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27 // 27 //
28 // Geant4 Class file 28 // Geant4 Class file
29 // 29 //
30 // File name: G4PolarizedAnnihilation 30 // File name: G4PolarizedAnnihilation
31 // 31 //
32 // Author: A. Schaelicke on base of Vladimir 32 // Author: A. Schaelicke on base of Vladimir Ivanchenko / Michel Maire code
33 // 33 //
34 // Class Description: 34 // Class Description:
35 // Polarized process of e+ annihilation into 35 // Polarized process of e+ annihilation into 2 gammas
36 36
37 #include "G4PolarizedAnnihilation.hh" 37 #include "G4PolarizedAnnihilation.hh"
38 38
39 #include "G4DynamicParticle.hh" 39 #include "G4DynamicParticle.hh"
40 #include "G4MaterialCutsCouple.hh" 40 #include "G4MaterialCutsCouple.hh"
41 #include "G4PhysicsTableHelper.hh" 41 #include "G4PhysicsTableHelper.hh"
42 #include "G4PhysicsVector.hh" 42 #include "G4PhysicsVector.hh"
43 #include "G4PolarizationHelper.hh" 43 #include "G4PolarizationHelper.hh"
44 #include "G4PolarizationManager.hh" 44 #include "G4PolarizationManager.hh"
45 #include "G4PolarizedAnnihilationModel.hh" 45 #include "G4PolarizedAnnihilationModel.hh"
46 #include "G4ProductionCutsTable.hh" 46 #include "G4ProductionCutsTable.hh"
47 #include "G4SystemOfUnits.hh" 47 #include "G4SystemOfUnits.hh"
48 #include "G4StokesVector.hh" 48 #include "G4StokesVector.hh"
49 49
50 //....oooOO0OOooo........oooOO0OOooo........oo 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
51 G4PolarizedAnnihilation::G4PolarizedAnnihilati 51 G4PolarizedAnnihilation::G4PolarizedAnnihilation(const G4String& name)
52 : G4eplusAnnihilation(name) 52 : G4eplusAnnihilation(name)
53 , fAsymmetryTable(nullptr) 53 , fAsymmetryTable(nullptr)
54 , fTransverseAsymmetryTable(nullptr) 54 , fTransverseAsymmetryTable(nullptr)
55 { 55 {
56 fEmModel = new G4PolarizedAnnihilationModel( 56 fEmModel = new G4PolarizedAnnihilationModel();
57 SetEmModel(fEmModel); 57 SetEmModel(fEmModel);
58 } 58 }
59 59
60 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
61 G4PolarizedAnnihilation::~G4PolarizedAnnihilat 61 G4PolarizedAnnihilation::~G4PolarizedAnnihilation() { CleanTables(); }
62 62
63 //....oooOO0OOooo........oooOO0OOooo........oo 63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64 void G4PolarizedAnnihilation::CleanTables() 64 void G4PolarizedAnnihilation::CleanTables()
65 { 65 {
66 if(fAsymmetryTable) 66 if(fAsymmetryTable)
67 { 67 {
68 fAsymmetryTable->clearAndDestroy(); 68 fAsymmetryTable->clearAndDestroy();
69 delete fAsymmetryTable; 69 delete fAsymmetryTable;
70 fAsymmetryTable = nullptr; 70 fAsymmetryTable = nullptr;
71 } 71 }
72 if(fTransverseAsymmetryTable) 72 if(fTransverseAsymmetryTable)
73 { 73 {
74 fTransverseAsymmetryTable->clearAndDestroy 74 fTransverseAsymmetryTable->clearAndDestroy();
75 delete fTransverseAsymmetryTable; 75 delete fTransverseAsymmetryTable;
76 fTransverseAsymmetryTable = nullptr; 76 fTransverseAsymmetryTable = nullptr;
77 } 77 }
78 } 78 }
79 79
80 //....oooOO0OOooo........oooOO0OOooo........oo 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
81 G4double G4PolarizedAnnihilation::GetMeanFreeP 81 G4double G4PolarizedAnnihilation::GetMeanFreePath(const G4Track& track,
82 82 G4double previousStepSize,
83 83 G4ForceCondition* condition)
84 { 84 {
85 G4double mfp = 85 G4double mfp =
86 G4VEmProcess::GetMeanFreePath(track, previ 86 G4VEmProcess::GetMeanFreePath(track, previousStepSize, condition);
87 87
88 if(nullptr != fAsymmetryTable && nullptr != 88 if(nullptr != fAsymmetryTable && nullptr != fTransverseAsymmetryTable && mfp < DBL_MAX)
89 { 89 {
90 mfp *= ComputeSaturationFactor(track); 90 mfp *= ComputeSaturationFactor(track);
91 } 91 }
92 if(verboseLevel >= 2) 92 if(verboseLevel >= 2)
