examples/extended/electromagnetic/TestEm0/src/PrimaryGeneratorAction.cc

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/// \file electromagnetic/TestEm0/src/PrimaryGeneratorAction.cc
/// \brief Implementation of the PrimaryGeneratorAction class
//
//
// $Id: PrimaryGeneratorAction.cc 67268 2013-02-13 11:38:40Z ihrivnac $
//
// 

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#include "PrimaryGeneratorAction.hh"

#include "DetectorConstruction.hh"

#include "G4Event.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction( DetectorConstruction* DC)
:G4VUserPrimaryGeneratorAction(),fParticleGun(0),fDetector(DC)                                               
{
  fParticleGun  = new G4ParticleGun(1);
  SetDefaultKinematic();
}

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PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  delete fParticleGun;
}

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void PrimaryGeneratorAction::SetDefaultKinematic()
{
  G4ParticleDefinition* particle
           = G4ParticleTable::GetParticleTable()->FindParticle("e-");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
  fParticleGun->SetParticleEnergy(100*MeV);
  G4double position = -0.5*(fDetector->GetSize());
  fParticleGun->SetParticlePosition(G4ThreeVector(position,0.*cm,0.*cm));
}

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begining of event
  //
  fParticleGun->GeneratePrimaryVertex(anEvent); 
}

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