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<p>Please find the minutes below and on the wiki at
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_June_27,_2017#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_June_27,_2017#Minutes</a>
.</p>
<p>______________</p>
<div id="mw-content-text" dir="ltr" class="mw-content-ltr" lang="en">
<h2><span class="mw-headline" id="Minutes">Minutes</span></h2>
<p>Present:
</p>
<ul>
<li> <b>FSU</b>: Sasha Ostrovidov</li>
<li> <b>JLab</b>: Thomas Britton, Brad Cannon, Mark Ito
(chair), Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/QyWwK/">recording of this
meeting</a> on the BlueJeans site.
</p>
<h3><span class="mw-headline" id="Event_Viewer">Event Viewer</span></h3>
<p>Thomas announced that the 3-D event viewer project is moving
ahead and encouraged us to think about how we would like to have
the TOF represented visually.
</p>
<h3><span class="mw-headline" id="New_Timewalk_Correction">New
Timewalk Correction</span></h3>
<ul>
<li> Beni checked one run with the new correction. There was a
problem with the reference paddle, but other than that the
correction does as well as the previous scheme.</li>
<li> If further checks look good, he will do a full
re-calibration of the Spring 2017 data.</li>
<li> The new scheme requires new tables to be loaded in the
CCDB.</li>
</ul>
<h3><span class="mw-headline" id="Energy_Calibration">Energy
Calibration</span></h3>
<ul>
<li> Brad has succeed in fitting peaks starting from Beni's ROOT
file.</li>
<li> He has also started the Monte Carlo needed to interpret the
energy in the peaks.</li>
<li> He is running into a ROOT, issue: the code crashes. He is
tracking it down.</li>
<li> There is one paddle with a MIP at 9000 counts in the
integral. Nominal is half that. Some of the outer counters did
have higher gain. He is studying whether we need to lower the
HV on this counter.</li>
</ul>
<h3><span class="mw-headline" id="TOF_Efficiency_Studies">TOF
Efficiency Studies</span></h3>
<ul>
<li> Beni has started looking at TOF efficiency as a function of
x-y over the face of the TOF.</li>
<li> For charged track that point to the TOF, he checks for a
corresponding TOF point.</li>
<li> He only starts to see efficiency problems for tracks with
momentum less than 1 GeV/c.</li>
</ul>
<h3><span class="mw-headline" id="PMT_Testing">PMT Testing</span></h3>
<p>Sasha reports that they have recruited students to do the
testing at FSU. They are currently struggling with a
non-cooperative Lecroy HV mainframe.
</p>
<h3><span class="mw-headline" id="NIM_Paper">NIM Paper</span></h3>
<p>Beni relayed Elton Smith's suggestion that we put the NIM paper
into the GlueX Document Git repository at <a rel="nofollow"
class="external free"
href="https://github.com/JeffersonLab/gluex_documents">https://github.com/JeffersonLab/gluex_documents</a>
.
</p>
</div>
<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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