Geant4 Cross Reference

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Geant4/examples/extended/electromagnetic/TestEm12/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file electromagnetic/TestEm12/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 "PrimaryGeneratorMessenger.hh"
 36 
 37 #include "G4Event.hh"
 38 #include "G4ParticleDefinition.hh"
 39 #include "G4ParticleGun.hh"
 40 #include "G4ParticleTable.hh"
 41 #include "G4PhysicalConstants.hh"
 42 #include "G4SystemOfUnits.hh"
 43 #include "Randomize.hh"
 44 
 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 46 
 47 PrimaryGeneratorAction::PrimaryGeneratorAction()
 48 {
 49   fParticleGun = new G4ParticleGun(1);
 50   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
 51   fParticleGun->SetParticleDefinition(particle);
 52   fParticleGun->SetParticleEnergy(4 * MeV);
 53   fParticleGun->SetParticlePosition(G4ThreeVector());
 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   // randomize the beam, if requested.
 73   //
 74   if (fRndmBeam) {
 75     // distribution uniform in solid angle
 76     //
 77     G4double cosTheta = 2 * G4UniformRand() - 1., phi = twopi * G4UniformRand();
 78     G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
 79     G4double ux = sinTheta * std::cos(phi), uy = sinTheta * std::sin(phi), uz = cosTheta;
 80     fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux, uy, uz));
 81   }
 82 
 83   fParticleGun->GeneratePrimaryVertex(anEvent);
 84 }
 85 
 86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 87