Geant4 Cross Reference |
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Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 26 // 26 // 27 // Author: Luciano Pandola 27 // Author: Luciano Pandola 28 // 28 // 29 // History: 29 // History: 30 // -------- 30 // -------- 31 // 29 Oct 2008 L Pandola Migration from p 31 // 29 Oct 2008 L Pandola Migration from process to model 32 // 15 Apr 2009 V Ivanchenko Cleanup initiali 32 // 15 Apr 2009 V Ivanchenko Cleanup initialisation and generation of 33 // secondaries: 33 // secondaries: 34 // - apply internal high-ener 34 // - apply internal high-energy limit only in constructor 35 // - do not apply low-energy 35 // - do not apply low-energy limit (default is 0) 36 // - do not use G4ElementSele 36 // - do not use G4ElementSelector 37 // 02 Oct 2013 L.Pandola Migration to MT 37 // 02 Oct 2013 L.Pandola Migration to MT 38 38 39 #include "G4PenelopeAnnihilationModel.hh" 39 #include "G4PenelopeAnnihilationModel.hh" 40 #include "G4PhysicalConstants.hh" 40 #include "G4PhysicalConstants.hh" 41 #include "G4SystemOfUnits.hh" 41 #include "G4SystemOfUnits.hh" 42 #include "G4ParticleDefinition.hh" 42 #include "G4ParticleDefinition.hh" 43 #include "G4MaterialCutsCouple.hh" 43 #include "G4MaterialCutsCouple.hh" 44 #include "G4ProductionCutsTable.hh" 44 #include "G4ProductionCutsTable.hh" 45 #include "G4DynamicParticle.hh" 45 #include "G4DynamicParticle.hh" 46 #include "G4Gamma.hh" 46 #include "G4Gamma.hh" 47 47 48 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 49 49 50 G4double G4PenelopeAnnihilationModel::fPielr2 50 G4double G4PenelopeAnnihilationModel::fPielr2 = 0; 51 51 52 G4PenelopeAnnihilationModel::G4PenelopeAnnihil 52 G4PenelopeAnnihilationModel::G4PenelopeAnnihilationModel(const G4ParticleDefinition* part, 53 c 53 const G4String& nam) 54 :G4VEmModel(nam),fParticleChange(nullptr),fP 54 :G4VEmModel(nam),fParticleChange(nullptr),fParticle(nullptr),fIsInitialised(false) 55 { 55 { 56 fIntrinsicLowEnergyLimit = 0.0; 56 fIntrinsicLowEnergyLimit = 0.0; 57 fIntrinsicHighEnergyLimit = 100.0*GeV; 57 fIntrinsicHighEnergyLimit = 100.0*GeV; 58 SetHighEnergyLimit(fIntrinsicHighEnergyLimit 58 SetHighEnergyLimit(fIntrinsicHighEnergyLimit); 59 59 60 if (part) 60 if (part) 61 SetParticle(part); 61 SetParticle(part); 62 62 63 //Calculate variable that will be used later 63 //Calculate variable that will be used later on 64 fPielr2 = pi*classic_electr_radius*classic_e 64 fPielr2 = pi*classic_electr_radius*classic_electr_radius; 65 65 66 fVerboseLevel= 0; 66 fVerboseLevel= 0; 67 // Verbosity scale: 67 // Verbosity scale: 68 // 0 = nothing 68 // 0 = nothing 69 // 1 = warning for energy non-conservation 69 // 1 = warning for energy non-conservation 70 // 2 = details of energy budget 70 // 2 = details of energy budget 71 // 3 = calculation of cross sections, file o 71 // 3 = calculation of cross sections, file openings, sampling of atoms 72 // 4 = entering in methods 72 // 4 = entering in methods 73 } 73 } 74 74 75 //....oooOO0OOooo........oooOO0OOooo........oo 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 76 76 77 G4PenelopeAnnihilationModel::~G4PenelopeAnnihi 77 G4PenelopeAnnihilationModel::~G4PenelopeAnnihilationModel() 78 {;} 78 {;} 79 79 80 //....oooOO0OOooo........oooOO0OOooo........oo 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 81 81 82 void G4PenelopeAnnihilationModel::Initialise(c 82 void G4PenelopeAnnihilationModel::Initialise(const G4ParticleDefinition* part, 83 const G4DataVector&) 83 const G4DataVector&) 84 { 84 { 85 if (fVerboseLevel > 3) 85 if (fVerboseLevel > 3) 86 G4cout << "Calling G4PenelopeAnnihilationM 86 G4cout << "Calling