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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,_December_18,_2018#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>________________________________________</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, December 18, 2018, </span><span
class="mw-headline" id="Minutes">Minutes</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 Ito (chair), Simon Taylor</li>
<li> <b> UConn: </b> Richard Jones</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/cIQKJ/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_last_time">Review of
minutes from last time</span></h3>
<p>We went over the <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_December_4,_2018#Minutes"
title="HDGeant4 Meeting, December 4, 2018">minutes
from December 4</a>.
</p>
<p>Mark has complete a system for building the GlueX
software on Oasis, usable from a Singularity container,
with all of the pieces needed for code development. Look
for an announcement from him soon.
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We looked at the <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">list
of issues</a>. The only one we needed to discuss was <a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/66">Issue
#66, "More FDC issues?</a>.
</p>
<p>Richard has been looking at FDC hits on forward track,
trying to understand losses. He turns of physics
(multiple scattering, energy loss, etc.) and is
exploring where hits are missed on tracks in this simple
scenario. He is starting with hdgeant3 for these
studies. He finds discrepancies in the drift times
"read-out" in the Monte Carlo vs. the thrown distances
of closest approach to the wires. The cathodes look OK.
</p>
<p>He has come to conclusion that he has to go ahead and
start looking inside the tracking to understand this
problem.
</p>
<p>Mark mentioned there is a possibility of an
inconsistency between the geometry in hdgeant3, coming
from XML files on disk indirectly through FORTRAN code,
and the geometry used by reconstruction, coming from XML
files stored in the CCDB. Richard will think about how
to check consistency automatically.
</p>
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