Geant4 Cross Reference

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Geant4/examples/extended/medical/fanoCavity/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file medical/fanoCavity/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 "G4PhysicalConstants.hh"
 43 #include "G4SystemOfUnits.hh"
 44 #include "Randomize.hh"
 45 
 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 47 
 48 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
 49   : fParticleGun(0), fDetector(det), fGunMessenger(0)
 50 {
 51   fParticleGun = new G4ParticleGun(1);
 52   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("gamma");
 53   fParticleGun->SetParticleDefinition(particle);
 54   fParticleGun->SetParticleEnergy(1.25 * MeV);
 55   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
 56 
 57   fRBeam = 1.;
 58 
 59   // create a messenger for this class
 60   fGunMessenger = new PrimaryGeneratorMessenger(this);
 61 }
 62 
 63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 64 
 65 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 66 {
 67   delete fParticleGun;
 68   delete fGunMessenger;
 69 }
 70 
 71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 72 
 73 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 74 {
 75   // this function is called at the begining of event
 76   //
 77   G4double z0 = -0.5 * (fDetector->GetTotalThickness());
 78   G4double x0 = 0. * cm, y0 = 0. * cm;
 79 
 80   // beam width
 81   //
 82   if (fRBeam > 0.) {
 83     G4double beam = fRBeam * (fDetector->GetWallRadius());
 84     G4double r = beam * std::sqrt(G4UniformRand());
 85     G4double theta = twopi * G4UniformRand();
 86     x0 = r * std::cos(theta);
 87     y0 = r * std::sin(theta);
 88   }
 89   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
 90   fParticleGun->GeneratePrimaryVertex(anEvent);
 91 }
 92 
 93 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 94