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26 // << 26 // $Id: G4LivermorePolarizedComptonModel.cc,v 1.6 2009-05-03 08:29:55 sincerti Exp $
27 // Authors: G.Depaola & F.Longo << 27 // GEANT4 tag $Name: geant4-09-04-patch-02 $
28 // 28 //
29 // History: 29 // History:
30 // ------- << 30 // --------
31 // <<
32 // 05 Apr 2021 J Allison added quantum entan <<
33 // If the photons have been "tagged" as "quant <<
34 // G4eplusAnnihilation for annihilation into 2 <<
35 // here if - and only if - both photons suffer <<
36 // predictions from Pryce and Ward, Nature No <<
37 // Physical Review 73 (1948) p.440. Experiment <<
38 // entanglement in the MeV regime and its appl <<
39 // D. Watts, J. Allison et al., Nature Communi <<
40 // https://doi.org/10.1038/s41467-021-22907-5. <<
41 // <<
42 // 02 May 2009 S Incerti as V. Ivanchenko pr 31 // 02 May 2009 S Incerti as V. Ivanchenko proposed in G4LivermoreComptonModel.cc
43 // 32 //
44 // Cleanup initialisation and generation of se 33 // Cleanup initialisation and generation of secondaries:
45 // - apply internal high-ener 34 // - apply internal high-energy limit only in constructor
46 // - do not apply low-energy 35 // - do not apply low-energy limit (default is 0)
47 // - remove GetMeanFreePath m 36 // - remove GetMeanFreePath method and table
48 // - added protection against 37 // - added protection against numerical problem in energy sampling
49 // - use G4ElementSelector 38 // - use G4ElementSelector
50 39
51 #include "G4LivermorePolarizedComptonModel.hh" 40 #include "G4LivermorePolarizedComptonModel.hh"
52 #include "G4PhysicalConstants.hh" <<
53 #include "G4SystemOfUnits.hh" <<
54 #include "G4AutoLock.hh" <<
55 #include "G4Electron.hh" <<
56 #include "G4ParticleChangeForGamma.hh" <<
57 #include "G4LossTableManager.hh" <<
58 #include "G4VAtomDeexcitation.hh" <<
59 #include "G4AtomicShell.hh" <<
60 #include "G4Gamma.hh" <<
61 #include "G4ShellData.hh" <<
62 #include "G4DopplerProfile.hh" <<
63 #include "G4Log.hh" <<
64 #include "G4Exp.hh" <<
65 #include "G4Pow.hh" <<
66 #include "G4LogLogInterpolation.hh" <<
67 #include "G4PhysicsModelCatalog.hh" <<
68 #include "G4EntanglementAuxInfo.hh" <<
69 #include "G4eplusAnnihilationEntanglementClipB <<
70 41
71 //....oooOO0OOooo........oooOO0OOooo........oo 42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
72 43
73 using namespace std; 44 using namespace std;
74 namespace { G4Mutex LivermorePolarizedComptonM <<
75 <<
76 <<
77 G4PhysicsFreeVector* G4LivermorePolarizedCompt <<
78 G4ShellData* G4LivermorePolarizedCompton <<
79 G4DopplerProfile* G4LivermorePolarizedCompton <<
80 G4CompositeEMDataSet* G4LivermorePolarizedComp <<
81 45
82 //....oooOO0OOooo........oooOO0OOooo........oo 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 47
84 G4LivermorePolarizedComptonModel::G4LivermoreP << 48 G4LivermorePolarizedComptonModel::G4LivermorePolarizedComptonModel(const G4ParticleDefinition*,
85 :G4VEmModel(nam),isInitialised(false) << 49 const G4String& nam)
86 { << 50 :G4VEmModel(nam),isInitialised(false),meanFreePathTable(0),scatterFunctionData(0),crossSectionHandler(0)
87 verboseLevel= 1; << 51 {
>> 52 lowEnergyLimit = 250 * eV;
>> 53 highEnergyLimit = 100 * GeV;
>> 54 //SetLowEnergyLimit(lowEnergyLimit);
>> 55 SetHighEnergyLimit(highEnergyLimit);
>> 56
>> 57 verboseLevel= 0;
88 // Verbosity scale: 58 // Verbosity scale:
89 // 0 = nothing 59 // 0 = nothing
90 // 1 = warning for energy non-conservation 60 // 1 = warning for energy non-conservation
91 // 2 = details of energy budget 61 // 2 = details of energy budget
92 // 3 = calculation of cross sections, file o 62 // 3 = calculation of cross sections, file openings, sampling of atoms
93 // 4 = entering in methods 63 // 4 = entering in methods
94 64
95 if( verboseLevel>1 ) << 65 if( verboseLevel>0 ) {
96 G4cout << "Livermore Polarized Compton is << 66 G4cout << "Livermore Polarized Compton is constructed " << G4endl
97 << 67 << "Energy range: "
98 //Mark this model as "applicable" for atomic << 68 << lowEnergyLimit / eV << " eV - "
99 SetDeexcitationFlag(true); << 69 << highEnergyLimit / GeV << " GeV"
100 << 70 << G4endl;
101 fParticleChange = nullptr; << 71 }
102 fAtomDeexcitation = nullptr; <<
103 fEntanglementModelID = G4PhysicsModelCatalog <<
104 } 72 }
105 73
106 //....oooOO0OOooo........oooOO0OOooo........oo 74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
107 75
108 G4LivermorePolarizedComptonModel::~G4Livermore 76 G4LivermorePolarizedComptonModel::~G4LivermorePolarizedComptonModel()
109 { 77 {
110 if(IsMaster()) { << 78 if (meanFreePathTable) delete meanFreePathTable;
111 delete shellData; << 79 if (crossSectionHandler) delete crossSectionHandler;
112 shellData = nullptr; << 80 if (scatterFunctionData) delete scatterFunctionData;
113 delete profileData; <<
114 profileData = nullptr; <<
115 delete scatterFunctionData; <<
116 scatterFunctionData = nullptr; <<
117 for(G4int i=0; i<maxZ; ++i) { <<
118 if(data[i]) { <<
119 delete data[i]; <<
120 data[i] = nullptr; <<
121 } <<
122 } <<
123 } <<
124 } 81 }
125 82
126 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
127 84
128 void G4LivermorePolarizedComptonModel::Initial 85 void G4LivermorePolarizedComptonModel::Initialise(const G4ParticleDefinition* particle,
129 const G 86 const G4DataVector& cuts)
130 { 87 {
131 if (verboseLevel > 1) << 88 if (verboseLevel > 3)
132 G4cout << "Calling G4LivermorePolarizedCom 89 G4cout << "Calling G4LivermorePolarizedComptonModel::Initialise()" << G4endl;
133 90
134 // Initialise element selector << 91 if (crossSectionHandler)
135 if(IsMaster()) { << 92 {
136 // Access to elements << 93 crossSectionHandler->Clear();
137 const char* path = G4FindDataDir("G4LEDATA << 94 delete crossSectionHandler;
138 <<
139 G4ProductionCutsTable* theCoupleTable = <<
140 G4ProductionCutsTable::GetProductionCuts <<
141 <<
142 G4int numOfCouples = (G4int)theCoupleTable <<
143 <<
144 for(G4int i=0; i<numOfCouples; ++i) { <<
145 const G4Material* material = <<
146 theCoupleTable->GetMaterialCutsCouple( <<
147 const G4ElementVector* theElementVector <<
148 std::size_t nelm = material->GetNumberOf <<
149 <<
150 for (std::size_t j=0; j<nelm; ++j) { <<
151 G4int Z = G4lrint((*theElementVector)[ <<
152 if(Z < 1) { Z = 1; } <<
