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<p>People,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_23,_2021#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p> ___________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, March 23, 2021, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Alexander Austregesilo, Tegan Beattie, Sean
Dobbs, Mark Ito (chair), Ital Jaegle, Richard Jones,
Zisis Papandreou, Simon Taylor, Nilanga
Wickramaarachchi, Beni Zihlmann
</p>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/3XEXJKsLZrY/">recording
of this meeting</a> on the BlueJeans site. Log into
the BlueJeans site first to gain access (use your JLab
credentials).
</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,_March_9,_2021#Minutes"
title="HDGeant4 Meeting, March 9, 2021">minutes from
the meeting on March 9</a>.
</p>
<h4><span class="mw-headline"
id="Incorrect_TAGH_counter_number_assignment">Incorrect
TAGH counter number assignment</span></h4>
<p><a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/182">Issue
#182</a> is largely resolved now. All relevant pull
requests from Richard have been merged onto the master
branch. Two action items remain:
</p>
<ul>
<li> Make patches to the legacy halld_recon versions
that were used to run reconstruction launches.</li>
<li> Ask Andrew Smith to confirm that the changes
resolve his issue.</li>
</ul>
<h4><span class="mw-headline"
id="New_wiki_page:_Particle_Gun_Collection">New wiki
page: Particle Gun Collection</span></h4>
<p>Richard has added content to the <a
href="https://halldweb.jlab.org/wiki/index.php/Particle_Gun_Collection"
title="Particle Gun Collection">Particle Gun
Collection</a> wiki page since the last meeting. He
gave us a tour. Each "set" of simulations contains
particle-gun simulation of various particles for a
couple of momentum ranges using each of our standard
simulation engines (G3/HADR1, G3/HADR4, G4). The user
can choose to look at the control.in used, the standard
output, and the standard error from the runs. For each
combination the hdgeant(4) HDDM output, the smeared HDDM
file, the resulting REST file, and the root file from
the monitoring histogram plugin are available for
download. In addition there is a built in plot browser
to run root, in the browser, to look at the monitoring
histograms.
</p>
<p>[Added in press: after the meeting, Richard found and
fixed a problem that was causing a problem with the
embedded webpage in Firefox during the meeting.]
</p>
<h4><span class="mw-headline"
id="Hits_in_both_CALs_from_the_same_track">Hits in
both CALs from the same track</span></h4>
<p><a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/185">Issues
#185</a> has been identified as a reconstruction
issue. It should now be closed as an HDGeant4 issue.
Beni did comment that he was not able to reproduce
Lubomir effect (work that he describes in the issue) but
that may be because Beni is using a DSelector and
Lubomir does not.
</p>
<h4><span class="mw-headline"
id="Proton_timing_in_the_BCAL">Proton timing in the
BCAL</span></h4>
<p>On <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/179">Issue
#179</a>, Tegan is waiting on a debug branch from
Richard that will allow easy look up of parent particles
before taking the next step in his studies.
</p>
<h4><span class="mw-headline"
id="G3.2FG4_Difference_in_FDC_wire_efficiency_at_the_cell_boundary">G3/G4
Difference in FDC wire efficiency at the cell boundary</span></h4>
<p><a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/181">Issue
#181</a> has been cleared up, at least insofar as all
simulation engines agree on the DOCA distribution in the
FDC now. There was a bug in calculating DOCA in the FDC
efficiency plugin and a bug in the hit generation for
the FDC in HDGeant4. Both have been found and fixed, and
the agreement verified by Alex. Richard has posted a
pull request for HDGeant4. See the issue itself (linked
above) for a detailed explanation of these problems.
</p>
<p>The next step is to look at the agreement with real
data. Alex intends to do some studies.
</p>
<p>[Added in press: after the meeting Alex merged
Richard's pull request.]
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We looked at two issues, one new, one old:
</p>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/187">Issue
#187: unknown particle type 50 being generated
through interactions</a>. Cerenkov light seems to
have leaked from G3 to G4 via the FCAL.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/167">Issue
#167: G4 exceptions for certain run numbers</a>.
This one needs to get closed.</li>
</ul>
<h3><span class="mw-headline"
id="Charged_particle_energy_in_the_calorimeters">Charged
particle energy in the calorimeters</span></h3>
<p>Sean suggested that we take this up as an issue at the
next meeting, in particular, how to tune the energy
response to match that of data.
</p>
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