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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_TOF_Meeting,_August_12,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p> </p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting, August 12, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Edmundo Barriga, Eugene Chudakov, Mark Ito
(chair), Sasha Ostrovidov, Simon Taylor, Beni Zihlmann </p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/e815xHbl3mo/">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_TOF_Meeting,_July_29,_2020#Minutes"
title="GlueX TOF Meeting, July 29, 2020">minutes from
July 29</a>. Beni reported that the hot channel in the
ADC scalers was some sort of DAQ glitch; it has since
calmed down. </p>
<h3><span class="mw-headline" id="Calibration_Anomaly">Calibration
Anomaly</span></h3>
<p>Sean Dobbs alerted Beni to a problem with the
calibration from the first part of the current run
(pre-COVID interruption) for paddle 18. The bottom PMT
of this paddle, PMT #63, has an anomalous time-walk
behavior (time difference between TDC and ADC vs. ADC
amplitude). See Beni's plots below. The top plot is from
run 71838 where the ADC was bad, the bottom from 71833,
before the problem appeared. Note also that in the top
plot the y-values have had their signs flipped
artificially; the difference from nominal is much
starker than the plot suggests on its face. This
degraded the calibration of the paddle. Unfortunately,
this problem, which was fixed by changing the FADC,
persisted for a not-insignificant number of runs and has
to be dealt with. Beni is looking into a fix. </p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Pmt63_run71838.gif"
class="image"><img alt="Pmt63 run71838.gif"
src="https://halldweb.jlab.org/wiki/images/thumb/c/c6/Pmt63_run71838.gif/600px-Pmt63_run71838.gif"
width="600" height="429"></a> </p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Pmt63_run71833.gif"
class="image"><img alt="Pmt63 run71833.gif"
src="https://halldweb.jlab.org/wiki/images/thumb/2/2f/Pmt63_run71833.gif/600px-Pmt63_run71833.gif"
width="600" height="429"></a> </p>
<h3><span class="mw-headline" id="TOF_NIM_paper">TOF NIM
paper</span></h3>
<p>We re-dedicated ourselves to the effort. </p>
<h3><span class="mw-headline" id="Action_Item_Recap">Action
Item Recap</span></h3>
<ol>
<li> Decide on when to ship PMTs to JLab from FSU (Mark,
Paul Eugenio)</li>
<li> Prepare a complete draft of the TOF NIM paper.
(all)</li>
<li> Paddle 18 re-calibration (Beni)</li>
</ol>
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