Par02/src/Par02PrimaryGeneratorAction.cc

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0026 //
0027 /// \file Par02PrimaryGeneratorAction.cc
0028 /// \brief Implementation of the Par02PrimaryGeneratorAction class
0029
0030 #include "Par02PrimaryGeneratorAction.hh"
0031
0032 #include "Par02PrimaryParticleInformation.hh"
0033
0034 #include "G4Event.hh"
0035 #include "G4ParticleDefinition.hh"
0036 #include "G4ParticleGun.hh"
0037 #include "G4ParticleTable.hh"
0038 #include "G4SystemOfUnits.hh"
0039 #include "globals.hh"
0040
0041 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0042
0043 Par02PrimaryGeneratorAction::Par02PrimaryGeneratorAction()
0044 {
0045   G4int n_particle = 1;
0046   fParticleGun = new G4ParticleGun(n_particle);
0047
0048   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0049   G4String particleName;
0050   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "geantino");
0051   fParticleGun->SetParticleDefinition(particle);
0052
0053   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.0, 1.0, 0.0));
0054   fParticleGun->SetParticleEnergy(100.0 * GeV);
0055   fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 Par02PrimaryGeneratorAction::~Par02PrimaryGeneratorAction()
0061 {
0062   delete fParticleGun;
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 void Par02PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0068 {
0069   fParticleGun->GeneratePrimaryVertex(anEvent);
0070
0071   // Loop over the vertices, and then over primary particles,
0072   // and for each primary particle create an info object, in
0073   // which to store "Monte Carlo true" information.
0074   // This approach could appear unnecessarily heavy in the present case
0075   // of a trivial particle gun generator, but it is useful in the more
0076   // realistic case of a Monte Carlo event generator like Pythia8.
0077   G4int count_particles = 0;
0078   for (G4int ivtx = 0; ivtx < anEvent->GetNumberOfPrimaryVertex(); ivtx++) {
0079     for (G4int ipp = 0; ipp < anEvent->GetPrimaryVertex(ivtx)->GetNumberOfParticle(); ipp++) {
0080       G4PrimaryParticle* primary_particle = anEvent->GetPrimaryVertex(ivtx)->GetPrimary(ipp);
0081       if (primary_particle) {
0082         primary_particle->SetUserInformation(new Par02PrimaryParticleInformation(
0083           count_particles, primary_particle->GetPDGcode(), primary_particle->GetMomentum()));
0084         count_particles++;
0085       }
0086     }
0087   }
0088 }
0089
0090 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0091
0092 G4ParticleGun* Par02PrimaryGeneratorAction::GetParticleGun()
0093 {
0094   return fParticleGun;
0095 }
0096
0097 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......