SteppingAction.cc

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// $Id: SteppingAction.cc 73008 2013-08-15 08:43:13Z gcosmo $
//
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#include "SteppingAction.hh"

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

#include "G4Step.hh"

#include "G4Geantino.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();
   
   calorThickness  = detector->GetCalorThickness();
   calorSizeYZ     = detector->GetCalorSizeYZ();
   moduleThickness = detector->GetModuleThickness();   
   d1Pixel = detector->GetD1Pixel();
   d2Pixel = detector->GetD2Pixel();
   n1pxl   = detector->GetN1Pixels();
   n2pxl   = detector->GetN2Pixels();      
   n1shift = detector->GetN1Shift();   
      
   first = false;   
 }

 //locate point in geometry
 //  
 G4TouchableHandle touch1 = step->GetPreStepPoint()->GetTouchableHandle(); 
 G4LogicalVolume* lvol = touch1->GetVolume()->GetLogicalVolume();
 
 //if world, return
 //
 if (lvol == lvol_world) return;
 
 //sum nb of radiation length of calorimeter with geantino
 //
 G4ParticleDefinition* particle = step->GetTrack()->GetDefinition();
 if (particle == G4Geantino::Geantino()) {
   G4double radl  = lvol->GetMaterial()->GetRadlen();
   G4double stepl = step->GetStepLength();
   eventAct->SumNbRadLength(stepl/radl);
 }
    
 //if no edep, return
 //
 G4double edep = step->GetTotalEnergyDeposit();
 if (edep == 0.) return;
 
 //locate position and compute pixel number
 //
 G4ThreeVector point1 = step->GetPreStepPoint()->GetPosition();
 G4int i1Module = (int) ((point1.x() + 0.5*calorThickness)/moduleThickness); 
 G4int i1Pixel  = (int) ((point1.x() + 0.5*calorThickness)/d1Pixel);
 if (i1Pixel < 0 ) i1Pixel = 0;
 if (i1Pixel >= n1pxl) i1Pixel = n1pxl - 1;
 G4double point1yz = point1.y();
 if (i1Module%2 != 0) point1yz = point1.z();
 G4int i2Pixel = (int) ((point1yz + 0.5*calorSizeYZ)/d2Pixel);
 if (i2Pixel < 0 ) i2Pixel = 0;
 if (i2Pixel >= n2pxl) i2Pixel = n2pxl - 1;
  
 G4int  iPixel = i1Pixel*n1shift + i2Pixel;
  
 // sum total energy deposit
 //
 eventAct->SumTotalEnergy(iPixel, edep);         

 //in fiber ?
 //  
 if (lvol == lvol_fiber) {
   eventAct->SumVisibleEnergy(iPixel, 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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