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25 //
26 //
27 /// \file field/field04/src/F04PrimaryGeneratorAction.cc
28 /// \brief Implementation of the F04PrimaryGeneratorAction class
29 //
30
31 #include "F04PrimaryGeneratorAction.hh"
32
33 #include "F04DetectorConstruction.hh"
34 #include "F04PrimaryGeneratorMessenger.hh"
35
36 #include "G4Event.hh"
37 #include "G4GeometryManager.hh"
38 #include "G4ParticleDefinition.hh"
39 #include "G4ParticleGun.hh"
40 #include "G4ParticleTable.hh"
41 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4TouchableHandle.hh"
44 #include "G4ios.hh"
45 #include "Randomize.hh"
46
47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
48
49 F04PrimaryGeneratorAction::F04PrimaryGeneratorAction(F04DetectorConstruction* detectorConstruction)
50 : fDetector(detectorConstruction)
51 {
52 G4int n_particle = 1;
53 fParticleGun = new G4ParticleGun(n_particle);
54
55 fGunMessenger = new F04PrimaryGeneratorMessenger(this);
56
57 G4String particleName;
58 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
59
60 fParticleGun->SetParticleDefinition(particleTable->FindParticle(particleName = "proton"));
61 fParticleGun->SetParticleEnergy(500. * MeV);
62 fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
63
64 fZvertex = -0.5 * (fDetector->GetTargetThickness());
65 fParticleGun->SetParticlePosition(G4ThreeVector(fXvertex, fYvertex, fZvertex));
66 }
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
69
70 F04PrimaryGeneratorAction::~F04PrimaryGeneratorAction()
71 {
72 delete fParticleGun;
73 delete fGunMessenger;
74 }
75
76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
77
78 void F04PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
79 {
80 if (!fFirst) {
81 fFirst = true;
82 G4ThreeVector direction(0.0, 0.0, 1.0);
83
84 G4Navigator* theNavigator =
85 G4TransportationManager::GetTransportationManager()->GetNavigatorForTracking();
86 if (theNavigator->GetWorldVolume()) {
87 auto aNavigator = new G4Navigator();
88 aNavigator->SetWorldVolume(theNavigator->GetWorldVolume());
89
90 G4ThreeVector center(0., 0., 0.);
91 aNavigator->LocateGlobalPointAndSetup(center, nullptr, false);
92
93 G4TouchableHandle touchable = aNavigator->CreateTouchableHistoryHandle();
94
95 // set Global2local transform
96 fGlobal2local = touchable->GetHistory()->GetTopTransform();
97
98 direction = fGlobal2local.Inverse().TransformAxis(direction);
99 delete aNavigator;
100 }
101
102 fParticleGun->SetParticleMomentumDirection(direction);
103 }
104
105 G4double x0, y0, z0;
106
107 if (fVertexDefined) {
108 x0 = fXvertex;
109 y0 = fYvertex;
110 z0 = fZvertex;
111 }
112 else {
113 x0 = 0.;
114 y0 = 0.;
115 z0 = -0.5 * (fDetector->GetTargetThickness());
116 }
117
118 G4double r0, phi0;
119
120 if (fRndmFlag == "on") {
121 r0 = (fDetector->GetTargetRadius()) * std::sqrt(G4UniformRand());
122 phi0 = twopi * G4UniformRand();
123 x0 = r0 * std::cos(phi0);
124 y0 = r0 * std::sin(phi0);
125 }
126
127 G4ThreeVector localPosition(x0, y0, z0);
128 G4ThreeVector globalPosition = fGlobal2local.Inverse().TransformPoint(localPosition);
129
130 fParticleGun->SetParticlePosition(globalPosition);
131 fParticleGun->GeneratePrimaryVertex(anEvent);
132 }
133
134 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
135
136 void F04PrimaryGeneratorAction::SetXvertex(G4double x)
137 {
138 fVertexDefined = true;
139 fXvertex = x;
140 G4cout << " X coordinate of the primary vertex = " << fXvertex / mm << " mm." << G4endl;
141 }
142
143 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
144
145 void F04PrimaryGeneratorAction::SetYvertex(G4double y)
146 {
147 fVertexDefined = true;
148 fYvertex = y;
149 G4cout << " Y coordinate of the primary vertex = " << fYvertex / mm << " mm." << G4endl;
150 }
151
152 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
153
154 void F04PrimaryGeneratorAction::SetZvertex(G4double z)
155 {
156 fVertexDefined = true;
157 fZvertex = z;
158 G4cout << " Z coordinate of the primary vertex = " << fZvertex / mm << " mm." << G4endl;
159 }
160