<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
Please find the notes below and at
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki-private/index.php/Hall_D_Staff_Meeting,_May_2,_2016">https://halldweb.jlab.org/wiki-private/index.php/Hall_D_Staff_Meeting,_May_2,_2016</a><br>
<pre class="moz-signature" cols="72">_________________________
</pre>
<div id="content" class="mw-body" role="main">
<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Hall D Staff Meeting, May 2, 2016</span></h1>
<div id="bodyContent" class="mw-body-content">
<div id="siteSub">From Gluex PRIVATE Wiki</div>
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<p>Present: Eugene Chudakov, Mark Dalton, Alexandre Deur,
Hovanes Egiyan, Sergey Furletov, Mark Ito, David Lawrence,
Paul Mattione, Lubomir Pentchev, Dmitry Romanov, Patrizia
Rossi, Justin Stevens, Simon Taylor, Tim Whitlatch, Zhenyu
Zhang, Beni Zihlmann
</p>
<div id="toc" class="toc">
<div id="toctitle">
<h2>Contents</h2>
</div>
<ul>
<li class="toclevel-1 tocsection-1"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Eugene"><span
class="tocnumber">1</span> <span class="toctext">Eugene</span></a></li>
<li class="toclevel-1 tocsection-2"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#David"><span
class="tocnumber">2</span> <span class="toctext">David</span></a></li>
<li class="toclevel-1 tocsection-3"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Sergey"><span
class="tocnumber">3</span> <span class="toctext">Sergey</span></a></li>
<li class="toclevel-1 tocsection-4"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Alexandre"><span
class="tocnumber">4</span> <span class="toctext">Alexandre</span></a></li>
<li class="toclevel-1 tocsection-5"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Simon"><span
class="tocnumber">5</span> <span class="toctext">Simon</span></a></li>
<li class="toclevel-1 tocsection-6"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Hovanes"><span
class="tocnumber">6</span> <span class="toctext">Hovanes</span></a></li>
<li class="toclevel-1 tocsection-7"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Dmitry"><span
class="tocnumber">7</span> <span class="toctext">Dmitry</span></a></li>
<li class="toclevel-1 tocsection-8"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Tim"><span
class="tocnumber">8</span> <span class="toctext">Tim</span></a></li>
<li class="toclevel-1 tocsection-9"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Mark_I."><span
class="tocnumber">9</span> <span class="toctext">Mark
I.</span></a></li>
<li class="toclevel-1 tocsection-10"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Mark_D."><span
class="tocnumber">10</span> <span class="toctext">Mark
D.</span></a></li>
<li class="toclevel-1 tocsection-11"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Beni"><span
class="tocnumber">11</span> <span class="toctext">Beni</span></a></li>
<li class="toclevel-1 tocsection-12"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Lubomir"><span
class="tocnumber">12</span> <span class="toctext">Lubomir</span></a></li>
<li class="toclevel-1 tocsection-13"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Paul"><span
class="tocnumber">13</span> <span class="toctext">Paul</span></a></li>
<li class="toclevel-1 tocsection-14"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Jane"><span
class="tocnumber">14</span> <span class="toctext">Jane</span></a></li>
<li class="toclevel-1 tocsection-15"><a
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&printable=yes#Justin"><span
class="tocnumber">15</span> <span class="toctext">Justin</span></a></li>
</ul>
</div>
<h2><span class="mw-headline" id="Eugene">Eugene</span></h2>
<ul>
<li> We had a successful run, the engineering phase is over,
official data-taking starts in the Fall.</li>
