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<p>People,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_24,_2018#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, October 24, 2018, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> JLab: </b> Thomas Britton, Ashley Ernst, Mark
Ito (chair), Sasha Ostrovidov, 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/wblMK/">BlueJeans site</a>.
Use your JLab credentials to access it.
</p>
<h3><span class="mw-headline" id="Announcement">Announcement</span></h3>
<p>The JAG Tailgate Party is today from 3 pm to 6 pm on
the field behind the Residence Facility.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_October_10_meeting">Review
of minutes from the October 10 meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_10,_2018#Minutes"
title="GlueX TOF Meeting, October 10, 2018">the
minutes</a>.
</p>
<h4><span class="mw-headline"
id="Lucite_Shield_Simulation">Lucite Shield Simulation</span></h4>
<p>Thomas has transferred his knowledge on the HDDS
geometry of the Lucite shield to Ashley. The main
missing piece is the material definition. She has been
busy with the calibration but will start on this soon.
</p>
<h4><span class="mw-headline"
id="Particle_ID_Working_Group">Particle ID Working
Group</span></h4>
<p>Thomas has agreed to convene a meeting of the new
Particle Identification Working group. He will make an
announcement next week.
</p>
<h3><span class="mw-headline"
id="Two_current_issues_with_TOF">Two current issues
with TOF</span></h3>
<p>Beni and Sasha reported on a couple of areas of
concern.
</p>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://logbooks.jlab.org/entry/3613851">TOF
ADC config file</a>. Beni reported several channels
with FADC configuration/performance issues. See the
log entry for details.</li>
<li> <a rel="nofollow" class="external text"
href="http://128.186.19.133/%7Eostrov/tof/20181024/">Additional
info</a>. Sasha reports two problems: (1)
intermittent drop out of FADC scaler channels and (2)
strange baseline noise, intermittently on one of the
channels Beni flagged in his log message. See his
addendum to the Beni's log entry for details. Beni and
Ashley will look at the channel on a scope tomorrow
during the down time.</li>
</ul>
<h3><span class="mw-headline" id="Calibration_Status">Calibration
Status</span></h3>
<p>Ashley showed slides of mean-times[?] measured from a
recent run. She noted that there are a significant
number of channels where the fit does not converge. She
analyzed a run with four TOF skim files; Beni remarked
that she needs more events; he recommends using a run
with between 80 and 100 files.
</p>
<h3><span class="mw-headline"
id="Upgrade_Plan:_Option_.233">Upgrade Plan: Option #3</span></h3>
<p>Sasha reported that Paul has been thinking about
another option for re-configuring the inner region of
the TOF. This involves having per plane 4 half-length
counters (those that do not span the beam hole) of 3/4
width (4.5 cm wide) and 6 half-width counters (3.0 cm
wide). Outside of those. See figure below. This is
option #3. It has 4 more PMTs per plane than the current
array. Recall that option #2 has the same number of PMTs
as the current array. This option does have a problem
with accommodating the light guides for the three
consecutive half-width counters; Paul is working on
this. Sasha is planning to estimate rates for this
configuration as well.
</p>
<div class="center">
<div class="floatnone"><a
href="https://halldweb.jlab.org/wiki/index.php/File:Option3.jpg"
class="image" title="Option #3"><img alt="Option #3"
src="https://halldweb.jlab.org/wiki/images/thumb/6/6f/Option3.jpg/500px-Option3.jpg"
width="500" height="375"></a></div>
</div>
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<li id="lastmod"> This page was last modified on 24 October
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<pre class="moz-signature" cols="72">--
Mark Ito, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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