Geant4 Cross Reference

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Geant4/examples/extended/hadronic/Hadr06/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file 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 "G4ParticleTable.hh"
 38 #include "G4PhysicalConstants.hh"
 39 #include "G4SystemOfUnits.hh"
 40 #include "Randomize.hh"
 41 
 42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 43 
 44 PrimaryGeneratorAction::PrimaryGeneratorAction()
 45 {
 46   G4int n_particle = 1;
 47   fParticleGun = new G4ParticleGun(n_particle);
 48 
 49   // default particle kinematic
 50 
 51   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("neutron");
 52   fParticleGun->SetParticleDefinition(particle);
 53   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
 54   fParticleGun->SetParticleEnergy(14 * MeV);
 55   fParticleGun->SetParticlePosition(G4ThreeVector(0. * cm, 0. * cm, 0. * cm));
 56 }
 57 
 58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 59 
 60 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 61 {
 62   delete fParticleGun;
 63 }
 64 
 65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 66 
 67 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 68 {
 69   // this function is called at the begining of event
 70   //
 71   // distribution uniform in solid angle
 72   //
 73   G4double cosTheta = 2 * G4UniformRand() - 1., phi = twopi * G4UniformRand();
 74   G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
 75   G4double ux = sinTheta * std::cos(phi), uy = sinTheta * std::sin(phi), uz = cosTheta;
 76 
 77   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, uz));
 78 
 79   fParticleGun->GeneratePrimaryVertex(anEvent);
 80 }
 81 
 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 83