[Halld-offline] HDGeant4 Meeting Notes, August 14, 2018

[Mark Ito]

Folks,

Find the notes below and by clicking here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_14,_2018#Notes>.

   -- Mark

_______________________________


  Notes, HDGeant4 Meeting, August 14, 2018

Present:

  * *FSU: * Sean Dobbs
  * *JLab: * Thomas Britton, Mark Ito (chair), Justin Stevens, Simon
    Taylor, Beni Zihlmann
  * *UConn: * Richard Jones

There is a recording of this meeting <https://bluejeans.com/s/dHzpO/> on 
the BlueJeans site. Use your JLab credentials.


      Review of notes from last time

  * Notes
    <https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_20,_2018#Notes>
    were reviewed.


      Announcement

*New HDGeant4 tagged release 
<https://mailman.jlab.org/pipermail/halld-offline/2018-August/003324.html>*. 
This one has Richard's FDC fixes.


      Comparison post FDC fix(es)

Thomas showed distribution after fixing. See page 17 of the files posted 
here <https://halldweb.jlab.org/gluex_sim/G3G4_Comparisons/FDCFix/>.

  * First attempt at comparison had problems with wrong tagged version
    of HDGeant4 and a mis-set JANA_CALIB_CONTEXT.
  * Protons at 4 GeV/c at 15 degrees polar angle look much, much better.
  * Still a problem with protons at 4 GeV/c at 4 degrees.
      o FOM distributions on page 23 and 24 are very different.
      o Will repeat turning off mult. scattering, energy loss
        fluctuations, position resolution smearing.
          + [added in press] the control file for this comparison can be
            found at Gcontrol_pure.in
            <https://halldweb.jlab.org/gluex_sim/G3G4_Comparisons/Gcontrol_pure.in>.
      o Time-to-distance relation (TTDR) between Monte Carlo (MC) and MC
        reconstruction not consistent.
      o Simon will look at using same TTDR as used for data in both MC
        and MC reconstruction.


      Issues

We reviewed the issues on GitHub 
<https://github.com/JeffersonLab/HDGeant4/issues>.

  * Geometric overlaps still on the list.
  * Thomas will mark the FDC issue resolved and/or start a new FDC issue
    as appropriate.


      Next Generation of Signal MC

We will wait for further study of FDC issue and adoption of consistent 
TTDR before starting a new round of Signal MC.

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  * This page was last modified on 15 August 2018, at 15:59.

-- 
Mark Ito, marki at jlab.org, (757)269-5295

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