TestEm18/src/PrimaryGeneratorAction.cc

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0026 /// \file electromagnetic/TestEm18/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029 //
0030 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032
0033 #include "PrimaryGeneratorAction.hh"
0034
0035 #include "DetectorConstruction.hh"
0036
0037 #include "G4Event.hh"
0038 #include "G4ParticleDefinition.hh"
0039 #include "G4ParticleTable.hh"
0040 #include "G4SystemOfUnits.hh"
0041 #include "Randomize.hh"
0042
0043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0044
0045 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
0046 {
0047   fParticleGun = new G4ParticleGun(1);
0048   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
0049   fParticleGun->SetParticleDefinition(particle);
0050   fParticleGun->SetParticleEnergy(10 * MeV);
0051   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0052 }
0053
0054 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0055
0056 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0057 {
0058   delete fParticleGun;
0059 }
0060
0061 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0062
0063 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0064 {
0065   // this function is called at the begining of event
0066   //
0067   G4double halfSize = 0.5 * (fDetector->GetSize());
0068   G4double x0 = -halfSize;
0069
0070   // randomize (y0,z0)
0071   //
0072   G4double beam = 0.8 * halfSize;
0073   G4double y0 = (2 * G4UniformRand() - 1.) * beam;
0074   G4double z0 = (2 * G4UniformRand() - 1.) * beam;
0075
0076   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0077   fParticleGun->GeneratePrimaryVertex(anEvent);
0078 }
0079
0080 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......