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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,_February_27,_2019#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">Minutes, GlueX TOF Meeting, February 27, 2019</span></h2>
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<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Sasha Ostrovidov</li>
<li> <b> JLab: </b> Thomas Britton, Mark Ito (chair),
Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/KyqSx/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to access it. </p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_February_13_meeting">Review
of minutes from the February 13 meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_February_13,_2019#Minutes"
title="GlueX TOF Meeting, February 13, 2019">the
minutes</a>.
</p>
<ul>
<li> Thomas did the ML training on Ashley's labeling. It
does well, though it could benefit from a larger
training sample for some low-probability cases. Still
it is 95 to 96% accurate. He will present some slides
next time.</li>
<li> The slides that Ashley Ernst showed at last week's
collaboration meeting on Richard's simulations of the
shield had received another iteration from Richard
beyond what was shown at the last meeting. Both
conditions were done without the DIRC[?].</li>
</ul>
<h3><span class="mw-headline" id="DIRC_.22Shielding.22">DIRC
"Shielding"</span></h3>
<p>Sasha showed <a
href="https://halldweb.jlab.org/wiki/images/7/7f/Tof-rates-dirc-nodirc.png"
class="internal" title="Tof-rates-dirc-nodirc.png">a
slide</a> where he plotted the ratio of scaler rates
in the horizontal TOF counters between two runs,
with-DIRC and before-DIRC, with-DIRC rates in the
numerator, before-DIRC in the denominator. Note that the
inner four counters had their HV turned of during the
with-DIRC run. The shadow of the DIRC is clearly
visible. He will be doing further studies to extend
these results.
</p>
<h3><span class="mw-headline" id="Upgrade_Plan">Upgrade
Plan</span></h3>
<p>Sasha reported that Paul Eugenio has been ordering
material for prototype light guides.
</p>
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