Geant4  10.03.p03
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Par02PrimaryGeneratorAction.cc
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30 
32 #include "G4Event.hh"
33 #include "G4ParticleGun.hh"
34 #include "G4ParticleTable.hh"
35 #include "G4ParticleDefinition.hh"
37 #include "globals.hh"
38 #include "G4SystemOfUnits.hh"
39 
40 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
41 
43  G4int n_particle = 1;
44  fParticleGun = new G4ParticleGun( n_particle );
45 
47  G4String particleName;
48  G4ParticleDefinition* particle =
49  particleTable->FindParticle( particleName = "geantino" );
50  fParticleGun->SetParticleDefinition( particle );
51 
52  fParticleGun->SetParticleMomentumDirection( G4ThreeVector( 0.0, 1.0, 0.0 ) );
53  fParticleGun->SetParticleEnergy( 100.0*GeV );
54  fParticleGun->SetParticlePosition( G4ThreeVector( 0.0, 0.0, 0.0 ) );
55 }
56 
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58 
60  delete fParticleGun;
61 }
62 
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64 
66  fParticleGun->GeneratePrimaryVertex( anEvent );
67 
68  // Loop over the vertices, and then over primary particles,
69  // and for each primary particle create an info object, in
70  // which to store "Monte Carlo true" information.
71  // This approach could appear unnecessarily heavy in the present case
72  // of a trivial particle gun generator, but it is useful in the more
73  // realistic case of a Monte Carlo event generator like Pythia8.
74  G4int count_particles = 0;
75  for ( G4int ivtx = 0; ivtx < anEvent->GetNumberOfPrimaryVertex(); ivtx++ ) {
76  for ( G4int ipp = 0; ipp < anEvent->GetPrimaryVertex( ivtx )->GetNumberOfParticle();
77  ipp++ ) {
78  G4PrimaryParticle* primary_particle =
79  anEvent->GetPrimaryVertex( ivtx )->GetPrimary( ipp );
80  if ( primary_particle ) {
82  count_particles, primary_particle->GetPDGcode(),
83  primary_particle->GetMomentum() ) );
84  count_particles++;
85  }
86  }
87  }
88 }
89 
90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
91 
93  return fParticleGun;
94 }
95 
96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97 
G4int GetNumberOfParticle() const
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
G4ThreeVector GetMomentum() const
void SetUserInformation(G4VUserPrimaryParticleInformation *anInfo)
CLHEP::Hep3Vector G4ThreeVector
G4int GetNumberOfPrimaryVertex() const
Definition: G4Event.hh:164
Definition of the Par02PrimaryGeneratorAction class.
void SetParticleMomentumDirection(G4ParticleMomentum aMomentumDirection)
Definition of the Par02PrimaryParticleInformation class.
int G4int
Definition: G4Types.hh:78
virtual void GeneratePrimaryVertex(G4Event *evt)
G4PrimaryParticle * GetPrimary(G4int i=0) const
void SetParticlePosition(G4ThreeVector aPosition)
G4PrimaryVertex * GetPrimaryVertex(G4int i=0) const
Definition: G4Event.hh:167
G4int GetPDGcode() const
void SetParticleEnergy(G4double aKineticEnergy)
static G4ParticleTable * GetParticleTable()
static constexpr double GeV
Definition: G4SIunits.hh:217
void SetParticleDefinition(G4ParticleDefinition *aParticleDefinition)
virtual void GeneratePrimaries(G4Event *anEvent)