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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,_April_16,_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, April 16, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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<p>Present: Rupesh Dotel, Tolga Erbora, Mark Ito, Simon
Taylor, Beni Zihlmann
</p>
<p>There is <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/us4VA/">a recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to gain access. </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 the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_April_2,_2020#Minutes"
title="GlueX Start Counter Meeting, April 2, 2020">minutes
from April 2</a> without significant comment.
</p>
<h3><span class="mw-headline"
id="Calibration_and_Efficiency">Calibration and
Efficiency</span></h3>
<p>Rupesh is working on documenting the calibration
procedures that he worked so hard to get going before it
fades from memory. He is also thinking about a plan for
doing some calibrations for the run just past at
appropriate intervals.
</p>
<h3><span class="mw-headline" id="Dark_Rate_Studies">Dark
Rate Studies</span></h3>
<p>Beni showed plot of the dark rate effects using a new
method. Rather using the result from FPGA-providided
pedestal measurement, he sums all of the data in the
readout window in raw mode to assess pedestal the
pedestal value. He has also changed the fit method.
Rather than just fitting the low-side of the pedestal
distribution to a Gaussian, he constrains the amplitude
and the position of the Gaussian peak to within a narrow
range around the peak of the pedestal distribution. He
showed two plots. On the left is the old method, and the
right the new.
</p>
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<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:Sctest_pedestals.png"
class="image"><img alt=""
src="https://halldweb.jlab.org/wiki/images/thumb/d/db/Sctest_pedestals.png/300px-Sctest_pedestals.png"
class="thumbimage" width="300"
height="188"></a>
<div class="thumbcaption">Old Method</div>
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<div class="thumb tright">
<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:Sctest_usesamples.png"
class="image"><img alt=""
src="https://halldweb.jlab.org/wiki/images/thumb/2/23/Sctest_usesamples.png/300px-Sctest_usesamples.png"
class="thumbimage" width="300"
height="188"></a>
<div class="thumbcaption">New Method</div>
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<p>We noted that even though the methods are quite a bit
different, the trendline and size of the effect are the
same.
</p>
<p>Tolga has been trying to reproduce Beni's result (old
method). He is ready to averate the results of the 30
start counter paddles got get a single plot.
</p>
<h3><span class="mw-headline" id="Actin_Item_Review">Actin
Item Review</span></h3>
<ol>
<li> Document calibration procedure (Rupesh)</li>
<li> Obtained calibrations for sub-periods of the recent
run. (Rupesh)</li>
<li> Reproduce Beni's dark current results. (Tolga)</li>
</ol>
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