Skip to content

GitLab

Open
Created by Wouter Deconinck@wdconincOwner

Set birks constants without patching geant4

Interfaces:

  • geant4: G4Material* m; m->GetIonisation()->SetBirksContant(value);

Problems:

  • G4GDMLReadMaterials does not support <material> properties relevant to ionization beyond MEE
  • dd4hep::Geant4Converter doesn't set any ionization properties beyond MEE (and even this it doesn't actually set them but lets TGeo do the work using GDML)

Possible strategy:

  • dd4hep::Material has support for Property, which is a TGDMLMatrix pointer. We could define the birks constant as a material property table, similar to index of refraction for optical materials. That's a bit of an abuse of the material property tables since birks constants are never tables (or at least energy-dependence is not supported in geant4).