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26 // Author: Sebastien Incerti << 26 // $Id: G4LivermoreGammaConversionModel.cc,v 1.8 2009/06/11 15:47:08 mantero Exp $
27 // 22 January 2012 << 27 // GEANT4 tag $Name: geant4-09-03-patch-01 $
28 // on base of G4LivermoreGammaConversi <<
29 // and G4LivermoreRayleighModel (MT ve <<
30 // 28 //
31 // Modifications: Zhuxin Li@CENBG << 29 //
32 // 11 March 2020 << 30 // Author: Sebastien Inserti
33 // derives from G4PairProductio << 31 // 30 October 2008
34 // ------------------------------------------- << 32 //
>> 33 // History:
>> 34 // --------
>> 35 // 12 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries:
>> 36 // - apply internal high-energy limit only in constructor
>> 37 // - do not apply low-energy limit (default is 0)
>> 38 // - use CLHEP electron mass for low-enegry limit
>> 39 // - remove MeanFreePath method and table
>> 40
35 41
36 #include "G4LivermoreGammaConversionModel.hh" 42 #include "G4LivermoreGammaConversionModel.hh"
37 43
38 #include "G4AutoLock.hh" << 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
39 #include "G4Electron.hh" <<
40 #include "G4EmParameters.hh" <<
41 #include "G4Exp.hh" <<
42 #include "G4ParticleChangeForGamma.hh" <<
43 #include "G4PhysicalConstants.hh" <<
44 #include "G4PhysicsFreeVector.hh" <<
45 #include "G4SystemOfUnits.hh" <<
46 45
47 namespace << 46 using namespace std;
48 { <<
49 G4Mutex LivermoreGammaConversionModelMutex = G <<
50 } <<
51 47
52 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
53 //....oooOO0OOooo........oooOO0OOooo........oo <<
54 <<
55 G4PhysicsFreeVector* G4LivermoreGammaConversio <<
56 G4String G4LivermoreGammaConversionModel::gDat <<
57 49
58 G4LivermoreGammaConversionModel::G4LivermoreGa << 50 G4LivermoreGammaConversionModel::G4LivermoreGammaConversionModel(const G4ParticleDefinition*,
59 << 51 const G4String& nam)
60 : G4PairProductionRelModel(p, nam) << 52 :G4VEmModel(nam),smallEnergy(2.*MeV),isInitialised(false),
61 { << 53 crossSectionHandler(0),meanFreePathTable(0)
62 fParticleChange = nullptr; << 54 {
63 lowEnergyLimit = 2. * CLHEP::electron_mass_c << 55 lowEnergyLimit = 2.0*electron_mass_c2;
64 verboseLevel = 0; << 56 highEnergyLimit = 100 * GeV;
65 // Verbosity scale for debugging purposes: << 57 SetHighEnergyLimit(highEnergyLimit);
66 // 0 = nothing << 58
67 // 1 = calculation of cross sections, file o << 59 verboseLevel= 0;
68 // 2 = entering in methods << 60 // Verbosity scale:
69 if (verboseLevel > 0) { << 61 // 0 = nothing
70 G4cout << "G4LivermoreGammaConversionModel << 62 // 1 = warning for energy non-conservation
>> 63 // 2 = details of energy budget
>> 64 // 3 = calculation of cross sections, file openings, sampling of atoms
>> 65 // 4 = entering in methods
>> 66
>> 67 if(verboseLevel > 0) {
>> 68 G4cout << "Livermore Gamma conversion is constructed " << G4endl
>> 69 << "Energy range: "
>> 70 << lowEnergyLimit / MeV << " MeV - "
>> 71 << highEnergyLimit / GeV << " GeV"
>> 72 << G4endl;
71 } 73 }
72 } 74 }
73 75
74 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75 77
76 G4LivermoreGammaConversionModel::~G4LivermoreG 78 G4LivermoreGammaConversionModel::~G4LivermoreGammaConversionModel()
77 { << 79 {
78 if (IsMaster()) { << 80 if (crossSectionHandler) delete crossSectionHandler;
79 for (G4int i = 0; i <= maxZ; ++i) { <<
80 if (data[i]) { <<
81 delete data[i]; <<
82 data[i] = nullptr; <<
83 } <<
84 } <<
85 } <<
86 } 81 }
87 82
88 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
89 84
90 void G4LivermoreGammaConversionModel::Initiali << 85 void
91 << 86 G4LivermoreGammaConversionModel::Initialise(const G4ParticleDefinition*,
>> 87 const G4DataVector&)
92 { 88 {
93 G4PairProductionRelModel::Initialise(particl << 89 if (verboseLevel > 3)