153 else if(Z > maxZ){ Z = maxZ; } <<
154 <<
155 if( (!data[Z]) ) { ReadData(Z, path); <<
156 } <<
157 } <<
158 <<
159 // For Doppler broadening <<
160 if(!shellData) { <<
161 shellData = new G4ShellData(); <<
162 shellData->SetOccupancyData(); <<
163 G4String file = "/doppler/shell-doppler" <<
164 shellData->LoadData(file); <<
165 } <<
166 if(!profileData) { profileData = new G4Dop <<
167 <<
168 // Scattering Function <<
169 if(!scatterFunctionData) <<
170 { <<
171 <<
172 G4VDataSetAlgorithm* scatterInterpolation = <<
173 G4String scatterFile = "comp/ce-sf-"; <<
174 scatterFunctionData = new G4CompositeEMDataS <<
175 scatterFunctionData->LoadData(scatterFile); <<
176 } <<
177 <<
178 InitialiseElementSelectors(particle, cuts) <<
179 } <<
180 <<
181 if (verboseLevel > 2) { <<
182 G4cout << "Loaded cross section files" << <<
183 } 95 }
>> 96
>> 97 // Reading of data files - all materials are read
184 98
185 if( verboseLevel>1 ) { << 99 crossSectionHandler = new G4CrossSectionHandler;
186 G4cout << "G4LivermoreComptonModel is init << 100 crossSectionHandler->Clear();
187 << "Energy range: " << 101 G4String crossSectionFile = "comp/ce-cs-";
188 << LowEnergyLimit() / eV << " eV - " << 102 crossSectionHandler->LoadData(crossSectionFile);
189 << HighEnergyLimit() / GeV << " GeV" << 103
190 << G4endl; << 104 meanFreePathTable = 0;
>> 105 meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials();
>> 106
>> 107 G4VDataSetAlgorithm* scatterInterpolation = new G4LogLogInterpolation;
>> 108 G4String scatterFile = "comp/ce-sf-";
>> 109 scatterFunctionData = new G4CompositeEMDataSet(scatterInterpolation, 1., 1.);
>> 110 scatterFunctionData->LoadData(scatterFile);
>> 111
>> 112 // For Doppler broadening
>> 113 shellData.SetOccupancyData();
>> 114 G4String file = "/doppler/shell-doppler";
>> 115 shellData.LoadData(file);
>> 116
>> 117 if (verboseLevel > 2)
>> 118 G4cout << "Loaded cross section files for Livermore Polarized Compton model" << G4endl;
>> 119
>> 120 InitialiseElementSelectors(particle,cuts);
>> 121
>> 122 if( verboseLevel>0 ) {
>> 123 G4cout << "Livermore Polarized Compton model is initialized " << G4endl
>> 124 << "Energy range: "
>> 125 << LowEnergyLimit() / eV << " eV - "
>> 126 << HighEnergyLimit() / GeV << " GeV"
>> 127 << G4endl;
191 } 128 }
192 // <<
193 if(isInitialised) { return; } <<
194 129
>> 130 //
>> 131
>> 132 if(isInitialised) return;
195 fParticleChange = GetParticleChangeForGamma( 133 fParticleChange = GetParticleChangeForGamma();
196 fAtomDeexcitation = G4LossTableManager::Ins <<
197 isInitialised = true; 134 isInitialised = true;
198 } 135 }
199 136
200 <<
201 void G4LivermorePolarizedComptonModel::Initial <<
202 G4VEmModel* masterModel) <<
203 { <<
204 SetElementSelectors(masterModel->GetElementS <<
205 } <<
206 <<
207 //....oooOO0OOooo........oooOO0OOooo........oo <<
208 <<
209 void G4LivermorePolarizedComptonModel::ReadDat <<
210 { <<
211 if (verboseLevel > 1) <<
212 { <<
213 G4cout << "G4LivermorePolarizedComptonMo <<
214 << G4endl; <<
215 } <<
216 if(data[Z]) { return; } <<
217 const char* datadir = path; <<
218 if(!datadir) <<
219 { <<
220 datadir = G4FindDataDir("G4LEDATA"); <<
221 if(!datadir) <<
222 { <<
223 G4Exception("G4LivermorePolarizedComptonMo <<
224 "em0006",FatalException, <<
225 "Environment variable G4LEDATA not d <<
226 return; <<
227 } <<
228 } <<
229 <<
230 data[Z] = new G4PhysicsFreeVector(); <<
231 <<
232 std::ostringstream ost; <<
233 ost << datadir << "/livermore/comp/ce-cs-" < <<
234 std::ifstream fin(ost.str().c_str()); <<
235 <<
236 if( !fin.is_open()) <<
237 { <<
238 G4ExceptionDescription ed; <<
239 ed << "G4LivermorePolarizedComptonModel <<
240 << "> is not opened!" << G4endl; <<
241 G4Exception("G4LivermoreComptonModel::Re <<
242 "em0003",FatalException, <<
243 ed,"G4LEDATA version should be G4EMLOW8. <<
244 return; <<
245 } else { <<
246 if(verboseLevel > 3) { <<
247 G4cout << "File " << ost.str() <<
248 << " is opened by G4LivermorePolarizedC <<
249 } <<
250 data[Z]->Retrieve(fin, true); <<
251 data[Z]->ScaleVector(MeV, MeV*barn); <<
252 } <<
253 fin.close(); <<
254 } <<
255 <<
256 //....oooOO0OOooo........oooOO0OOooo........oo 137 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
257 138
258 G4double G4LivermorePolarizedComptonModel::Com 139 G4double G4LivermorePolarizedComptonModel::ComputeCrossSectionPerAtom(
259 const G 140 const G4ParticleDefinition*,
260 G 141 G4double GammaEnergy,
261 G 142 G4double Z, G4double,
262 G 143 G4double, G4double)
263 { 144 {
264 if (verboseLevel > 3) 145 if (verboseLevel > 3)
265 G4cout << "Calling ComputeCrossSectionPerA 146 G4cout << "Calling ComputeCrossSectionPerAtom() of G4LivermorePolarizedComptonModel" << G4endl;
266 147
267 G4double cs = 0.0; << 148 if (GammaEnergy < lowEnergyLimit || GammaEnergy > highEnergyLimit) return 0.0;
268 <<
269 if (GammaEnergy < LowEnergyLimit()) <<
270 return 0.0; <<
271 149
272 G4int intZ = G4lrint(Z); << 150 G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy);
273 if(intZ < 1 || intZ > maxZ) { return cs; } <<
274 <<
275 G4PhysicsFreeVector* pv = data[intZ]; <<
276 <<
277 // if element was not initialised <<
278 // do initialisation safely for MT mode <<
279 if(!pv) <<
280 { <<
281 InitialiseForElement(0, intZ); <<
282 pv = data[intZ]; <<
283 if(!pv) { return cs; } <<
284 } <<
285 <<
286 G4int n = G4int(pv->GetVectorLength() - 1); <<
287 G4double e1 = pv->Energy(0); <<
288 G4double e2 = pv->Energy(n); <<
289 <<
290 if(GammaEnergy <= e1) { cs = GammaEnerg <<
291 else if(GammaEnergy <= e2) { cs = pv->Value( <<
292 else if(GammaEnergy > e2) { cs = pv->Value( <<
293 <<
294 return cs; 151 return cs;
295 <<
296 } 152 }
297 153
298 //....oooOO0OOooo........oooOO0OOooo........oo 154 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
299 155
300 void G4LivermorePolarizedComptonModel::SampleS 156 void G4LivermorePolarizedComptonModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
301 const G4MaterialCutsCouple* co 157 const G4MaterialCutsCouple* couple,
302 const G4DynamicParticle* aDyna 158 const G4DynamicParticle* aDynamicGamma,
303 G4double, 159 G4double,
304 G4double) 160 G4double)
305 { 161 {
306 // The scattered gamma energy is sampled acc 162 // The scattered gamma energy is sampled according to Klein - Nishina formula.
