MCTruth/src/PrimaryGeneratorAction.cc

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0026 /// \file eventgenerator/HepMC/MCTruth/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029 //
0030 //
0031 //
0032 // --------------------------------------------------------------
0033 //      GEANT 4 - PrimaryGeneratorAction class
0034 // --------------------------------------------------------------
0035 //
0036 // Author: Witold POKORSKI (Witold.Pokorski@cern.ch)
0037 //
0038 // --------------------------------------------------------------
0039 //
0040 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0041
0042 #include "PrimaryGeneratorAction.hh"
0043
0044 #include "G4Event.hh"
0045 #include "G4ParticleDefinition.hh"
0046 #include "G4ParticleGun.hh"
0047 #include "G4ParticleTable.hh"
0048 #include "G4SystemOfUnits.hh"
0049 #include "globals.hh"
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0052
0053 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
0054 {
0055   G4int n_particle = 1;
0056   fParticleGun = new G4ParticleGun(n_particle);
0057
0058   // default particle
0059
0060   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0061   G4ParticleDefinition* particle = particleTable->FindParticle("kaon0S");
0062
0063   fParticleGun->SetParticleDefinition(particle);
0064   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0065   fParticleGun->SetParticleEnergy(3.0 * GeV);
0066 }
0067
0068 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0069
0070 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0071 {
0072   delete fParticleGun;
0073 }
0074
0075 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0076
0077 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0078 {
0079   G4double position = 0.0;
0080   fParticleGun->SetParticlePosition(G4ThreeVector(0. * cm, 0. * cm, position));
0081
0082   fParticleGun->GeneratePrimaryVertex(anEvent);
0083 }
0084
0085 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....