TestEm3/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 "HistoManager.hh"
0033 #include "PrimaryGeneratorMessenger.hh"
0034
0035 #include "G4Event.hh"
0036 #include "G4ParticleDefinition.hh"
0037 #include "G4ParticleGun.hh"
0038 #include "G4ParticleTable.hh"
0039 #include "G4SystemOfUnits.hh"
0040 #include "Randomize.hh"
0041
0042 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0043
0044 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
0045 {
0046   G4int n_particle = 1;
0047   fParticleGun = new G4ParticleGun(n_particle);
0048   SetDefaultKinematic();
0049
0050   // create a messenger for this class
0051   fGunMessenger = new PrimaryGeneratorMessenger(this);
0052 }
0053
0054 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0055
0056 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0057 {
0058   delete fParticleGun;
0059   delete fGunMessenger;
0060 }
0061
0062 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0063
0064 void PrimaryGeneratorAction::SetDefaultKinematic()
0065 {
0066   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0067   G4String particleName;
0068   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
0069   fParticleGun->SetParticleDefinition(particle);
0070   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0071   fParticleGun->SetParticleEnergy(1. * GeV);
0072   G4double position = -0.5 * (fDetector->GetWorldSizeX());
0073   fParticleGun->SetParticlePosition(G4ThreeVector(position, 0. * cm, 0. * cm));
0074 }
0075
0076 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0077
0078 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0079 {
0080   // this function is called at the begining of event
0081   //
0082   // randomize the beam, if requested.
0083   if (fRndmBeam > 0.) {
0084     G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
0085     G4double rbeam = 0.5 * (fDetector->GetCalorSizeYZ()) * fRndmBeam;
0086     G4double x0 = oldPosition.x();
0087     G4double y0 = oldPosition.y() + (2 * G4UniformRand() - 1.) * rbeam;
0088     G4double z0 = oldPosition.z() + (2 * G4UniformRand() - 1.) * rbeam;
0089     fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0090     fParticleGun->GeneratePrimaryVertex(anEvent);
0091     fParticleGun->SetParticlePosition(oldPosition);
0092   }
0093   else
0094     fParticleGun->GeneratePrimaryVertex(anEvent);
0095 }
0096
0097 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......