TrackingAction.cc

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// $Id$
// 
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#include "TrackingAction.hh"
#include "PrimaryGeneratorAction.hh"
#include "PrimaryGeneratorAction2.hh"
#include "PrimaryGeneratorAction3.hh"
#include "PrimaryGeneratorAction4.hh"
#include "RunAction.hh"
#include "HistoManager.hh"

#include "G4Track.hh"
#include "G4PhysicalConstants.hh"

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TrackingAction::TrackingAction(PrimaryGeneratorAction* prim,HistoManager* histo)
:fPrimary(prim),fHistoManager(histo)
{ 
 // parameters for generator action #3
  fNewUz = fPrimary->GetAction3()->GetNewUz();

 // parameters for generator action #4
  fDeltaR3 = 
    (fPrimary->GetAction4()->GetRmax3() - fPrimary->GetAction4()->GetRmin3())/3.;
  fCosAlphaMin = fPrimary->GetAction4()->GetCosAlphaMin();
  fCosAlphaMax = fPrimary->GetAction4()->GetCosAlphaMax();
}

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void TrackingAction::PreUserTrackingAction(const G4Track* track)
{
 G4int selectedGeneratorAction = fPrimary->GetSelectedAction();
 G4int id = 0;

 if(selectedGeneratorAction==2)
 {
  //energy spectrum
  //
  id = 1;   
  fHistoManager->FillHisto(id, track->GetKineticEnergy());
 }
 else if(selectedGeneratorAction==3)
 {
  //momentum direction : angular distr dN/dOmega = f(alpha)
  //
  id = 2;
  G4ThreeVector um = track->GetMomentumDirection();
  G4double alpha  = std::acos(fNewUz*um);
  G4double dalfa  = fHistoManager->GetBinWidth(id);
  G4double dOmega = twopi*std::sin(alpha)*dalfa;     
  if (dOmega > 0.) fHistoManager->FillHisto(id, alpha, 1./dOmega);
    
  //momentum direction : angular distr dN/dOmega = f(psi)
  //
  id = 3;
  // complete local frame
  G4ThreeVector u1(1.,0.,0.);  u1.rotateUz(fNewUz);
  G4ThreeVector u2(0.,1.,0.);  u2.rotateUz(fNewUz);  
  //  
  G4double psi = std::atan2(u2*um, u1*um);
  if (psi < 0.) psi += twopi;    
  G4double dpsi  = fHistoManager->GetBinWidth(id);
  G4double alphaMax = fPrimary->GetAction3()->GetAlphaMax();    
  dOmega = (1. - std::cos(alphaMax))*dpsi;     
  if (dOmega > 0.) fHistoManager->FillHisto(id, psi, 1./dOmega);  
 }
 else if(selectedGeneratorAction==4)
 {
  G4ThreeVector vertex   = track->GetVertexPosition();
  G4double r = vertex.mag();
  if (r <= 0.0) return;
  //local frame : new uz = ur
  G4ThreeVector ur   = vertex/r;

  //vertex position: radial distribution : dN/dv = f(r)
  //
  id = 4;
  G4double dr = fHistoManager->GetBinWidth(id);
  G4double dv = 2*twopi*r*r*dr;
  if (dv > 0.) fHistoManager->FillHisto(id, r, 1./dv);

  //vertex position: angular distribution : dN/dv = f(theta)
  //
  id = 5;
  G4double theta  = std::acos(ur.z());
  G4double dteta  = fHistoManager->GetBinWidth(id);
  dv = fDeltaR3*twopi*std::sin(theta)*dteta;
  if (dv > 0.) fHistoManager->FillHisto(id, theta, 1./dv);

  //vertex position: angular distribution : dN/dv = f(phi)
  //
  id = 6;
  G4double phi  = std::atan2(ur.y(), ur.x());
  if (phi < 0.) phi += twopi;
  G4double dphi  = fHistoManager->GetBinWidth(id);
  dv = 2*fDeltaR3*dphi;
  if (dv > 0.) fHistoManager->FillHisto(id, phi, 1./dv);

  //momentum direction : angular distr dN/dOmega = f(alpha)
  //
  id = 7;
  G4ThreeVector um = track->GetMomentumDirection();
  G4double alpha  = std::acos(ur*um);
  G4double dalfa  = fHistoManager->GetBinWidth(id);
  G4double dOmega = twopi*std::sin(alpha)*dalfa;
  if (dOmega > 0.) fHistoManager->FillHisto(id, alpha, 1./dOmega);

  //momentum direction : angular distr dN/dOmega = f(psi)
  //
  id = 8;
  // complete local frame
  G4ThreeVector u1(1.,0.,0.);  u1.rotateUz(ur);
  G4ThreeVector u2(0.,1.,0.);  u2.rotateUz(ur);
  //
  G4double psi = std::atan2(u2*um, u1*um);
  if (psi < 0.) psi += twopi;
  G4double dpsi  = fHistoManager->GetBinWidth(id);
  dOmega = (fCosAlphaMin - fCosAlphaMax)*dpsi;
  if (dOmega > 0.) fHistoManager->FillHisto(id, psi, 1./dOmega);
 }
}

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void TrackingAction::PostUserTrackingAction(const G4Track*)
{ }

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