Hadr05/src/SteppingAction.cc

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0025 //
0026 /// \file SteppingAction.cc
0027 /// \brief Implementation of the SteppingAction class
0028 //
0029 //
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0032
0033 #include "SteppingAction.hh"
0034
0035 #include "DetectorConstruction.hh"
0036 #include "EventAction.hh"
0037 #include "HistoManager.hh"
0038 #include "Run.hh"
0039
0040 #include "G4RunManager.hh"
0041
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0043
0044 SteppingAction::SteppingAction(DetectorConstruction* det, EventAction* evt)
0045   : fDetector(det), fEventAct(evt)
0046 {}
0047
0048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0049
0050 void SteppingAction::UserSteppingAction(const G4Step* aStep)
0051 {
0052   // count processes
0053   //
0054   const G4StepPoint* prePoint = aStep->GetPreStepPoint();
0055   const G4StepPoint* endPoint = aStep->GetPostStepPoint();
0056   const G4VProcess* process = endPoint->GetProcessDefinedStep();
0057   Run* run = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());
0058   run->CountProcesses(process);
0059
0060   // if World, return
0061   //
0062   G4VPhysicalVolume* volume = prePoint->GetTouchableHandle()->GetVolume();
0063   // if sum of absorbers do not fill exactly a layer: check material, not volume.
0064   const G4Material* mat = volume->GetLogicalVolume()->GetMaterial();
0065   if (mat == fDetector->GetWorldMaterial()) return;
0066
0067   const G4ParticleDefinition* particle = aStep->GetTrack()->GetDefinition();
0068
0069   // here we are in an absorber. Locate it
0070   //
0071   G4int absorNum = prePoint->GetTouchableHandle()->GetCopyNumber(0);
0072   G4int layerNum = prePoint->GetTouchableHandle()->GetCopyNumber(1);
0073
0074   // collect energy deposit (taking into account track weight)
0075   G4double edep = aStep->GetTotalEnergyDeposit();
0076   ////edep *= (aStep->GetTrack()->GetWeight());
0077
0078   // collect step length of charged particles
0079   G4double stepl = 0.;
0080   if (particle->GetPDGCharge() != 0.) stepl = aStep->GetStepLength();
0081
0082   // sum up per event
0083   fEventAct->SumEnergy(absorNum, edep, stepl);
0084
0085   // longitudinal profile of edep per absorber
0086   if (edep > 0.) {
0087     G4AnalysisManager::Instance()->FillH1(kMaxAbsor + absorNum, G4double(layerNum + 1), edep);
0088   }
0089
0090   // energy flow
0091   //
0092   //  unique identificator of layer+absorber
0093   G4int Idnow = (fDetector->GetNbOfAbsor()) * layerNum + absorNum;
0094   G4int plane;
0095   //
0096   // leaving the absorber ?
0097   if (endPoint->GetStepStatus() == fGeomBoundary) {
0098     G4ThreeVector position = endPoint->GetPosition();
0099     G4ThreeVector direction = endPoint->GetMomentumDirection();
0100     G4double Eflow = endPoint->GetKineticEnergy();
0101     if (direction.x() >= 0.)
0102       run->SumEnergyFlow(plane = Idnow + 1, Eflow);
0103     else
0104       run->SumEnergyFlow(plane = Idnow, -Eflow);
0105   }
0106
0107   ////  example of Birk attenuation
0108   /// G4double destep   = aStep->GetTotalEnergyDeposit();
0109   /// G4double response = BirksAttenuation(aStep);
0110   /// G4cout << " Destep: " << destep/keV << " keV"
0111   ///       << " response after Birks: " << response/keV << " keV" << G4endl;
0112 }
0113
0114 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0115
0116 G4double SteppingAction::BirksAttenuation(const G4Step* aStep)
0117 {
0118   // Example of Birk attenuation law in organic scintillators.
0119   // adapted from Geant3 PHYS337. See MIN 80 (1970) 239-244
0120   //
0121   const G4Material* material = aStep->GetTrack()->GetMaterial();
0122   G4double birk1 = material->GetIonisation()->GetBirksConstant();
0123   G4double destep = aStep->GetTotalEnergyDeposit();
0124   G4double stepl = aStep->GetStepLength();
0125   G4double charge = aStep->GetTrack()->GetDefinition()->GetPDGCharge();
0126   //
0127   G4double response = destep;
0128   if (birk1 * destep * stepl * charge != 0.) {
0129     response = destep / (1. + birk1 * destep / stepl);
0130   }
0131   return response;
0132 }
0133
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