HDGeant4 Meeting, June 15, 2021

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HDGeant4 Meeting
Tuesday, June 15, 2021
3:00 pm EDT
BlueJeans: 968 592 007


  1. Announcements
  2. Review of minutes from the last meeting (all)
  3. Issues on GitHub
  4. Pull Requests on GitHub
  5. Action Item Review


Present: Tegan Beattie, Mark Ito (chair), Igal Jaegle, Richard Jones, Zisis Papandreou, Simon Taylor, Beni Zihlmann

There is a recording of this meeting on the BlueJeans site. Log into the BlueJeans site first to gain access (use your JLab credentials).

Review of minutes from the last meeting

We went over the minutes from the meeting on June 1st. Richard has been working on changing the build system for Diracxx to use CMake. He is already using CMake for his stand-alone HDDM package (not to be confused with src/libraries/HDDM in halld_recon, this package corresponds to src/programs/Utilites/hddm in halld_recon). Mark mentioned that he has built stand-alone HDDM in preparation for breaking it out from halld_recon.

Charged hadron timing in the BCAL

Tegan reported that he tried the tighter χ2 cut suggested last time; he did not see a difference from the nominal cut. Sean Dobbs made a suggestion that Tegan start to look at pions in the BCAL. To that end he is getting set up to do a comparison of πΔ++ between simulation and data. He has collected some files from Jon Zarling already.

FDC efficiency modeling

Richard is working on incorporating the efficiency curves produced from Garfield studies by Lubomir Pentchev into the simulation. The per layer hit efficiency is better than that in data at present; this should help.

The Schick Effect and FCAL LEDs

We briefly discussed how we might study the Schick effect, discussed at the last meeting. Using the LEDs to track gains in the FCAL modules appears to be difficult.

Alternate models for electromagnetic shower generation in Geant4

Richard called our attention to the four different options that can be chosen for simulating E&M showers in Geant4. We use option 1, which is good for 100 GeV electrons and photon. Option 4 (code name Livermore) on the other hand is said to be good at 10 GeV, though it might be more calculationally expensive. He plans on introducing an option so the user can choose among these models for future studies.

Action Items

  1. Re-do comparisons of overall event reconstruction efficiencies.
  2. Think about how to study the Schick-Smith-Dalton effect(s). (all)
  3. Think about a GlueX Doc on simulation. (all)
  4. Think about how to get to modern versions of external software packages. (all)