G4PenelopeAnnihilationModel::Initialise()" << G4endl; 87 SetParticle(part); 87 SetParticle(part); 88 88 89 if (IsMaster() && part == fParticle) 89 if (IsMaster() && part == fParticle) 90 { 90 { 91 91 92 if(fVerboseLevel > 0) { 92 if(fVerboseLevel > 0) { 93 G4cout << "Penelope Annihilation model is in 93 G4cout << "Penelope Annihilation model is initialized " << G4endl 94 << "Energy range: " 94 << "Energy range: " 95 << LowEnergyLimit() / keV << " keV - 95 << LowEnergyLimit() / keV << " keV - " 96 << HighEnergyLimit() / GeV << " GeV" 96 << HighEnergyLimit() / GeV << " GeV" 97 << G4endl; 97 << G4endl; 98 } 98 } 99 } 99 } 100 100 101 if(fIsInitialised) return; 101 if(fIsInitialised) return; 102 fParticleChange = GetParticleChangeForGamma( 102 fParticleChange = GetParticleChangeForGamma(); 103 fIsInitialised = true; 103 fIsInitialised = true; 104 } 104 } 105 105 106 //....oooOO0OOooo........oooOO0OOooo........oo 106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 107 void G4PenelopeAnnihilationModel::InitialiseLo 107 void G4PenelopeAnnihilationModel::InitialiseLocal(const G4ParticleDefinition* part, 108 G4VEmModel* masterModel) 108 G4VEmModel* masterModel) 109 { 109 { 110 if (fVerboseLevel > 3) 110 if (fVerboseLevel > 3) 111 G4cout << "Calling G4PenelopeAnnihilationM 111 G4cout << "Calling G4PenelopeAnnihilationModel::InitialiseLocal()" << G4endl; 112 112 113 // 113 // 114 //Check that particle matches: one might hav 114 //Check that particle matches: one might have multiple master models (e.g. 115 //for e+ and e-). 115 //for e+ and e-). 116 // 116 // 117 if (part == fParticle) 117 if (part == fParticle) 118 { 118 { 119 //Get the const table pointers from the 119 //Get the const table pointers from the master to the workers 120 const G4PenelopeAnnihilationModel* theMo 120 const G4PenelopeAnnihilationModel* theModel = 121 static_cast<G4PenelopeAnnihilationMode 121 static_cast<G4PenelopeAnnihilationModel*> (masterModel); 122 122 123 //Same verbosity for all workers, as the 123 //Same verbosity for all workers, as the master 124 fVerboseLevel = theModel->fVerboseLevel; 124 fVerboseLevel = theModel->fVerboseLevel; 125 } 125 } 126 } 126 } 127 127 128 //....oooOO0OOooo........oooOO0OOooo........oo 128 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 129 129 130 G4double G4PenelopeAnnihilationModel::ComputeC 130 G4double G4PenelopeAnnihilationModel::ComputeCrossSectionPerAtom( 131 const G 131 const G4ParticleDefinition*, 132 G 132 G4double energy, 133 G 133 G4double Z, G4double, 134 G 134 G4double, G4double) 135 { 135 { 136 if (fVerboseLevel > 3) 136 if (fVerboseLevel > 3) 137 G4cout << "Calling ComputeCrossSectionPerA 137 G4cout << "Calling ComputeCrossSectionPerAtom() of G4PenelopeAnnihilationModel" << 138 G4endl; 138 G4endl; 139 139 140 G4double cs = Z*ComputeCrossSectionPerElectr 140 G4double cs = Z*ComputeCrossSectionPerElectron(energy); 141 141 142 if (fVerboseLevel > 2) 142 if (fVerboseLevel > 2) 143 G4cout << "Annihilation cross Section at " 143 G4cout << "Annihilation cross Section at " << energy/keV << " keV for Z=" << Z << 144 " = " << cs/barn << " barn" << G4endl; 144 " = " << cs/barn << " barn" << G4endl; 145 return cs; 145 return cs; 146 } 146 } 147 147 148 //....oooOO0OOooo........oooOO0OOooo........oo 148 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 149 149 150 void G4PenelopeAnnihilationModel::SampleSecond 150 void G4PenelopeAnnihilationModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, 151 const G4MaterialCutsCouple*, 151 const G4MaterialCutsCouple*, 152 const G4DynamicParticle* aDyna 152 const G4DynamicParticle* aDynamicPositron, 153 G4double, 153 G4double, 154 G4double) 154 G4double) 155 { 155 { 156 // 156 // 157 // Penelope model to sample final state for 157 // Penelope model to sample final state for positron annihilation. 