307 // The random number techniques of Butcher & 163 // The random number techniques of Butcher & Messel are used (Nuc Phys 20(1960),15).
308 // GEANT4 internal units 164 // GEANT4 internal units
309 // 165 //
310 // Note : Effects due to binding of atomic e 166 // Note : Effects due to binding of atomic electrons are negliged.
311 167
312 if (verboseLevel > 3) 168 if (verboseLevel > 3)
313 G4cout << "Calling SampleSecondaries() of 169 G4cout << "Calling SampleSecondaries() of G4LivermorePolarizedComptonModel" << G4endl;
314 170
315 G4double gammaEnergy0 = aDynamicGamma->GetKi 171 G4double gammaEnergy0 = aDynamicGamma->GetKineticEnergy();
316 <<
317 // do nothing below the threshold <<
318 // should never get here because the XS is z <<
319 if (gammaEnergy0 < LowEnergyLimit()) <<
320 return ; <<
321 <<
322 G4ThreeVector gammaPolarization0 = aDynamicG 172 G4ThreeVector gammaPolarization0 = aDynamicGamma->GetPolarization();
323 173
324 // Protection: a polarisation parallel to th 174 // Protection: a polarisation parallel to the
325 // direction causes problems; 175 // direction causes problems;
326 // in that case find a random polarization 176 // in that case find a random polarization
>> 177
327 G4ThreeVector gammaDirection0 = aDynamicGamm 178 G4ThreeVector gammaDirection0 = aDynamicGamma->GetMomentumDirection();
328 179
329 // Make sure that the polarization vector is 180 // Make sure that the polarization vector is perpendicular to the
330 // gamma direction. If not 181 // gamma direction. If not
>> 182
331 if(!(gammaPolarization0.isOrthogonal(gammaDi 183 if(!(gammaPolarization0.isOrthogonal(gammaDirection0, 1e-6))||(gammaPolarization0.mag()==0))
332 { // only for testing now 184 { // only for testing now
333 gammaPolarization0 = GetRandomPolarizati 185 gammaPolarization0 = GetRandomPolarization(gammaDirection0);
334 } 186 }
335 else 187 else
336 { 188 {
337 if ( gammaPolarization0.howOrthogonal(ga 189 if ( gammaPolarization0.howOrthogonal(gammaDirection0) != 0)
338 { 190 {
339 gammaPolarization0 = GetPerpendicularPolar 191 gammaPolarization0 = GetPerpendicularPolarization(gammaDirection0, gammaPolarization0);
340 } 192 }
341 } 193 }
>> 194
342 // End of Protection 195 // End of Protection
343 196
>> 197 // Within energy limit?
>> 198
>> 199 if(gammaEnergy0 <= lowEnergyLimit)
>> 200 {
>> 201 fParticleChange->ProposeTrackStatus(fStopAndKill);
>> 202 fParticleChange->SetProposedKineticEnergy(0.);
>> 203 fParticleChange->ProposeLocalEnergyDeposit(gammaEnergy0);
>> 204 return;
>> 205 }
>> 206
344 G4double E0_m = gammaEnergy0 / electron_mass 207 G4double E0_m = gammaEnergy0 / electron_mass_c2 ;
345 208
346 // Select randomly one element in the curren 209 // Select randomly one element in the current material
347 //G4int Z = crossSectionHandler->SelectRando 210 //G4int Z = crossSectionHandler->SelectRandomAtom(couple,gammaEnergy0);
348 const G4ParticleDefinition* particle = aDyn 211 const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition();
349 const G4Element* elm = SelectRandomAtom(coup 212 const G4Element* elm = SelectRandomAtom(couple,particle,gammaEnergy0);
350 G4int Z = (G4int)elm->GetZ(); 213 G4int Z = (G4int)elm->GetZ();
351 214
352 // Sample the energy and the polarization of 215 // Sample the energy and the polarization of the scattered photon
>> 216
353 G4double epsilon, epsilonSq, onecost, sinThe 217 G4double epsilon, epsilonSq, onecost, sinThetaSqr, greject ;
354 218
355 G4double epsilon0Local = 1./(1. + 2*E0_m); << 219 G4double epsilon0 = 1./(1. + 2*E0_m);
356 G4double epsilon0Sq = epsilon0Local*epsilon0 << 220 G4double epsilon0Sq = epsilon0*epsilon0;
357 G4double alpha1 = - G4Log(epsilon0Local); << 221 G4double alpha1 = - std::log(epsilon0);
358 G4double alpha2 = 0.5*(1.- epsilon0Sq); 222 G4double alpha2 = 0.5*(1.- epsilon0Sq);
359 223
360 G4double wlGamma = h_Planck*c_light/gammaEne 224 G4double wlGamma = h_Planck*c_light/gammaEnergy0;
361 G4double gammaEnergy1; 225 G4double gammaEnergy1;
362 G4ThreeVector gammaDirection1; 226 G4ThreeVector gammaDirection1;
363 227
364 do { 228 do {
365 if ( alpha1/(alpha1+alpha2) > G4UniformRan 229 if ( alpha1/(alpha1+alpha2) > G4UniformRand() )
366 { 230 {
367 epsilon = G4Exp(-alpha1*G4UniformRand()); << 231 epsilon = std::exp(-alpha1*G4UniformRand());
368 epsilonSq = epsilon*epsilon; 232 epsilonSq = epsilon*epsilon;
369 } 233 }
370 else 234 else
371 { 235 {
372 epsilonSq = epsilon0Sq + (1.- epsilon0Sq)*G4 236 epsilonSq = epsilon0Sq + (1.- epsilon0Sq)*G4UniformRand();
373 epsilon = std::sqrt(epsilonSq); 237 epsilon = std::sqrt(epsilonSq);
374 } 238 }
375 239
376 onecost = (1.- epsilon)/(epsilon*E0_m); 240 onecost = (1.- epsilon)/(epsilon*E0_m);
377 sinThetaSqr = onecost*(2.-onecost); 241 sinThetaSqr = onecost*(2.-onecost);
378 242
379 // Protection 243 // Protection
380 if (sinThetaSqr > 1.) 244 if (sinThetaSqr > 1.)
