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<p>Folks,</p>
<p>Please find the minutes below and at</p>
<p>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_July_12,_2018#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_July_12,_2018#Minutes</a></p>
<p> -- Mark</p>
<p>_________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Minutes, GlueX Start Counter Meeting, July 12,
2018</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),
Simon Taylor</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/gEBpE/%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_28">Review
minutes from the meeting on June 28</span></h3>
<p>We reviewed <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_June_28,_2018#Minutes"
title="GlueX Start Counter Meeting, June 28, 2018">
the minutes</a> without significant comment.
</p>
<h3><span class="mw-headline"
id="Propagation_Time_Corrections_and_Time_Resolution">Propagation
Time Corrections and Time Resolution</span></h3>
<p>Mahmoud presented his latest results, a refinement of
his results from last time. See <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/talks/2018/SC_Meeting07_12_2018.pdf">his
slides</a> for details and plots. His summary slide is
reproduced here:
</p>
<ul>
<li> New propagation time constants are obtained using
one dimensional fits (3-start-counter-z-region
constants) for 2017 & 2018 run periods.</li>
<li> 3-region and 4-region (with variable vertices) fits
were tested. There is no significant difference.</li>
<li> The time resolution from ST_Tresolution plugin,
where the RF time is determined based on the hit to
the SC, is calculated. This time resolution is better
by ~20ps than that calculated from the PT plugin.</li>
<li> Coming soon: Push the changes to github and the
constants to CCDB.</li>
</ul>
<p>There are still some checks to do; those should take
about a week on the farm. We suggested that he consult
with Sean Dobbs before putting these new constants into
the CCDB, especially since a reconstruction launch over
the 2017 data is imminent.
</p>
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<li id="lastmod"> This page was last modified on 13 July 2018,
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<pre class="moz-signature" cols="72">--
Mark Ito, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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