[Halld-offline] HDGeant4 Meeting Minutes, November 29, 2021

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_November_29,_2021#Minutes> 
and below,

   -- Mark

      _________________________________


    HDGeant4 Meeting, November 29, 2021, Minutes

Present: Alex Austregesilo, Sean Dobbs, Mark Ito (chair), Igal Jaegle, 
Richard Jones, Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/pgAzBpDI2iH> on the BlueJeans site. Log into 
the BlueJeans site <https://jlab.bluejeans.com> first to gain access 
(use your JLab credentials).


      Announcement

There will be a meeting at 4 pm tomorrow 
<https://mailman.jlab.org/pipermail/halld-offline/2021-November/008696.html> 
to discuss preparations for the upcoming Computing Review.


      Review of minutes from the last meeting

We went over the minutes from the meeting on November 15 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_November_15,_2021#Minutes>. 
Richard repeated his report of a possible issue where timing signals 
from the FCAL do not agree between data and MC. There was a report of 
seeing accidental peaks in the raw timing histograms in simulation where 
in data they do not appear. Richard explained that In data, one needs to 
subtract the RF to get peaks; in simulation, if one does the same thing, 
the seen-in-raw-hits peaks persist. By doing time difference to 
time-difference comparisons, there is no mystery, and these are the only 
comparisons we should be doing anyway. He is waiting for confirmation of 
this understanding from the folks who raised the issue.


      Issues on GitHub

We looked at the Issues <https://github.com/JeffersonLab/HDGeant4/issues>.

  * Data/MC discrepancy in FCal Matching around Beam Hole
    <https://github.com/JeffersonLab/HDGeant4/issues/196>
      o Other than that difference in track matching to the FCAL in data
        vs. simulation, initially noted by Alex, Igal raises a lack of
        calibration of 2017 data for the inner blocks.
      o It is not clear that a fiducial cut is needed to exclude inner
        blocks from their role as a backup t-zero setter for tracking.
        The energy is not used, only the time and position in this context.
      o Sean will review the status of the 2017 calibration.
  * Crash adding daughters on RHEL/CentOS 8
    <https://github.com/JeffersonLab/HDGeant4/issues/195>
      o We think this one is resolved but are still waiting for Hao Li
        to confirm the fix.
  * Add incident angle dependence to DIRC mirror reflectivity
    <https://github.com/JeffersonLab/HDGeant4/issues/191>
      o This enhancement remains on the books. Richard will consult with
        the DIRC folks to see if they have done any further thinking on
        this. In principle, implementation is straightforward.

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