381 { 245 {
382 G4cout 246 G4cout
383 << " -- Warning -- G4LivermorePolarizedCom 247 << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries "
384 << "sin(theta)**2 = " 248 << "sin(theta)**2 = "
385 << sinThetaSqr 249 << sinThetaSqr
386 << "; set to 1" 250 << "; set to 1"
387 << G4endl; 251 << G4endl;
388 sinThetaSqr = 1.; 252 sinThetaSqr = 1.;
389 } 253 }
390 if (sinThetaSqr < 0.) 254 if (sinThetaSqr < 0.)
391 { 255 {
392 G4cout 256 G4cout
393 << " -- Warning -- G4LivermorePolarizedCom 257 << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries "
394 << "sin(theta)**2 = " 258 << "sin(theta)**2 = "
395 << sinThetaSqr 259 << sinThetaSqr
396 << "; set to 0" 260 << "; set to 0"
397 << G4endl; 261 << G4endl;
398 sinThetaSqr = 0.; 262 sinThetaSqr = 0.;
399 } 263 }
400 // End protection 264 // End protection
401 265
402 G4double x = std::sqrt(onecost/2.) / (wlG 266 G4double x = std::sqrt(onecost/2.) / (wlGamma/cm);;
403 G4double scatteringFunction = scatterFunct 267 G4double scatteringFunction = scatterFunctionData->FindValue(x,Z-1);
404 greject = (1. - epsilon*sinThetaSqr/(1.+ e 268 greject = (1. - epsilon*sinThetaSqr/(1.+ epsilonSq))*scatteringFunction;
405 269
406 } while(greject < G4UniformRand()*Z); 270 } while(greject < G4UniformRand()*Z);
407 271
408 272
409 // ***************************************** 273 // ****************************************************
410 // Phi determination 274 // Phi determination
411 // ***************************************** 275 // ****************************************************
>> 276
412 G4double phi = SetPhi(epsilon,sinThetaSqr); 277 G4double phi = SetPhi(epsilon,sinThetaSqr);
413 278
414 // 279 //
415 // scattered gamma angles. ( Z - axis along 280 // scattered gamma angles. ( Z - axis along the parent gamma)
416 // 281 //
>> 282
417 G4double cosTheta = 1. - onecost; 283 G4double cosTheta = 1. - onecost;
418 284
419 // Protection 285 // Protection
>> 286
420 if (cosTheta > 1.) 287 if (cosTheta > 1.)
421 { 288 {
422 G4cout 289 G4cout
423 << " -- Warning -- G4LivermorePolarizedCompt 290 << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries "
424 << "cosTheta = " 291 << "cosTheta = "
425 << cosTheta 292 << cosTheta
426 << "; set to 1" 293 << "; set to 1"
427 << G4endl; 294 << G4endl;
428 cosTheta = 1.; 295 cosTheta = 1.;
429 } 296 }
430 if (cosTheta < -1.) 297 if (cosTheta < -1.)
431 { 298 {
432 G4cout 299 G4cout
433 << " -- Warning -- G4LivermorePolarizedCompt 300 << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries "
434 << "cosTheta = " 301 << "cosTheta = "
435 << cosTheta 302 << cosTheta
436 << "; set to -1" 303 << "; set to -1"
437 << G4endl; 304 << G4endl;
438 cosTheta = -1.; 305 cosTheta = -1.;
439 } 306 }
440 // End protection 307 // End protection
441 << 308
>> 309
442 G4double sinTheta = std::sqrt (sinThetaSqr); 310 G4double sinTheta = std::sqrt (sinThetaSqr);
443 311
444 // Protection 312 // Protection
445 if (sinTheta > 1.) 313 if (sinTheta > 1.)
446 { 314 {
447 G4cout 315 G4cout
448 << " -- Warning -- G4LivermorePolarizedCompt 316 << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries "
449 << "sinTheta = " 317 << "sinTheta = "
450 << sinTheta 318 << sinTheta
451 << "; set to 1" 319 << "; set to 1"
452 << G4endl; 320 << G4endl;
453 sinTheta = 1.; 321 sinTheta = 1.;
454 } 322 }
455 if (sinTheta < -1.) 323 if (sinTheta < -1.)
456 { 324 {
457 G4cout 325 G4cout
458 << " -- Warning -- G4LivermorePolarizedCompt 326 << " -- Warning -- G4LivermorePolarizedComptonModel::SampleSecondaries "
459 << "sinTheta = " 327 << "sinTheta = "
460 << sinTheta 328 << sinTheta
461 << "; set to -1" 329 << "; set to -1"
462 << G4endl; 330 << G4endl;
463 sinTheta = -1.; 331 sinTheta = -1.;
464 } 332 }
465 // End protection 333 // End protection
466 334
467 // Check for entanglement and re-sample phi <<
468 <<
469 const auto* auxInfo <<
470 = fParticleChange->GetCurrentTrack()->GetAux <<
471 if (auxInfo) { <<
472 const auto* entanglementAuxInfo = dynamic_ <<
473 if (entanglementAuxInfo) { <<
474 auto* clipBoard = dynamic_cast<G4eplusAn <<
475 (entanglementAuxInfo->GetEntanglementCli <<
476 if (clipBoard) { <<
477 // This is an entangled photon from ep <<
478 // If this is the first scatter of the <<
479 // phi on the clipboard. <<
480 // If this is the first scatter of the <<
481 // phi of the first scatter of the fir <<
482 // theta of the second photon, to samp <<
483 if (clipBoard->IsTrack1Measurement()) <<
484 // Check we have the relevant track. <<
485 // necessary but I want to be sure t <<
486 // entangled system are properly pai <<
487 // Note: the tracking manager pops t <<
488 // will rely on that. (If not, the <<
489 // more complicated to ensure we mat <<
490 // So our track 1 is clipboard track <<
491 if (clipBoard->GetTrackB() == fParti <<
492 // This is the first scatter of th <<
493 // // Debug <<
494 // auto* track1 = fPart <<
495 // G4cout <<
496 // << "This is the firs <<
497 // << "\nTrack: " << tr <<
498 // << ", Parent: " << t <<
499 // << ", Name: " << cli <<
500 // << G4endl; <<
501 // // End debug <<
502 clipBoard->ResetTrack1Measurement( <<
503 // Store cos(theta),phi of first p <<
504 clipBoard->SetComptonCosTheta1(cos <<
505 clipBoard->SetComptonPhi1(phi); <<
506 } <<
507 } else if (clipBoard->IsTrack2Measurem <<
508 // Check we have the relevant track. <<
509 // Remember our track 2 is clipboard <<
510 if (clipBoard->GetTrackA() == fParti <<
511 // This is the first scatter of th <<
512 // // Debug <<
513 // auto* track2 = fPart <<
514 // G4cout <<
515 // << "This is the firs <<
516 // << "\nTrack: " << tr <<
517 // << ", Parent: " << t <<
518 // << ", Name: " << cli <<
