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Folks,<br>
<br>
Find the minutes below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_18,_2015#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_18,_2015#Minutes</a><br>
<br>
-- Mark<br>
___________________________________<br>
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<span dir="auto">GlueX TOF Meeting, March 18, 2015</span><span
class="mw-headline" id="Minutes">, Minutes</span><br>
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Present:
<br>
<ul>
<li> <b>FSU</b>: Paul Eugenio</li>
<li> <b>JLab</b>: Mark Ito (chair), Sasha Ostrovidov,
Beni Zihlmann</li>
<li> <b>NU</b>: Sean Dobbs</li>
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<span class="mw-headline" id="Calibration_Status">Calibration
Status</span><br>
<br>
Sasha showed <a rel="nofollow" class="external text"
href="http://hadron.physics.fsu.edu/%7Eostrov/tof/20150317/">plots</a>
illustrating one of the difficulties he is having with the
outer counters of the detector. For front-back
coincidences, he shows x determined by the known location
of the counter in the back plane vs x determined by time
difference in the front plane. For module 19 in the front,
near the middle of the array, the correlation is clear and
time difference easy to calibrate. For module 0 at the
edge the statistics are much less and there are a lot more
uncorrelated hits.
<br>
Sasha is still formulating a plan for calibration of the
short paddles. Since they are in the middle of the array,
their occupancy is high and calibrating them is important.
<br>
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<span class="mw-headline"
id="TOF_Reconstruction_Performance">TOF Reconstruction
Performance</span><br>
<br>
Sean showed some <a
href="https://halldweb.jlab.org/wiki/images/4/4b/TOF_Meeting_2015-03-17.pdf"
class="internal" title="TOF Meeting 2015-03-17.pdf">plots</a>
showing widely varying charged-track matching efficiency
with charged tracks for two nearby runs from the Fall run.
Even for the "good" run the match efficiency is not so
great. For the "bad" run, there are very few good TOF hits
from the hit factory to begin with. Beni thought that this
might be due to the entire time frame shifting between
runs due to trigger changes. If so it emphasizes the
importance of keeping track of trigger changes, especially
where the timing is affected.
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-- Mark M. Ito, Jefferson Lab, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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