Geant4 Cross Reference

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Geant4/examples/extended/electromagnetic/TestEm4/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file electromagnetic/TestEm4/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 "G4Event.hh"
 36 #include "G4ParticleDefinition.hh"
 37 #include "G4ParticleGun.hh"
 38 #include "G4ParticleTable.hh"
 39 #include "G4PhysicalConstants.hh"
 40 #include "G4SystemOfUnits.hh"
 41 #include "Randomize.hh"
 42 
 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 44 
 45 PrimaryGeneratorAction::PrimaryGeneratorAction()
 46 {
 47   G4int n_particle = 1;
 48   fParticleGun = new G4ParticleGun(n_particle);
 49 
 50   // default particle kinematic
 51 
 52   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("gamma");
 53   fParticleGun->SetParticleDefinition(particle);
 54   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
 55   fParticleGun->SetParticleEnergy(9 * MeV);
 56   fParticleGun->SetParticlePosition(G4ThreeVector(0. * cm, 0. * cm, 0. * cm));
 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::GeneratePrimaries(G4Event* anEvent)
 69 {
 70   // this function is called at the begining of event
 71   //
 72   // distribution uniform in solid angle
 73   //
 74   G4double cosTheta = 2 * G4UniformRand() - 1., phi = twopi * G4UniformRand();
 75   G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
 76   G4double ux = sinTheta * std::cos(phi), uy = sinTheta * std::sin(phi), uz = cosTheta;
 77 
 78   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, uz));
 79 
 80   fParticleGun->GeneratePrimaryVertex(anEvent);
 81 }
 82 
 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 84