93 { 93 {
94 G4cout << "G4PolarizedAnnihilation::MeanFr 94 G4cout << "G4PolarizedAnnihilation::MeanFreePath: " << mfp / mm << " mm "
95 << G4endl; 95 << G4endl;
96 } 96 }
97 return mfp; 97 return mfp;
98 } 98 }
99 99
100 //....oooOO0OOooo........oooOO0OOooo........oo 100 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
101 G4double G4PolarizedAnnihilation::PostStepGetP 101 G4double G4PolarizedAnnihilation::PostStepGetPhysicalInteractionLength(
102 const G4Track& track, G4double previousStepS 102 const G4Track& track, G4double previousStepSize, G4ForceCondition* condition)
103 { 103 {
104 // save previous values 104 // save previous values
105 G4double nLength = theNumberOfInteractionLen 105 G4double nLength = theNumberOfInteractionLengthLeft;
106 G4double iLength = currentInteractionLength; 106 G4double iLength = currentInteractionLength;
107 107
108 // *** compute unpolarized step limit *** 108 // *** compute unpolarized step limit ***
109 // this changes theNumberOfInteractionLength 109 // this changes theNumberOfInteractionLengthLeft and currentInteractionLength
110 G4double x = G4VEmProcess::PostStepGetPhysic 110 G4double x = G4VEmProcess::PostStepGetPhysicalInteractionLength(
111 track, previousStepSize, condition); 111 track, previousStepSize, condition);
112 G4double x0 = x; 112 G4double x0 = x;
113 G4double satFact = 1.0; 113 G4double satFact = 1.0;
114 114
115 // *** add corrections on polarisation *** 115 // *** add corrections on polarisation ***
116 if(nullptr != fAsymmetryTable && nullptr != 116 if(nullptr != fAsymmetryTable && nullptr != fTransverseAsymmetryTable && x < DBL_MAX)
117 { 117 {
118 satFact = ComputeSaturationFact 118 satFact = ComputeSaturationFactor(track);
119 G4double curLength = currentInteractionLen 119 G4double curLength = currentInteractionLength * satFact;
120 G4double prvLength = iLength * satFact; 120 G4double prvLength = iLength * satFact;
121 if(nLength > 0.0) 121 if(nLength > 0.0)
122 { 122 {
123 theNumberOfInteractionLengthLeft = 123 theNumberOfInteractionLengthLeft =
124 std::max(nLength - previousStepSize / 124 std::max(nLength - previousStepSize / prvLength, 0.0);
125 } 125 }
126 x = theNumberOfInteractionLengthLeft * cur 126 x = theNumberOfInteractionLengthLeft * curLength;
127 } 127 }
128 if(verboseLevel >= 2) 128 if(verboseLevel >= 2)
129 { 129 {
130 G4cout << "G4PolarizedAnnihilation::PostSt 130 G4cout << "G4PolarizedAnnihilation::PostStepGPIL: " << std::setprecision(8)
131 << x / mm << " mm;" << G4endl 131 << x / mm << " mm;" << G4endl
132 << " unpola 132 << " unpolarized value: "
133 << std::setprecision(8) << x0 / mm 133 << std::setprecision(8) << x0 / mm << " mm." << G4endl;
134 } 134 }
135 return x; 135 return x;
136 } 136 }
137 137
138 //....oooOO0OOooo........oooOO0OOooo........oo 138 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
139 G4double G4PolarizedAnnihilation::ComputeSatur 139 G4double G4PolarizedAnnihilation::ComputeSaturationFactor(const G4Track& track)
140 { 140 {
141 const G4Material* aMaterial = track.GetMater << 141 G4Material* aMaterial = track.GetMaterial();
142 G4VPhysicalVolume* aPVolume = track.GetVolum 142 G4VPhysicalVolume* aPVolume = track.GetVolume();
143 G4LogicalVolume* aLVolume = aPVolume->GetL 143 G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume();
144 144
145 G4PolarizationManager* polarizationManager = 145 G4PolarizationManager* polarizationManager =
146 G4PolarizationManager::GetInstance(); 146 G4PolarizationManager::GetInstance();
147 147
148 const G4bool volumeIsPolarized = polarizatio 148 const G4bool volumeIsPolarized = polarizationManager->IsPolarized(aLVolume);
149 G4StokesVector electronPolarization = 149 G4StokesVector electronPolarization =
