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25 //
26 /// \file PrimaryGeneratorAction.cc
27 /// \brief Implementation of the PrimaryGeneratorAction class
28 //
29 //
30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32
33 #include "PrimaryGeneratorAction.hh"
34
35 #include "DetectorConstruction.hh"
36 #include "PrimaryGeneratorMessenger.hh"
37
38 #include "G4Event.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "Randomize.hh"
44
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
46
47 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det) : fDetector(det)
48 {
49 fParticleGun = new G4ParticleGun(1);
50 SetDefaultKinematic();
51
52 // create a messenger for this class
53 fGunMessenger = new PrimaryGeneratorMessenger(this);
54 }
55
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57
58 PrimaryGeneratorAction::~PrimaryGeneratorAction()
59 {
60 delete fParticleGun;
61 delete fGunMessenger;
62 }
63
64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
65
66 void PrimaryGeneratorAction::SetDefaultKinematic()
67 {
68 G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
69 fParticleGun->SetParticleDefinition(particle);
70 fParticleGun->SetParticleEnergy(500 * keV);
71 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
72 G4double position = -0.45 * (fDetector->GetWorldSizeX());
73 fParticleGun->SetParticlePosition(G4ThreeVector(position, 0. * cm, 0. * cm));
74 }
75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76
77 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
78 {
79 // this function is called at the begining of event
80
81 // randomize the beam, if requested.
82 //
83 if (fRndmBeam > 0.) {
84 G4ThreeVector oldPosition = fParticleGun->GetParticlePosition();
85 if (fRndmBeam > fDetector->GetAbsorSizeYZ()) fRndmBeam = fDetector->GetAbsorSizeYZ();
86 G4double rbeam = 0.5 * fRndmBeam;
87 G4double x0 = oldPosition.x();
88 G4double y0 = oldPosition.y() + (2 * G4UniformRand() - 1.) * rbeam;
89 G4double z0 = oldPosition.z() + (2 * G4UniformRand() - 1.) * rbeam;
90 fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
91 fParticleGun->GeneratePrimaryVertex(anEvent);
92 fParticleGun->SetParticlePosition(oldPosition);
93 }
94
95 else
96 fParticleGun->GeneratePrimaryVertex(anEvent);
97 }
98
99 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
100