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25 //
26 //
27 /// \file Par02PrimaryGeneratorAction.cc
28 /// \brief Implementation of the Par02PrimaryGeneratorAction class
29
30 #include "Par02PrimaryGeneratorAction.hh"
31
32 #include "Par02PrimaryParticleInformation.hh"
33
34 #include "G4Event.hh"
35 #include "G4ParticleDefinition.hh"
36 #include "G4ParticleGun.hh"
37 #include "G4ParticleTable.hh"
38 #include "G4SystemOfUnits.hh"
39 #include "globals.hh"
40
41 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
42
43 Par02PrimaryGeneratorAction::Par02PrimaryGeneratorAction()
44 {
45 G4int n_particle = 1;
46 fParticleGun = new G4ParticleGun(n_particle);
47
48 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
49 G4String particleName;
50 G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "geantino");
51 fParticleGun->SetParticleDefinition(particle);
52
53 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.0, 1.0, 0.0));
54 fParticleGun->SetParticleEnergy(100.0 * GeV);
55 fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
56 }
57
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59
60 Par02PrimaryGeneratorAction::~Par02PrimaryGeneratorAction()
61 {
62 delete fParticleGun;
63 }
64
65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66
67 void Par02PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
68 {
69 fParticleGun->GeneratePrimaryVertex(anEvent);
70
71 // Loop over the vertices, and then over primary particles,
72 // and for each primary particle create an info object, in
73 // which to store "Monte Carlo true" information.
74 // This approach could appear unnecessarily heavy in the present case
75 // of a trivial particle gun generator, but it is useful in the more
76 // realistic case of a Monte Carlo event generator like Pythia8.
77 G4int count_particles = 0;
78 for (G4int ivtx = 0; ivtx < anEvent->GetNumberOfPrimaryVertex(); ivtx++) {
79 for (G4int ipp = 0; ipp < anEvent->GetPrimaryVertex(ivtx)->GetNumberOfParticle(); ipp++) {
80 G4PrimaryParticle* primary_particle = anEvent->GetPrimaryVertex(ivtx)->GetPrimary(ipp);
81 if (primary_particle) {
82 primary_particle->SetUserInformation(new Par02PrimaryParticleInformation(
83 count_particles, primary_particle->GetPDGcode(), primary_particle->GetMomentum()));
84 count_particles++;
85 }
86 }
87 }
88 }
89
90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
91
92 G4ParticleGun* Par02PrimaryGeneratorAction::GetParticleGun()
93 {
94 return fParticleGun;
95 }
96
97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
98