150 polarizationManager->GetVolumePolarization 150 polarizationManager->GetVolumePolarization(aLVolume);
151 151
152 G4double factor = 1.0; 152 G4double factor = 1.0;
153 153
154 if(volumeIsPolarized) 154 if(volumeIsPolarized)
155 { 155 {
156 // *** get asymmetry, if target is polariz 156 // *** get asymmetry, if target is polarized ***
157 const G4DynamicParticle* aDynamicPositron 157 const G4DynamicParticle* aDynamicPositron = track.GetDynamicParticle();
158 const G4double positronEnergy = aDynamicPo 158 const G4double positronEnergy = aDynamicPositron->GetKineticEnergy();
159 const G4StokesVector positronPolarization 159 const G4StokesVector positronPolarization =
160 G4StokesVector(track.GetPolarization()); 160 G4StokesVector(track.GetPolarization());
161 const G4ParticleMomentum positronDirection 161 const G4ParticleMomentum positronDirection0 =
162 aDynamicPositron->GetMomentumDirection() 162 aDynamicPositron->GetMomentumDirection();
163 163
164 if(verboseLevel >= 2) 164 if(verboseLevel >= 2)
165 { 165 {
166 G4cout << "G4PolarizedAnnihilation::Comp 166 G4cout << "G4PolarizedAnnihilation::ComputeSaturationFactor: " << G4endl;
167 G4cout << " Mom " << positronDirection0 167 G4cout << " Mom " << positronDirection0 << G4endl;
168 G4cout << " Polarization " << positronPo 168 G4cout << " Polarization " << positronPolarization << G4endl;
169 G4cout << " MaterialPol. " << electronPo 169 G4cout << " MaterialPol. " << electronPolarization << G4endl;
170 G4cout << " Phys. Volume " << aPVolume-> 170 G4cout << " Phys. Volume " << aPVolume->GetName() << G4endl;
171 G4cout << " Log. Volume " << aLVolume-> 171 G4cout << " Log. Volume " << aLVolume->GetName() << G4endl;
172 G4cout << " Material " << aMaterial 172 G4cout << " Material " << aMaterial << G4endl;
173 } 173 }
174 174
175 std::size_t midx = CurrentMa << 175 size_t midx = CurrentMaterialCutsCoupleIndex();
176 const G4PhysicsVector* aVector = nullptr; 176 const G4PhysicsVector* aVector = nullptr;
177 const G4PhysicsVector* bVector = nullptr; 177 const G4PhysicsVector* bVector = nullptr;
178 if(midx < fAsymmetryTable->size()) 178 if(midx < fAsymmetryTable->size())
179 { 179 {
180 aVector = (*fAsymmetryTable)(midx); 180 aVector = (*fAsymmetryTable)(midx);
181 } 181 }
182 if(midx < fTransverseAsymmetryTable->size( 182 if(midx < fTransverseAsymmetryTable->size())
183 { 183 {
184 bVector = (*fTransverseAsymmetryTable)(m 184 bVector = (*fTransverseAsymmetryTable)(midx);
185 } 185 }
186 if(aVector && bVector) 186 if(aVector && bVector)
187 { 187 {
188 G4double lAsymmetry = aVector->Value(pos 188 G4double lAsymmetry = aVector->Value(positronEnergy);
189 G4double tAsymmetry = bVector->Value(pos 189 G4double tAsymmetry = bVector->Value(positronEnergy);
190 G4double polZZ = 190 G4double polZZ =
191 positronPolarization.z() * (electronPo 191 positronPolarization.z() * (electronPolarization * positronDirection0);
192 G4double polXX = 192 G4double polXX =
193 positronPolarization.x() * 193 positronPolarization.x() *
194 (electronPolarization * 194 (electronPolarization *
195 G4PolarizationHelper::GetParticleFram 195 G4PolarizationHelper::GetParticleFrameX(positronDirection0));
196 G4double polYY = 196 G4double polYY =
197 positronPolarization.y() * 197 positronPolarization.y() *
198 (electronPolarization * 198 (electronPolarization *
199 G4PolarizationHelper::GetParticleFram 199 G4PolarizationHelper::GetParticleFrameY(positronDirection0));
200 200
201 factor /= (1. + polZZ * lAsymmetry + (po 201 factor /= (1. + polZZ * lAsymmetry + (polXX + polYY) * tAsymmetry);
202 202
203 if(verboseLevel >= 2) 203 if(verboseLevel >= 2)
204 { 204 {
205 G4cout << " Asymmetry: " << lAsymm 205 G4cout << " Asymmetry: " << lAsymmetry << ", " << tAsymmetry
