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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,_August_28,_2019#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>_________________________________________</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting, August 28, 2019</span><span
class="mw-headline" id="Minutes">, Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Sean Dobbs, Ashley Ernst, Paul
Eugenio, Sasha Ostrovidov</li>
<li> <b> JLab: </b> Mark Ito (chair), Simon Taylor,
Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/nX7DM/">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_last_meeting">Review of
minutes from the last meeting</span></h3>
<p>We reviewed the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_14,_2019#Minutes"
title="GlueX TOF Meeting, August 14, 2019">minutes of
the meeting on August 14</a> without significant
comment.
</p>
<h3><span class="mw-headline" id="Upgrade_Status">Upgrade
Status</span></h3>
<p>Paul gave the report.
</p>
<ul>
<li> Paul exchanged email with Tim Whitlatch. Tim
reports that all work on the frame in the Hall is
done. Paul is assuming that the bottom layer has been
re-assembled to be in the same state as when he left
to go back to FSU on the last trip (Mark will confirm
this state of things with Tim). Work was done to drill
and tap new holes in the frame and install the nylon
bolts that will act as stops against vertical sliding
of the modules.</li>
<li> All modules have been fabricated.</li>
<li> An extra bar or two have been made to act as
spares. Those still require testing.</li>
<li> The modules have been packed in their boxes and are
ready for transport.</li>
<li> The new beam box is being fabricated. The original
design from Tim and Stephanie Worthington has been
modified to be able to accommodate air light guides in
the future should we attempt such a modification.
There are two layers to the inner surface one of which
can be removed to provide access to the scintillator.
The new box is made of G10 and should be sturdier than
the one we used in the past.</li>
<li> Ian is working a new tool for gluing PMTs to light
guides in situ. It will not be used for the upcoming
installation but may be used if we have to replace
PMTs on the modules as mounted on the forward carriage
should the need arise.</li>
<li> The Lucite shield has not been fabricated yet. We
will wait until the TOF is installed in the Hall with
all of the cables and electronics checked out. As with
the previous version, this can be added later.</li>
<li> Paul sees a time line for transport and
installation as follows:
<ul>
<li> Arrive at JLab on a Wednesday</li>
<li> Install Wed., Thu., Fri. Spill into the weekend
if need be.</li>
<li> Be back as FSU on Tue. to teach his class.</li>
</ul>
</li>
<li> The installation should take a day if everything
goes well, thus contingency is built into this
schedule.</li>
<li> The only remaining question is which Wednesday. It
will be either September 4th or 11th (maybe the 18th).</li>
</ul>
<h3><span class="mw-headline" id="Software_Issues">Software
Issues</span></h3>
<p>Sean described the changes he has made on the
reconstruction software and related plug-ins. The new
code is designed to accommodate either the old TOF or
the new TOF geometry. It is on a new branch of
halld_recon: sdobbs_tof_hirecon_update. diffs with the
master can be found <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/halld_recon/compare/sdobbs_tof_hirecon_update">here</a>.
</p>
<ul>
<li> The DTOFGeometry class was refurbished to reflect
all relevant parameters from the HDDS XML input. The
XML will depend on the run number, thus the TOF
parameters can be used to determine which version of
the TOF is to be used in the code.
<ul>
<li> The parsing was updated</li>
<li> Values previously hard-coded are now served by
DTOFGeometry.</li>
</ul>
</li>
<li> Simple tests have been done and things look good.</li>
<li> Ashley is having some difficulties with the new
code in her tests having to do with obtaining
calibration constants from the CCDB.</li>
<li> Overall amount of work to create the "dual purpose"
code was not too bad.</li>
<li> Sean does not have a strong feeling about whether
the calibration code needs to be done in the
dual-purpose style or with a brand new set of code,
developed independently of the old calibration code.</li>
<li> The calibration constants are in tables which have
different dimensions for TOF I vs. TOF II and thus
must be retrieved from a different set of tables. The
constants being used for development now can be found
in the following file:</li>
</ul>
<pre>/work/halld/home/sdobbs/tof_upgrade_test/ccdb.sqlite
</pre>
<ul>
<li> Mark argued for having the new constants in a new
directory say TOF2, at the same level as the old TOF
directory in the CCDB. The current scheme has them in
a v2 sub-directory of TOF.</li>
</ul>
<h3><span class="mw-headline" id="Calibration">Calibration</span></h3>
<p>Beni pointed out that we need to do a new integral
non-linearity calibration of the CAEN TDCs. The new
channels of the TDCs, those put into play with the
upgrade, probably do not have even have a calibration.
</p>
<h3><span class="mw-headline" id="TOF_NIM_Paper">TOF NIM
Paper</span></h3>
<p>We reviewed the email from Beni announcing a <a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-pid/2019-August/001226.htmldraft/outline">version
of the TOF NIM paper</a> on Overleaf. We agreed this
was a good way to jump-start the effort and will feed
into the recently re-started effort by Elton Smith on a
GlueX detector NIM paper. Beni has declared a deadline
of December 1st for a complete first draft.
</p>
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