519 // << G4endl; <<
520 // // End debug <<
521 clipBoard->ResetTrack2Measurement( <<
522 <<
523 // Get cos(theta),phi of first pho <<
524 const G4double& cosTheta1 = clipBo <<
525 const G4double& phi1 = clipBoard-> <<
526 // For clarity make aliases for th <<
527 const G4double& cosTheta2 = cosThe <<
528 G4double& phi2 = phi; <<
529 // G4cout << "cosTheta1 <<
530 // G4cout << "cosTheta2 <<
531 <<
532 // Re-sample phi <<
533 // Draw the difference of azimutha <<
534 // A + B * cos(2*deltaPhi), or rat <<
535 // C = A / (A + |B|) and D = B / ( <<
536 const G4double sin2Theta1 = 1.-cos <<
537 const G4double sin2Theta2 = 1.-cos <<
538 <<
539 // Pryce and Ward, Nature No 4065 <<
540 auto* g4Pow = G4Pow::GetInstance() <<
541 const G4double A = <<
542 ((g4Pow->powN(1.-cosTheta1,3))+2.) <<
543 ((g4Pow->powN(2.-cosTheta1,3)*g4Po <<
544 const G4double B = -(sin2Theta1*si <<
545 ((g4Pow->powN(2.-cosTheta1,2)*g4Po <<
546 <<
547 // // Snyder et al, Physical Re <<
548 // // (This is an alternative f <<
549 // const G4double& k0 = gammaEn <<
550 // const G4double k1 = k0/(2.-c <<
551 // const G4double k2 = k0/(2.-c <<
552 // const G4double gamma1 = k1/k <<
553 // const G4double gamma2 = k2/k <<
554 // const G4double A1 = gamma1*g <<
555 // const G4double B1 = 2.*sin2T <<
556 // // That's A1 + B1*sin2(delta <<
557 // const G4double A = A1 + 0.5* <<
558 // const G4double B = -0.5*B1; <<
559 <<
560 const G4double maxValue = A + std: <<
561 const G4double C = A / maxValue; <<
562 const G4double D = B / maxValue; <<
563 // G4cout << "A,B,C,D: " << A < <<
564 <<
565 // Sample delta phi <<
566 G4double deltaPhi; <<
567 const G4int maxCount = 999999; <<
568 G4int iCount = 0; <<
569 for (; iCount < maxCount; ++iCount <<
570 deltaPhi = twopi * G4UniformRand <<
571 if (G4UniformRand() < C + D * co <<
572 } <<
573 if (iCount >= maxCount ) { <<
574 G4cout << "G4LivermorePolarizedC <<
575 << "Re-sampled delta phi not fou <<
576 << " tries - carrying on anyway. <<
577 } <<
578 <<
579 // Thus, the desired second photon <<
580 phi2 = deltaPhi - phi1 + halfpi; <<
581 // The minus sign is in above stat <<
582 // annihilation photons are in opp <<
583 // are measured in the opposite di <<
584 // halfpi is added for the followi <<
585 // In this function phi is relativ <<
586 // SystemOfRefChange below. We kno <<
587 // the polarisations of the two an <<
588 // to each other, i.e., halfpi dif <<
589 // Furthermore, only sin(phi) and <<
590 // need to place any range constra <<
591 // if (phi2 > pi) { <<
592 // phi2 -= twopi; <<
593 // } <<
594 // if (phi2 < -pi) { <<
595 // phi2 += twopi; <<
596 // } <<
597 } <<
598 } <<
599 } <<
600 } <<
601 } <<
602 <<
603 // End of entanglement <<
604 335
605 G4double dirx = sinTheta*std::cos(phi); 336 G4double dirx = sinTheta*std::cos(phi);
606 G4double diry = sinTheta*std::sin(phi); 337 G4double diry = sinTheta*std::sin(phi);
607 G4double dirz = cosTheta ; 338 G4double dirz = cosTheta ;
608 << 339
>> 340
609 // oneCosT , eom 341 // oneCosT , eom
610 342
611 // Doppler broadening - Method based on: 343 // Doppler broadening - Method based on:
612 // Y. Namito, S. Ban and H. Hirayama, 344 // Y. Namito, S. Ban and H. Hirayama,
613 // "Implementation of the Doppler Broadening 345 // "Implementation of the Doppler Broadening of a Compton-Scattered Photon Into the EGS4 Code"
614 // NIM A 349, pp. 489-494, 1994 346 // NIM A 349, pp. 489-494, 1994
615 347
616 // Maximum number of sampling iterations 348 // Maximum number of sampling iterations
617 static G4int maxDopplerIterations = 1000; << 349
>> 350 G4int maxDopplerIterations = 1000;
618 G4double bindingE = 0.; 351 G4double bindingE = 0.;
619 G4double photonEoriginal = epsilon * gammaEn 352 G4double photonEoriginal = epsilon * gammaEnergy0;
620 G4double photonE = -1.; 353 G4double photonE = -1.;
621 G4int iteration = 0; 354 G4int iteration = 0;
622 G4double eMax = gammaEnergy0; 355 G4double eMax = gammaEnergy0;
623 356
624 G4int shellIdx = 0; <<
625 <<
626 if (verboseLevel > 3) { <<
627 G4cout << "Started loop to sample broading <<
628 } <<
629 <<
630 do 357 do
631 { 358 {
632 iteration++; 359 iteration++;
633 // Select shell based on shell occupancy 360 // Select shell based on shell occupancy
634 shellIdx = shellData->SelectRandomShell( << 361 G4int shell = shellData.SelectRandomShell(Z);
635 bindingE = shellData->BindingEnergy(Z,sh << 362 bindingE = shellData.BindingEnergy(Z,shell);
636 363
637 if (verboseLevel > 3) { <<
638 G4cout << "Shell ID= " << shellIdx <<
639 << " Ebind(keV)= " << bindingE/keV << <<
640 } <<
641 eMax = gammaEnergy0 - bindingE; 364 eMax = gammaEnergy0 - bindingE;
642 << 365
643 // Randomly sample bound electron moment 366 // Randomly sample bound electron momentum (memento: the data set is in Atomic Units)
644 G4double pSample = profileData->RandomSe << 367 G4double pSample = profileData.RandomSelectMomentum(Z,shell);
645 <<
646 if (verboseLevel > 3) { <<
647 G4cout << "pSample= " << pSample << G4e <<
648 } <<
649 // Rescale from atomic units 368 // Rescale from atomic units
650 G4double pDoppler = pSample * fine_struc 369 G4double pDoppler = pSample * fine_structure_const;
651 G4double pDoppler2 = pDoppler * pDoppler 370 G4double pDoppler2 = pDoppler * pDoppler;
652 G4double var2 = 1. + onecost * E0_m; 371 G4double var2 = 1. + onecost * E0_m;
653 G4double var3 = var2*var2 - pDoppler2; 372 G4double var3 = var2*var2 - pDoppler2;
654 G4double var4 = var2 - pDoppler2 * cosTh 373 G4double var4 = var2 - pDoppler2 * cosTheta;
655 G4double var = var4*var4 - var3 + pDoppl 374 G4double var = var4*var4 - var3 + pDoppler2 * var3;
656 if (var > 0.) 375 if (var > 0.)
