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// $Id: PrimaryGeneratorAction.cc,v 1.3 2006/06/29 17:03:46 gunter Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
//
/////////////////////////////////////////////////////////////////////////
//
// TestEm9: Crystal calorimeter
//
// Created: 31.01.03 V.Ivanchenko
//
// Modified:
//
////////////////////////////////////////////////////////////////////////
//

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#include "PrimaryGeneratorAction.hh"

#include "DetectorConstruction.hh"

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

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PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
:detector(det)
{
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);

  G4ParticleDefinition* particle
                 = G4ParticleTable::GetParticleTable()->FindParticle("e-");
  particleGun->SetParticleDefinition(particle);
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  particleGun->SetParticleEnergy(1.*GeV);
}

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

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4double zVertex = - (detector->GetWorldSizeZ());
  particleGun->SetParticlePosition(G4ThreeVector(0.,0.,zVertex));
  if(anEvent->GetEventID() == 1)
    (HistoManager::GetPointer())->SetBeamEnergy(particleGun->GetParticleEnergy());
  particleGun->GeneratePrimaryVertex(anEvent);
}

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