94 if (verboseLevel > 1) { << 90 G4cout << "Calling G4LivermoreGammaConversionModel::Initialise()" << G4endl;
95 G4cout << "Calling Initialise() of G4Liver <<
96 << "Energy range: " << LowEnergyLim <<
97 << " GeV isMater: " << IsMaster() < <<
98 } <<
99 91
100 if (IsMaster()) { << 92 if (crossSectionHandler)
101 // Initialise element selector << 93 {
102 InitialiseElementSelectors(particle, cuts) << 94 crossSectionHandler->Clear();
103 << 95 delete crossSectionHandler;
104 // Access to elements << 96 }
105 const G4ElementTable* elemTable = G4Elemen << 97
106 std::size_t numElems = (*elemTable).size() << 98 // Read data tables for all materials
107 for (std::size_t ie = 0; ie < numElems; ++ << 99
108 const G4Element* elem = (*elemTable)[ie] << 100 crossSectionHandler = new G4CrossSectionHandler();
109 const G4int Z = std::min(maxZ, elem->Get << 101 crossSectionHandler->Initialise(0,lowEnergyLimit,100.*GeV,400);
110 if (data[Z] == nullptr) { << 102 G4String crossSectionFile = "pair/pp-cs-";
111 ReadData(Z); << 103 crossSectionHandler->LoadData(crossSectionFile);
112 } << 104
113 } << 105 //
114 } << 106
115 if (isInitialised) { << 107 if (verboseLevel > 2)
116 return; << 108 G4cout << "Loaded cross section files for PenelopeGammaConversion" << G4endl;
>> 109
>> 110 if (verboseLevel > 0) {
>> 111 G4cout << "Livermore Gamma Conversion model is initialized " << G4endl
>> 112 << "Energy range: "
>> 113 << LowEnergyLimit() / MeV << " MeV - "
>> 114 << HighEnergyLimit() / GeV << " GeV"
>> 115 << G4endl;
117 } 116 }
>> 117
>> 118 if(isInitialised) return;
118 fParticleChange = GetParticleChangeForGamma( 119 fParticleChange = GetParticleChangeForGamma();
119 isInitialised = true; 120 isInitialised = true;
120 } 121 }
121 122
122 //....oooOO0OOooo........oooOO0OOooo........oo 123 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
123 124
124 const G4String& G4LivermoreGammaConversionMode << 125 G4double
>> 126 G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
>> 127 G4double GammaEnergy,
>> 128 G4double Z, G4double,
>> 129 G4double, G4double)
125 { 130 {
126 // no check in this method - environment var << 131 if (verboseLevel > 3) {
127 if (gDataDirectory.empty()) { << 132 G4cout << "Calling ComputeCrossSectionPerAtom() of G4LivermoreGammaConversionModel"
128 auto param = G4EmParameters::Instance(); << 133 << G4endl;
129 std::ostringstream ost; <<
130 if (param->LivermoreDataDir() == "livermor <<
131 ost << param->GetDirLEDATA() << "/liverm <<
132 useSpline = true; <<
133 } <<
134 else { <<
135 ost << param->GetDirLEDATA() << "/epics2 <<
136 } <<
137 gDataDirectory = ost.str(); <<
138 } 134 }
139 return gDataDirectory; << 135 if (GammaEnergy < lowEnergyLimit || GammaEnergy > highEnergyLimit) return 0;
>> 136
>> 137 G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy);
>> 138 return cs;
140 } 139 }
141 140
142 //....oooOO0OOooo........oooOO0OOooo........oo 141 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
143 142
144 void G4LivermoreGammaConversionModel::ReadData << 143 void G4LivermoreGammaConversionModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
>> 144 const G4MaterialCutsCouple* couple,
>> 145 const G4DynamicParticle* aDynamicGamma,
>> 146 G4double,
>> 147 G4double)
145 { 148 {
146 if (verboseLevel > 1) { <<
147 G4cout << "Calling ReadData() of G4Livermo <<
148 } <<
149 <<
150 if (data[Z] != nullptr) { <<
151 return; <<
152 } <<
153 <<
154 std::ostringstream ost; <<
155 ost << FindDirectoryPath() << "pp-cs-" << Z <<
156 149
157 data[Z] = new G4PhysicsFreeVector(useSpline) << 150 // The energies of the e+ e- secondaries are sampled using the Bethe - Heitler
158 << 151 // cross sections with Coulomb correction. A modified version of the random
159 std::ifstream fin(ost.str().c_str()); << 152 // number techniques of Butcher & Messel is used (Nuc Phys 20(1960),15).
