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OpNovicePrimaryGeneratorAction.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file OpNovicePrimaryGeneratorAction.cc
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33 
34 #include "OpNovicePrimaryGeneratorAction.hh"
35 #include "OpNovicePrimaryGeneratorMessenger.hh"
36 
37 #include "Randomize.hh"
38 
39 #include "G4Event.hh"
40 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4ParticleDefinition.hh"
43 #include "G4SystemOfUnits.hh"
44 
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
46 
47 OpNovicePrimaryGeneratorAction::OpNovicePrimaryGeneratorAction()
48  : G4VUserPrimaryGeneratorAction(),
49  fParticleGun(0)
50 {
51  G4int n_particle = 1;
52  fParticleGun = new G4ParticleGun(n_particle);
53 
54  //create a messenger for this class
55  fGunMessenger = new OpNovicePrimaryGeneratorMessenger(this);
56 
57  //default kinematic
58  //
59  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
60  G4ParticleDefinition* particle = particleTable->FindParticle("e+");
61 
62  fParticleGun->SetParticleDefinition(particle);
63  fParticleGun->SetParticleTime(0.0*ns);
64  fParticleGun->SetParticlePosition(G4ThreeVector(0.0*cm,0.0*cm,0.0*cm));
65  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
66  fParticleGun->SetParticleEnergy(500.0*keV);
67 }
68 
69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70 
71 OpNovicePrimaryGeneratorAction::~OpNovicePrimaryGeneratorAction()
72 {
73  delete fParticleGun;
74  delete fGunMessenger;
75 }
76 
77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78 
79 void OpNovicePrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
80 {
81  fParticleGun->GeneratePrimaryVertex(anEvent);
82 }
83 
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85 
86 void OpNovicePrimaryGeneratorAction::SetOptPhotonPolar()
87 {
88  G4double angle = G4UniformRand() * 360.0*deg;
89  SetOptPhotonPolar(angle);
90 }
91 
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93 
94 void OpNovicePrimaryGeneratorAction::SetOptPhotonPolar(G4double angle)
95 {
96  if (fParticleGun->GetParticleDefinition()->GetParticleName()!="opticalphoton")
97  {
98  G4cout << "--> warning from PrimaryGeneratorAction::SetOptPhotonPolar() :"
99  "the particleGun is not an opticalphoton" << G4endl;
100  return;
101  }
102 
103  G4ThreeVector normal (1., 0., 0.);
104  G4ThreeVector kphoton = fParticleGun->GetParticleMomentumDirection();
105  G4ThreeVector product = normal.cross(kphoton);
106  G4double modul2 = product*product;
107 
108  G4ThreeVector e_perpend (0., 0., 1.);
109  if (modul2 > 0.) e_perpend = (1./std::sqrt(modul2))*product;
110  G4ThreeVector e_paralle = e_perpend.cross(kphoton);
111 
112  G4ThreeVector polar = std::cos(angle)*e_paralle + std::sin(angle)*e_perpend;
113  fParticleGun->SetParticlePolarization(polar);
114 }
115 
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