ExP01PrimaryGeneratorAction.cc

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/// \file persistency/P01/src/ExP01PrimaryGeneratorAction.cc
/// \brief Implementation of the ExP01PrimaryGeneratorAction class
//
//
// $Id: ExP01PrimaryGeneratorAction.cc 71791 2013-06-24 14:08:28Z gcosmo $
//
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#include "ExP01PrimaryGeneratorAction.hh"
#include "ExP01DetectorConstruction.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "globals.hh"
#include "G4SystemOfUnits.hh"

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ExP01PrimaryGeneratorAction::ExP01PrimaryGeneratorAction(
                                               ExP01DetectorConstruction* myDC)
:G4VUserPrimaryGeneratorAction(),
 fParticleGun(0), fMyDetector(myDC)
{
  G4int n_particle = 1;
  fParticleGun = new G4ParticleGun(n_particle);

// default particle

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* particle = particleTable->FindParticle("proton");
  
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fParticleGun->SetParticleEnergy(3.0*GeV);
}

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ExP01PrimaryGeneratorAction::~ExP01PrimaryGeneratorAction()
{
  delete fParticleGun;
}

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void ExP01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{ 
  G4double position = -0.5*(fMyDetector->GetWorldFullLength());
  fParticleGun->SetParticlePosition(G4ThreeVector(0.*cm,0.*cm,position));
  
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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