>> 153
>> 154 // Note 1 : Effects due to the breakdown of the Born approximation at low
>> 155 // energy are ignored.
>> 156 // Note 2 : The differential cross section implicitly takes account of
>> 157 // pair creation in both nuclear and atomic electron fields. However triplet
>> 158 // prodution is not generated.
>> 159
>> 160 if (verboseLevel > 3)
>> 161 G4cout << "Calling SampleSecondaries() of G4LivermoreGammaConversionModel" << G4endl;
>> 162
>> 163 G4double photonEnergy = aDynamicGamma->GetKineticEnergy();
>> 164 G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection();
>> 165
>> 166 G4double epsilon ;
>> 167 G4double epsilon0 = electron_mass_c2 / photonEnergy ;
>> 168
>> 169 // Do it fast if photon energy < 2. MeV
>> 170 if (photonEnergy < smallEnergy )
>> 171 {
>> 172 epsilon = epsilon0 + (0.5 - epsilon0) * G4UniformRand();
>> 173 }
>> 174 else
>> 175 {
>> 176 // Select randomly one element in the current material
>> 177 //const G4Element* element = crossSectionHandler->SelectRandomElement(couple,photonEnergy);
>> 178 const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition();
>> 179 const G4Element* element = SelectRandomAtom(couple,particle,photonEnergy);
>> 180
>> 181 if (element == 0)
>> 182 {
>> 183 G4cout << "G4LivermoreGammaConversionModel::SampleSecondaries - element = 0"
>> 184 << G4endl;
>> 185 return;
>> 186 }
>> 187 G4IonisParamElm* ionisation = element->GetIonisation();
>> 188 if (ionisation == 0)
>> 189 {
>> 190 G4cout << "G4LivermoreGammaConversionModel::SampleSecondaries - ionisation = 0"
>> 191 << G4endl;
>> 192 return;
>> 193 }
>> 194
>> 195 // Extract Coulomb factor for this Element
>> 196 G4double fZ = 8. * (ionisation->GetlogZ3());
>> 197 if (photonEnergy > 50. * MeV) fZ += 8. * (element->GetfCoulomb());
>> 198
>> 199 // Limits of the screening variable
>> 200 G4double screenFactor = 136. * epsilon0 / (element->GetIonisation()->GetZ3()) ;
>> 201 G4double screenMax = std::exp ((42.24 - fZ)/8.368) - 0.952 ;
>> 202 G4double screenMin = std::min(4.*screenFactor,screenMax) ;
>> 203
>> 204 // Limits of the energy sampling
>> 205 G4double epsilon1 = 0.5 - 0.5 * std::sqrt(1. - screenMin / screenMax) ;
>> 206 G4double epsilonMin = std::max(epsilon0,epsilon1);
>> 207 G4double epsilonRange = 0.5 - epsilonMin ;
>> 208
>> 209 // Sample the energy rate of the created electron (or positron)
>> 210 G4double screen;
>> 211 G4double gReject ;
>> 212
>> 213 G4double f10 = ScreenFunction1(screenMin) - fZ;
>> 214 G4double f20 = ScreenFunction2(screenMin) - fZ;
>> 215 G4double normF1 = std::max(f10 * epsilonRange * epsilonRange,0.);
>> 216 G4double normF2 = std::max(1.5 * f20,0.);
>> 217
>> 218 do {
>> 219 if (normF1 / (normF1 + normF2) > G4UniformRand() )
>> 220 {
>> 221 epsilon = 0.5 - epsilonRange * std::pow(G4UniformRand(), 0.3333) ;
>> 222 screen = screenFactor / (epsilon * (1. - epsilon));
>> 223 gReject = (ScreenFunction1(screen) - fZ) / f10 ;
>> 224 }
>> 225 else
>> 226 {