206 << G4endl; 206 << G4endl;
207 G4cout << " PolProduct: " << polXX 207 G4cout << " PolProduct: " << polXX << ", " << polYY << ", " << polZZ
208 << G4endl; 208 << G4endl;
209 G4cout << " Factor: " << factor 209 G4cout << " Factor: " << factor << G4endl;
210 } 210 }
211 } 211 }
212 else 212 else
213 { 213 {
214 G4ExceptionDescription ed; 214 G4ExceptionDescription ed;
215 ed << "Problem with asymmetry tables: ma 215 ed << "Problem with asymmetry tables: material index " << midx
216 << " is out of range or tables are no 216 << " is out of range or tables are not filled";
217 G4Exception("G4PolarizedAnnihilation::Co 217 G4Exception("G4PolarizedAnnihilation::ComputeSaturationFactor", "em0048",
218 JustWarning, ed, ""); 218 JustWarning, ed, "");
219 } 219 }
220 } 220 }
221 return factor; 221 return factor;
222 } 222 }
223 223
224 //....oooOO0OOooo........oooOO0OOooo........oo 224 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
225 void G4PolarizedAnnihilation::BuildPhysicsTabl 225 void G4PolarizedAnnihilation::BuildPhysicsTable(
226 const G4ParticleDefinition& part) 226 const G4ParticleDefinition& part)
227 { 227 {
228 G4VEmProcess::BuildPhysicsTable(part); 228 G4VEmProcess::BuildPhysicsTable(part);
229 if(isTheMaster) 229 if(isTheMaster)
230 { 230 {
231 BuildAsymmetryTables(part); 231 BuildAsymmetryTables(part);
232 } 232 }
233 } 233 }
234 234
235 //....oooOO0OOooo........oooOO0OOooo........oo 235 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
236 void G4PolarizedAnnihilation::BuildAsymmetryTa 236 void G4PolarizedAnnihilation::BuildAsymmetryTables(
237 const G4ParticleDefinition& part) 237 const G4ParticleDefinition& part)
238 { 238 {
239 // cleanup old, initialise new table 239 // cleanup old, initialise new table
240 CleanTables(); 240 CleanTables();
241 fAsymmetryTable = G4PhysicsTableHelper::Prep 241 fAsymmetryTable = G4PhysicsTableHelper::PreparePhysicsTable(fAsymmetryTable);
242 fTransverseAsymmetryTable = 242 fTransverseAsymmetryTable =
243 G4PhysicsTableHelper::PreparePhysicsTable( 243 G4PhysicsTableHelper::PreparePhysicsTable(fTransverseAsymmetryTable);
244 if(nullptr == fAsymmetryTable) return; 244 if(nullptr == fAsymmetryTable) return;
245 245
246 // Access to materials 246 // Access to materials
247 const G4ProductionCutsTable* theCoupleTable 247 const G4ProductionCutsTable* theCoupleTable =
248 G4ProductionCutsTable::GetProductionCutsTa 248 G4ProductionCutsTable::GetProductionCutsTable();
249 G4int numOfCouples = (G4int)theCoupleTable-> << 249 size_t numOfCouples = theCoupleTable->GetTableSize();
250 for(G4int i = 0; i < numOfCouples; ++i) << 250 for(size_t i = 0; i < numOfCouples; ++i)
251 { 251 {
252 if(fAsymmetryTable->GetFlag(i)) 252 if(fAsymmetryTable->GetFlag(i))
253 { 253 {
254 // create physics vector and fill it 254 // create physics vector and fill it
255 const G4MaterialCutsCouple* couple = 255 const G4MaterialCutsCouple* couple =
256 theCoupleTable->GetMaterialCutsCouple( 256 theCoupleTable->GetMaterialCutsCouple(i);
257 257
258 // use same parameters as for lambda 258 // use same parameters as for lambda
259 G4PhysicsVector* aVector = LambdaPhysics 259 G4PhysicsVector* aVector = LambdaPhysicsVector(couple);
260 G4PhysicsVector* tVector = LambdaPhysics 260 G4PhysicsVector* tVector = LambdaPhysicsVector(couple);
261 G4int nn = (G4int)aVector->GetVectorLeng << 261 G4int nn = aVector->GetVectorLength();
262 for(G4int j = 0; j < nn; ++j) 262 for(G4int j = 0; j < nn; ++j)
263 { 263 {
264 G4double energy = aVector->Energy(j); 264 G4double energy = aVector->Energy(j);
265 G4double tasm = 0.; 265 G4double tasm = 0.;
266 G4double asym = ComputeAsymmetry(energ 266 G4double asym = ComputeAsymmetry(energy, couple, part, 0., tasm);
