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<p>Folks,</p>
<p>Please find the minutes for the meeting held before the
Collaboration Meeting <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_May_6,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting, May 6, 2020,</span><span
class="mw-headline" id="Agenda"> </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Mark Ito (chair), Susan Schadmand, Simon
Taylor, Beni Zihlmann
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/ALYRW/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to gain access.
</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_TOF_Meeting,_April_8,_2020#Minutes"
title="GlueX TOF Meeting, April 8, 2020">the minutes
from April 8</a>. Beni reported that the calibrations
for the last run period are completed now. Time
resolutions is close to 100 ps for all areas of TOF II.
</p>
<h3><span class="mw-headline" id="Calibration">Calibration</span></h3>
<p>Beni presented a study of charged track extrapolation
to the TOF array.
</p>
<p>Comparison between TOF survey data and tracking with
associated TOF points. The following plots shows
tracking data where the dimensions in x and y are the
track positions at the TOF plane based on extrapolating
the tracks all the way out to the TOF. The colored
shadings are the x/y position of the track at the TOF
with the color indicating which TOF paddle provided the
TOF point associated with the track. NO EXPLICIT TOF
DATA ENTERS HERE! The horizontal lines indicate the
location of the "nominal" TOF paddle positions. The
profile data is the mean track position of all tracks
along the paddles. AGAIN NO PADDLE DATA IS USED HERE
OTHER THAN YES THE PADDLE PROVIDED THE HIT! The three
large black dots indicate the location of the survey.
</p>
<p>Shown are the data for survey points 1,2 and 3 which
are along the horizontal axis between paddle 19 (last
3cm wide) and paddle 20 (first 4.5cm wide). These are
above the beam hole. Q indicate the charge of the
tracked particle.
</p>
<p>The survey points are shown in the following picture
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:TOFsurveypoints.jpg"
class="image"><img alt="TOFsurveypoints.jpg"
src="https://halldweb.jlab.org/wiki/images/thumb/b/b3/TOFsurveypoints.jpg/600px-TOFsurveypoints.jpg"
width="600" height="450"></a>
</p>
<p>The first two plots below show the data below the beam
line
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P19P20_Q1_run71673.gif"
class="image"><img alt="Survey P19P20 Q1 run71673.gif"
src="https://halldweb.jlab.org/wiki/images/4/4d/Survey_P19P20_Q1_run71673.gif"
width="898" height="574"></a>
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P19P20_Q-1_run71673.gif"
class="image"><img alt="Survey P19P20 Q-1
run71673.gif"
src="https://halldweb.jlab.org/wiki/images/b/be/Survey_P19P20_Q-1_run71673.gif"
width="898" height="574"></a>
</p>
<p>The second two plots below are data from above the beam
line
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P27P28_Q1_run71673.gif"
class="image"><img alt="Survey P27P28 Q1 run71673.gif"
src="https://halldweb.jlab.org/wiki/images/5/57/Survey_P27P28_Q1_run71673.gif"
width="898" height="574"></a>
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P27P28_Q-1_run71673.gif"
class="image"><img alt="Survey P27P28 Q-1
run71673.gif"
src="https://halldweb.jlab.org/wiki/images/c/c9/Survey_P27P28_Q-1_run71673.gif"
width="898" height="574"></a>
</p>
<p>The next two plots are data from far below the beam
line
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P7P8_Q1_run71673.gif"
class="image"><img alt="Survey P7P8 Q1 run71673.gif"
src="https://halldweb.jlab.org/wiki/images/f/fb/Survey_P7P8_Q1_run71673.gif"
width="898" height="574"></a>
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P7P8_Q-1_run71673.gif"
class="image"><img alt="Survey P7P8 Q-1 run71673.gif"
src="https://halldweb.jlab.org/wiki/images/6/67/Survey_P7P8_Q-1_run71673.gif"
width="898" height="574"></a>
</p>
<p>And last but not least the two plots with far above the
beam hole for both charges
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P39P40_Q1_run71673.gif"
class="image"><img alt="Survey P39P40 Q1 run71673.gif"
src="https://halldweb.jlab.org/wiki/images/3/32/Survey_P39P40_Q1_run71673.gif"
width="898" height="574"></a>
</p>
<p><a
href="https://halldweb.jlab.org/wiki/index.php/File:Survey_P39P40_Q-1_run71673.gif"
class="image"><img alt="Survey P39P40 Q-1
run71673.gif"
src="https://halldweb.jlab.org/wiki/images/f/f8/Survey_P39P40_Q-1_run71673.gif"
width="898" height="574"></a>
</p>
<p>Beni continues to try to understand the differences
between charged track extrapolation, survey data, and
the nominal TOF geometry. He will also compare with
similar studies for TOF I.
</p>
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