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<p>Simulators,<br>
</p>
<p>Please find the notes below and at</p>
<p>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_6,_2018">https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_6,_2018</a></p>
<p> -- Mark</p>
<p>_____________________</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting Notes, July 6, 2018</span></h2>
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<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Sean Dobbs</li>
<li> <b> JLab: </b> Thomas Britton, Justin Stevens,
Simon Taylor, Beni Zihlmann</li>
<li> <b> KDH: </b> Mark Ito (chair)</li>
<li> <b> UConn: </b> Richard Jones</li>
</ul>
<h3><span class="mw-headline" id="Goals">Goals</span></h3>
<ul>
<li> Thomas has not had a chance to get to the bggen
sample using HDG4.</li>
<li> Sean: high level comparisons of HDG3 vs. HDG4 with
bggen not useful, too much going on
<ul>
<li> Use pure, simple reactions: e.g. ρ, φ
production</li>
<li> Justin: single particle gun an option too
<ul>
<li> charged particles
<ul>
<li> FDC</li>
<li> CDC</li>
<li> transition region</li>
</ul>
</li>
<li> photons
<ul>
<li> BCAL</li>
<li> FCAL</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li> Sean: want to use latest version of software, old
versions have old software problems</li>
<li> Justin: we should set some milestones
<ul>
<li> by detector? I. e., FDC, CDC, BCAL, FCAL, TOF</li>
<li> Sean: can do comparisons with monitoring
histograms
<ul>
<li> has some ready to go, will publish them</li>
</ul>
</li>
</ul>
</li>
<li> Someone: comparisons might be easier with no
smearing
<ul>
<li> Sean has scripts to look at raw HDDM as
generated by HDG</li>
<li> Smearing can be turned off in mcsmear easily</li>
</ul>
</li>
<li> Need new version set for comparisons
<ul>
<li> look at doing a new release of HDGeant4</li>
<li> wait for Simon pull request before tagging</li>
<li> tag pre-split sim-recon repository, not
post-split halld_sim + halld_recon</li>
</ul>
</li>
</ul>
<h3><span class="mw-headline" id="Issues">Issues</span></h3>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/53">Request
for DGeometry access for DIRC positions in
GlueXPrimaryGeneratorAction</a>
<ul>
<li> Richard will work on this one</li>
</ul>
</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/52">TOF
hit time distribution shape</a>
<ul>
<li> Richard: below thresholds hits are not in HDG4
that might appear in HDG3</li>
</ul>
</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/51">CDC
integrated charge shifted to higher values</a>
<ul>
<li> This one has been resolved</li>
</ul>
</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/10">Time
shift in FCAL showers?</a>
<ul>
<li> Richard: t = 0 not the same as interaction time</li>
<li> there a several suspects for this one</li>
<li> SCAT card sets vertex position</li>
</ul>
</li>
<li> Upgrade path for Geant4
<ul>
<li> going to a new version is difficult</li>
<li> we are happy at current version for now</li>
</ul>
</li>
</ul>
<h3><span class="mw-headline" id="Future_Meetings">Future
Meetings</span></h3>
<ul>
<li> next meeting in two weeks at same time</li>
<li> will meet every two weeks until further notice</li>
</ul>
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