DD4hep Developers Meeting

Thursday 27 May 2021, 15:30 → 17:00 Europe/Zurich

2/1-034 (CERN)

Marko Petric (CERN)

Please Join DD4hep developer's meeting via Zoom

A. Sailer, C. Vuosalo, F. Gaede,  M. Frank, T. Madlener, V. Voelkl

1)    Pending problems
1.1) Pending problems reported by Sang Hyun Ko:
     - Cannot setup Birk's constant as material property.
     - No analogy to G4PVParametrized. Unclear if a solution is possible.
1.2) Add GFlash parameterisation to DDG4 (issue #802).
1.4) Simulation instability in CMS
1.5) Subtraction/ExtrudedPolygons: https://github.com/cms-sw/cmssw/issues/33656 (Carl to open an issue in DD4hep)
1.6) Positioning of sensitive volumes: issue #822

2)    Closed issues and fixed problems
2.1) Divided volumes (issue 833). Solved - volume divisions are not real volumes
        though they come in the dress of a TGeoVolume. They are however not supposed to be
        physically placed.
2.2) CMS problem with subtraction - cause not confirmed. Needs further investigation.
2.3) PowerPC segment violations in CMS. Floating point exceptions from arithmetic
       processor in CMS-sw code.

3) Round table
   Markus:     Question of collaboration from University of Tiflis/Georgia about
                     integration of CATIA with DD4hep. Including software supported
                     geometry simplifications to speed up simulation.
   Ianna:       Not connected
   Carl:      NTR   
   Andre:     NTR
   Marko:     Not connected
   Thomas:    NTR
   Valentin:  
        * Want to have self reproducible files, including configuration in the file itself. How to include the complete compact XML as a string?
           * Frank: for iLCSoft/ddsim store the ddsim steering file including compact file
   Frank: Had a meeting with LuxE experiment proposed for the X-FEL. Fixed target experiment, bit of magnetic field + tracker and calorimeter. Pointed them towards DD4hep to describe detector model.

4) AOB

DD4hep vCHEP proceeding status? Inquire via email.

Next meeting in 2 weeks: 10/06/2021