dmparticle/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file exoticphysics/dmparticle/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029
0030 #include "PrimaryGeneratorAction.hh"
0031
0032 #include "DetectorConstruction.hh"
0033 #include "TestParameters.hh"
0034
0035 #include "G4Event.hh"
0036 #include "G4ParticleDefinition.hh"
0037 #include "G4ParticleGun.hh"
0038 #include "G4SystemOfUnits.hh"
0039
0040 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0041
0042 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
0043   : G4VUserPrimaryGeneratorAction(), fDetector(det)
0044 {
0045   fParticleGun = new G4ParticleGun(1);
0046   fParticleGun->SetParticleEnergy(100 * GeV);
0047   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0048 }
0049
0050 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0051
0052 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0053 {
0054   delete fParticleGun;
0055 }
0056
0057 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0058
0059 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0060 {
0061   // this function is called at the begining of event
0062   if (0 == anEvent->GetEventID()) {
0063     G4double z0 = -0.5 * (fDetector->GetWorldSizeZ()) + 1 * um;
0064     G4cout << "Event = " << anEvent->GetEventID() << "; z0 = " << z0;
0065     fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, z0));
0066     G4cout << "  Primary direction = " << fParticleGun->GetParticleMomentumDirection() << G4endl;
0067     TestParameters* param = TestParameters::GetPointer();
0068     param->SetBeamParticle(fParticleGun->GetParticleDefinition());
0069     param->SetBeamEnergy(fParticleGun->GetParticleEnergy());
0070     param->SetPositionZ(z0);
0071   }
0072   fParticleGun->GeneratePrimaryVertex(anEvent);
0073 }
0074
0075 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......