monopole/src/PrimaryGeneratorAction.cc

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0026 /// \file exoticphysics/monopole/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 "G4ParticleGun.hh"
0040 #include "G4SystemOfUnits.hh"
0041
0042 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0043
0044 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
0045   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fDetector(det), fPrimPositionDefined(false)
0046 {
0047   fParticleGun = new G4ParticleGun(1);
0048   fParticleGun->SetParticleEnergy(100 * GeV);
0049   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0050 }
0051
0052 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0053
0054 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0055 {
0056   delete fParticleGun;
0057 }
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0060
0061 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0062 {
0063   // this function is called at the begining of event
0064   if (0 == anEvent->GetEventID() || !fPrimPositionDefined) {
0065     G4double x0 = -0.5 * (fDetector->GetWorldSizeX()) + 1 * um;
0066     fParticleGun->SetParticlePosition(G4ThreeVector(x0, 0.0, 0.0));
0067     fPrimPositionDefined = true;
0068   }
0069
0070   fParticleGun->GeneratePrimaryVertex(anEvent);
0071 }
0072
0073 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......