SteppingAction.cc

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// $Id: SteppingAction.cc 83010 2014-07-24 14:53:07Z gcosmo $
//
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#include "SteppingAction.hh"

#include "DetectorConstruction.hh"
#include "EventAction.hh"

#include "G4Step.hh"

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SteppingAction::SteppingAction(DetectorConstruction* det, EventAction* evt)
:G4UserSteppingAction(),detector(det),eventAct(evt)
{
  first = true;
  lvol_world = lvol_module = lvol_layer = lvol_fiber = 0;
} 

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SteppingAction::~SteppingAction()
{}

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void SteppingAction::UserSteppingAction(const G4Step* step )
{ 
 //some initialisation
 // 
 if (first) {
   lvol_world  = detector->GetLvolWorld();
   lvol_module = detector->GetLvolModule();   
   lvol_layer  = detector->GetLvolLayer();
   lvol_fiber  = detector->GetLvolFiber();      
   first = false;   
 }
 
 //if no edep, return
 //
 G4double edep = step->GetTotalEnergyDeposit();
 
 //locate point in geometry
 //
 G4int iModule = 0;
 G4int iLayer  = 0;
 G4int iFiber  = 0;
   
 G4TouchableHandle touch1 = step->GetPreStepPoint()->GetTouchableHandle(); 
 G4LogicalVolume* lvol = touch1->GetVolume()->GetLogicalVolume();
  
      if (lvol == lvol_world) return;
 else if (lvol == lvol_module) { iModule = touch1->GetCopyNumber(0);}
 else if (lvol == lvol_layer)  { iLayer  = touch1->GetCopyNumber(0);
                                 iModule = touch1->GetCopyNumber(1);}
 else if (lvol == lvol_fiber)  { iFiber  = touch1->GetCopyNumber(0);
                                 iLayer  = touch1->GetCopyNumber(1);
                                 iModule = touch1->GetCopyNumber(2);}

 // sum edep
 //
 eventAct->SumDeStep(iModule, iLayer, iFiber, edep);         
}

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G4double SteppingAction::BirksAttenuation(const G4Step* aStep)
{
 //Example of Birk attenuation law in organic scintillators.
 //adapted from Geant3 PHYS337. See MIN 80 (1970) 239-244
 //
 G4Material* material = aStep->GetTrack()->GetMaterial();
 G4double birk1       = material->GetIonisation()->GetBirksConstant();
 G4double destep      = aStep->GetTotalEnergyDeposit();
 G4double stepl       = aStep->GetStepLength();  
 G4double charge      = aStep->GetTrack()->GetDefinition()->GetPDGCharge();
 //
 G4double response = destep;
 if (birk1*destep*stepl*charge != 0.)
   {
     response = destep/(1. + birk1*destep/stepl);
   }
 return response;
}

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