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Folks,<br>
<br>
Please find the minutes below and at
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_19,_2015">https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_19,_2015</a>
.<br>
<br>
-- Mark<br>
__________________________________________<br>
<br>
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<h1 id="firstHeading" class="firstHeading" style="font-weight:
bold;" lang="en"><span dir="auto">GlueX Start Counter Meeting,
November 19, 2015, </span>Minutes</h1>
<div id="bodyContent" class="mw-body-content"><span
class="mw-headline" id="Minutes"></span>
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Present:</p>
<ul style="list-style-type: square;">
<li><b>FIU</b>: Werner Boeglin, Mahmoud Kamel</li>
<li><b>JLab</b>: Mark Ito (chair), Eric Pooser, Simon
Taylor, Beni Zihlmann</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Run_Readiness">Run Readiness</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We will operate the start counter as
usual during the upcoming run, even though the plastic
target will be downstream of the counter and the tracking
chambers will be off.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">The target/start-counter have been
retracted from the bore. When they are re-installed, Eric
will go though the Hot Checkout procedure. He did a
similar some weeks ago before the first insertion, at Tom
Carsten's request.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Calibration_Update">Calibration
Update</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mahmoud gave us an update on the
time-walk calibration plug-in that will be part of the<span
class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/Calibration_Challenge"
title="Calibration Challenge" style="color: rgb(85, 34,
0); padding: 0px !important; text-decoration: underline;
background: transparent;">Calibration Challenge</a>. See
his slides for the details.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">He has checked in the plug-in and
associated ROOT macros. The average resolution is about
270 ps. Sector 20 shows noticeably worse resolution and
indeed the time-walk function is not fitting the data very
well. Mahmoud will push ahead with other components of the
Calibration Challenge for now, but we may revisit the
procedure for time-walk calibration at a later date.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Asymmetry_in_Monte_Carlo">Asymmetry
in Monte Carlo</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mark showed a<span
class="Apple-converted-space"> </span><a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/talks/2015/st_hits_sim1.pdf"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">plot</a><span
class="Apple-converted-space"> </span>from Sean Dobbs
showing an asymmetry in the occupancy of the start counter
in recent Monte Carlo data. Simon told us there there is a
tilt to the start counter in the Monte Carlo and we
concluded that that is likely the cause.</p>
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