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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,_March_27,_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">Minutes, GlueX TOF Meeting, March 27, 2019</span></h1>
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<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Paul Eugenio</li>
<li> <b> JLab: </b> Thomas Britton, Mark Ito (chair),
Simon Taylor, Tim Whitlatch, Stephanie Worthington,
Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/QMKAn/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to access it. </p>
<h3><span class="mw-headline" id="Upgrade_Plan">Upgrade
Plan</span></h3>
<p>Stephanie showed some screen shots of the current
design, see below. She has been working on modifications
to the original STEP files sent from Ian Winger. Known
interferences have been addressed.
</p>
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<div class="thumb tright">
<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:48cm_arrangment_Full_Assembly-_DS.png"
class="image"><img alt=""
src="https://halldweb.jlab.org/wiki/images/thumb/e/e7/48cm_arrangment_Full_Assembly-_DS.png/300px-48cm_arrangment_Full_Assembly-_DS.png"
class="thumbimage" width="300"
height="187"></a>
<div class="thumbcaption">Upstream Layer</div>
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</div>
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<td>
<div class="thumb tright">
<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:48cm_arrangment_Full_Assembly-_DS.png"
class="image"><img alt=""
src="https://halldweb.jlab.org/wiki/images/thumb/e/e7/48cm_arrangment_Full_Assembly-_DS.png/300px-48cm_arrangment_Full_Assembly-_DS.png"
class="thumbimage" width="300"
height="187"></a>
<div class="thumbcaption">Downstream Layer</div>
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<td>
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<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:48cm_arrangment_Full_Assy-close_up.png"
class="image"><img alt=""
src="https://halldweb.jlab.org/wiki/images/thumb/6/6d/48cm_arrangment_Full_Assy-close_up.png/300px-48cm_arrangment_Full_Assy-close_up.png"
class="thumbimage" width="300"
height="187"></a>
<div class="thumbcaption">Close-up, one view</div>
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<div class="thumb tright">
<div class="thumbinner" style="width:302px;"><a
href="https://halldweb.jlab.org/wiki/index.php/File:48cm_arrangment_Full_Assy-close_up_Iso.png"
class="image"><img alt=""
src="https://halldweb.jlab.org/wiki/images/thumb/5/5e/48cm_arrangment_Full_Assy-close_up_Iso.png/300px-48cm_arrangment_Full_Assy-close_up_Iso.png"
class="thumbimage" width="300"
height="187"></a>
<div class="thumbcaption">Close-up, another
view</div>
</div>
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</tbody>
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<p>We discussed recent activities and next steps.
</p>
<ul>
<li> Holder brackets were adjusted. JLab ordered these
pieces for the original TOF.</li>
<li> Ian is doing a measurement on the mini-TOF to
confirm the 2-3/4" OD of the iron shields.</li>
<li> Paul would like to review the design from first
principles with the 2-3/4" dimension in mind (as
opposed to 3"). Tim cautioned that there is not much
space between the iron shields in the design as it
stands.</li>
<li> FSU will machine the PMT shields and collars as
they did for the original TOF.</li>
<li> Stephanie will send the latest design files to FSU.</li>
<li> There will be a two-foot gap between bolts used to
clamp the support beams together in the center of the
array. This has to be done to accommodate the new
light guide configuration. This should not cause a
problem with support of the counters.</li>
<li> We should order scintillator and light guide
material ASAP. These are on the critical path.</li>
<li> More tubes will be needed, but not at the beginning
of construction.</li>
<li> The written procedures have been pulled. Mark
Stevens is looking at them.</li>
<li> Stephanie mentioned that an assembly bracket[?]
needs redesign.</li>
</ul>
<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 rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_13,_2019#Minutes">the
minutes</a>.
</p>
<p>Beni and Ashley will visit the Hall to confirm that
there are sufficient spare channels on the current
electronics to accommodate the upgrade.
</p>
<h3><span class="mw-headline" id="TOF_ML">TOF ML</span></h3>
<p>Thomas showed </p>
<ol>
<li> <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/DocDB/0039/003953/001/TOF_slides.pdf">slides</a>
describing the Machine Learning system he is using on
the monitoring histograms and results from application
to the TOF. See his slides for the details. Some
highlights:</li>
</ol>
<ul>
<li> The final product will use inputs from histograms
for all detector subsystems as well as EPICS
variables.</li>
<li> He is using Keras with a TensorFlow backend.</li>
<li> He is using the Inception Network, and arrangement
of nodes that was developed specifically to do image
classification[?].</li>
<li> The results for the TOF are quite good: "Good"
accuracy of 99.4% with a 0.8% rate of false positives
and "Bad" accuracy of 90.9% with a 0.8% rate of false
positives.</li>
<li> Future work (from his slide):
<ul>
<li> Move to histogram values</li>
<li> Begin hooking up these nets with the super
network (the final product mentioned above)</li>
<li> Work it into the workflow in counting house</li>
</ul>
</li>
</ul>
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