MCTruth/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028
0029 // --------------------------------------------------------------
0030 //      GEANT 4 - PrimaryGeneratorAction class
0031 // --------------------------------------------------------------
0032 //
0033 // Author: Witold POKORSKI (Witold.Pokorski@cern.ch)
0034 //
0035 // --------------------------------------------------------------
0036 //
0037 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0038
0039 #include "PrimaryGeneratorAction.hh"
0040
0041 #include "G4Event.hh"
0042 #include "G4ParticleDefinition.hh"
0043 #include "G4ParticleGun.hh"
0044 #include "G4ParticleTable.hh"
0045 #include "G4SystemOfUnits.hh"
0046 #include "globals.hh"
0047
0048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0049
0050 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
0051 {
0052   G4int n_particle = 1;
0053   fParticleGun = new G4ParticleGun(n_particle);
0054
0055   // default particle
0056
0057   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0058   G4ParticleDefinition* particle = particleTable->FindParticle("kaon0S");
0059
0060   fParticleGun->SetParticleDefinition(particle);
0061   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0062   fParticleGun->SetParticleEnergy(3.0 * GeV);
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0066
0067 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0068 {
0069   delete fParticleGun;
0070 }
0071
0072 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0073
0074 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0075 {
0076   G4double position = 0.0;
0077   fParticleGun->SetParticlePosition(G4ThreeVector(0. * cm, 0. * cm, position));
0078
0079   fParticleGun->GeneratePrimaryVertex(anEvent);
0080 }
0081
0082 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....