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25 //
26 //
27 /// \file PrimaryGeneratorAction.cc
28 /// \brief Implementation of the PrimaryGeneratorAction class
29
30 #include "PrimaryGeneratorAction.hh"
31
32 #include "G4Box.hh"
33 #include "G4Event.hh"
34 #include "G4LogicalVolume.hh"
35 #include "G4LogicalVolumeStore.hh"
36 #include "G4ParticleGun.hh"
37 #include "G4ParticleTable.hh"
38 #include "G4Proton.hh"
39 #include "G4RunManager.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "Randomize.hh"
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 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
52 fParticleGun->SetParticleEnergy(1. * GeV);
53 fParticleGun->SetParticleDefinition(G4Proton::Proton());
54 }
55
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57
58 PrimaryGeneratorAction::~PrimaryGeneratorAction()
59 {
60 delete fParticleGun;
61 }
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64
65 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
66 {
67 // This function is called at the begining of event
68
69 // In order to avoid dependence of PrimaryGeneratorAction
70 // on DetectorConstruction class we get world volume
71 // from G4LogicalVolumeStore
72 //
73 G4double worldZHalfLength = 0.;
74 auto worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
75
76 // Check that the world volume has box shape
77 G4Box* worldBox = nullptr;
78 if (worldLV) {
79 worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
80 }
81
82 if (worldBox) {
83 worldZHalfLength = worldBox->GetZHalfLength();
84 }
85 else {
86 G4ExceptionDescription msg;
87 msg << "World volume of box shape not found." << G4endl;
88 msg << "Perhaps you have changed geometry." << G4endl;
89 msg << "The gun will be place in the center.";
90 G4Exception("PrimaryGeneratorAction::GeneratePrimaries()", "MyCode0002", JustWarning, msg);
91 }
92
93 // Set gun position
94 fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
95
96 fParticleGun->GeneratePrimaryVertex(anEvent);
97 }
98
99 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
100