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<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/HDGeant4_Meeting,_April_23,_2019#Minutes">https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_April_23,_2019#Minutes</a></p>
<p> -- Mark</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Minutes of the April 23, 2019 HDGeant4 Meeting</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b>CMU: </b> Naomi Jarvis</li>
<li> <b> JLab: </b> Alex Austregesilo, Thomas Britton,
Mark Dalton, Sean Dobbs, Stuart Fegan, Mark Ito
(chair), Justin Stevens, Simon Taylor, Beni Zihlmann</li>
<li> <b> ODU: </b> Shankar Adhikari</li>
<li> <b> UConn: </b> Richard Jones</li>
</ul>
<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,_April_9,_2019#Minutes"
title="HDGeant4 Meeting, April 9, 2019">the minutes
from the April 9th meeting</a>.
</p>
<ul>
<li> The issues that stand out from Peter's presentation
were the response of the calorimeters to charged
hadrons and the difference in efficiency when events
are simulated with HDGeant vs. HDGeant4.</li>
<li> We still need to answer Carlos Salgado on <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/101">Issue
#101</a>, "Differences between G3 and G4 in eta.pi."</li>
</ul>
<h3><span class="mw-headline"
id="Do-over_on_comparison_studies">Do-over on
comparison studies</span></h3>
<p>Simon showed <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki/images/2/28/G3g4comp.pdf">a
few slides</a>, culled from the hundreds of monitoring
plots he produced, comparing charged-particle-specific
properties of HDGeant vs. HDGeant4. He simulated single
2.0 GeV/c pions generated uniformly in polar angle.
</p>
<p>Even in the sample of histograms he showed, which were
chosen because of differences seen, the differences are
"subtle." Beyond basic understanding of the meaning of
the plots on slide three, we did not come up with a
mission for further exploration for Simon.<span
class="mw-headline" id="Issues_on_GitHub"></span></p>
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<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We reviewed all of <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">the
open issues for HDGeant4</a>.
</p>
<ul>
<li> Reading in # events and source #105 opened 5 days
ago by nsjarvis
<ul>
<li> We endorsed Richard's proposal for avoiding
confusion in specifying the number of events to be
generated and connecting with expectations we have
from our experience with HDGeant.</li>
</ul>
</li>
<li> Run number read in from two places is confusing
#104 opened 5 days ago by nsjarvis
<ul>
<li> Richard explained the hierarchy for specifying
run number. It only remains to move the
explanation to a more easily found document,
perhaps the wiki on GitHub.</li>
</ul>
</li>
<li> Skip (in control.in) is ignored #103 opened 5 days
ago by nsjarvis
<ul>
<li> This needs to be implemented in HDGeant4 to
reproduce the analogous feature of HDGeant.</li>
</ul>
</li>
<li> Terminal cleanup? #102 opened 6 days ago by
mashephe
<ul>
<li> We endorsed Richard's proposal to introduce a
debug level to control verbosity on standard
output.</li>
</ul>
</li>
<li> Differences between G3 and G4 in eta.pi #101 opened
20 days ago by cwsalgado
<ul>
<li> Thomas pointed out that the problem Carlos saw
was due to the lack of the SKIP feature (see Issue
#103 above).</li>
</ul>
</li>
<li> Calorimeter timing mismatch between g3 and g4 #93
opened on Feb 28 by aaust
<ul>
<li> Still needs investigation.</li>
</ul>
</li>
<li> Hit Energy Agreement #89 opened on Feb 26 by
ReBarsotti
<ul>
<li> Sean will talk to Rebecca about closing the
loop on this issue.</li>
</ul>
</li>
</ul>
<h3><span class="mw-headline" id="Pull_Requests_on_GitHub">Pull
Requests on GitHub</span></h3>
<p>We looked at <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/pulls">the
most recent pull requests</a>, but they were kind of
old. Nothing new there.
</p>
<h3><span class="mw-headline"
id="Future_of_the_HDGeant4_Meetings">Future of the
HDGeant4 Meetings</span></h3>
<p>Mark made a proposal, prompted by a conversation he had
had with Sean earlier in the day, that we stop having
regular HDGeant4 meetings and fold the topics discussed
here into Software Meeting agendas. Other ideas were
voiced:
</p>
<ul>
<li> Wait until we have an HDGeant4 Meeting that only
lasts 20 minutes before folding.</li>
<li> Expand the scope of the meeting to include general
simulation topics, a "Simulation Meeting."</li>
</ul>
<p>We agreed to think about this some more.
</p>
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