267 aVector->PutValue(j, asym); 267 aVector->PutValue(j, asym);
268 tVector->PutValue(j, tasm); 268 tVector->PutValue(j, tasm);
269 } 269 }
270 if(aVector->GetSpline()) { 270 if(aVector->GetSpline()) {
271 aVector->FillSecondDerivatives(); 271 aVector->FillSecondDerivatives();
272 tVector->FillSecondDerivatives(); 272 tVector->FillSecondDerivatives();
273 } 273 }
274 G4PhysicsTableHelper::SetPhysicsVector(f 274 G4PhysicsTableHelper::SetPhysicsVector(fAsymmetryTable, i, aVector);
275 G4PhysicsTableHelper::SetPhysicsVector(f 275 G4PhysicsTableHelper::SetPhysicsVector(fTransverseAsymmetryTable, i,
276 t 276 tVector);
277 } 277 }
278 } 278 }
279 } 279 }
280 280
281 //....oooOO0OOooo........oooOO0OOooo........oo 281 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
282 G4double G4PolarizedAnnihilation::ComputeAsymm 282 G4double G4PolarizedAnnihilation::ComputeAsymmetry(
283 G4double energy, const G4MaterialCutsCouple* 283 G4double energy, const G4MaterialCutsCouple* couple,
284 const G4ParticleDefinition& aParticle, G4dou 284 const G4ParticleDefinition& aParticle, G4double cut, G4double& tAsymmetry)
285 { 285 {
286 G4double lAsymmetry = 0.0; 286 G4double lAsymmetry = 0.0;
287 tAsymmetry = 0.0; 287 tAsymmetry = 0.0;
288 288
289 // calculate polarized cross section 289 // calculate polarized cross section
290 G4ThreeVector targetPolarization = G4ThreeVe 290 G4ThreeVector targetPolarization = G4ThreeVector(0., 0., 1.);
291 fEmModel->SetTargetPolarization(targetPolari 291 fEmModel->SetTargetPolarization(targetPolarization);
292 fEmModel->SetBeamPolarization(targetPolariza 292 fEmModel->SetBeamPolarization(targetPolarization);
293 G4double sigma2 = 293 G4double sigma2 =
294 fEmModel->CrossSection(couple, &aParticle, 294 fEmModel->CrossSection(couple, &aParticle, energy, cut, energy);
295 295
296 // calculate transversely polarized cross se 296 // calculate transversely polarized cross section
297 targetPolarization = G4ThreeVector(1., 0., 0 297 targetPolarization = G4ThreeVector(1., 0., 0.);
298 fEmModel->SetTargetPolarization(targetPolari 298 fEmModel->SetTargetPolarization(targetPolarization);
299 fEmModel->SetBeamPolarization(targetPolariza 299 fEmModel->SetBeamPolarization(targetPolarization);
300 G4double sigma3 = 300 G4double sigma3 =
301 fEmModel->CrossSection(couple, &aParticle, 301 fEmModel->CrossSection(couple, &aParticle, energy, cut, energy);
302 302
303 // calculate unpolarized cross section 303 // calculate unpolarized cross section
304 targetPolarization = G4ThreeVector(); 304 targetPolarization = G4ThreeVector();
305 fEmModel->SetTargetPolarization(targetPolari 305 fEmModel->SetTargetPolarization(targetPolarization);
306 fEmModel->SetBeamPolarization(targetPolariza 306 fEmModel->SetBeamPolarization(targetPolarization);
307 G4double sigma0 = 307 G4double sigma0 =
308 fEmModel->CrossSection(couple, &aParticle, 308 fEmModel->CrossSection(couple, &aParticle, energy, cut, energy);
309 309
310 // determine asymmetries 310 // determine asymmetries
311 if(sigma0 > 0.) 311 if(sigma0 > 0.)
312 { 312 {
313 lAsymmetry = sigma2 / sigma0 - 1.; 313 lAsymmetry = sigma2 / sigma0 - 1.;
314 tAsymmetry = sigma3 / sigma0 - 1.; 314 tAsymmetry = sigma3 / sigma0 - 1.;
315 } 315 }
316 return lAsymmetry; 316 return lAsymmetry;
317 } 317 }
318 318
319 //....oooOO0OOooo........oooOO0OOooo........oo 319 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
320 void G4PolarizedAnnihilation::ProcessDescripti 320 void G4PolarizedAnnihilation::ProcessDescription(std::ostream& out) const
321 { 321 {
322 out << "Polarized model for positron annihil 322 out << "Polarized model for positron annihilation into 2 photons.\n";
323 } 323 }
324 324