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Geant4/examples/extended/electromagnetic/TestEm17/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file electromagnetic/TestEm17/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 
 37 #include "G4Event.hh"
 38 #include "G4ParticleDefinition.hh"
 39 #include "G4ParticleTable.hh"
 40 #include "G4SystemOfUnits.hh"
 41 #include "Randomize.hh"
 42 
 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 44 
 45 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
 46   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fDetector(det)
 47 {
 48   fParticleGun = new G4ParticleGun(1);
 49   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("mu+");
 50   fParticleGun->SetParticleDefinition(particle);
 51   fParticleGun->SetParticleEnergy(10 * TeV);
 52   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
 53 }
 54 
 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 56 
 57 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 58 {
 59   delete fParticleGun;
 60 }
 61 
 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 63 
 64 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 65 {
 66   // this function is called at the begining of event
 67   //
 68   G4double halfSize = 0.5 * (fDetector->GetSize());
 69   G4double x0 = -halfSize;
 70 
 71   // randomize (y0,z0)
 72   //
 73   G4double beam = 0.8 * halfSize;
 74   G4double y0 = (2 * G4UniformRand() - 1.) * beam;
 75   G4double z0 = (2 * G4UniformRand() - 1.) * beam;
 76 
 77   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
 78   fParticleGun->GeneratePrimaryVertex(anEvent);
 79 }
 80 
 81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 82