Geant4 Cross Reference

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Geant4/examples/extended/electromagnetic/TestEm6/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file electromagnetic/TestEm6/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 "G4ParticleGun.hh"
 41 #include "G4ParticleTable.hh"
 42 #include "G4SystemOfUnits.hh"
 43 #include "Randomize.hh"
 44 
 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 46 
 47 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* DC)
 48   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fDetector(DC), fRndmBeam(0), fGunMessenger(0)
 49 {
 50   fParticleGun = new G4ParticleGun(1);
 51   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("gamma");
 52   fParticleGun->SetParticleDefinition(particle);
 53   fParticleGun->SetParticleEnergy(100 * TeV);
 54   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
 55 
 56   // create a messenger for this class
 57   fGunMessenger = new PrimaryGeneratorMessenger(this);
 58 }
 59 
 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 61 
 62 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 63 {
 64   delete fParticleGun;
 65   delete fGunMessenger;
 66 }
 67 
 68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 69 
 70 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 71 {
 72   // this function is called at the begining of event
 73   //
 74   G4double x0 = -0.5 * (fDetector->GetSize());
 75   G4double y0 = 0. * cm, z0 = 0. * cm;
 76 
 77   // randomize the beam, if requested.
 78   //
 79   if (fRndmBeam > 0.) {
 80     G4double rbeam = 0.5 * (fDetector->GetSize()) * fRndmBeam;
 81     y0 = (2 * G4UniformRand() - 1.) * rbeam;
 82     z0 = (2 * G4UniformRand() - 1.) * rbeam;
 83   }
 84   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
 85   fParticleGun->GeneratePrimaryVertex(anEvent);
 86 }
 87 
 88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 89