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Geant4/examples/extended/eventgenerator/HepMC/MCTruth/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file eventgenerator/HepMC/MCTruth/src/PrimaryGeneratorAction.cc
 27 /// \brief Implementation of the PrimaryGeneratorAction class
 28 //
 29 //
 30 //
 31 //
 32 // --------------------------------------------------------------
 33 //      GEANT 4 - PrimaryGeneratorAction class
 34 // --------------------------------------------------------------
 35 //
 36 // Author: Witold POKORSKI (Witold.Pokorski@cern.ch)
 37 //
 38 // --------------------------------------------------------------
 39 //
 40 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 41 
 42 #include "PrimaryGeneratorAction.hh"
 43 
 44 #include "G4Event.hh"
 45 #include "G4ParticleDefinition.hh"
 46 #include "G4ParticleGun.hh"
 47 #include "G4ParticleTable.hh"
 48 #include "G4SystemOfUnits.hh"
 49 #include "globals.hh"
 50 
 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 52 
 53 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
 54 {
 55   G4int n_particle = 1;
 56   fParticleGun = new G4ParticleGun(n_particle);
 57 
 58   // default particle
 59 
 60   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
 61   G4ParticleDefinition* particle = particleTable->FindParticle("kaon0S");
 62 
 63   fParticleGun->SetParticleDefinition(particle);
 64   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
 65   fParticleGun->SetParticleEnergy(3.0 * GeV);
 66 }
 67 
 68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 69 
 70 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 71 {
 72   delete fParticleGun;
 73 }
 74 
 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 76 
 77 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 78 {
 79   G4double position = 0.0;
 80   fParticleGun->SetParticlePosition(G4ThreeVector(0. * cm, 0. * cm, position));
 81 
 82   fParticleGun->GeneratePrimaryVertex(anEvent);
 83 }
 84 
 85 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 86