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B2PrimaryGeneratorAction.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file B2PrimaryGeneratorAction.cc
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29 
30 #include "B2PrimaryGeneratorAction.hh"
31 
32 #include "G4LogicalVolumeStore.hh"
33 #include "G4LogicalVolume.hh"
34 #include "G4Box.hh"
35 #include "G4Event.hh"
36 #include "G4ParticleGun.hh"
37 #include "G4ParticleTable.hh"
38 #include "G4ParticleDefinition.hh"
39 #include "G4SystemOfUnits.hh"
40 
41 #include "Randomize.hh"
42 
43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 
47 {
48  G4int nofParticles = 1;
49  fParticleGun = new G4ParticleGun(nofParticles);
50 
51  // default particle kinematic
52 
53  G4ParticleDefinition* particleDefinition
55 
56  fParticleGun->SetParticleDefinition(particleDefinition);
59 }
60 
61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
62 
64 {
65  delete fParticleGun;
66 }
67 
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69 
71 {
72  // This function is called at the begining of event
73 
74  // In order to avoid dependence of PrimaryGeneratorAction
75  // on DetectorConstruction class we get world volume
76  // from G4LogicalVolumeStore.
77 
78  G4double worldZHalfLength = 0;
79  G4LogicalVolume* worldLV
81  G4Box* worldBox = NULL;
82  if ( worldLV ) worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
83  if ( worldBox ) worldZHalfLength = worldBox->GetZHalfLength();
84  else {
85  G4cerr << "World volume of box not found." << G4endl;
86  G4cerr << "Perhaps you have changed geometry." << G4endl;
87  G4cerr << "The gun will be place in the center." << G4endl;
88  }
89 
90  // Note that this particular case of starting a primary particle on the world boundary
91  // requires shooting in a direction towards inside the world.
92  fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
93 
95 }
96 
97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......