| Geant4 Cross Reference |
1 //
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25 //
26 //
27 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
28 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
29
30 #include "PrimaryGeneratorAction.hh"
31
32 #include "PrimaryGeneratorMessenger.hh"
33 #include "DetectorConstruction.hh"
34
35 #include "G4SystemOfUnits.hh"
36 #include "G4Event.hh"
37 #include "G4ParticleGun.hh"
38 #include "G4ParticleTable.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "Randomize.hh"
41
42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
43
44 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
45 :Detector(det)
46 {
47 G4int n_particle = 1;
48 particleGun = new G4ParticleGun(n_particle);
49 SetDefaultKinematic();
50 beam = 0.*mm;
51
52 //create a messenger for this class
53 gunMessenger = new PrimaryGeneratorMessenger(this);
54 }
55
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57
58 PrimaryGeneratorAction::~PrimaryGeneratorAction()
59 {
60 delete particleGun;
61 delete gunMessenger;
62 }
63
64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
65
66 void PrimaryGeneratorAction::SetDefaultKinematic()
67 {
68 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
69 G4String particleName;
70 G4ParticleDefinition* particle
71 = particleTable->FindParticle(particleName="e-");
72 particleGun->SetParticleDefinition(particle);
73 particleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
74 particleGun->SetParticleEnergy(1.*GeV);
75 G4double position = -0.5*(Detector->GetWorldSizeX());
76 particleGun->SetParticlePosition(G4ThreeVector(position,0.*mm,0.*mm));
77 }
78
79 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
80
81 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
82 {
83 //this function is called at the begining of event
84 //
85 //randomize beam, if requested.
86 //
87 if (beam > 0.)
88 {
89 G4ThreeVector position = particleGun->GetParticlePosition();
90 G4double maxYZ = 0.49*(Detector->GetCalorSizeYZ());
91 G4double x0 = position.x();
92 G4double y0 = position.y() + (G4UniformRand()-0.5)*beam;
93 G4double z0 = position.z() + (G4UniformRand()-0.5)*beam;
94 if (std::abs(y0) > maxYZ) y0 = maxYZ;
95 if (std::abs(z0) > maxYZ) z0 = maxYZ;
96 particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
97 particleGun->GeneratePrimaryVertex(anEvent);
98 particleGun->SetParticlePosition(position);
99 }
100 else particleGun->GeneratePrimaryVertex(anEvent);
101 }
102
103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
104
105