158 // Target eletrons are assumed to be free an 158 // Target eletrons are assumed to be free and at rest. Binding effects enabling 159 // one-photon annihilation are neglected. 159 // one-photon annihilation are neglected. 160 // For annihilation at rest, two back-to-bac 160 // For annihilation at rest, two back-to-back photons are emitted, having energy of 511 keV 161 // and isotropic angular distribution. 161 // and isotropic angular distribution. 162 // For annihilation in flight, it is used th 162 // For annihilation in flight, it is used the theory from 163 // W. Heitler, The quantum theory of radiat 163 // W. Heitler, The quantum theory of radiation, Oxford University Press (1954) 164 // The two photons can have different energy 164 // The two photons can have different energy. The efficiency of the sampling algorithm 165 // of the photon energy from the dSigma/dE d 165 // of the photon energy from the dSigma/dE distribution is practically 100% for 166 // positrons of kinetic energy < 10 keV. It 166 // positrons of kinetic energy < 10 keV. It reaches a minimum (about 80%) at energy 167 // of about 10 MeV. 167 // of about 10 MeV. 168 // The angle theta is kinematically linked t 168 // The angle theta is kinematically linked to the photon energy, to ensure momentum 169 // conservation. The angle phi is sampled is 169 // conservation. The angle phi is sampled isotropically for the first gamma. 170 // 170 // 171 if (fVerboseLevel > 3) 171 if (fVerboseLevel > 3) 172 G4cout << "Calling SamplingSecondaries() o 172 G4cout << "Calling SamplingSecondaries() of G4PenelopeAnnihilationModel" << G4endl; 173 173 174 G4double kineticEnergy = aDynamicPositron->G 174 G4double kineticEnergy = aDynamicPositron->GetKineticEnergy(); 175 175 176 // kill primary 176 // kill primary 177 fParticleChange->SetProposedKineticEnergy(0. 177 fParticleChange->SetProposedKineticEnergy(0.); 178 fParticleChange->ProposeTrackStatus(fStopAnd 178 fParticleChange->ProposeTrackStatus(fStopAndKill); 179 179 180 if (kineticEnergy == 0.0) 180 if (kineticEnergy == 0.0) 181 { 181 { 182 //Old AtRestDoIt 182 //Old AtRestDoIt 183 G4double cosTheta = -1.0+2.0*G4UniformRa 183 G4double cosTheta = -1.0+2.0*G4UniformRand(); 184 G4double sinTheta = std::sqrt(1.0-cosThe 184 G4double sinTheta = std::sqrt(1.0-cosTheta*cosTheta); 185 G4double phi = twopi*G4UniformRand(); 185 G4double phi = twopi*G4UniformRand(); 186 G4ThreeVector direction (sinTheta*std::c 186 G4ThreeVector direction (sinTheta*std::cos(phi),sinTheta*std::sin(phi),cosTheta); 187 G4DynamicParticle* firstGamma = new G4Dy 187 G4DynamicParticle* firstGamma = new G4DynamicParticle (G4Gamma::Gamma(), 188 direction, electron_mass_c2 188 direction, electron_mass_c2); 189 G4DynamicParticle* secondGamma = new G4D 189 G4DynamicParticle* secondGamma = new G4DynamicParticle (G4Gamma::Gamma(), 190 -direction, electron_mass_ 190 -direction, electron_mass_c2); 191 191 192 fvect->push_back(firstGamma); 192 fvect->push_back(firstGamma); 193 fvect->push_back(secondGamma); 193 fvect->push_back(secondGamma); 194 return; 194 return; 195 } 195 } 196 196 197 //This is the "PostStep" case (annihilation 197 //This is the "PostStep" case (annihilation in flight) 198 G4ParticleMomentum positronDirection = 198 G4ParticleMomentum positronDirection = 199 aDynamicPositron->GetMomentumDirection(); 199 aDynamicPositron->GetMomentumDirection(); 200 G4double gamma = 1.0 + std::max(kineticEnerg 200 G4double gamma = 