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Folks,<br>
<br>
Please find the minutes below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_5,_2015#Minutes">https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_5,_2015#Minutes</a>
.<br>
<br>
-- Mark<br>
_________________________________________________________<br>
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GlueX Start Counter Meeting, February 5, 2015<br>
<div id="bodyContent"><span class="mw-headline" id="Minutes">Minutes</span><br>
<ul>
<li> <b>FIU</b>: Werner Boeglin, Mahmoud Kamel
</li>
<li> <b>JLab</b>: Mark Ito (chair), Eric Pooser, Simon
Taylor, Beni Zihlmann
</li>
</ul>
<br>
<span class="mw-headline" id="Start_Counter_Re-Installation">Start
Counter Re-Installation</span><br>
<ul>
<li> Next week we will get a new flange for the target
cart to solve interference reported at the last meeting.
Re-assembly can start then.
</li>
<li> There is a plan to attache a 1.5 mm plastic target to
the nose of the start counter. It will be attached to
the light-tighting tape in some manner or another.
</li>
<li> Tim Whitlatch's plan is to evaluate any tilt once the
start counter is mounted on the target cart and then
evaluate if any further adjustment is necessary.
</li>
</ul>
<br>
<span class="mw-headline"
id="Matching_with_Charged_Tracks.2C_Etc.">Matching with
Charged Tracks, Etc.</span><br>
<br>
Simon led us through his recent <a
href="https://logbooks.jlab.org/entry/3318890"
class="external text" rel="nofollow">log book entry</a>.
<br>
<ul>
<li> There appears to be some sort of cabling or
translation transposition in two places in the start
counter. The azimuthal difference between the center of
a counter and the intersection point of a charged track
shows anomalies for counters 1 and 2 and for counters 21
and 22.
</li>
<li> He has rotated the start counter in the geometry.
This turns out to be a somewhat tedious exercise; it is
not simply a rotation of a single solid body. The tilt
is visible in the r-z distribution of intersection
points that he showed.
</li>
<li> The "fuzziness" noted last time in the nose region
was due to an overly wide azimuthal matching cut.
Improvement is marked. The more reasonable value has
been checked into the commissioning branch.
</li>
</ul>
<br>
<span class="mw-headline" id="Basic_Signal_Assessment">Basic
Signal Assessment</span><br>
<br>
We had some discussion on understanding and controlling our
thresholds, both for the FADCs and TDCs.
<br>
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