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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,_July_1,_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 TOF Meeting, July 1, 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/5hlOh/">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>Next week the turn on of the GlueX detector will start
in earnest.
</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_TOF_Meeting,_June_17,_2020#Minutes"
title="GlueX TOF Meeting, June 17, 2020">the minutes
from June 17</a>. Sasha reports that the paperwork
from Hamamatsu shows that indeed 23 is the correct
number of PMTs ordered.
</p>
<h3><span class="mw-headline" id="New_PMTs_testing">New
PMTs testing</span></h3>
<p>Sasha presented <a rel="nofollow" class="external
text"
href="http://hadron.physics.fsu.edu/~ostrov/tof/20200701/">results
from testing the new PMTs</a>. He described the
preliminary tests, and the gain measurements using the
single photoelectron peak. Please see his webpage,
linked above, for the plots and a nice description and
discussion of his results.
</p>
<h3><span class="mw-headline" id="TOF_NIM_paper">TOF NIM
paper</span></h3>
<p>Sasha has complete three sections for the paper.
</p>
<ol>
<li> Testing done during the design phase. This has been
entered into Overleaf.</li>
<li> Tests done on components before construction.</li>
<li> Tests performed on the completed modules.</li>
</ol>
<p>He notes that there is some overlap with parts already
written by Paul and Beni and asked for advice on how to
proceed. We encouraged him to talk to the authors of the
sections in question and/or put the sections into the
complete paper to facilitate broader discussion of how
to resolve any conflicts.
</p>
<h3><span class="mw-headline"
id="Attenuation_lengths_in_Monte_Carlo">Attenuation
lengths in Monte Carlo</span></h3>
<p>Beni brought our attention to two related GitHub
issues, one <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/halld_sim/issues/128">on
the halld_sim site</a>, the other <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/159">on
the hdgeant4 site</a>. It appears that the wrong light
attenuation scheme is being used in hdgeant4 giving poor
agreement between data and simulation for energy
deposition, with the simulation giving a value a factor
of two too low. hdgeant(3) may also have pathologies.
Beni is actively working on straightening out the
situation.
</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> Start looking at the NIM paper as a whole. (all)</li>
<li> Continue work on the attenuation problem in Monte
Carlo (Beni)</li>
</ol>
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