657 { 376 {
658 G4double varSqrt = std::sqrt(var); 377 G4double varSqrt = std::sqrt(var);
659 G4double scale = gammaEnergy0 / var3; 378 G4double scale = gammaEnergy0 / var3;
660 // Random select either root 379 // Random select either root
661 if (G4UniformRand() < 0.5) photonE = (var4 380 if (G4UniformRand() < 0.5) photonE = (var4 - varSqrt) * scale;
662 else photonE = (var4 + varSqrt) * scale; 381 else photonE = (var4 + varSqrt) * scale;
663 } 382 }
664 else 383 else
665 { 384 {
666 photonE = -1.; 385 photonE = -1.;
667 } 386 }
668 } while ( iteration <= maxDopplerIterations 387 } while ( iteration <= maxDopplerIterations &&
669 (photonE < 0. || photonE > eMax || phot 388 (photonE < 0. || photonE > eMax || photonE < eMax*G4UniformRand()) );
670 << 389
671 // End of recalculation of photon energy wit 390 // End of recalculation of photon energy with Doppler broadening
672 // Revert to original if maximum number of i 391 // Revert to original if maximum number of iterations threshold has been reached
673 if (iteration >= maxDopplerIterations) 392 if (iteration >= maxDopplerIterations)
674 { 393 {
675 photonE = photonEoriginal; 394 photonE = photonEoriginal;
676 bindingE = 0.; 395 bindingE = 0.;
677 } 396 }
678 397
679 gammaEnergy1 = photonE; 398 gammaEnergy1 = photonE;
680 399
681 // 400 //
682 // update G4VParticleChange for the scattere 401 // update G4VParticleChange for the scattered photon
683 // 402 //
>> 403
>> 404 // gammaEnergy1 = epsilon*gammaEnergy0;
>> 405
>> 406
684 // New polarization 407 // New polarization
>> 408
685 G4ThreeVector gammaPolarization1 = SetNewPol 409 G4ThreeVector gammaPolarization1 = SetNewPolarization(epsilon,
686 sinThetaSqr, 410 sinThetaSqr,
687 phi, 411 phi,
688 cosTheta); 412 cosTheta);
689 413
690 // Set new direction 414 // Set new direction
691 G4ThreeVector tmpDirection1( dirx,diry,dirz 415 G4ThreeVector tmpDirection1( dirx,diry,dirz );
692 gammaDirection1 = tmpDirection1; 416 gammaDirection1 = tmpDirection1;
693 417
694 // Change reference frame. 418 // Change reference frame.
>> 419
695 SystemOfRefChange(gammaDirection0,gammaDirec 420 SystemOfRefChange(gammaDirection0,gammaDirection1,
696 gammaPolarization0,gammaPolarization1) 421 gammaPolarization0,gammaPolarization1);
697 422
698 if (gammaEnergy1 > 0.) 423 if (gammaEnergy1 > 0.)
699 { 424 {
700 fParticleChange->SetProposedKineticEnerg 425 fParticleChange->SetProposedKineticEnergy( gammaEnergy1 ) ;
701 fParticleChange->ProposeMomentumDirectio 426 fParticleChange->ProposeMomentumDirection( gammaDirection1 );
702 fParticleChange->ProposePolarization( ga 427 fParticleChange->ProposePolarization( gammaPolarization1 );
703 } 428 }
704 else 429 else
705 { 430 {
706 gammaEnergy1 = 0.; 431 gammaEnergy1 = 0.;
707 fParticleChange->SetProposedKineticEnerg 432 fParticleChange->SetProposedKineticEnergy(0.) ;
708 fParticleChange->ProposeTrackStatus(fSto 433 fParticleChange->ProposeTrackStatus(fStopAndKill);
709 } 434 }
710 435
711 // 436 //
712 // kinematic of the scattered electron 437 // kinematic of the scattered electron
713 // 438 //
>> 439
714 G4double ElecKineEnergy = gammaEnergy0 - gam 440 G4double ElecKineEnergy = gammaEnergy0 - gammaEnergy1 -bindingE;
715 441
716 // SI -protection against negative final ene 442 // SI -protection against negative final energy: no e- is created
717 // like in G4LivermoreComptonModel.cc 443 // like in G4LivermoreComptonModel.cc
718 if(ElecKineEnergy < 0.0) { 444 if(ElecKineEnergy < 0.0) {
719 fParticleChange->ProposeLocalEnergyDeposit 445 fParticleChange->ProposeLocalEnergyDeposit(gammaEnergy0 - gammaEnergy1);
720 return; 446 return;
721 } 447 }
722 448
>> 449 // SI - Removed range test
>> 450
723 G4double ElecMomentum = std::sqrt(ElecKineEn 451 G4double ElecMomentum = std::sqrt(ElecKineEnergy*(ElecKineEnergy+2.*electron_mass_c2));
724 452
725 G4ThreeVector ElecDirection((gammaEnergy0 * 453 G4ThreeVector ElecDirection((gammaEnergy0 * gammaDirection0 -
726 gammaEnergy1 * gammaDirection1) * ( 454 gammaEnergy1 * gammaDirection1) * (1./ElecMomentum));
727 455
728 G4DynamicParticle* dp = <<
729 new G4DynamicParticle (G4Electron::Electro <<
730 fvect->push_back(dp); <<
731 <<
732 // sample deexcitation <<
733 // <<
734 if (verboseLevel > 3) { <<
735 G4cout << "Started atomic de-excitation " <<
736 } <<
737 <<
738 if(fAtomDeexcitation && iteration < maxDoppl <<
739 G4int index = couple->GetIndex(); <<
740 if(fAtomDeexcitation->CheckDeexcitationAct <<
741 std::size_t nbefore = fvect->size(); <<
742 G4AtomicShellEnumerator as = G4AtomicShe <<
743 const G4AtomicShell* shell = fAtomDeexci <<
744 fAtomDeexcitation->GenerateParticles(fve <<
745 std::size_t nafter = fvect->size(); <<
746 if(nafter > nbefore) { <<
747 for (std::size_t i=nbefore; i<nafter; ++i) { <<
748 //Check if there is enough residual energy <<
749 if (bindingE >= ((*fvect)[i])->GetKineticE <<
750 { <<
751 //Ok, this is a valid secondary: <<
752 bindingE -= ((*fvect)[i])->GetKineticE <<
753 } <<
754 else <<
755 { <<
756 //Invalid secondary: not enough energy <<
757 //Keep its energy in the local deposit <<
