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<p>Colleagues,</p>
<p>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_22,_2016#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_September_22,_2016#Minutes</a>
.</p>
<p>You will want to go the wiki and click on the plots to be able to
see anything.<br>
</p>
<p> -- Mark<br>
</p>
______________<br>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Start Counter Meeting, September 22,
2016, </span><span class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b>FIU</b>: Mahmoud Kamel</li>
<li> <b>JLab</b>: Thomas Britton, Mark Ito (chair)</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/XxmiA/">recording of
this meeting</a> on the BlueJeans site.
</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_Start_Counter_Meeting,_August_26,_2016#Minutes"
title="GlueX Start Counter Meeting, August 26, 2016">the
minutes from the meeting on August 26</a>.
</p>
<p>Sean Dobbs contacted about the monitoring and
calibration plugins. Mahmoud needs the
new-data-format-capable branch from David to look at the
ADCs. He also needs new-format data to test changes.
</p>
<p>Mahmoud is working on Python scripts to do calibration
automatically, as Werner suggested last time.
</p>
<h3><span class="mw-headline" id="Run_Readiness">Run
Readiness</span></h3>
<p>Mark, Eric Pooser, Tom Carstens, and Stephanie
Worthington cabled up the start counter yesterday. The
strain relief was not fully hooked up. Today they will
do a test insertion and survey. The plan is to pull the
target/start counter again and fully apply the strain
relief on the cables.
</p>
<p>The next step after that is to take some data and
confirm the cables are connected properly.
</p>
<h3><span class="mw-headline"
id="Start_Counter_Efficiency">Start Counter Efficiency</span></h3>
<p>Mahmoud showed some slides on start counter efficiency.
Captions are for:
</p>
<ol>
<li> top left</li>
<li> top right</li>
<li> bottom left</li>
<li> bottom right</li>
</ol>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:SCHits.png"
class="image"><img alt="SCHits.png"
src="cid:part3.FA8E3362.D568FF1A@jlab.org"
srcset="/wiki/images/thumb/4/4a/SCHits.png/450px-SCHits.png
1.5x,
/wiki/images/thumb/4/4a/SCHits.png/600px-SCHits.png
2x" height="140" width="300"></a>
</p>
<ol>
<li> raw number of hits</li>
<li> difference between track projection and center of
counter</li>
<li> time difference between prediction from track and
start counter time</li>
<li> 2-D plot of the previous two</li>
</ol>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:EFF.png"
class="image"><img alt="EFF.png"
src="cid:part5.BEE113D6.5D87B431@jlab.org"
srcset="/wiki/images/thumb/2/2e/EFF.png/450px-EFF.png
1.5x, /wiki/images/thumb/2/2e/EFF.png/600px-EFF.png
2x" height="141" width="300"></a>
</p>
<ol>
<li> number of start counter hits (same as above)</li>
<li> same after cuts on delta t (2.5 ns) and delta phi
(18 degrees)</li>
<li> ratio of the two</li>
</ol>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Projected_SCHits.png"
class="image"><img alt="Projected SCHits.png"
src="cid:part7.F38AF9BC.F8D6087E@jlab.org"
srcset="/wiki/images/thumb/2/26/Projected_SCHits.png/450px-Projected_SCHits.png
1.5x,
/wiki/images/thumb/2/26/Projected_SCHits.png/600px-Projected_SCHits.png
2x" height="141" width="300"></a>
</p>
<ol>
<li> number of time a track projects to a counter</li>
<li> number of start counter hits in the sector with
cuts mentioned above</li>
<li> z distribution of track projections</li>
<li> track vertex z vs. z dist. of track projections</li>
</ol>
<p>This was work in progress. We spent quite a while on a
nice discussion of basic approaches to calculating
efficiencies. See the recording for details.
</p>
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