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25 //
26 //
27 /// \file B1/src/PrimaryGeneratorAction.cc
28 /// \brief Implementation of the B1::PrimaryGeneratorAction class
29
30 #include "PrimaryGeneratorAction.hh"
31
32 #include "G4Box.hh"
33 #include "G4LogicalVolume.hh"
34 #include "G4LogicalVolumeStore.hh"
35 #include "G4ParticleDefinition.hh"
36 #include "G4ParticleGun.hh"
37 #include "G4ParticleTable.hh"
38 #include "G4RunManager.hh"
39 #include "G4SystemOfUnits.hh"
40 #include "Randomize.hh"
41
42 namespace B1
43 {
44
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
46
47 PrimaryGeneratorAction::PrimaryGeneratorAction()
48 {
49 G4int n_particle = 1;
50 fParticleGun = new G4ParticleGun(n_particle);
51
52 // default particle kinematic
53 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
54 G4String particleName;
55 G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "gamma");
56 fParticleGun->SetParticleDefinition(particle);
57 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
58 fParticleGun->SetParticleEnergy(6. * MeV);
59 }
60
61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
62
63 PrimaryGeneratorAction::~PrimaryGeneratorAction()
64 {
65 delete fParticleGun;
66 }
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
71 {
72 // this function is called at the begining of ecah event
73 //
74
75 // In order to avoid dependence of PrimaryGeneratorAction
76 // on DetectorConstruction class we get Envelope volume
77 // from G4LogicalVolumeStore.
78
79 G4double envSizeXY = 0;
80 G4double envSizeZ = 0;
81
82 if (!fEnvelopeBox) {
83 G4LogicalVolume* envLV = G4LogicalVolumeStore::GetInstance()->GetVolume("Envelope");
84 if (envLV) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
85 }
86
87 if (fEnvelopeBox) {
88 envSizeXY = fEnvelopeBox->GetXHalfLength() * 2.;
89 envSizeZ = fEnvelopeBox->GetZHalfLength() * 2.;
90 }
91 else {
92 G4ExceptionDescription msg;
93 msg << "Envelope volume of box shape not found.\n";
94 msg << "Perhaps you have changed geometry.\n";
95 msg << "The gun will be place at the center.";
96 G4Exception("PrimaryGeneratorAction::GeneratePrimaries()", "MyCode0002", JustWarning, msg);
97 }
98
99 G4double size = 0.8;
100 G4double x0 = size * envSizeXY * (G4UniformRand() - 0.5);
101 G4double y0 = size * envSizeXY * (G4UniformRand() - 0.5);
102 G4double z0 = -0.5 * envSizeZ;
103
104 fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
105
106 fParticleGun->GeneratePrimaryVertex(anEvent);
107 }
108
109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
110
111 } // namespace B1
112