Review of
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_25,_2020#Minutes"
title="GlueX Start Counter Meeting, June 25, 2020">the
minutes from June 25</a>.
</p>
<p>Fernando wrote a <a rel="nofollow" class="external
text"
href="https://mailman.jlab.org/pipermail/halld-pid/2020-June/001726.html">message
to the email list</a> on possible replacement of the
SiPMs. He thinks it is marginally easier to replace a
whole board rather than replacing individual SiPMs (12
per board). He also pointed out that we have a couple of
spare units in hand.
</p>
<p>Beni asked if the SiPMs are the same as those used for
the pair spectrometer. Mark will check.
</p>
<h3><span class="mw-headline" id="Run_Readiness">Run
Readiness</span></h3>
<p>Beni is getting ready to check signals and pedestals in
preparation for Hot Check-out and the run.
</p>
<h3><span class="mw-headline"
id="Calibration_and_Efficiency">Calibration and
Efficiency</span></h3>
<p>Werner Boeglin has asked Rupesh to look at the ADC
response of the start counter in light of the possible
degradation of timing resolution during the course of
the last run. We spent some time going over how this
might be done. Rupesh showed plots from a plugin that
Mahmoud Kamel pointed out to him that plots ADC spectra
for individual channels.
</p>
<h3><span class="mw-headline" id="Action_Item_Review">Action
Item Review</span></h3>
<ol>
<li> Document calibration procedure (Rupesh)</li>
<li> Reproduce Beni's dark current results. (Tolga)</li>
<li> Check status of the gain calibrations using
monitoring histograms. (Rupesh, Beni)</li>
<li> Revisit Yi's study of SiPM annealing. (Mark, Beni)</li>
<li> Ask about the current recommendation from SciComp
on copying files to the local disk from cache before
analyzing them. (Mark)</li>
<li> Look up type of SiPMs used in start counter. (Mark)</li>
</ol>
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