Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/examples/extended/hadronic/ParticleFluence/Layer/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file PrimaryGeneratorAction.cc
 27 /// \brief Implementation of the PrimaryGeneratorAction class
 28 //
 29 //
 30 
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 33 
 34 #include "PrimaryGeneratorAction.hh"
 35 
 36 #include "DetectorConstruction.hh"
 37 
 38 #include "G4Event.hh"
 39 #include "G4ParticleDefinition.hh"
 40 #include "G4ParticleGun.hh"
 41 #include "G4ParticleTable.hh"
 42 #include "G4SystemOfUnits.hh"
 43 #include "globals.hh"
 44 
 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 46 
 47 PrimaryGeneratorAction::PrimaryGeneratorAction(const DetectorConstruction* pDetector)
 48   : fPointerDetectorConstruction(pDetector)
 49 {
 50   G4int n_particle = 1;
 51   fParticleGun = new G4ParticleGun(n_particle);
 52   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
 53   //***LOOKHERE*** Default particle and energy
 54   fParticleGun->SetParticleDefinition(particleTable->FindParticle("geantino"));
 55   fParticleGun->SetParticleEnergy(10.0 * GeV);
 56   SetGunPosition();
 57 }
 58 
 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 60 
 61 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 62 {
 63   delete fParticleGun;
 64 }
 65 
 66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 67 
 68 void PrimaryGeneratorAction::SetGunPosition() const
 69 {
 70   // Shoot the particle in the middle between the world and the target layer
 71   G4double targetThickness =
 72     (fPointerDetectorConstruction ? fPointerDetectorConstruction->GetThickness() : 0.0);
 73   G4double gunPosition = -0.55 * targetThickness;  //***LOOKHERE*** default gun position
 74                                                    //               along the z-axis
 75   G4cout << G4endl
 76          << "PrimaryGenerationAction::SetGunPosition() : gun position along z = " << gunPosition
 77          << " mm " << G4endl << G4endl;
 78   fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, gunPosition));
 79 }
 80 
 81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 82 
 83 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 84 {
 85   G4ThreeVector v(0.0, 0.0, 1.0);  //***LOOKHERE*** default shoot along the z-axis
 86   fParticleGun->SetParticleMomentumDirection(v);
 87   fParticleGun->GeneratePrimaryVertex(anEvent);
 88 }
 89 
 90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 91