[Halld-offline] HDGeant4 Meeting Minutes, July 13, 2021

[Mark Ito]

Whoops. Wrong subject on the original message. These are minutes for 
HDGeant4.

On 7/14/21 8:42 PM, Mark Ito wrote:
>
> Folks,
>
> Please find the minutes
>
> and below.
>
>   -- Mark
>
>      ________________________________
>
>
>     HDGeant4 Meeting, July 13, 2021, Minutes
>
> Present: Alex Austregesilo, Tegan Beattie, Sean Dobbs, Mark Ito 
> (chair), Igal Jaegle, Richard Jones, Zisis Papandreou, Beni Zihlmann
>
> There is a recording of this meeting 
> <https://bluejeans.com/s/y9dDGYu6ffY/> on the BlueJeans site. Log into 
> the BlueJeans site <https://jlab.bluejeans.com> first to gain access 
> (use your JLab credentials).
>
>
>       Announcements
>
> Mark announced that a new version set with Geant4 10.06.p01 is coming 
> soon. It depends on running Developers Toolset 8 on CentOS 7.
>
>
>       Review of minutes from the last meeting
>
> We went over the minutes from the meeting on June 29th 
> <https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_29,_2021#Minutes>. 
> Action Item #1, "Re-do comparisons of overall event reconstruction 
> efficiencies," seemed to us a bit off the critical path. Rather 
> consistency check of cross sections measured in data under various 
> conditions, with efficiency corrections from simulation, seem more 
> important now.
>
>
>       Adding Efficiency as a Function of Drift Distance to the FDC
>       Simulation
>
> Richard outlined his plan for adding information from Lubomir 
> Pentchev's Garfield simulation of the FDC. See his plots starting at 
> 16:40 in the recording. Lubomir sees a fall off in efficiency at long 
> drift distances. This effect is not in the simulation. Richard plans 
> to use the relative drop (and not the absolute level) as a function of 
> drift distance from Lubomir's curves. He notes that if one looks at 
> the current discrepancy in efficiency between data and Monte Carlo, 
> generated by Alex, the curve from Lubomir appears to be a good 
> representation of the extra inefficiency seen in data as a function of 
> drift distance.
>
>
>       Issues on GitHub
>
> We went through the issues on GitHub. For links to the issues 
> themselves see the issues page for HDGeant4 
> <https://github.com/JeffersonLab/HDGeant4/issues>.
>
>   * Vertex generation used with BHgen
>       o Richard is working on this one. The first step is to translate
>         an atomic form factor from Ilya Larin from FORTRAN to C++.
>   * Add incident angle dependence to DIRC mirror reflectivity
>       o This is a request for an enhancement[?].
>   * unknown particle type 50 being generated through interactions
>       o Cerenkov photons in the FCAL is not a bug but a feature. This
>         one should be closed.
>   * hits in both CALs from the same track
>       o Sean reminded us that this is due to the mathematical track
>         trajectory properly extrapolated to the FCAL after passing
>         through the BCAL. Real particles will not do this. Should be
>         closed.
>   * unexpected jumps in MC yield vs photon energy
>       o We are waiting on feedback from Hao Li.
>   * Incorrect TAGH counter number assignment
>       o We went to a lot of effort to fix this one. We marked it as
>         closed.
>   * G3/G4 Difference in FDC wire efficiency at the cell boundary
>       o Richard went through the solution to this issue in the meeting
>         proper (see above).
>   * G4 exceptions for certain run numbers
>       o Elton Smith should review this issue and tell us if it is
>         still a problem.
>   * Difference in Acceptance between G3 and G4
>       o We felt that we have come to the end of this issue as written.
>         There may be on-going related mysteries, but those should be
>         re-stated and entered as new issue. We will ask Colin Gleason
>         if this one can be closed.
>
>
>       Action Items
>
>  1. Think about how to study the Schick-Smith-Dalton effect(s). (all)
>  2. Think about a GlueX Doc on simulation. (all)
>  3. Think further about how to get to modern versions of external
>     software packages.
>
>
>
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