Geant4: Disable TransportationWithMsc mode

sawenzel · sawenzel · commit f8804784a6ab · 2024-08-13T14:10:46.000+02:00
The combined transportation + multiple scattering stepping mode was introduced in Geant4 11.1 and made the default for physics list FTFP_BERT_EMV. For ALICE, this mode does not work as spotted here: https://its.cern.ch/jira/browse/O2-5212 Disabling this mode fixed the issue and restores the behaviour from Geant4 11.0.4
diff --git a/Detectors/gconfig/g4config.in b/Detectors/gconfig/g4config.in
@@ -43,6 +43,9 @@
 /mcPhysics/emModel/setRegions  EMC_Lead$ EMC_Scintillator$
 /mcPhysics/emModel/setParticles  e- e+
 
+# combined transportation + Msc mode is currently broken for ALICE (Geant 10.2.0)
+/process/em/transportationWithMsc Disabled
+
 #
 # Adding extra lines for fixing tracking bias
 #

Original file line number	Diff line number	Diff line change
`@@ -43,6 +43,9 @@`
`43`	`43`	`/mcPhysics/emModel/setRegions EMC_Lead$ EMC_Scintillator$`
`44`	`44`	`/mcPhysics/emModel/setParticles e- e+`
`45`	`45`
	`46`	`+# combined transportation + Msc mode is currently broken for ALICE (Geant 10.2.0)`
	`47`	`+/process/em/transportationWithMsc Disabled`
	`48`	`+`
`46`	`49`	`#`
`47`	`50`	`# Adding extra lines for fixing tracking bias`
`48`	`51`	`#`