Hadr01/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file hadronic/Hadr01/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029 //
0030 /////////////////////////////////////////////////////////////////////////
0031 //
0032 // PrimaryGeneratorAction
0033 //
0034 // Created: 31.01.03 V.Ivanchenko
0035 //
0036 // Modified:
0037 // 04.06.2006 Adoptation of Hadr01 (V.Ivanchenko)
0038 // 16.11.2006 Add option allowing to have user defined beam position (VI)
0039 //
0040 ////////////////////////////////////////////////////////////////////////
0041 //
0042
0043 #include "PrimaryGeneratorAction.hh"
0044
0045 #include "HistoManager.hh"
0046
0047 #include "G4ParticleGun.hh"
0048 #include "G4SystemOfUnits.hh"
0049
0050 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0051
0052 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
0053 {
0054   fParticleGun = new G4ParticleGun(1);
0055   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0056   fHisto = HistoManager::GetPointer();
0057 }
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0060
0061 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0062 {
0063   delete fParticleGun;
0064 }
0065
0066 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0067
0068 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0069 {
0070   if (fHisto->DefaultBeamPosition()) {
0071     static const G4double offset = 2 * CLHEP::mm;
0072     G4double zVertex = -(offset + 0.5 * fHisto->Length());
0073     fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., zVertex));
0074   }
0075   fParticleGun->GeneratePrimaryVertex(anEvent);
0076 }
0077
0078 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......