RE04PrimaryGeneratorAction.cc

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// $Id: $
//
#include "RE04PrimaryGeneratorAction.hh"

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
RE04PrimaryGeneratorAction::RE04PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction(),
   fParticleGun(0) 
{
  G4int n_particle = 1;
  fParticleGun  = new G4ParticleGun(n_particle);
  
  // default particle kinematic
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle
                    = particleTable->FindParticle(particleName="mu-");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
  fParticleGun->SetParticlePosition(G4ThreeVector(-75.*cm,0.,0.));
  fParticleGun->SetParticleEnergy(10.*GeV);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
RE04PrimaryGeneratorAction::~RE04PrimaryGeneratorAction()
{
  delete fParticleGun;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void RE04PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4double y = 96.0*cm*(G4UniformRand()-0.5);
  fParticleGun->SetParticlePosition(G4ThreeVector(-75.*cm,y,0.));
  fParticleGun->GeneratePrimaryVertex(anEvent);
}