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25 //
26 //
27 /// \file B4/B4d/src/PrimaryGeneratorAction.cc
28 /// \brief Implementation of the B4::PrimaryGeneratorAction class
29
30 #include "PrimaryGeneratorAction.hh"
31
32 #include "G4Box.hh"
33 #include "G4LogicalVolume.hh"
34 #include "G4LogicalVolumeStore.hh"
35 #include "G4ParticleGun.hh"
36 #include "G4ParticleTable.hh"
37 #include "G4SystemOfUnits.hh"
38 #include "globals.hh"
39
40 namespace B4
41 {
42
43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44
45 PrimaryGeneratorAction::PrimaryGeneratorAction()
46 {
47 G4int nofParticles = 1;
48 fParticleGun = new G4ParticleGun(nofParticles);
49
50 // default particle kinematic
51 //
52 auto particleDefinition = G4ParticleTable::GetParticleTable()->FindParticle("e-");
53 fParticleGun->SetParticleDefinition(particleDefinition);
54 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
55 fParticleGun->SetParticleEnergy(300. * MeV);
56 }
57
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59
60 PrimaryGeneratorAction::~PrimaryGeneratorAction()
61 {
62 delete fParticleGun;
63 }
64
65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66
67 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* event)
68 {
69 // This function is called at the begining of event
70
71 // In order to avoid dependence of PrimaryGeneratorAction
72 // on DetectorConstruction class we get world volume
73 // from G4LogicalVolumeStore
74 //
75 G4double worldZHalfLength = 0.;
76 auto worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
77
78 // Check that the world volume has box shape
79 G4Box* worldBox = nullptr;
80 if (worldLV) {
81 worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
82 }
83
84 if (worldBox) {
85 worldZHalfLength = worldBox->GetZHalfLength();
86 }
87 else {
88 G4ExceptionDescription msg;
89 msg << "World volume of box shape not found." << G4endl;
90 msg << "Perhaps you have changed geometry." << G4endl;
91 msg << "The gun will be place in the center.";
92 G4Exception("PrimaryGeneratorAction::GeneratePrimaries()", "MyCode0002", JustWarning, msg);
93 }
94
95 // Set gun position
96 fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
97
98 fParticleGun->GeneratePrimaryVertex(event);
99 }
100
101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
102
103 } // namespace B4
104