>> 227 epsilon = epsilonMin + epsilonRange * G4UniformRand();
>> 228 screen = screenFactor / (epsilon * (1 - epsilon));
>> 229 gReject = (ScreenFunction2(screen) - fZ) / f20 ;
>> 230 }
>> 231 } while ( gReject < G4UniformRand() );
>> 232
>> 233 } // End of epsilon sampling
>> 234
>> 235 // Fix charges randomly
>> 236
>> 237 G4double electronTotEnergy;
>> 238 G4double positronTotEnergy;
>> 239
>> 240 if (CLHEP::RandBit::shootBit())
>> 241 {
>> 242 electronTotEnergy = (1. - epsilon) * photonEnergy;
>> 243 positronTotEnergy = epsilon * photonEnergy;
>> 244 }
>> 245 else
>> 246 {
>> 247 positronTotEnergy = (1. - epsilon) * photonEnergy;
>> 248 electronTotEnergy = epsilon * photonEnergy;
>> 249 }
160 250
161 if (!fin.is_open()) { << 251 // Scattered electron (positron) angles. ( Z - axis along the parent photon)
162 G4ExceptionDescription ed; << 252 // Universal distribution suggested by L. Urban (Geant3 manual (1993) Phys211),
163 ed << "G4LivermoreGammaConversionModel dat << 253 // derived from Tsai distribution (Rev. Mod. Phys. 49, 421 (1977)
164 << G4endl; << 254
165 G4Exception("G4LivermoreGammaConversionMod << 255 G4double u;
166 "G4LEDATA version should be G4 << 256 const G4double a1 = 0.625;
167 return; << 257 G4double a2 = 3. * a1;
168 } << 258 // G4double d = 27. ;
169 else { << 259
170 if (verboseLevel > 1) { << 260 // if (9. / (9. + d) > G4UniformRand())
171 G4cout << "File " << ost.str() << " is o << 261 if (0.25 > G4UniformRand())
>> 262 {
>> 263 u = - std::log(G4UniformRand() * G4UniformRand()) / a1 ;
>> 264 }
>> 265 else
>> 266 {
>> 267 u = - std::log(G4UniformRand() * G4UniformRand()) / a2 ;
172 } 268 }
173 269
174 data[Z]->Retrieve(fin, true); << 270 G4double thetaEle = u*electron_mass_c2/electronTotEnergy;
175 } << 271 G4double thetaPos = u*electron_mass_c2/positronTotEnergy;
176 // Activation of spline interpolation << 272 G4double phi = twopi * G4UniformRand();
177 if (useSpline) data[Z]->FillSecondDerivative << 273
>> 274 G4double dxEle= std::sin(thetaEle)*std::cos(phi),dyEle= std::sin(thetaEle)*std::sin(phi),dzEle=std::cos(thetaEle);
>> 275 G4double dxPos=-std::sin(thetaPos)*std::cos(phi),dyPos=-std::sin(thetaPos)*std::sin(phi),dzPos=std::cos(thetaPos);
>> 276
>> 277
>> 278 // Kinematics of the created pair:
>> 279 // the electron and positron are assumed to have a symetric angular
>> 280 // distribution with respect to the Z axis along the parent photon
>> 281
>> 282 G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
>> 283
>> 284 // SI - The range test has been removed wrt original G4LowEnergyGammaconversion class
>> 285
>> 286 G4ThreeVector electronDirection (dxEle, dyEle, dzEle);
>> 287 electronDirection.rotateUz(photonDirection);
>> 288
>> 289 G4DynamicParticle* particle1 = new G4DynamicParticle (G4Electron::Electron(),
>> 290 electronDirection,
>> 291 electronKineEnergy);
>> 292
>> 293 // The e+ is always created (even with kinetic energy = 0) for further annihilation
