<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 below and at</p>
<p>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_April_11,_2018#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_April_11,_2018#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, April 11, 2018, </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),
Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/yHTaf/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_March_28_meeting">Review
of minutes from the March 28 meeting</span></h3>
<p>We went over the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_March_28,_2018#Minutes"
title="GlueX TOF Meeting, March 28, 2018">minutes</a>.
</p>
<p>Sasha reported that he will finish the database of the
tested PMTs soon.
</p>
<h3><span class="mw-headline" id="Calibration_Status">Calibration
Status</span></h3>
<p>Beni is starting to turn back to calibrations. Some
runs done, but nothing new has been added to the
database.
</p>
<p>Going to an ADC read-out threshold of 160 has improved
the efficiency, but not as much as he had hoped,
although the efficiency for the half-width paddles has
improved dramatically. Resolution may have suffered, but
he has a suspicion that the increased width he sees in
the global time distribution may be due to
mis-calibration of individual channels.
</p>
<h3><span class="mw-headline"
id="Amplified_Base_Prototype">Amplified Base Prototype</span></h3>
<p>Since changing the ADC threshold, analysis shows
improvements for the prototype base channel. Individual
PMT widths look better (after walk correction). There is
a puzzle in that the comparison of mean-time
distributions between the test paddle and a nearby
part-of-the-regular-TOF paddle has the regular better
paddle with better resolution.
</p>
<h3><span class="mw-headline" id="TOF_threshold_scan">TOF
threshold scan</span></h3>
<p>Beni called our attention to the <a rel="nofollow"
class="external text"
href="https://logbooks.jlab.org/entry/3558658">log
entry</a> where he recorded the run numbers used the
ADC-threshold/NSA scan done a couple of weeks ago. The
thresholds were set at 150, 160, 170, and 180 ADC counts
(160 is the new normal) and NSA was set, for each
threshold, at 10 and 15. the data have yet to be
analyzed.
</p>
<p>Beni noted that 160 is still below the discriminator
threshold applied on the TDC side. If a pulse height of
168 or lower is seen in the ADC, the corresponding TDC
is generally absent.
</p>
<h3><span class="mw-headline" id="Action_Item_Recap">Action
Item Recap</span></h3>
<ol>
<li> Finish the PMT testing database. (Sasha)</li>
<li> Finish calibration of the post-threshold-change
data. (Beni)</li>
<li> Analyze the ADC-threshold/NSA scan data.</li>
</ol>
</div>
<div class="printfooter">
Retrieved from "<a dir="ltr"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_TOF_Meeting,_April_11,_2018&oldid=86346">https://halldweb.jlab.org/wiki/index.php?title=GlueX_TOF_Meeting,_April_11,_2018&oldid=86346</a>"</div>
</div>
</div>
</div>
<div id="footer" role="contentinfo">
<ul id="f-list">
<li id="lastmod"> This page was last modified on 11 April
2018, at 11:01.</li>
</ul>
</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>