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25 //
26 //
27 /// \file field/field06/src/F06PrimaryGeneratorAction.cc
28 /// \brief Implementation of the F06PrimaryGeneratorAction class
29 //
30
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
33
34 #include "F06PrimaryGeneratorAction.hh"
35
36 #include "F06DetectorConstruction.hh"
37
38 #include "G4Event.hh"
39 #include "G4ParticleDefinition.hh"
40 #include "G4ParticleGun.hh"
41 #include "G4ParticleTable.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh"
45
46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
47
48 F06PrimaryGeneratorAction::F06PrimaryGeneratorAction()
49 {
50 G4int n_particle = 1;
51 fParticleGun = new G4ParticleGun(n_particle);
52
53 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
54
55 G4ParticleDefinition* particle = particleTable->FindParticle("proton");
56 G4double mass_proton = particle->GetPDGMass();
57
58 G4double muN = 0.5 * CLHEP::eplus * CLHEP::hbar_Planck / (mass_proton / CLHEP::c_squared);
59
60 G4cout << " *** Neutron *** " << G4endl;
61
62 particle = particleTable->FindParticle("neutron");
63 G4double mass_neutron = particle->GetPDGMass();
64
65 G4double magneticMoment = particle->GetPDGMagneticMoment();
66 G4cout << " magneticMoment: " << magneticMoment / muN << G4endl;
67
68 // g_factor for spin 1/2
69
70 G4double g_factor = 2 * magneticMoment / muN;
71 G4cout << " g_factor: " << g_factor << G4endl;
72
73 G4double charge = particle->GetPDGCharge();
74 G4cout << " charge: " << charge << G4endl;
75
76 G4double anomaly = (g_factor - 2.) / 2.;
77 G4cout << " anomaly: " << anomaly << G4endl;
78
79 anomaly = (g_factor * (mass_neutron / mass_proton) - 2.) / 2.;
80 G4cout << " corrected anomaly: " << anomaly << G4endl;
81
82 muN = 0.5 * CLHEP::eplus * CLHEP::hbar_Planck / (mass_neutron / CLHEP::c_squared);
83 g_factor = 2 * magneticMoment / muN;
84
85 anomaly = (g_factor - 2.) / 2.;
86 G4cout << " *** anomaly: " << anomaly << G4endl;
87
88 G4cout << " *** MuonPlus *** " << G4endl;
89
90 particle = particleTable->FindParticle("mu+");
91 G4double mass_muon = particle->GetPDGMass();
92
93 G4double muB = 0.5 * CLHEP::eplus * CLHEP::hbar_Planck / (mass_muon / CLHEP::c_squared);
94
95 magneticMoment = particle->GetPDGMagneticMoment();
96 G4cout << " magneticMoment: " << magneticMoment / muB << G4endl;
97
98 // g_factor for spin 1/2
99
100 g_factor = magneticMoment / muB;
101 G4cout << " g_factor: " << g_factor << G4endl;
102
103 charge = particle->GetPDGCharge();
104 G4cout << " charge: " << charge << G4endl;
105
106 anomaly = (g_factor - 2.) / 2.;
107 G4cout << " anomaly: " << anomaly << G4endl;
108
109 // anomaly = particle->CalculateAnomaly();
110 // G4cout << " *** anomaly: " << anomaly << G4endl;
111
112 particle = particleTable->FindParticle("neutron");
113 fParticleGun->SetParticleDefinition(particle);
114 }
115
116 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
117
118 F06PrimaryGeneratorAction::~F06PrimaryGeneratorAction()
119 {
120 delete fParticleGun;
121 }
122
123 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124
125 void F06PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
126 {
127 // this function is called at the begining of event
128 //
129
130 fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
131 fParticleGun->SetParticlePolarization(G4ThreeVector(0, 1, 0));
132
133 G4double particleEnergy = G4UniformRand() * 1e-7 * eV;
134 fParticleGun->SetParticleEnergy(particleEnergy);
135
136 G4double theta = 2 * pi * G4UniformRand();
137 G4double phi = std::acos(1 - 2 * G4UniformRand());
138 if (phi > pi / 2 && phi < pi) phi = pi - phi;
139
140 G4double z = std::sin(phi) * std::cos(theta);
141 G4double x = std::sin(phi) * std::sin(theta);
142 G4double y = std::cos(phi);
143
144 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(x, y, z));
145
146 fParticleGun->GeneratePrimaryVertex(anEvent);
147 }
148
149 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
150