1.0 + std::max(kineticEnergy,1.0*eV)/electron_mass_c2; 201 G4double gamma21 = std::sqrt(gamma*gamma-1); 201 G4double gamma21 = std::sqrt(gamma*gamma-1); 202 G4double ani = 1.0+gamma; 202 G4double ani = 1.0+gamma; 203 G4double chimin = 1.0/(ani+gamma21); 203 G4double chimin = 1.0/(ani+gamma21); 204 G4double rchi = (1.0-chimin)/chimin; 204 G4double rchi = (1.0-chimin)/chimin; 205 G4double gt0 = ani*ani-2.0; 205 G4double gt0 = ani*ani-2.0; 206 G4double test=0.0; 206 G4double test=0.0; 207 G4double epsilon = 0; 207 G4double epsilon = 0; 208 do{ 208 do{ 209 epsilon = chimin*std::pow(rchi,G4UniformRa 209 epsilon = chimin*std::pow(rchi,G4UniformRand()); 210 G4double reject = ani*ani*(1.0-epsilon)+2. 210 G4double reject = ani*ani*(1.0-epsilon)+2.0*gamma-(1.0/epsilon); 211 test = G4UniformRand()*gt0-reject; 211 test = G4UniformRand()*gt0-reject; 212 }while(test>0); 212 }while(test>0); 213 213 214 G4double totalAvailableEnergy = kineticEnerg 214 G4double totalAvailableEnergy = kineticEnergy + 2.0*electron_mass_c2; 215 G4double photon1Energy = epsilon*totalAvaila 215 G4double photon1Energy = epsilon*totalAvailableEnergy; 216 G4double photon2Energy = (1.0-epsilon)*total 216 G4double photon2Energy = (1.0-epsilon)*totalAvailableEnergy; 217 G4double cosTheta1 = (ani-1.0/epsilon)/gamma 217 G4double cosTheta1 = (ani-1.0/epsilon)/gamma21; 218 G4double cosTheta2 = (ani-1.0/(1.0-epsilon)) 218 G4double cosTheta2 = (ani-1.0/(1.0-epsilon))/gamma21; 219 219 220 G4double sinTheta1 = std::sqrt(1.-cosTheta1* 220 G4double sinTheta1 = std::sqrt(1.-cosTheta1*cosTheta1); 221 G4double phi1 = twopi * G4UniformRand(); 221 G4double phi1 = twopi * G4UniformRand(); 222 G4double dirx1 = sinTheta1 * std::cos(phi1); 222 G4double dirx1 = sinTheta1 * std::cos(phi1); 223 G4double diry1 = sinTheta1 * std::sin(phi1); 223 G4double diry1 = sinTheta1 * std::sin(phi1); 224 G4double dirz1 = cosTheta1; 224 G4double dirz1 = cosTheta1; 225 225 226 G4double sinTheta2 = std::sqrt(1.-cosTheta2* 226 G4double sinTheta2 = std::sqrt(1.-cosTheta2*cosTheta2); 227 G4double phi2 = phi1+pi; 227 G4double phi2 = phi1+pi; 228 G4double dirx2 = sinTheta2 * std::cos(phi2); 228 G4double dirx2 = sinTheta2 * std::cos(phi2); 229 G4double diry2 = sinTheta2 * std::sin(phi2); 229 G4double diry2 = sinTheta2 * std::sin(phi2); 230 G4double dirz2 = cosTheta2; 230 G4double dirz2 = cosTheta2; 231 231 232 G4ThreeVector photon1Direction (dirx1,diry1, 232 G4ThreeVector photon1Direction (dirx1,diry1,dirz1); 233 photon1Direction.rotateUz(positronDirection) 233 photon1Direction.rotateUz(positronDirection); 234 // create G4DynamicParticle object for the p 234 // create G4DynamicParticle object for the particle1 235 G4DynamicParticle* aParticle1= new G4Dynamic 235 G4DynamicParticle* aParticle1= new G4DynamicParticle (G4Gamma::Gamma(), 236 photon1Direction, 236 photon1Direction, 237 photon1Energy); 237 photon1Energy); 238 fvect->push_back(aParticle1); 238 fvect->push_back(aParticle1); 239 239 240 G4ThreeVector photon2Direction(dirx2,diry2,d 240 G4ThreeVector photon2Direction(dirx2,diry2,dirz2); 241 photon2Direction.rotateUz(positronDirection) 241 photon2Direction.rotateUz(positronDirection); 242 // create G4DynamicParticle object for the p 242 // create G4DynamicParticle object for the particle2 243 G4DynamicParticle* aParticle2= new G4Dynamic 243 G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(), 244 photon2Direction, 244 photon2Direction, 245 photon2Energy); 245 photon2Energy); 246 fvect->push_back(aParticle2); 246 fvect->push_back(aParticle2); 247 247 248 if (fVerboseLevel > 1) 248 if (fVerboseLevel > 1) 249 { 249 { 250 G4cout << "----------------------------- 