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<p>Folks,</p>
<p>Please find the minutes below and <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_December_5,_2018#Minutes">here</a>.</p>
<p> -- Mark</p>
<p>___________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting, December 5, 2018, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Sasha Ostrovidov</li>
<li> <b> JLab: </b> Thomas Britton, Ashley Ernst, Mark
Ito (chair), Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a recording of this meeting on the <a
rel="nofollow" class="external text"
href="https://bluejeans.com/s/TEemj/">BlueJeans site</a>.
Use your JLab credentials to access it.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_November_7_meeting">Review
of minutes from the November 7 meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_November_7,_2018#Minutes"
title="GlueX TOF Meeting, November 7, 2018">the
minutes</a>. Ashley and Mark fixed her HDGeant4
problem that afternoon.
</p>
<h3><span class="mw-headline" id="Calibration_Status">Calibration
Status</span></h3>
<p>Ashley reported that she had calibrated 216 run from
Fall 2018, everything up to run 51734. The constants
have been entered into CCDB. There are only a small
number of runs left to do.
</p>
<p>She had a question about the proper Zihlmann-authored
script to use for CCDB entry. She will consult with Beni
about the details offline.
</p>
<h3><span class="mw-headline" id="Lucite_Shield_Geometry">Lucite
Shield Geometry</span></h3>
<p>Ashley reported that she has a complete geometry for
the shield ready to go. For details, see <a
href="https://halldweb.jlab.org/wiki/images/1/1a/Tof_shielding.pdf"
class="internal" title="Tof shielding.pdf">her slides</a>.
</p>
<ul>
<li> She met with Paul Eugenio to confirm the number
(one) and size (large) of the Lucite sheets that were
installed. This was confirmed with measurements she
and Beni performed in the Hall. The dimensions have
been rendered in the TOF HDDS XML file.</li>
<li> She found materials, already in HDDS, suitable for
modeling the shield.</li>
<li> She succeeded in visualizing the new geometry in
HDGeant4.</li>
<li> She will consult with Thomas on doing rate studies
using MCwrapper. The main goal is to reproduce the
rate reduction observed in the Hall.</li>
<li> After the meeting she and Mark put the new geometry
on a branch of hdds, namely "tof_shield_ace" and
pushed it to GitHub. They also built it successfully
on ifarm.</li>
</ul>
<h3><span class="mw-headline" id="Upgrade_Plan">Upgrade
Plan</span></h3>
<p>Paul was unable to attend but after the meeting sent <a
rel="nofollow" class="external text"
href="https://halldweb.jlab.org/talks/2018/TOF-Mod-Nov2018.pdf">slides
detailing his latest thinking</a> about the TOF
upgrade, including two options for geometry changes and
corresponding cost estimates. Sasha reported that rate
studies are underway and he sees a reduction of a factor
of two in the rate in the highest rate counters.
</p>
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