>> 294 G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
>> 295
>> 296 // SI - The range test has been removed wrt original G4LowEnergyGammaconversion class
>> 297
>> 298 G4ThreeVector positronDirection (dxPos, dyPos, dzPos);
>> 299 positronDirection.rotateUz(photonDirection);
>> 300
>> 301 // Create G4DynamicParticle object for the particle2
>> 302 G4DynamicParticle* particle2 = new G4DynamicParticle(G4Positron::Positron(),
>> 303 positronDirection, positronKineEnergy);
>> 304 // Fill output vector
>> 305 fvect->push_back(particle1);
>> 306 fvect->push_back(particle2);
>> 307
>> 308 // kill incident photon
>> 309 fParticleChange->SetProposedKineticEnergy(0.);
>> 310 fParticleChange->ProposeTrackStatus(fStopAndKill);
>> 311
178 } 312 }
179 313
180 //....oooOO0OOooo........oooOO0OOooo........oo 314 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
181 315
182 G4double << 316 G4double G4LivermoreGammaConversionModel::ScreenFunction1(G4double screenVariable)
183 G4LivermoreGammaConversionModel::ComputeCrossS <<
184 <<
185 <<
186 { 317 {
187 if (verboseLevel > 1) { << 318 // Compute the value of the screening function 3*phi1 - phi2
188 G4cout << "G4LivermoreGammaConversionModel <<
189 } <<
190 <<
191 if (GammaEnergy < lowEnergyLimit) { <<
192 return 0.0; <<
193 } <<
194 319
195 G4double xs = 0.0; << 320 G4double value;
>> 321
>> 322 if (screenVariable > 1.)
>> 323 value = 42.24 - 8.368 * std::log(screenVariable + 0.952);
>> 324 else
>> 325 value = 42.392 - screenVariable * (7.796 - 1.961 * screenVariable);
>> 326
>> 327 return value;
>> 328 }
196 329
197 G4int intZ = std::max(1, std::min(G4lrint(Z) << 330 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
198 <<
199 G4PhysicsFreeVector* pv = data[intZ]; <<
200 <<
201 // if element was not initialised <<
202 // do initialisation safely for MT mode <<
203 if (pv == nullptr) { <<
204 InitialiseForElement(particle, intZ); <<
205 pv = data[intZ]; <<
206 if (pv == nullptr) { <<
207 return xs; <<
208 } <<
209 } <<
210 // x-section is taken from the table <<
211 xs = pv->Value(GammaEnergy); <<
212 <<
213 if (verboseLevel > 0) { <<
214 G4cout << "*** Gamma conversion xs for Z=" <<
215 << " cs=" << xs / millibarn << " m <<
216 } <<
217 return xs; <<
218 } <<
219 <<
220 //....oooOO0OOooo........oooOO0OOooo........oo <<
221 331
222 void G4LivermoreGammaConversionModel::Initiali << 332 G4double G4LivermoreGammaConversionModel::ScreenFunction2(G4double screenVariable)
223 { 333 {
224 G4AutoLock l(&LivermoreGammaConversionModelM << 334 // Compute the value of the screening function 1.5*phi1 - 0.5*phi2
225 if (data[Z] == nullptr) { << 335
226 ReadData(Z); << 336 G4double value;
227 } << 337
228 l.unlock(); << 338 if (screenVariable > 1.)
229 } << 339 value = 42.24 - 8.368 * std::log(screenVariable + 0.952);
>> 340 else
>> 341 value = 41.405 - screenVariable * (5.828 - 0.8945 * screenVariable);
>> 342
>> 343 return value;
>> 344 }
230 345
231 //....oooOO0OOooo........oooOO0OOooo........oo <<
232 346