758 delete (*fvect)[i]; <<
759 (*fvect)[i]=0; <<
760 } <<
761 } <<
762 } <<
763 } <<
764 } <<
765 //This should never happen <<
766 if(bindingE < 0.0) <<
767 G4Exception("G4LivermoreComptonModel::Samp <<
768 "em2050",FatalException,"Negative local en <<
769 <<
770 fParticleChange->ProposeLocalEnergyDeposit(b 456 fParticleChange->ProposeLocalEnergyDeposit(bindingE);
>> 457
>> 458 G4DynamicParticle* dp = new G4DynamicParticle (G4Electron::Electron(),ElecDirection.unit(),ElecKineEnergy) ;
>> 459 fvect->push_back(dp);
771 460
772 } 461 }
773 462
774 //....oooOO0OOooo........oooOO0OOooo........oo 463 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
775 464
776 G4double G4LivermorePolarizedComptonModel::Set 465 G4double G4LivermorePolarizedComptonModel::SetPhi(G4double energyRate,
777 G4double sinSqrTh) 466 G4double sinSqrTh)
778 { 467 {
779 G4double rand1; 468 G4double rand1;
780 G4double rand2; 469 G4double rand2;
781 G4double phiProbability; 470 G4double phiProbability;
782 G4double phi; 471 G4double phi;
783 G4double a, b; 472 G4double a, b;
784 473
785 do 474 do
786 { 475 {
787 rand1 = G4UniformRand(); 476 rand1 = G4UniformRand();
788 rand2 = G4UniformRand(); 477 rand2 = G4UniformRand();
789 phiProbability=0.; 478 phiProbability=0.;
790 phi = twopi*rand1; 479 phi = twopi*rand1;
791 480
792 a = 2*sinSqrTh; 481 a = 2*sinSqrTh;
793 b = energyRate + 1/energyRate; 482 b = energyRate + 1/energyRate;
794 483
795 phiProbability = 1 - (a/b)*(std::cos(phi 484 phiProbability = 1 - (a/b)*(std::cos(phi)*std::cos(phi));
>> 485
>> 486
>> 487
796 } 488 }
797 while ( rand2 > phiProbability ); 489 while ( rand2 > phiProbability );
798 return phi; 490 return phi;
799 } 491 }
800 492
801 493
802 //....oooOO0OOooo........oooOO0OOooo........oo 494 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
803 495
804 G4ThreeVector G4LivermorePolarizedComptonModel 496 G4ThreeVector G4LivermorePolarizedComptonModel::SetPerpendicularVector(G4ThreeVector& a)
805 { 497 {
806 G4double dx = a.x(); 498 G4double dx = a.x();
807 G4double dy = a.y(); 499 G4double dy = a.y();
808 G4double dz = a.z(); 500 G4double dz = a.z();
809 G4double x = dx < 0.0 ? -dx : dx; 501 G4double x = dx < 0.0 ? -dx : dx;
810 G4double y = dy < 0.0 ? -dy : dy; 502 G4double y = dy < 0.0 ? -dy : dy;
811 G4double z = dz < 0.0 ? -dz : dz; 503 G4double z = dz < 0.0 ? -dz : dz;
812 if (x < y) { 504 if (x < y) {
813 return x < z ? G4ThreeVector(-dy,dx,0) : G 505 return x < z ? G4ThreeVector(-dy,dx,0) : G4ThreeVector(0,-dz,dy);
814 }else{ 506 }else{
815 return y < z ? G4ThreeVector(dz,0,-dx) : G 507 return y < z ? G4ThreeVector(dz,0,-dx) : G4ThreeVector(-dy,dx,0);
816 } 508 }
817 } 509 }
818 510
819 //....oooOO0OOooo........oooOO0OOooo........oo 511 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
820 512
821 G4ThreeVector G4LivermorePolarizedComptonModel 513 G4ThreeVector G4LivermorePolarizedComptonModel::GetRandomPolarization(G4ThreeVector& direction0)
822 { 514 {
823 G4ThreeVector d0 = direction0.unit(); 515 G4ThreeVector d0 = direction0.unit();
824 G4ThreeVector a1 = SetPerpendicularVector(d0 516 G4ThreeVector a1 = SetPerpendicularVector(d0); //different orthogonal
825 G4ThreeVector a0 = a1.unit(); // unit vector 517 G4ThreeVector a0 = a1.unit(); // unit vector
826 518
827 G4double rand1 = G4UniformRand(); 519 G4double rand1 = G4UniformRand();
828 520
829 G4double angle = twopi*rand1; // random pola 521 G4double angle = twopi*rand1; // random polar angle
830 G4ThreeVector b0 = d0.cross(a0); // cross pr 522 G4ThreeVector b0 = d0.cross(a0); // cross product
831 523
832 G4ThreeVector c; 524 G4ThreeVector c;
833 525
834 c.setX(std::cos(angle)*(a0.x())+std::sin(ang 526 c.setX(std::cos(angle)*(a0.x())+std::sin(angle)*b0.x());
835 c.setY(std::cos(angle)*(a0.y())+std::sin(ang 527 c.setY(std::cos(angle)*(a0.y())+std::sin(angle)*b0.y());
836 c.setZ(std::cos(angle)*(a0.z())+std::sin(ang 528 c.setZ(std::cos(angle)*(a0.z())+std::sin(angle)*b0.z());
837 529
838 G4ThreeVector c0 = c.unit(); 530 G4ThreeVector c0 = c.unit();
839 531
840 return c0; 532 return c0;
>> 533
841 } 534 }
842 535
843 //....oooOO0OOooo........oooOO0OOooo........oo 536 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
844 537
845 G4ThreeVector G4LivermorePolarizedComptonModel 538 G4ThreeVector G4LivermorePolarizedComptonModel::GetPerpendicularPolarization
846 (const G4ThreeVector& gammaDirection, const G4 539 (const G4ThreeVector& gammaDirection, const G4ThreeVector& gammaPolarization) const
847 { 540 {
>> 541
848 // 542 //
849 // The polarization of a photon is always pe 543 // The polarization of a photon is always perpendicular to its momentum direction.
850 // Therefore this function removes those vec 544 // Therefore this function removes those vector component of gammaPolarization, which
851 // points in direction of gammaDirection 545 // points in direction of gammaDirection
852 // 546 //
853 // Mathematically we search the projection o 547 // Mathematically we search the projection of the vector a on the plane E, where n is the
854 // plains normal vector. 548 // plains normal vector.
