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B4PrimaryGeneratorAction.cc
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29 
30 #include "B4PrimaryGeneratorAction.hh"
31 
32 #include "G4RunManager.hh"
33 #include "G4LogicalVolumeStore.hh"
34 #include "G4LogicalVolume.hh"
35 #include "G4Box.hh"
36 #include "G4Event.hh"
37 #include "G4ParticleGun.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "Randomize.hh"
42 
43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 
47  fParticleGun(nullptr)
48 {
49  G4int nofParticles = 1;
50  fParticleGun = new G4ParticleGun(nofParticles);
51 
52  // default particle kinematic
53  //
54  auto particleDefinition
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  auto worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
80 
81  // Check that the world volume has box shape
82  G4Box* worldBox = nullptr;
83  if ( worldLV ) {
84  worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
85  }
86 
87  if ( worldBox ) {
88  worldZHalfLength = worldBox->GetZHalfLength();
89  }
90  else {
92  msg << "World volume of box shape not found." << G4endl;
93  msg << "Perhaps you have changed geometry." << G4endl;
94  msg << "The gun will be place in the center.";
95  G4Exception("B4PrimaryGeneratorAction::GeneratePrimaries()",
96  "MyCode0002", JustWarning, msg);
97  }
98 
99  // Set gun position
101  ->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
102 
104 }
105 
106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
107