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<p>Folks,</p>
<p>Pleas find the meeting page <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Software_Meeting,_July_7,_2020">here</a>
and below.</p>
<p> -- Mark</p>
<p>
</p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, June 16, 2020</span></h1>
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<p>HDGeant4 Meeting<br>
Tuesday, June 16, 2020<br>
3:00 pm EDT<br>
BlueJeans: <a rel="nofollow" class="external text"
href="https://bluejeans.com/968592007">968 592 007</a>
</p>
<div id="toc" class="toc">
<div id="toctitle">
<h2>Contents</h2>
</div>
</div>
</div>
<div id="toc" class="toc">
<ul>
<li class="toclevel-1 tocsection-1"><a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_16,_2020#Agenda"><span
class="tocnumber">1</span> <span class="toctext">Agenda</span></a></li>
<li class="toclevel-1 tocsection-2"><a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_16,_2020#Minutes"><span
class="tocnumber">2</span> <span class="toctext">Minutes</span></a>
<ul>
<li class="toclevel-2 tocsection-3"><a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_16,_2020#Review_of_minutes_from_the_last_Meeting"><span
class="tocnumber">2.1</span> <span class="toctext">Review
of minutes from the last Meeting</span></a></li>
<li class="toclevel-2 tocsection-4"><a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_16,_2020#Richard.27s_Action_Item_Review"><span
class="tocnumber">2.2</span> <span class="toctext">Richard's
Action Item Review</span></a></li>
<li class="toclevel-2 tocsection-5"><a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_16,_2020#Action_Item_Review"><span
class="tocnumber">2.3</span> <span class="toctext">Action
Item Review</span></a></li>
</ul>
</li>
</ul>
</div>
<h2><span class="mw-headline" id="Agenda">Agenda</span></h2>
<ol>
<li> Review of <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_2,_2020#Minutes"
title="HDGeant4 Meeting, June 2, 2020">minutes from the last
Meeting</a> (all)</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues">Issues
on GitHub</a></li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/pulls">Pull
Requests on GitHub</a></li>
<li> Action Item Review
<ol>
<li> preparations to advance to latest Geant4 release G4.10.06</li>
<li> 20% reduction in cpu time from recent fix to tracking</li>
<li> investigation of the multi-threaded bcal photon gun
anomaly</li>
<li> investigation of the backward kaon efficiency step at 120
degrees</li>
<li> new HDGeant4 branch "bcal_nolight_heavy_rtj" for
suppressing scintillation by heavy particles in the bcal</li>
<li> <i>yet to come</i> - investigation of the 12% drop in
preselection efficiency with CUTS card seen by George in
etaprime,p</li>
</ol>
</li>
</ol>
<h2><span class="mw-headline" id="Minutes">Minutes</span></h2>
<p>Present: Sean Dobbs, Sergey Furletov, Colin Gleason, Mark Ito
(chair), Igal Jaegle, Naomi Jarvis, Richard Jones, Susan
Schadmand, Simon Taylor, Nilanga Wickramaarachchi, Beni Zihlmann
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/WxqtP/">recording of this meeting</a>
on the BlueJeans site. Use your JLab credentials to get access.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_last_Meeting">Review of minutes
from the last Meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_2,_2020#Minutes"
title="HDGeant4 Meeting, June 2, 2020">the minutes from June 2</a>.
</p>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/152">Issue
#152</a>: BCAL Photon Gun Updates. This issue has been closed.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/149">Issue
#149</a>: BCAL structure in E/p distributions for kaons. This
issue has been closed.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/143">Issue
#143</a>: BCAL reconstructed energy sometimes broken on
startup: multicore only. Richard has been able to reproduce the
problem of significantly different BCAL energy distributions on
repeated runs of HDGeant4 with a 2 GeV photon particle gun at 60
degrees. This appears to only happen when hdgeant4 is run in
multi-threaded mode. We generally build hdgeant4 against a
multi-threaded build of Geant4, but even so, single-threaded
mode for hdgeant4 seems not to be a problem. Richard noted that
our running on the OSG is always single-threaded. Now that he
can reproduced the problem, he will turn to its solution.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/111">Issue
#111</a>: Difference in Acceptance between G3 and G4. Richard
has produced a branch, bcal_nolight_heavy_rtj, where anything
heavier than a proton will not produce visible energy. Colin
will repeat the studies he presented last time with this branch
and compare.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/93">Issue
#93</a>: Calorimeter timing mismatch between g3 and g4. This
issue still needs to be closed and linked to Issue #111.</li>
</ul>
<h3><span class="mw-headline" id="Richard.27s_Action_Item_Review">Richard's
Action Item Review</span></h3>
<ol>
<li> Richard encouraged us to get started on preparations to
advance to latest Geant4 release G4.10.06. Mark will build a
version set, based on this release, and let Sean et al. know so
they can do some comparative studies before we unleash the new
release on the collaboration.</li>
<li> Richard has discovered 20% reduction in cpu time from killing
particles that go beyond the walls, floor, and ceiling of the
Hall in the simulation.</li>
<li> Investigation of the multi-threaded bcal photon gun anomaly,
discussed above.</li>
<li> Investigation of the backward kaon efficiency step at 120
degrees. There has been some progress on <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/halld_recon/issues/378">halld_recon
Issue #378</a>. See the issue for details.</li>
<li> New HDGeant4 branch "bcal_nolight_heavy_rtj" for suppressing
scintillation by heavy particles in the bcal, discussed above.</li>
<li> "Yet to come": investigation of the 12% drop in preselection
efficiency with CUTS card seen by George in etaprime,p</li>
</ol>
<h3><span class="mw-headline" id="Action_Item_Review">Action Item
Review</span></h3>
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<ol>
<li> Build a version set with Geant4 10.06.04.</li>
<li> Merge issue #93 with #111.</li>
</ol>
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