TestEm5/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028
0029 #include "PrimaryGeneratorAction.hh"
0030
0031 #include "DetectorConstruction.hh"
0032 #include "PrimaryGeneratorMessenger.hh"
0033
0034 #include "G4Event.hh"
0035 #include "G4ParticleDefinition.hh"
0036 #include "G4ParticleTable.hh"
0037 #include "G4SystemOfUnits.hh"
0038 #include "Randomize.hh"
0039
0040 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0041
0042 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
0043 {
0044   G4int n_particle = 1;
0045   fParticleGun = new G4ParticleGun(n_particle);
0046   SetDefaultKinematic();
0047
0048   // create a messenger for this class
0049   fGunMessenger = new PrimaryGeneratorMessenger(this);
0050 }
0051
0052 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0053
0054 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0055 {
0056   delete fParticleGun;
0057   delete fGunMessenger;
0058 }
0059
0060 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0061
0062 void PrimaryGeneratorAction::SetDefaultKinematic()
0063 {
0064   // default particle kinematic
0065   //
0066   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0067   G4ParticleDefinition* particle = particleTable->FindParticle("e-");
0068   fParticleGun->SetParticleDefinition(particle);
0069   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0070   fParticleGun->SetParticleEnergy(30. * MeV);
0071   G4double x0 = -0.4999 * (fDetector->GetWorldSizeX());
0072   fParticleGun->SetParticlePosition(G4ThreeVector(x0, 0.0, 0.0));
0073 }
0074
0075 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0076
0077 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0078 {
0079   // this function is called at the begining of event
0080   //
0081   // randomize the beam, if requested.
0082   if (fRndmBeam > 0.) {
0083     G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
0084     G4double rbeam = 0.5 * (fDetector->GetAbsorberSizeYZ()) * fRndmBeam;
0085     G4double x0 = oldPosition.x();
0086     G4double y0 = (2 * G4UniformRand() - 1.) * rbeam;
0087     G4double z0 = (2 * G4UniformRand() - 1.) * rbeam;
0088     fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0089     fParticleGun->GeneratePrimaryVertex(anEvent);
0090     fParticleGun->SetParticlePosition(oldPosition);
0091   }
0092   else
0093     fParticleGun->GeneratePrimaryVertex(anEvent);
0094 }
0095
0096 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......