examples/extended/exoticphysics/dmparticle/src/PrimaryGeneratorAction.cc

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// $Id$

#include "PrimaryGeneratorAction.hh"
#include "DetectorConstruction.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleDefinition.hh"
#include "G4Event.hh"
#include "TestParameters.hh"
#include "G4SystemOfUnits.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
  :G4VUserPrimaryGeneratorAction(),fDetector(det)
{
  fParticleGun  = new G4ParticleGun(1);
  fParticleGun->SetParticleEnergy(100 * GeV);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
}

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

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  // this function is called at the begining of event
  if( 0 == anEvent->GetEventID() ) 
  {
    G4double z0 = -0.5*(fDetector->GetWorldSizeZ()) + 1*um;
    G4cout<<"Event = "<<anEvent->GetEventID()<<"; z0 = "<<z0;
    fParticleGun->SetParticlePosition( G4ThreeVector( 0.0, 0.0, z0) );
    G4cout<<"  Primary direction = "
          <<fParticleGun->GetParticleMomentumDirection()<<G4endl;
    TestParameters* param = TestParameters::GetPointer();
    param->SetBeamParticle(fParticleGun->GetParticleDefinition());
    param->SetBeamEnergy(fParticleGun->GetParticleEnergy());
    param->SetPositionZ(z0);
  }  
  fParticleGun->GeneratePrimaryVertex( anEvent );
}

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