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GlueX'ers,<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,_September_10,_2015#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_September_10,_2015#Minutes</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,
September 10, 2015, </span>Minutes</h1>
<div id="bodyContent" class="mw-body-content"><span
class="mw-headline" id="Minutes"></span>
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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="Announcements">Announcements</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">The magnet will not be cold until
mid-January. If we do get some running in December it will
be with field off. We thought that for the start counter,
a lot of the calibrations we might do with beam could be
done under those conditions as long as background levels
were reasonable.</p>
<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 should start to look as cosmic ray
data to check the health of the start counter systems.</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;">Question from Sean: How much more
data is needed to perform all calibrations with beam data?
10 times? 100 times?</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Eric thought that based on his
experience with using one run, run 2931 (8 hours of data
taking, 75 M events), we would need about 20 times more
data to do a complete calibration.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="Review_of_minutes_from_the_previous_meeting">Review
of minutes from the previous meeting</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We looked at<span
class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_August_13,_2015#Minutes"
title="GlueX Start Counter Meeting, August 13, 2015"
style="color: rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">the
minutes from the August 13 meeting</a>.</p>
<ul style="list-style-type: square;">
<li>Eric continues to work on the calibration note. He is
also putting together a not on the start counter
construction and plans to revisit the start counter
section of the TCR.</li>
<li>The last release of sim-recon (1.5.1) does not include
that latest changes to the PID library and HDGeant.
Their effect has not yet been studied thoroughly. They
are present on the master branch.</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Efficiency_Update">Efficiency
Update</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mahmoud gave an update on his
efficiency studies. For all of the details see<span
class="Apple-converted-space"> </span><a rel="nofollow"
class="external text"
href="http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2800"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">his slides</a>. A few points
from his presentation:</p>
<ul style="list-style-type: square;">
<li>The problem with USE_SC_TIME has been resolved. The
numbers are much more reasonable now.</li>
<li>The overall efficiency is about 91%, but there are
still caveats.</li>
<li>There is a clear lack of efficiency at the tip of the
nose section. This may be due to tracking resolution.</li>
<li>He will look at the efficiency in finer bins in z. For
this presentation he looked at three regions: nose,
bend, and straight.</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Collaboration_Meeting">Collaboration
Meeting</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Eric and Mahmoud will get together
and plan a talk in the PID session.</p>
</div>
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