[Halld-offline] HDGeant4 Meeting Minutes, September 11, 2018
marki at jlab.org
Wed Sep 12 12:18:51 EDT 2018
Please find the minutes here
Minutes, HDGeant4 Meeting, September 11, 2018
* *FSU: * Sean Dobbs
* *JLab: * Thomas Britton, Mark Ito (chair), Simon Taylor
* *W&M: * Justin Stevens
There is a recording of this meeting <https://bluejeans.com/s/iMoJk/> on
the BlueJeans site. Use your JLab credentials.
Review of minutes from last time
We reviewed the minutes from August 28
* The change to make the time-to-distance relation used in HDG3 match
that of data (read it from the CCDB) is in the latest tagged version
of halld_sim (3.4.0).
* Sean reported that the 5 MeV shift in the 2γ mass he reported last
time is not limited to just the BCAL or just the FCAL. Both contribute.
Issues on GitHub
We reviewed the extant issues on the GitHub site for HDGeant4
<https://github.com/JeffersonLab/HDGeant4/issues>. Richard Jones
reported (via email) that he is working on the DIRC time propagation
anomaly <https://github.com/JeffersonLab/HDGeant4/issues/65> now.
New Comparison: 4 GeV, 4 Degree Protons
Thomas presented plots from a new comparison of 4 GeV, 4 degree protons
between HDG3 and HDG4. The comparison was done with all physics
processes (multiple scattering, energy loss, delta rays, etc.) turned off.
* The good agreement after fixes from Richard for 4 GeV protons at 15
degrees, seen after the last round of fixes, stays good in this
* The disagreement at 4 degrees persists. It is seen in the following
o Tracking FOM, wire-based
o Tracking FOM
* Thomas will work on getting more detailed plots looking at timing
* Events have not been scanned, as was done in the previous round of
* HDG3 and HDG4 get their geometry in different ways, with the HDG3
geometry written into auto-generated Fortran code and HDG4 getting
it dynamically at run time. We need to check that both are using the
same geometry for this comparison. That could explain the difference
between 4 and 15 degrees (or not).
* Thomas will create a new GitHub issue based on this study. [Added in
press: see Issue #66
* This page was last modified on 12 September 2018, at 12:16.
Mark Ito, marki at jlab.org, (757)269-5295
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