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Geant4/examples/extended/electromagnetic/TestEm5/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file electromagnetic/TestEm5/src/PrimaryGeneratorAction.cc
 27 /// \brief Implementation of the PrimaryGeneratorAction class
 28 //
 29 //
 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 
 33 #include "PrimaryGeneratorAction.hh"
 34 
 35 #include "DetectorConstruction.hh"
 36 #include "PrimaryGeneratorMessenger.hh"
 37 
 38 #include "G4Event.hh"
 39 #include "G4ParticleDefinition.hh"
 40 #include "G4ParticleTable.hh"
 41 #include "G4SystemOfUnits.hh"
 42 #include "Randomize.hh"
 43 
 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 45 
 46 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
 47 {
 48   G4int n_particle = 1;
 49   fParticleGun = new G4ParticleGun(n_particle);
 50   SetDefaultKinematic();
 51 
 52   // create a messenger for this class
 53   fGunMessenger = new PrimaryGeneratorMessenger(this);
 54 }
 55 
 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 57 
 58 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 59 {
 60   delete fParticleGun;
 61   delete fGunMessenger;
 62 }
 63 
 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 65 
 66 void PrimaryGeneratorAction::SetDefaultKinematic()
 67 {
 68   // default particle kinematic
 69   //
 70   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
 71   G4ParticleDefinition* particle = particleTable->FindParticle("e-");
 72   fParticleGun->SetParticleDefinition(particle);
 73   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
 74   fParticleGun->SetParticleEnergy(30. * MeV);
 75   G4double x0 = -0.4999 * (fDetector->GetWorldSizeX());
 76   fParticleGun->SetParticlePosition(G4ThreeVector(x0, 0.0, 0.0));
 77 }
 78 
 79 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 80 
 81 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 82 {
 83   // this function is called at the begining of event
 84   //
 85   // randomize the beam, if requested.
 86   if (fRndmBeam > 0.) {
 87     G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
 88     G4double rbeam = 0.5 * (fDetector->GetAbsorberSizeYZ()) * fRndmBeam;
 89     G4double x0 = oldPosition.x();
 90     G4double y0 = (2 * G4UniformRand() - 1.) * rbeam;
 91     G4double z0 = (2 * G4UniformRand() - 1.) * rbeam;
 92     fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
 93     fParticleGun->GeneratePrimaryVertex(anEvent);
 94     fParticleGun->SetParticlePosition(oldPosition);
 95   }
 96   else
 97     fParticleGun->GeneratePrimaryVertex(anEvent);
 98 }
 99 
100 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
101