TrackingAction.cc

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

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

#include "G4Track.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

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TrackingAction::TrackingAction(DetectorConstruction* DET,RunAction* RA,
                               HistoManager* HM)
:fDetector(DET), fRunAction(RA), fHistoManager(HM)
{
 fZend = 0.5*(fDetector->GetThicknessWorld()); 
}
 
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void TrackingAction::PreUserTrackingAction(const G4Track*)
{ }

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void TrackingAction::PostUserTrackingAction(const G4Track* track)
{
  G4double charge = track->GetDefinition()->GetPDGCharge();
  G4ThreeVector position = track->GetPosition();
  G4ThreeVector direction = track->GetMomentumDirection();    

  if (charge == 0.0)       return;
  if (position.z() < fZend) return;
  if (direction.z() <= 0.) return;
    
  G4double rmin, dr, ds;
  G4int ih = 1;
    
  //projected angle at exit
  //
  G4double ux = direction.x(), uy = direction.y(), uz = direction.z();
  if (fHistoManager->HistoExist(ih)) {
    G4double thetax = std::atan(ux/uz);
    G4double thetay = std::atan(uy/uz);
    fHistoManager->FillHisto(ih, thetax);
    fHistoManager->FillHisto(ih, thetay);
  }
      
  //dN/dS at exit
  //
  G4double x = position.x(), y = position.y();
  G4double r = std::sqrt(x*x + y*y);
  ih = 2;
  if (fHistoManager->HistoExist(ih)) {
    dr = fHistoManager->GetBinWidth(ih);
    rmin = ((int)(r/dr))*dr;
    ds = twopi*(rmin + 0.5*dr)*dr;        
    fHistoManager->FillHisto(ih, r, 1/ds);  
  }
      
  //d(N/cost)/dS at exit
  //
  ih = 3;
  if (fHistoManager->HistoExist(ih)) {
    dr = fHistoManager->GetBinWidth(ih);
    rmin = ((int)(r/dr))*dr;
    ds = twopi*(rmin + 0.5*dr)*dr;        
    fHistoManager->FillHisto(ih, r, 1/(uz*ds));
  }
  
  //vector of d(N/cost)/dS at exit
  //
  fRunAction->SumFluence(r, 1/uz);
}

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