<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Starters,</p>
<p>Please find the minutes below and at <br>
</p>
<p>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_28,_2018#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_28,_2018#Minutes</a></p>
<p> -- Mark</p>
<p>_______________</p>
<p>
</p>
<div id="globalWrapper">
<div id="column-content">
<div id="content" class="mw-body" role="main">
<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, June 28, 2018</span></h1>
<div id="bodyContent" class="mw-body-content">
<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> FIU: </b> Werner Boeglin, Mahmoud Kamel</li>
<li> <b> FSU: </b> Sean Dobbs</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/oBXWF/%E2%80%8E">recording
of this meeting</a> on the <a rel="nofollow"
class="external text"
href="https://jlab.bluejeans.com/">BlueJeans site</a>.
Use your JLab credentials to authenticate.
</p>
<h3><span class="mw-headline"
id="Review_minutes_from_the_meeting_on_June_14">Review
minutes from the meeting on June 14</span></h3>
<p>Review of <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_14,_2018#Minutes"
title="GlueX Start Counter Meeting, June 14, 2018">the
minutes</a> was done without significant comment.
</p>
<h3><span class="mw-headline"
id="Propagation_Time_Corrections">Propagation Time
Corrections</span></h3>
<p>Mahmoud described a new method for obtaining the light
propagation time corrections. This approach fits
one-dimensional histograms of walk-corrected times where
each histogram comes from a bin in z (actually, length
along the counter). z-position is determined by charged
particles.
</p>
<p>For all of the details, please see <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/talks/2018/SC_Meeting06_28_2018.pdf">Mahmoud's
slides</a>.
</p>
<p>This method seems much more robust than the previously
tried fits to a two-dimensional histogram. The details
of the function used to smooth the bin-to-bin
fluctuations in the correction is still being developed.
</p>
<p>There was some discussion of whether the hits in the
forward-most bin, where the exact geometry of the
counters is uncertain, should ever be used in
reconstruction. We did not come to a conclusion about
this.
</p>
<h3><span class="mw-headline" id="World_Cup_Re-Cap">World
Cup Re-Cap</span></h3>
<p>Switzerland is through to the knock-out round. Egypt
did not make it. The US is absent from this year's
tournament on account of a heart-breaking loss to
Trinidad & Tobago.
</p>
<h3><span class="mw-headline"
id="Time-dependent_geometry_adjustments">Time-dependent
geometry adjustments</span></h3>
<p>Sean reported that work will resume after the
reconstruction launch lock-down is past.
</p>
<h3><span class="mw-headline" id="NIM_Paper">NIM Paper</span></h3>
<p>Werner reported that Eric Pooser has been busy with
software presentations lately and that work will resume
soon.
</p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>