Par02/src/Par02PrimaryGeneratorAction.cc

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0025 //
0026 /// \file Par02PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the Par02PrimaryGeneratorAction class
0028
0029 #include "Par02PrimaryGeneratorAction.hh"
0030
0031 #include "Par02PrimaryParticleInformation.hh"
0032
0033 #include "G4Event.hh"
0034 #include "G4ParticleDefinition.hh"
0035 #include "G4ParticleGun.hh"
0036 #include "G4ParticleTable.hh"
0037 #include "G4SystemOfUnits.hh"
0038 #include "globals.hh"
0039
0040 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0041
0042 Par02PrimaryGeneratorAction::Par02PrimaryGeneratorAction()
0043 {
0044   G4int n_particle = 1;
0045   fParticleGun = new G4ParticleGun(n_particle);
0046
0047   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0048   G4String particleName;
0049   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "geantino");
0050   fParticleGun->SetParticleDefinition(particle);
0051
0052   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.0, 1.0, 0.0));
0053   fParticleGun->SetParticleEnergy(100.0 * GeV);
0054   fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
0055 }
0056
0057 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0058
0059 Par02PrimaryGeneratorAction::~Par02PrimaryGeneratorAction()
0060 {
0061   delete fParticleGun;
0062 }
0063
0064 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0065
0066 void Par02PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0067 {
0068   fParticleGun->GeneratePrimaryVertex(anEvent);
0069
0070   // Loop over the vertices, and then over primary particles,
0071   // and for each primary particle create an info object, in
0072   // which to store "Monte Carlo true" information.
0073   // This approach could appear unnecessarily heavy in the present case
0074   // of a trivial particle gun generator, but it is useful in the more
0075   // realistic case of a Monte Carlo event generator like Pythia8.
0076   G4int count_particles = 0;
0077   for (G4int ivtx = 0; ivtx < anEvent->GetNumberOfPrimaryVertex(); ivtx++) {
0078     for (G4int ipp = 0; ipp < anEvent->GetPrimaryVertex(ivtx)->GetNumberOfParticle(); ipp++) {
0079       G4PrimaryParticle* primary_particle = anEvent->GetPrimaryVertex(ivtx)->GetPrimary(ipp);
0080       if (primary_particle) {
0081         primary_particle->SetUserInformation(new Par02PrimaryParticleInformation(
0082           count_particles, primary_particle->GetPDGcode(), primary_particle->GetMomentum()));
0083         count_particles++;
0084       }
0085     }
0086   }
0087 }
0088
0089 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0090
0091 G4ParticleGun* Par02PrimaryGeneratorAction::GetParticleGun()
0092 {
0093   return fParticleGun;
0094 }
0095
0096 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......