XPrimaryGeneratorAction.cc

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

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4RandomDirection.hh"

#include "XTPhononFast.hh"
#include "XTPhononSlow.hh"
#include "XLPhonon.hh"

#include "G4SystemOfUnits.hh"

using namespace std;

XPrimaryGeneratorAction::XPrimaryGeneratorAction()
{ 
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);   

  // default particle kinematic
  particleGun->SetParticleDefinition(XLPhonon::PhononDefinition());
  particleGun->SetParticleMomentumDirection(G4RandomDirection());
  particleGun->SetParticlePosition(G4ThreeVector(0.0,0.0,0.0));
  particleGun->SetParticleEnergy(1e-4*eV);  
}

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XPrimaryGeneratorAction::~XPrimaryGeneratorAction()
{
  delete particleGun;
}

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void XPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
 
  particleGun->SetParticleMomentumDirection(G4RandomDirection());

  G4double selector = G4UniformRand();
  if(selector<0.53539) {
         particleGun->SetParticleDefinition(XTPhononSlow::PhononDefinition()); 
       }
       else if(selector<0.90217) {
         particleGun->SetParticleDefinition(XTPhononFast::PhononDefinition());
       }
       else {
         particleGun->SetParticleDefinition(XLPhonon::PhononDefinition());
  }

  //Set phonon energy.
  //Do not set momentum direction here.
  //Any momentum direction set here will be overwritten
  //by XPhononStackingAction::ClassifyNewTrack
  particleGun->SetParticleEnergy(0.0075*eV);
  particleGun->GeneratePrimaryVertex(anEvent);

}

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