TestEm2/src/PrimaryGeneratorAction.cc

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0026 /// \file electromagnetic/TestEm2/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
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
0049   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
0050   fParticleGun->SetParticleDefinition(particle);
0051   fParticleGun->SetParticleEnergy(5. * GeV);
0052   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -1 * cm));
0053   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0054 }
0055
0056 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0057
0058 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0059 {
0060   delete fParticleGun;
0061 }
0062
0063 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0064
0065 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0066 {
0067   // this function is called at the begin of event
0068   //
0069   G4double position = -0.5 * (fDetector->GetfullLength());
0070   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., position));
0071   fParticleGun->GeneratePrimaryVertex(anEvent);
0072 }
0073
0074 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......