<li> Some issues to resolve:
<ul>
<li> which diamond radiator to use</li>
<li> understand trigger efficiency</li>
<li> TAC calibration, needs repeating</li>
<li> decision on B field value</li>
</ul>
</li>
<li> Schedule
<ul>
<li> Oct. 2016: 2 months</li>
<li> Spring 2017: duration depends on four-laser
operation and separation, uncertainty due to
Accelerator manpower concerns</li>
<li> Fall 2017: Hall D down unless stable 4-hall
operation achieved</li>
<li> Spring 2018: discussion started, GlueX
low-intensity period will not have run out. Lower
energy per pass. Opportunity for PrimEx commissioning.</li>
</ul>
</li>
<li> DIRC ready in 2017, first box
<ul>
<li> next one delayed until 2018, due to funding</li>
</ul>
</li>
<li> Nuclear Photoproduction Workshop
<ul>
<li> held last Thu. and Fri.</li>
<li> about 25 participants</li>
<li> 2 or 3 tasks suitable for GlueX</li>
<li> community exists to support the physics</li>
</ul>
</li>
<li> Open House
<ul>
<li> big crowds in Hall D</li>
<li> weather cooperated, not too good, not too bad</li>
</ul>
</li>
<li> Budget
<ul>
<li> fund for projects exist, few k$ level</li>
<li> priority: spares, improvements, developments</li>
<li> contact Eugene with proposals</li>
</ul>
</li>
<li> solenoid magnet
<ul>
<li> 2.5 months at 1200 A</li>
<li> one week at 1350 A
<ul>
<li> ended with trip of power supply, blown fuse</li>
<li> fuse for extra relays will be upgraded from 0.5
A to 1.0 A</li>
</ul>
</li>
<li> at 4 K for some time now, ice may form
<ul>
<li> could be a local heat sink</li>
<li> Cryo Group recommends staying at 4 K</li>
<li> will do test in August at 1350 A, if quench
then there is time to warm up magnet</li>
</ul>
</li>
</ul>
</li>
<li> Alexander Austregesilo, new post-doc, arriving today</li>
</ul>
<h2><span class="mw-headline" id="David">David</span></h2>
<ul>
<li> open house
<ul>
<li> attendance surpassed usual by factor of 2</li>
<li> route of buses changed, we were the first stop</li>
<li> bottleneck in Hall coming up stairs to platform</li>
<li> less time to prepare this time due to running</li>
<li> send suggestions/ideas for improvement to David</li>
</ul>
</li>
<li> level 3
<ul>
<li> gnarly problem being worked on</li>
</ul>
</li>
<li> some nodes reboot, will investigate</li>
<li> will get another raid disk, eliminate back pressure</li>
<li> CPP work, new post-doc to work with</li>
</ul>
<h2><span class="mw-headline" id="Sergey">Sergey</span></h2>
<ul>
<li> close to limit of DAQ rate, reserves mostly used</li>
<li> next frontier: network speed, only about 50% overhead
at present</li>
<li> writing to disk OK</li>
<li> Eugene: DAQ reliability an area for future work</li>
</ul>
<h2><span class="mw-headline" id="Alexandre">Alexandre</span></h2>
<ul>
<li> looking at beamline data, devolution[?]</li>
<li> last data set large, will only analyze samples</li>
<li> will look at TAC runs</li>
</ul>
<h2><span class="mw-headline" id="Simon">Simon</span></h2>
<ul>
<li> measuring cross sections
<ul>
<li> rho production, efficiency needs understanding</li>
<li> omega production using pi0 gamma channel,
statistics low, cross section about right, only a
factor of a few too low</li>
</ul>
</li>
<li> multi-photon survey
<ul>
<li> seeing particles we expect to see</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Hovanes">Hovanes</span></h2>
<ul>
<li> looking at beamline issues
<ul>
<li> collimator, goniometer, profiler, possible
radiation damage</li>
<li> data in archiver to mine, position stability from
collimator vs. profiler vs. BCMs</li>
</ul>
</li>
<li> controls for tagger microscope to be developed further</li>
<li> Eugene: beam parameters, focusing?
<ul>
<li> H: harp scans, Accelerator vs. Hall D,
inconsistent, suspect Acc problem</li>
</ul>
</li>
<li> Eugene: difference in transmission between Acc tunes?
