<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Folks,</p>
<p>Please find the minutes of our brief meeting below and at</p>
<p>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_December_6,_2017#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_December_6,_2017#Minutes</a>
.</p>
<p> -- Mark</p>
<p>__________________________</p>
<p>
</p>
<div id="globalWrapper">
<div id="column-content">
<div id="content" class="mw-body" role="main">
<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX TOF Meeting, December 6, 2017, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
<div id="bodyContent" class="mw-body-content">
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<p>Present:
</p>
<ul>
<li> <b>FSU</b>: Sasha Ostrovidov</li>
<li> <b>JLab</b>: Thomas Britton, Mark Ito (chair),
Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/UK@BG/">recording of
this meeting</a> on the BlueJeans site.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<p>Beni complete the Hot Check-Out for the TOF. We are
ready to go.
</p>
<h3><span class="mw-headline" id="PMT_Testing">PMT Testing</span></h3>
<p>Sascha reported that all 25 PMTs have gone through
single photo-electron testing. He showed <a
rel="nofollow" class="external text"
href="http://hadron.physics.fsu.edu/%7Eostrov/tof/20171206/">some
plots of results for selected tubes</a>. The
calculated gains track those supplied by Hamamatsu, but
the amount of variation from the Hamamatsu number is
about 25%. In the original batch of TOF PMTs, the
variation was more like 10%. There is also a (previously
noted) large variation in the yield of single-pe events
from tube to tube.
</p>
<p>The tubes will now go on to tests with an americium
source.
</p>
</div>
</div>
</div>
</div>
</div>
<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
</pre>
</body>
</html>