set Birk's constant

HEP-FCC · Aug 5, 2021 · c75729e · c75729e
1 parent e9c04f9
commit c75729e
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Showing 4 changed files with 14 additions and 0 deletions.
diff --git a/DRsim/DRsimG4Full/include/SimG4DRcaloActionInitialization.h b/DRsim/DRsimG4Full/include/SimG4DRcaloActionInitialization.h
@@ -14,9 +14,12 @@ class SimG4DRcaloActionInitialization : public G4VUserActionInitialization {
   virtual void Build() const final;
 
   void setSegmentation(dd4hep::DDSegmentation::GridDRcalo* seg) { pSeg = seg; }
+  void setBirksConstant(const std::string scintName, const double birks);
 
 private:
   dd4hep::DDSegmentation::GridDRcalo* pSeg;
+  std::string m_scintName;
+  double m_birks;
 };
 }
 

diff --git a/DRsim/DRsimG4Full/src/components/SimG4DRcaloActions.cpp b/DRsim/DRsimG4Full/src/components/SimG4DRcaloActions.cpp
@@ -29,6 +29,7 @@ StatusCode SimG4DRcaloActions::finalize() { return AlgTool::finalize(); }
 G4VUserActionInitialization* SimG4DRcaloActions::userActionInitialization() {
   auto* actions = new drc::SimG4DRcaloActionInitialization();
   actions->setSegmentation(pSeg);
+  actions->setBirksConstant(m_scintName,m_birks);
 
   return actions;
 }
diff --git a/DRsim/DRsimG4Full/src/components/SimG4DRcaloActions.h b/DRsim/DRsimG4Full/src/components/SimG4DRcaloActions.h
@@ -30,6 +30,8 @@ class SimG4DRcaloActions : public AlgTool, virtual public ISimG4ActionTool {
   dd4hep::DDSegmentation::GridDRcalo* pSeg;
 
   Gaudi::Property<std::string> m_readoutName{this, "readoutName", "DRcaloSiPMreadout", "readout name of DRcalo"};
+  Gaudi::Property<std::string> m_scintName{this, "scintName", "DR_Polystyrene", "Name of the scintillators"};
+  Gaudi::Property<double> m_birks{this, "birks", 0.126, "Birk's constant for the scintillators in mm/MeV"};
 };
 
 #endif
diff --git a/DRsim/DRsimG4Full/src/lib/SimG4DRcaloActionInitialization.cpp b/DRsim/DRsimG4Full/src/lib/SimG4DRcaloActionInitialization.cpp
@@ -1,12 +1,18 @@
 #include "SimG4DRcaloActionInitialization.h"
 #include "SimG4DRcaloSteppingAction.h"
 #include "SimG4DRcaloEventAction.h"
+#include "CLHEP/Units/SystemOfUnits.h"
 
 namespace drc {
 SimG4DRcaloActionInitialization::SimG4DRcaloActionInitialization(): G4VUserActionInitialization() {}
 
 SimG4DRcaloActionInitialization::~SimG4DRcaloActionInitialization() {}
 
+void SimG4DRcaloActionInitialization::setBirksConstant(const std::string scintName, const double birks) {
+  m_scintName = scintName;
+  m_birks = birks;
+}
+
 void SimG4DRcaloActionInitialization::Build() const {
   SimG4DRcaloSteppingAction* steppingAction = new SimG4DRcaloSteppingAction(); // deleted by G4
   steppingAction->setSegmentation(pSeg);
@@ -15,5 +21,7 @@ void SimG4DRcaloActionInitialization::Build() const {
   SimG4DRcaloEventAction* eventAction = new SimG4DRcaloEventAction(); // deleted by G4
   eventAction->setSteppingAction(steppingAction);
   SetUserAction(eventAction);
+
+  G4Material::GetMaterial(m_scintName)->GetIonisation()->SetBirksConstant(m_birks*CLHEP::millimeter/CLHEP::MeV); // makeshift for DD4hep
 }
 }