SteppingAction.cc

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// $Id$
//
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#include "SteppingAction.hh"

#include "DetectorConstruction.hh"
#include "RunAction.hh"
#include "EventAction.hh"
#include "HistoManager.hh"

#include "G4Step.hh"
#include "G4Positron.hh"
#include "G4RunManager.hh"
#include "G4PhysicalConstants.hh"

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SteppingAction::SteppingAction(DetectorConstruction* det, RunAction* run,
                               EventAction* evt)
:G4UserSteppingAction(),fDetector(det),fRunAct(run),fEventAct(evt) 
{ }

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SteppingAction::~SteppingAction()
{}

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void SteppingAction::UserSteppingAction(const G4Step* aStep)
{
  //track informations
  const G4StepPoint* prePoint = aStep->GetPreStepPoint();   
  const G4StepPoint* endPoint = aStep->GetPostStepPoint();
  const G4ParticleDefinition* particle = aStep->GetTrack()->GetDefinition(); 
    
  //if World, return
  //
  G4VPhysicalVolume* volume = prePoint->GetTouchableHandle()->GetVolume();    
  //if sum of absorbers do not fill exactly a layer: check material, not volume.
  G4Material* mat = volume->GetLogicalVolume()->GetMaterial();
  if (mat == fDetector->GetWorldMaterial()) return; 
 
  //here we are in an absorber. Locate it
  //
  G4int absorNum  = prePoint->GetTouchableHandle()->GetCopyNumber(0);
  G4int layerNum  = prePoint->GetTouchableHandle()->GetCopyNumber(1);
         
  // collect energy deposit taking into account track weight
  G4double edep = aStep->GetTotalEnergyDeposit()*aStep->GetTrack()->GetWeight();
  
  // collect step length of charged particles
  G4double stepl = 0.;
  if (particle->GetPDGCharge() != 0.) {
    stepl = aStep->GetStepLength();
    fRunAct->AddChargedStep();
  } else { fRunAct->AddNeutralStep(); }
  
  //  G4cout << "Nabs= " << absorNum << "   edep(keV)= " << edep << G4endl;
  
  // sum up per event
  fEventAct->SumEnergy(absorNum,edep,stepl);
  
  //longitudinal profile of edep per absorber
  if (edep>0.) {
    G4AnalysisManager::Instance()->FillH1(MaxAbsor+absorNum, 
                      G4double(layerNum+1), edep);
  }
  //energy flow
  //
  // unique identificator of layer+absorber
  G4int Idnow = (fDetector->GetNbOfAbsor())*layerNum + absorNum;
  G4int plane;
  //
  //leaving the absorber ?
  if (endPoint->GetStepStatus() == fGeomBoundary) {
    G4ThreeVector position  = endPoint->GetPosition();
    G4ThreeVector direction = endPoint->GetMomentumDirection();
    G4double sizeYZ = 0.5*fDetector->GetCalorSizeYZ();       
    G4double Eflow = endPoint->GetKineticEnergy();
    if (particle == G4Positron::Positron()) Eflow += 2*electron_mass_c2;
    if ((std::abs(position.y()) >= sizeYZ) || (std::abs(position.z()) >= sizeYZ)) 
                                  fRunAct->SumLateralEleak(Idnow, Eflow);
    else if (direction.x() >= 0.) fRunAct->SumEnergyFlow(plane=Idnow+1, Eflow);
    else                          fRunAct->SumEnergyFlow(plane=Idnow,  -Eflow);    
  }   

}

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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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