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25 //
26 //
27 /// \file B2PrimaryGeneratorAction.cc
28 /// \brief Implementation of the B2PrimaryGeneratorAction class
29
30 #include "B2PrimaryGeneratorAction.hh"
31
32 #include "G4Box.hh"
33 #include "G4Event.hh"
34 #include "G4LogicalVolume.hh"
35 #include "G4LogicalVolumeStore.hh"
36 #include "G4ParticleDefinition.hh"
37 #include "G4ParticleGun.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4SystemOfUnits.hh"
40 #include "Randomize.hh"
41
42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
43
44 B2PrimaryGeneratorAction::B2PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
45 {
46 G4int nofParticles = 1;
47 fParticleGun = new G4ParticleGun(nofParticles);
48
49 // default particle kinematic
50
51 G4ParticleDefinition* particleDefinition =
52 G4ParticleTable::GetParticleTable()->FindParticle("proton");
53
54 fParticleGun->SetParticleDefinition(particleDefinition);
55 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
56 fParticleGun->SetParticleEnergy(3.0 * GeV);
57 }
58
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60
61 B2PrimaryGeneratorAction::~B2PrimaryGeneratorAction()
62 {
63 delete fParticleGun;
64 }
65
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67
68 void B2PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
69 {
70 // This function is called at the begining of event
71
72 // In order to avoid dependence of PrimaryGeneratorAction
73 // on DetectorConstruction class we get world volume
74 // from G4LogicalVolumeStore.
75
76 G4double worldZHalfLength = 0;
77 G4LogicalVolume* worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
78 G4Box* worldBox = NULL;
79 if (worldLV) worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
80 if (worldBox)
81 worldZHalfLength = worldBox->GetZHalfLength();
82 else {
83 G4cerr << "World volume of box not found." << G4endl;
84 G4cerr << "Perhaps you have changed geometry." << G4endl;
85 G4cerr << "The gun will be place in the center." << G4endl;
86 }
87
88 fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
89
90 fParticleGun->GeneratePrimaryVertex(anEvent);
91 }
92
93 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94