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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,_July_3,_2019#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>______________________________________________________</p>
<p>
</p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting, July 3, 2019, </span><span
class="mw-headline" id="Minutes">Minutes</span></h1>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Paul Eugenio, Sasha Ostrovidov</li>
<li> <b> JLab: </b> Fernando Barbosa, Eugene Chudakov,
Mark Ito (chair), Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/Ry4XE/">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 went over <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_June_19,_2019#Minutes"
title="GlueX TOF Meeting, June 19, 2019">the minutes
from the meeting on June 19</a>.
</p>
<ul>
<li> We re-agreed that we should use the scheme that
Fernando is proposing where the cables and labels
undergo minimum disruption in the Hall. The number
will have to be adjusted via the translations table
for the software to work.</li>
<li> Paul has asked Nick Sandoval and Chris Stanislav to
transfer channel labeling, currently present only on
the shields to corresponding positions on the frame.
The shields will be removed during the upgrade and
thus the label positions will be lost.</li>
<li> Fernando told us we are good on splitters in
response to Mark's question.</li>
<li> Fernando told us we have a spare TDC in response to
Beni's question.</li>
</ul>
<h3><span class="mw-headline"
id="Late_PMT_delivery_schedule">Late PMT delivery
schedule</span></h3>
<p>Mark reported that the PO for the additional 17 new
PMTs for the upgrade as issued has a delivery date of
October 25, too late for incorporation into new modules.
He spoke with Ardavan Ghassemi of Hamamatsu. Ardavan
will contact the factory and see if delivery can be
advanced, but it is very unlikely that the PMTs will
come early enough. From the discussion:
</p>
<ul>
<li> We have 25 new tubes in hand, all at FSU, plus some
spares. The new tubes were ordered to bring the FSU
supply to 48, the number of additional tubes needed
for the upgrade. So we are 23 tubes short.</li>
<li> The new plan is to use tubes from the current array
for the new modules. There are 40 tubes in the current
array that will come down when modules are replaced.
Paul will be traveling to JLab this month and will
remove them from their modules as installed in the
Hall. A manlift will be required. Radcon will have to
be contacted to survey the tubes before removal from
the Hall.</li>
</ul>
<p>Delivery of completed modules to JLab is still on track
for the end of July.
</p>
<h3><span class="mw-headline" id="Construction_Update">Construction
Update</span></h3>
<p>Paul gave us an update.
</p>
<ul>
<li> Light guide material ordered from one of the two
vendors we used showed reduced transmission in the UV,
despite assurances that the modules came from the same
manufacturer used by the other vendor. Paul showed
plots of transmission data that demonstrate the
effect. See the figures below. Additional material has
been ordered and the sub-standard light guides are
being remade.</li>
</ul>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:PastedGraphic-2.png"
class="image"><img alt="PastedGraphic-2.png"
src="https://halldweb.jlab.org/wiki/images/1/18/PastedGraphic-2.png"
width="320" height="94"></a>
</p>
<ul>
<li> The stock of ESR on-hand at FSU turned out to be
less than expected. Paul contacted 3M. They do not
sell ESR in the size we need (they sell small sheets,
not rolls) but Paul was able to find an engineer who,
after being told of the scientific value of our
project, donated a roll for our modules.</li>
<li> All of the scintillator is now wrapped with ESR.</li>
<li> The light guides are mostly made, polished, and
wrapped.</li>
<li> The gluing of light guides onto scintillator has
started.</li>
<li> PMTs have been attached on some modules.</li>
<li> A test of a complete module will be done next week.</li>
<li> There is a <a rel="nofollow" class="external text"
href="http://hadron.physics.fsu.edu/wiki/index.php/GlueX_Time-of-Flight#Time-of-Flight_Inner_Region_Upgrade">wiki
page at FSU (password required)</a> with information
on the upgrade. Here, for example, is a diagram of
where the various light-guides go.</li>
</ul>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:InnerModLayout.png"
class="image"><img alt="InnerModLayout.png"
src="https://halldweb.jlab.org/wiki/images/8/81/InnerModLayout.png"
width="1208" height="726"></a>
</p>
<ul>
<li> The shipping box has been designed and list of
materials drawn up. Paul will send the information to
Mark to get it ordered.</li>
<li> The new iron shields (8 of them) are in-house now
and will get primed and painted.</li>
<li> We need to follow up with Tim Whitlatch on the
status of the support brackets.</li>
</ul>
<h3><span class="mw-headline" id="TOF_Upgrade_Geometry">TOF
Upgrade Geometry</span></h3>
<p>Ashley had complete the new HDDS files for the upgraded
TOF. She has checked it in on the branch "tof_upgrade"
on <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/hdds">the HDDS
GitHub repository</a>. She showed <a
href="https://halldweb.jlab.org/wiki/images/6/66/Tof_upgrade.pdf"
class="internal" title="Tof upgrade.pdf">slides with
diagrams</a> containing all of the information needed
for the new geometry, all shown in contrast to the
analogous components of the old geometry.
</p>
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