<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Friends,<br>
<br>
Find the minutes below and at
<a class="moz-txt-link-freetext" href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_13,_2014">https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_13,_2014</a>
.<br>
<br>
-- Mark<br>
___________________________<br>
<br>
<div id="globalWrapper">
<div id="column-content">
<div id="content"> <br>
GlueX Start Counter Meeting, November 13, 2014<br>
<div id="bodyContent"><span class="mw-headline" id="Minutes">Minutes</span><br>
<br>
Present:
<br>
<ul>
<li> <b>FIU</b>: Werner Boeglin
</li>
<li> <b>JLab</b>: Fernando Barbosa, Mark Ito, Eric
Pooser, Beni Zihlmann
</li>
</ul>
<br>
<span class="mw-headline" id="Start_Counter_Tilt">Start
Counter Tilt</span><br>
<br>
Eric sent an email to Tim Whitlatch asking for survey
results. He recalls that the nose was tilted about 1.0-1.5
mm down. This was seen on the assembly jig at FIU. The ST
was surveyed on the target cart in the hall. We are seeing
higher rates at the top than the bottom of the array, by a
factor of 2.5.
<br>
This could be corrected in various ways, but for the current
run we agreed it was best to leave well enough alone. The
start counter will be mounted on the hydrogen target cart
for the Spring run; we should try to correct this tilt when
it is mounted on that cart.
<br>
<br>
<span class="mw-headline" id="TDC_Timing">TDC Timing</span><br>
<br>
We noted the need for a trigger signal somewhere in the
F1-TDC system. Beni reported that he has installed one in
the FDC TDC crate. That should allow us to correlation times
in the start counter with the rest of the detector.
<br>
<br>
<span class="mw-headline"
id="Monitoring_Histograms_and_More">Monitoring Histograms
and More</span><br>
<br>
Eric showed the <a
href="http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2605"
class="external text" rel="nofollow">plots he presented</a>
at Wednesday's Run Coordination Meeting. Things are looking
good. In particular he sees a good correlation between start
counter times and BCAL times as measured by the FADC-250s.
<br>
<div class="printfooter">
<br>
Retrieved from "<a
href="https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_13,_2014">https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_13,_2014</a>"</div>
</div>
</div>
</div>
<br>
</div>
<pre class="moz-signature" cols="72">--
Mark M. Ito, Jefferson Lab, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
</pre>
</body>
</html>