250 G4cout << "-----------------------------------------------------------" << G4endl; 251 G4cout << "Energy balance from G4Penelop 251 G4cout << "Energy balance from G4PenelopeAnnihilation" << G4endl; 252 G4cout << "Kinetic positron energy: " << 252 G4cout << "Kinetic positron energy: " << kineticEnergy/keV << " keV" << G4endl; 253 G4cout << "Total available energy: " << 253 G4cout << "Total available energy: " << totalAvailableEnergy/keV << " keV " << G4endl; 254 G4cout << "----------------------------- 254 G4cout << "-----------------------------------------------------------" << G4endl; 255 G4cout << "Photon energy 1: " << photon1 255 G4cout << "Photon energy 1: " << photon1Energy/keV << " keV" << G4endl; 256 G4cout << "Photon energy 2: " << photon2 256 G4cout << "Photon energy 2: " << photon2Energy/keV << " keV" << G4endl; 257 G4cout << "Total final state: " << (phot 257 G4cout << "Total final state: " << (photon1Energy+photon2Energy)/keV << 258 " keV" << G4endl; 258 " keV" << G4endl; 259 G4cout << "----------------------------- 259 G4cout << "-----------------------------------------------------------" << G4endl; 260 } 260 } 261 if (fVerboseLevel > 0) 261 if (fVerboseLevel > 0) 262 { 262 { 263 G4double energyDiff = std::fabs(totalAva 263 G4double energyDiff = std::fabs(totalAvailableEnergy-photon1Energy-photon2Energy); 264 if (energyDiff > 0.05*keV) 264 if (energyDiff > 0.05*keV) 265 G4cout << "Warning from G4PenelopeAnnihilati 265 G4cout << "Warning from G4PenelopeAnnihilation: problem with energy conservation: " << 266 (photon1Energy+photon2Energy)/keV << 266 (photon1Energy+photon2Energy)/keV << 267 " keV (final) vs. " << 267 " keV (final) vs. " << 268 totalAvailableEnergy/keV << " keV (initial 268 totalAvailableEnergy/keV << " keV (initial)" << G4endl; 269 } 269 } 270 return; 270 return; 271 } 271 } 272 272 273 //....oooOO0OOooo........oooOO0OOooo........oo 273 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 274 274 275 G4double G4PenelopeAnnihilationModel:: Compute 275 G4double G4PenelopeAnnihilationModel:: ComputeCrossSectionPerElectron(G4double energy) 276 { 276 { 277 // 277 // 278 // Penelope model to calculate cross section 278 // Penelope model to calculate cross section for positron annihilation. 279 // The annihilation cross section per electr 279 // The annihilation cross section per electron is calculated according 280 // to the Heitler formula 280 // to the Heitler formula 281 // W. Heitler, The quantum theory of radiat 281 // W. Heitler, The quantum theory of radiation, Oxford University Press (1954) 282 // in the assumptions of electrons free and 282 // in the assumptions of electrons free and at rest. 283 // 283 // 284 G4double gamma = 1.0+std::max(energy,1.0*eV) 284 G4double gamma = 1.0+std::max(energy,1.0*eV)/electron_mass_c2; 285 G4double gamma2 = gamma*gamma; 285 G4double gamma2 = gamma*gamma; 286 G4double f2 = gamma2-1.0; 286 G4double f2 = gamma2-1.0; 287 G4double f1 = std::sqrt(f2); 287 G4double f1 = std::sqrt(f2); 288 G4double crossSection = fPielr2*((gamma2+4.0 288 G4double crossSection = fPielr2*((gamma2+4.0*gamma+1.0)*G4Log(gamma+f1)/f2 289 - (gamma+3.0)/f1)/(gamma+1.0); 289 - (gamma+3.0)/f1)/(gamma+1.0); 290 return crossSection; 290 return crossSection; 291 } 291 } 292 292 293 //....oooOO0OOooo........oooOO0OOooo........oo 293 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo... 294 294 295 void G4PenelopeAnnihilationModel::SetParticle( 295 void G4PenelopeAnnihilationModel::SetParticle(const G4ParticleDefinition* p) 296 { 296 { 297 if(!fParticle) { 297 if(!fParticle) { 298 fParticle = p; 298 fParticle = p; 299 } 299 } 300 } 300 } 301 301