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25 //
26 //
27 /// \file optical/wls/src/WLSPrimaryGeneratorAction.cc
28 /// \brief Implementation of the WLSPrimaryGeneratorAction class
29 //
30 //
31
32 #include "WLSPrimaryGeneratorAction.hh"
33
34 #include "WLSDetectorConstruction.hh"
35 #include "WLSPrimaryGeneratorMessenger.hh"
36
37 #include "G4AutoLock.hh"
38 #include "G4Event.hh"
39 #include "G4GeneralParticleSource.hh"
40 #include "G4Material.hh"
41 #include "G4MaterialPropertiesTable.hh"
42 #include "G4OpticalPhoton.hh"
43 #include "G4PhysicsTable.hh"
44 #include "G4SystemOfUnits.hh"
45 #include "G4UImanager.hh"
46 #include "Randomize.hh"
47
48 namespace
49 {
50 G4Mutex gen_mutex = G4MUTEX_INITIALIZER;
51 }
52
53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54
55 G4bool WLSPrimaryGeneratorAction::fFirst = false;
56
57 WLSPrimaryGeneratorAction::WLSPrimaryGeneratorAction(WLSDetectorConstruction* dc)
58 {
59 fDetector = dc;
60
61 fParticleGun = new G4GeneralParticleSource();
62 fGunMessenger = new WLSPrimaryGeneratorMessenger(this);
63 }
64
65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66
67 WLSPrimaryGeneratorAction::~WLSPrimaryGeneratorAction()
68 {
69 delete fParticleGun;
70 delete fGunMessenger;
71 if (fIntegralTable) {
72 fIntegralTable->clearAndDestroy();
73 delete fIntegralTable;
74 }
75 }
76
77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78
79 void WLSPrimaryGeneratorAction::SetDecayTimeConstant(G4double time)
80 {
81 fTimeConstant = time;
82 }
83
84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
85
86 void WLSPrimaryGeneratorAction::BuildEmissionSpectrum()
87 {
88 if (fIntegralTable) return;
89
90 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
91 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
92
93 if (!fIntegralTable) fIntegralTable = new G4PhysicsTable(numOfMaterials);
94
95 for (G4int i = 0; i < numOfMaterials; ++i) {
96 auto vec = new G4PhysicsFreeVector();
97
98 G4MaterialPropertiesTable* MPT = (*theMaterialTable)[i]->GetMaterialPropertiesTable();
99
100 if (MPT) {
101 G4MaterialPropertyVector* theWLSVector = MPT->GetProperty("WLSCOMPONENT");
102
103 if (theWLSVector) {
104 G4double currentIN = (*theWLSVector)[0];
105 if (currentIN >= 0.0) {
106 G4double currentPM = theWLSVector->Energy(0);
107 G4double currentCII = 0.0;
108 vec->InsertValues(currentPM, currentCII);
109 G4double prevPM = currentPM;
110 G4double prevCII = currentCII;
111 G4double prevIN = currentIN;
112
113 for (size_t j = 1; j < theWLSVector->GetVectorLength(); ++j) {
114 currentPM = theWLSVector->Energy(j);
115 currentIN = (*theWLSVector)[j];
116 currentCII = 0.5 * (prevIN + currentIN);
117 currentCII = prevCII + (currentPM - prevPM) * currentCII;
118 vec->InsertValues(currentPM, currentCII);
119 prevPM = currentPM;
120 prevCII = currentCII;
121 prevIN = currentIN;
122 }
123 }
124 }
125 }
126 fIntegralTable->insertAt(i, vec);
127 }
128 }
129
130 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
131
132 void WLSPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
133 {
134 if (!fFirst) {
135 fFirst = true;
136 BuildEmissionSpectrum();
137 }
138
139 if (fUseSampledEnergy) {
140 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
141
142 G4double sampledEnergy = 3. * eV;
143
144 for (size_t j = 0; j < theMaterialTable->size(); ++j) {
145 G4Material* fMaterial = (*theMaterialTable)[j];
146 if (fMaterial->GetName() == "PMMA") {
147 auto WLSIntensity = fMaterial->GetMaterialPropertiesTable()->GetProperty("WLSCOMPONENT");
148
149 if (WLSIntensity) {
150 auto WLSIntegral = (G4PhysicsFreeVector*)((*fIntegralTable)(fMaterial->GetIndex()));
151
152 G4double CIImax = WLSIntegral->GetMaxValue();
153 G4double CIIvalue = G4UniformRand() * CIImax;
154
155 sampledEnergy = WLSIntegral->GetEnergy(CIIvalue);
156 }
157 }
158 }
159
160 // this does not work.
161 G4String cmd = "/gun/energy " + G4UIcommand::ConvertToString(sampledEnergy / eV) + " eV";
162 G4UImanager::GetUIpointer()->ApplyCommand(cmd);
163 }
164
165 // The code behind this line is not thread safe because polarization
166 // and time are randomly selected and GPS properties are global
167
168 G4AutoLock l(&gen_mutex);
169 if (fParticleGun->GetParticleDefinition() == G4OpticalPhoton::Definition()) {
170 SetOptPhotonPolar();
171 SetOptPhotonTime();
172 }
173
174 fParticleGun->GeneratePrimaryVertex(anEvent);
175 }
176
177 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
178
179 void WLSPrimaryGeneratorAction::SetOptPhotonPolar()
180 {
181 G4double angle = G4UniformRand() * 360.0 * deg;
182 SetOptPhotonPolar(angle);
183 }
184
185 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
186
187 void WLSPrimaryGeneratorAction::SetOptPhotonPolar(G4double angle)
188 {
189 if (fParticleGun->GetParticleDefinition()->GetParticleName() != "opticalphoton") {
190 G4cout << "-> warning from WLSPrimaryGeneratorAction::SetOptPhotonPolar()"
191 << ": the ParticleGun is not an opticalphoton" << G4endl;
192 return;
193 }
194
195 G4ThreeVector normal(1., 0., 0.);
196 G4ThreeVector kphoton = fParticleGun->GetParticleMomentumDirection();
197 G4ThreeVector product = normal.cross(kphoton);
198 G4double modul2 = product * product;
199
200 G4ThreeVector e_perpend(0., 0., 1.);
201 if (modul2 > 0.) e_perpend = (1. / std::sqrt(modul2)) * product;
202 G4ThreeVector e_paralle = e_perpend.cross(kphoton);
203
204 G4ThreeVector polar = std::cos(angle) * e_paralle + std::sin(angle) * e_perpend;
205 fParticleGun->SetParticlePolarization(polar);
206 }
207
208 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
209
210 void WLSPrimaryGeneratorAction::SetOptPhotonTime()
211 {
212 G4double time = -std::log(G4UniformRand()) * fTimeConstant;
213 fParticleGun->SetParticleTime(time);
214 }
215