<ul>
<li> Alexandre: will take a look at it</li>
</ul>
</li>
<li> collimator scan, need to fit the shape, tricky to
interpret</li>
</ul>
<h2><span class="mw-headline" id="Dmitry">Dmitry</span></h2>
<ul>
<li> Visit ends Thursday!</li>
<li> RCDB
<ul>
<li> now feature complete</li>
<li> preserved config files lost in the data stream</li>
<li> website API for next run</li>
<li> Sergey: successful effort, may ideas for use being
proposed</li>
</ul>
</li>
<li> CCDB
<ul>
<li> working on feature requests, mainly from Sean Dobbs</li>
<li> will release 1.07 before departure</li>
</ul>
</li>
<li> thinking about 3D event display with Mark</li>
</ul>
<h2><span class="mw-headline" id="Tim">Tim</span></h2>
<ul>
<li> lists have been created:
<ol>
<li> lesson learned</li>
<li> maintenance tasks</li>
<li> repair tasks</li>
<li> improvements</li>
</ol>
<ul>
<li> Eugene: remove ferrous materials near solenoid</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Mark_I.">Mark I.</span></h2>
<ul>
<li> Capture calibration procedures: TOF and Start Counter</li>
<li> review low-level data monitoring</li>
<li> No big offline software projects</li>
<li> physics analysis ideas</li>
</ul>
<h2><span class="mw-headline" id="Mark_D.">Mark D.</span></h2>
<ul>
<li> BCAL calibration work
<ul>
<li> w/ Will McGinley on clustering</li>
<li> w/ George Vasileidis on z-positions in BCAL and
cluster timing</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Beni">Beni</span></h2>
<ul>
<li> wagers $1 that magnet will not quench again</li>
<li> TOF calibrations caught up with Calibration Train
output from Sean</li>
<li> looking at energy calibration, done for double-ended
counters, single-ended still to do</li>
<li> wants to push NIM articles for TOF, tracking chambers</li>
<li> physics analysis idea: Bose-Einstein correlations</li>
</ul>
<h2><span class="mw-headline" id="Lubomir">Lubomir</span></h2>
<ul>
<li> working w/ Vlad Berdnikov on cathode gain calibration,
method converges, but application to data gives worse
resolution</li>
<li> best resolution seen so far with straight tracks,
calibration for tracking in magnetic field needs
improvement</li>
<li> working with Luke Robison on simulations of e+e-
signals</li>
<li> TRD
<ol>
<li> with prototype detector identified issues, making
plan for next steps
<ul>
<li> drift field too low for xenon, allows
recombination</li>
</ul>
</li>
<li> need to understand background on chambers, front
chamber especially
<ul>
<li> when including information from PS find issue
with ROCPS2 in mode 8</li>
<li> PS tiles show nice correspondence for some
runs, not all</li>
<li> Hall probe for PS jumped, 2.0 to 2.5 T
<ul>
<li> Eugene: look at photon endpoint in PS</li>
<li> Sergey: magnetic filed likely an EPICS
problem</li>
</ul>
</li>
</ul>
</li>
</ol>
</li>
</ul>
<h2><span class="mw-headline" id="Paul">Paul</span></h2>
<ul>
<li> GlueX Physics Workshop
<ul>
<li> focus on analysis</li>
<li> examples: omega spin density matrix, pi0 asymmetry</li>
<li> making skims for EventStore</li>
</ul>
</li>
<li> preparing main reconstruction launch</li>
<li> plan: efficiency study for trigger, detectors</li>
<li> CLAS work</li>
</ul>
<h2><span class="mw-headline" id="Jane">Jane</span></h2>
<ul>
<li> beam pi0 asymmetry
<ul>
<li> more runs analyzed</li>
<li> correction for randoms</li>
<li> run dependence seen</li>
<li> dE/dx condition lowered</li>
<li> polarization for 2 runs may be wrong</li>
</ul>
</li>
<li> systematics for pi0 and eta production
<ul>
<li> studying acceptance, see some bad block in FCAL</li>
</ul>
</li>
</ul>
<h2><span class="mw-headline" id="Justin">Justin</span></h2>
<ul>
<li> rho polarization
<ul>
<li> looking for run dependence</li>
</ul>
</li>
<li> event quality: study fraction of good trigger, noise
<ul>
<li> look at multiplicity of tracks, clusters</li>
<li> Eugene: FCAL and start counter trigger should be
examined for this</li>
</ul>
</li>
<li> DIRC
<ul>
<li> Stephanie and John Frye work on support structure,
optical box</li>
</ul>
</li>
</ul>
</div>
<div class="printfooter"> Retrieved from "<a dir="ltr"
href="https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&oldid=714">https://halldweb.jlab.org/wiki-private/index.php?title=Hall_D_Staff_Meeting,_May_2,_2016&oldid=714</a>"
</div>
</div>
</div>
<div id="footer" role="contentinfo">
<ul id="footer-info">
<li id="footer-info-lastmod"> This page was last modified on 3
May 2016, at 11:02.</li>
<li id="footer-info-viewcount">This page has been accessed once.</li>
</ul>
</div>
<pre class="moz-signature" cols="72">
--
<a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
</pre>
</body>
</html>