855 // The basic equation can be found in each g 549 // The basic equation can be found in each geometry book (e.g. Bronstein):
856 // p = a - (a o n)/(n o n)*n 550 // p = a - (a o n)/(n o n)*n
857 551
858 return gammaPolarization - gammaPolarization 552 return gammaPolarization - gammaPolarization.dot(gammaDirection)/gammaDirection.dot(gammaDirection) * gammaDirection;
859 } 553 }
860 554
861 //....oooOO0OOooo........oooOO0OOooo........oo 555 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
862 556
863 G4ThreeVector G4LivermorePolarizedComptonModel 557 G4ThreeVector G4LivermorePolarizedComptonModel::SetNewPolarization(G4double epsilon,
864 G4double sinSqrTh, 558 G4double sinSqrTh,
865 G4double phi, 559 G4double phi,
866 G4double costheta) 560 G4double costheta)
867 { 561 {
868 G4double rand1; 562 G4double rand1;
869 G4double rand2; 563 G4double rand2;
870 G4double cosPhi = std::cos(phi); 564 G4double cosPhi = std::cos(phi);
871 G4double sinPhi = std::sin(phi); 565 G4double sinPhi = std::sin(phi);
872 G4double sinTheta = std::sqrt(sinSqrTh); 566 G4double sinTheta = std::sqrt(sinSqrTh);
873 G4double cosSqrPhi = cosPhi*cosPhi; 567 G4double cosSqrPhi = cosPhi*cosPhi;
874 // G4double cossqrth = 1.-sinSqrTh; 568 // G4double cossqrth = 1.-sinSqrTh;
875 // G4double sinsqrphi = sinPhi*sinPhi; 569 // G4double sinsqrphi = sinPhi*sinPhi;
876 G4double normalisation = std::sqrt(1. - cosS 570 G4double normalisation = std::sqrt(1. - cosSqrPhi*sinSqrTh);
877 571
>> 572
878 // Determination of Theta 573 // Determination of Theta
>> 574
>> 575 // ---- MGP ---- Commented out the following 3 lines to avoid compilation
>> 576 // warnings (unused variables)
>> 577 // G4double thetaProbability;
879 G4double theta; 578 G4double theta;
>> 579 // G4double a, b;
>> 580 // G4double cosTheta;
>> 581
>> 582 /*
>> 583
>> 584 depaola method
>> 585
>> 586 do
>> 587 {
>> 588 rand1 = G4UniformRand();
>> 589 rand2 = G4UniformRand();
>> 590 thetaProbability=0.;
>> 591 theta = twopi*rand1;
>> 592 a = 4*normalisation*normalisation;
>> 593 b = (epsilon + 1/epsilon) - 2;
>> 594 thetaProbability = (b + a*std::cos(theta)*std::cos(theta))/(a+b);
>> 595 cosTheta = std::cos(theta);
>> 596 }
>> 597 while ( rand2 > thetaProbability );
>> 598
>> 599 G4double cosBeta = cosTheta;
>> 600
>> 601 */
>> 602
880 603
881 // Dan Xu method (IEEE TNS, 52, 1160 (2005)) 604 // Dan Xu method (IEEE TNS, 52, 1160 (2005))
>> 605
882 rand1 = G4UniformRand(); 606 rand1 = G4UniformRand();
883 rand2 = G4UniformRand(); 607 rand2 = G4UniformRand();
884 608
885 if (rand1<(epsilon+1.0/epsilon-2)/(2.0*(epsi 609 if (rand1<(epsilon+1.0/epsilon-2)/(2.0*(epsilon+1.0/epsilon)-4.0*sinSqrTh*cosSqrPhi))
886 { 610 {
887 if (rand2<0.5) 611 if (rand2<0.5)
888 theta = pi/2.0; 612 theta = pi/2.0;
889 else 613 else
890 theta = 3.0*pi/2.0; 614 theta = 3.0*pi/2.0;
891 } 615 }
892 else 616 else
893 { 617 {
894 if (rand2<0.5) 618 if (rand2<0.5)
895 theta = 0; 619 theta = 0;
896 else 620 else
897 theta = pi; 621 theta = pi;
898 } 622 }
899 G4double cosBeta = std::cos(theta); 623 G4double cosBeta = std::cos(theta);
900 G4double sinBeta = std::sqrt(1-cosBeta*cosBe 624 G4double sinBeta = std::sqrt(1-cosBeta*cosBeta);
901 625
902 G4ThreeVector gammaPolarization1; 626 G4ThreeVector gammaPolarization1;
903 627
904 G4double xParallel = normalisation*cosBeta; 628 G4double xParallel = normalisation*cosBeta;
905 G4double yParallel = -(sinSqrTh*cosPhi*sinPh 629 G4double yParallel = -(sinSqrTh*cosPhi*sinPhi)*cosBeta/normalisation;
906 G4double zParallel = -(costheta*sinTheta*cos 630 G4double zParallel = -(costheta*sinTheta*cosPhi)*cosBeta/normalisation;
907 G4double xPerpendicular = 0.; 631 G4double xPerpendicular = 0.;
908 G4double yPerpendicular = (costheta)*sinBeta 632 G4double yPerpendicular = (costheta)*sinBeta/normalisation;
909 G4double zPerpendicular = -(sinTheta*sinPhi) 633 G4double zPerpendicular = -(sinTheta*sinPhi)*sinBeta/normalisation;
910 634
911 G4double xTotal = (xParallel + xPerpendicula 635 G4double xTotal = (xParallel + xPerpendicular);
912 G4double yTotal = (yParallel + yPerpendicula 636 G4double yTotal = (yParallel + yPerpendicular);
913 G4double zTotal = (zParallel + zPerpendicula 637 G4double zTotal = (zParallel + zPerpendicular);
914 638
915 gammaPolarization1.setX(xTotal); 639 gammaPolarization1.setX(xTotal);
916 gammaPolarization1.setY(yTotal); 640 gammaPolarization1.setY(yTotal);
917 gammaPolarization1.setZ(zTotal); 641 gammaPolarization1.setZ(zTotal);
918 642
919 return gammaPolarization1; 643 return gammaPolarization1;
>> 644
920 } 645 }
921 646
922 //....oooOO0OOooo........oooOO0OOooo........oo 647 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
923 648
924 void G4LivermorePolarizedComptonModel::SystemO 649 void G4LivermorePolarizedComptonModel::SystemOfRefChange(G4ThreeVector& direction0,
925 G4ThreeVector& direction1, 650 G4ThreeVector& direction1,
926 G4ThreeVector& polarization0, 651 G4ThreeVector& polarization0,
927 G4ThreeVector& polarization1) 652 G4ThreeVector& polarization1)
928 { 653 {
929 // direction0 is the original photon directi 654 // direction0 is the original photon direction ---> z
930 // polarization0 is the original photon pola 655 // polarization0 is the original photon polarization ---> x
931 // need to specify y axis in the real refere 656 // need to specify y axis in the real reference frame ---> y
932 G4ThreeVector Axis_Z0 = direction0.unit(); 657 G4ThreeVector Axis_Z0 = direction0.unit();
933 G4ThreeVector Axis_X0 = polarization0.unit() 658 G4ThreeVector Axis_X0 = polarization0.unit();
934 G4ThreeVector Axis_Y0 = (Axis_Z0.cross(Axis_ 659 G4ThreeVector Axis_Y0 = (Axis_Z0.cross(Axis_X0)).unit(); // to be confirmed;
935 660
936 G4double direction_x = direction1.getX(); 661 G4double direction_x = direction1.getX();
937 G4double direction_y = direction1.getY(); 662 G4double direction_y = direction1.getY();
938 G4double direction_z = direction1.getZ(); 663 G4double direction_z = direction1.getZ();
939 664
940 direction1 = (direction_x*Axis_X0 + directio 665 direction1 = (direction_x*Axis_X0 + direction_y*Axis_Y0 + direction_z*Axis_Z0).unit();
941 G4double polarization_x = polarization1.getX 666 G4double polarization_x = polarization1.getX();
942 G4double polarization_y = polarization1.getY 667 G4double polarization_y = polarization1.getY();
943 G4double polarization_z = polarization1.getZ 668 G4double polarization_z = polarization1.getZ();
944 669
945 polarization1 = (polarization_x*Axis_X0 + po 670 polarization1 = (polarization_x*Axis_X0 + polarization_y*Axis_Y0 + polarization_z*Axis_Z0).unit();
946 671
947 } 672 }
948 673
949 674
950 //....oooOO0OOooo........oooOO0OOooo........oo <<
951 //....oooOO0OOooo........oooOO0OOooo........oo <<
952 <<
953 void <<
954 G4LivermorePolarizedComptonModel::InitialiseFo <<
955 G4int Z) <<
956 { <<
957 G4AutoLock l(&LivermorePolarizedComptonModel <<
958 if(!data[Z]) { ReadData(Z); } <<
959 l.unlock(); <<
960 } <<
961 675