[Halld-offline] HDGeant4 Meeting Minutes, January 11, 2022

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_January_11,_2022#Minutes> 
and below.

   -- Mark

      __________________________________


    HDGeant4 Meeting, January 11, 2022, Minutes

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

There is a recording of this meeting 
<https://jlab-org.zoomgov.com/rec/share/V97EEHpdU82C0J1rpmZQ44NAqvU-uRUN1FIFTtKt7T6hZDgHInTCiD5yVg414-X-.062c2aUbVDmZKoKh> 
(Passcode: a5$amBYh) on the ZoomGov site.


      Review of minutes from the last meeting

We went over the minutes from the meeting on November 29th 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_November_29,_2021#Minutes>. 


  * We have not had further word on the reports of disagreement between
    data and MC for timing signals timing signals from the FCAL.
  * Data/MC discrepancy in FCal Matching around Beam Hole
    <https://github.com/JeffersonLab/HDGeant4/issues/196>. We went over
    this issue nearly from beginning to end to refresh our collective
    memories. Sean is planning to look at an event sample from Rebecca
    Barsotti with exclusive ω events for hits in the FCAL (a) near the
    beam hole and (b) not from the detected proton or particles from ω
    decay. These may be different than the real data events Alex shows
    in the issue.
  * Crash adding daughters on RHEL/CentOS 8
    <https://github.com/JeffersonLab/HDGeant4/issues/195>. Hao Li closed
    this issue.
  * Add incident angle dependence to DIRC mirror reflectivity
    <https://github.com/JeffersonLab/HDGeant4/issues/191>. No new news
    on this one.


      Issues on GitHub

There were no new issues other than the ones noted above.

Sean mentioned an emerging issue with timing for CPP. Sean asked Elton 
Smith for a sample of signal Monte Carlo (&mu pairs were provided) to 
work out the timing calibration procedure without use of the start 
counter. Some development was needed to get everything working. And yet, 
after calibration constants are applied, the vast majority of events 
show a 4 ns offset from the correct RF time. He is waiting for feedback 
from Elton and Simon, but this may show up as an issue in the future.
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