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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_14,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, July 14, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Alex Austregesilo, Sean Dobbs, Colin Gleason,
Mark Ito (chair), Igal Jaegle, Naomi Jarvis, Richard
Jones, Susan Schadmand, Simon Taylor, Nilanga
Wickramaarachchi
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/bJmzz_lD4nJ/">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 the <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_30,_2020#Minutes"
title="HDGeant4 Meeting, June 30, 2020">minutes from
June 30th</a>. Mark I. noted that Issues <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/93">#93</a>
and <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/111">#111</a>
were merged just before the start of the meeting.
</p>
<h3><span class="mw-headline" id="New_release.3F">New
release?</span></h3>
<p>Mark D. explained the need for a new release of
HDGeant4 and version sets, compatible with recon
launches, that include such a release. Alex argued for
updates of halld_recon (for the upcoming recon launch)
and gluex_root_analysis (for PID updates). Richard
requested new halld_recon (for REST changes) and
halld_sim (for updated TOF treatment in mcsmear). Mark
I. agreed to generate the requested version sets.
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We went over the <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">issues</a>.
</p>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/159">Issue
#159 Energy deposition in TOF mismatch in data &
MC</a> can be closed now. Sean will take care of
that.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/111">Issue
#111 Difference in Acceptance between G3 and G4</a>
remains open. Colin will continue to look at this one.</li>
</ul>
<h3><span class="mw-headline" id="Future_Work">Future Work</span></h3>
<ul>
<li> Occasionally, HDGeant4 will complain about particle
propagation not being able to find the normal to a
surface that is about to be crossed, a situation that
should never happen. Richard has tracked it down to
spiraling low energy electrons at the entrance to the
BCAL and the DIRC. He is looking into the cause and a
solution.</li>
<li> Richard is thinking about putting together a
website with weekly runs of the particle gun for a
variety of single particle events, at various angles
and energies, presented via the standard monitoring
histograms, to track performance of HDGeant4 as the
master branch evolves in time. </li>
</ul>
<h3><span class="mw-headline" id="Action_Item_Review">Action
Item Review</span></h3>
<ol>
<li> Try out the bcal_nolight_heavy_rtj branch (to
answer questions raised in Issue #111). (Colin)</li>
<li> Track down the missing normals in the BCAL and
DIRC. (Richard)</li>
</ol>
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