<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<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_13,_2019#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>_____________________________________</p>
<p>
</p>
<div id="globalWrapper">
<div id="column-content">
<div id="content" class="mw-body" role="main">
<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting Minutes, February 13, 2019</span></h2>
<div id="bodyContent" class="mw-body-content">
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
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 <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/oxwox/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to access it. </p>
<h3><span class="mw-headline"
id="Announcement:_Machine_Learning_and_the_TOF">Announcement:
Machine Learning and the TOF</span></h3>
<p>Thomas told us that ML-based online monitoring needs
experts to label histograms. He has conscripted Beni to
do so for the Time-of-Flight. The automatic system is
trained on PNG files from the online monitoring program.
It is doing well on the FCAL occupancy plots, with a
false positive rate of less than 2%. Colin Gleason did
the training for the FCAL in 20 to 30 minutes.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_January_30_meeting">Review
of minutes from the January 30 meeting</span></h3>
<p>We went over the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_30,_2019#Minutes"
title="GlueX TOF Meeting, January 30, 2019">minutes
from last time</a>.
</p>
<ul>
<li> Mark reported that Tim Whitlatch is going to <b>get
a designer</b> (probably Stephanie Worthington) <b>going
on Paul's upgrade ideas</b> sometime in the next few
weeks.</li>
<li> On Monday, Mark and Ashley made a <b>tagged
release of HDDS</b> with (a) the Lucite shielding,
(b) <b>no DIRC,</b> and (c) overlaps resolved. They
leveraged Richard Jones additions and corrections to
Ashley's initial draft of the shielding. The release
was produced by using version 3.13 as a base and
importing HDDS XML files from the CCDB for run 41000,
i. e., a pre-DIRC run.</li>
</ul>
<h3><span class="mw-headline" id="Lucite_Shield_Geometry">Lucite
Shield Geometry</span></h3>
<p>Ashley ran us through slides from Richard that detailed
his validation of the shield geometry. He identified and
performed three classes of verification (slide 4):
</p>
<ol>
<li> alignment verification (look at pictures)</li>
<li> geometry verification (checks proper embedding,
overlaps)</li>
<li> functional verification (run HDGeant4 and analyze
hits)</li>
</ol>
<p>Please see <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/talks/2019/tof_shielding_sim-2-2019.pdf">his
slides</a> for the details and the plots.
</p>
<p>Added in press: Ashley reported some clarifications she
obtained from Richard.
</p>
<ol>
<li> There is a swap in plot positions between the low
energy photon simulation. and the coherent
bremsstrahlung beam simulation. The former shows the
situation with shielding on the left and without
shielding on the left. The latter is the reverse.</li>
<li> The DIRC was present in all simulations.</li>
</ol>
</div>
<div class="printfooter">
Retrieved from "<a dir="ltr"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_TOF_Meeting,_February_13,_2019&oldid=91262">https://halldweb.jlab.org/wiki/index.php?title=GlueX_TOF_Meeting,_February_13,_2019&oldid=91262</a>"</div>
</div>
</div>
</div>
<div id="footer" role="contentinfo">
<ul id="f-list">
<li id="lastmod"> This page was last modified on 13 February
2019, at 12:34.</li>
</ul>
</div>
</div>
</body>
</html>