TestEm3/src/PrimaryGeneratorAction.cc

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0026 /// \file electromagnetic/TestEm3/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 #include "HistoManager.hh"
0037 #include "PrimaryGeneratorMessenger.hh"
0038
0039 #include "G4Event.hh"
0040 #include "G4ParticleDefinition.hh"
0041 #include "G4ParticleGun.hh"
0042 #include "G4ParticleTable.hh"
0043 #include "G4SystemOfUnits.hh"
0044 #include "Randomize.hh"
0045
0046 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0047
0048 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
0049 {
0050   G4int n_particle = 1;
0051   fParticleGun = new G4ParticleGun(n_particle);
0052   SetDefaultKinematic();
0053
0054   // create a messenger for this class
0055   fGunMessenger = new PrimaryGeneratorMessenger(this);
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0061 {
0062   delete fParticleGun;
0063   delete fGunMessenger;
0064 }
0065
0066 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0067
0068 void PrimaryGeneratorAction::SetDefaultKinematic()
0069 {
0070   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0071   G4String particleName;
0072   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
0073   fParticleGun->SetParticleDefinition(particle);
0074   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0075   fParticleGun->SetParticleEnergy(1. * GeV);
0076   G4double position = -0.5 * (fDetector->GetWorldSizeX());
0077   fParticleGun->SetParticlePosition(G4ThreeVector(position, 0. * cm, 0. * cm));
0078 }
0079
0080 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0081
0082 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0083 {
0084   // this function is called at the begining of event
0085   //
0086   // randomize the beam, if requested.
0087   if (fRndmBeam > 0.) {
0088     G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
0089     G4double rbeam = 0.5 * (fDetector->GetCalorSizeYZ()) * fRndmBeam;
0090     G4double x0 = oldPosition.x();
0091     G4double y0 = oldPosition.y() + (2 * G4UniformRand() - 1.) * rbeam;
0092     G4double z0 = oldPosition.z() + (2 * G4UniformRand() - 1.) * rbeam;
0093     fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0094     fParticleGun->GeneratePrimaryVertex(anEvent);
0095     fParticleGun->SetParticlePosition(oldPosition);
0096   }
0097   else
0098     fParticleGun->GeneratePrimaryVertex(anEvent);
0099 }
0100
0101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......