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>> 26 // $Id: G4LivermorePolarizedRayleighModel.cc 66241 2012-12-13 18:34:42Z gunter $
26 // 27 //
27 // Author: Sebastien Incerti 28 // Author: Sebastien Incerti
28 // 30 October 2008 29 // 30 October 2008
29 // on base of G4LowEnergyPolarizedRayl 30 // on base of G4LowEnergyPolarizedRayleigh developed by R. Capra
30 // 31 //
31 // History: 32 // History:
32 // -------- 33 // --------
33 // 02 May 2009 S Incerti as V. Ivanchenko pr 34 // 02 May 2009 S Incerti as V. Ivanchenko proposed in G4LivermoreRayleighModel.cc
34 // 35 //
35 // Cleanup initialisation and generation of se 36 // Cleanup initialisation and generation of secondaries:
36 // - apply internal high-ener 37 // - apply internal high-energy limit only in constructor
37 // - do not apply low-energy 38 // - do not apply low-energy limit (default is 0)
38 // - remove GetMeanFreePath m 39 // - remove GetMeanFreePath method and table
39 // - remove initialisation of 40 // - remove initialisation of element selector
40 // - use G4ElementSelector 41 // - use G4ElementSelector
41 42
42 #include "G4LivermorePolarizedRayleighModel.hh 43 #include "G4LivermorePolarizedRayleighModel.hh"
43 #include "G4PhysicalConstants.hh" 44 #include "G4PhysicalConstants.hh"
44 #include "G4SystemOfUnits.hh" 45 #include "G4SystemOfUnits.hh"
45 #include "G4LogLogInterpolation.hh" <<
46 #include "G4CompositeEMDataSet.hh" <<
47 #include "G4AutoLock.hh" <<
48 46
49 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 48
51 using namespace std; 49 using namespace std;
52 namespace { G4Mutex LivermorePolarizedRayleigh <<
53 50
54 //....oooOO0OOooo........oooOO0OOooo........oo 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
55 52
56 G4PhysicsFreeVector* G4LivermorePolarizedRayle <<
57 G4PhysicsFreeVector* G4LivermorePolarizedRayle <<
58 <<
59 G4LivermorePolarizedRayleighModel::G4Livermore 53 G4LivermorePolarizedRayleighModel::G4LivermorePolarizedRayleighModel(const G4ParticleDefinition*,
60 const G4String& nam) << 54 const G4String& nam)
61 :G4VEmModel(nam),fParticleChange(nullptr),is << 55 :G4VEmModel(nam),fParticleChange(0),isInitialised(false),
>> 56 crossSectionHandler(0),formFactorData(0)
62 { 57 {
63 lowEnergyLimit = 250 * CLHEP::eV; << 58 lowEnergyLimit = 250 * eV;
>> 59 highEnergyLimit = 100 * GeV;
>> 60
>> 61 //SetLowEnergyLimit(lowEnergyLimit);
>> 62 SetHighEnergyLimit(highEnergyLimit);
64 // 63 //
65 verboseLevel= 0; 64 verboseLevel= 0;
66 // Verbosity scale: 65 // Verbosity scale:
67 // 0 = nothing 66 // 0 = nothing
68 // 1 = warning for energy non-conservation 67 // 1 = warning for energy non-conservation
69 // 2 = details of energy budget 68 // 2 = details of energy budget
70 // 3 = calculation of cross sections, file o 69 // 3 = calculation of cross sections, file openings, sampling of atoms
71 // 4 = entering in methods 70 // 4 = entering in methods
72 71
73 if(verboseLevel > 0) { 72 if(verboseLevel > 0) {
74 G4cout << "Livermore Polarized Rayleigh is 73 G4cout << "Livermore Polarized Rayleigh is constructed " << G4endl
75 << "Energy range: " << LowEnergyLim << 74 << "Energy range: "
76 << HighEnergyLimit() / CLHEP::GeV << " Ge << 75 << lowEnergyLimit / eV << " eV - "
77 << G4endl; << 76 << highEnergyLimit / GeV << " GeV"
>> 77 << G4endl;
78 } 78 }
79 } 79 }
80 80
81 //....oooOO0OOooo........oooOO0OOooo........oo 81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
82 82
83 G4LivermorePolarizedRayleighModel::~G4Livermor 83 G4LivermorePolarizedRayleighModel::~G4LivermorePolarizedRayleighModel()
84 { 84 {
85 if(IsMaster()) { << 85 if (crossSectionHandler) delete crossSectionHandler;
86 for(G4int i=0; i<maxZ; ++i) { << 86 if (formFactorData) delete formFactorData;
87 if(dataCS[i]) { <<
88 delete dataCS[i]; <<
89 dataCS[i] = nullptr; <<
90 delete formFactorData[i]; <<
91 formFactorData[i] = nullptr; <<
92 } <<
93 } <<
94 } <<
95 } 87 }
96 88
97 //....oooOO0OOooo........oooOO0OOooo........oo 89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
98 90
99 void G4LivermorePolarizedRayleighModel::Initia 91 void G4LivermorePolarizedRayleighModel::Initialise(const G4ParticleDefinition* particle,
100 const G 92 const G4DataVector& cuts)
101 { 93 {
102 // Rayleigh process: Th << 94 // Rayleigh process: The Quantum Theory of Radiation
103 // W. << 95 // W. Heitler, Oxford at the Clarendon Press, Oxford (1954)
104 // Scattering function: A << 96 // Scattering function: A simple model of photon transport
105 // D. << 97 // D.E. Cullen, Nucl. Instr. Meth. in Phys. Res. B 101 (1995) 499-510
106 // Polarization of the outcoming photon: Be << 98 // Polarization of the outcoming photon: Beam test of a prototype detector array for the PoGO astronomical hard X-ray/soft gamma-ray polarimeter
107 // X- << 99 // T. Mizuno et al., Nucl. Instr. Meth. in Phys. Res. A 540 (2005) 158-168
108 // T. << 100
109 if (verboseLevel > 3) 101 if (verboseLevel > 3)
110 G4cout << "Calling G4LivermorePolarizedRay 102 G4cout << "Calling G4LivermorePolarizedRayleighModel::Initialise()" << G4endl;
111 103
112 if(IsMaster()) { << 104 if (crossSectionHandler)
113 << 105 {
114 // Initialise element selector << 106 crossSectionHandler->Clear();
115 InitialiseElementSelectors(particle, cuts) << 107 delete crossSectionHandler;
116 <<
117 // Access to elements <<
118 const char* path = G4FindDataDir("G4LEDATA <<
119 auto elmTable = G4Element::GetElementTable <<
120 for (auto const & elm : *elmTable) { <<
121 G4int Z = std::min(elm->GetZasInt(), max <<
122 if( nullptr == dataCS[Z] ) { ReadData(Z, <<
123 } <<
124 } 108 }
125 109
126 if(isInitialised) { return; } << 110 // Read data files for all materials
127 fParticleChange = GetParticleChangeForGamma( <<
128 isInitialised = true; <<
129 } <<
130 111
>> 112 crossSectionHandler = new G4CrossSectionHandler;
>> 113 crossSectionHandler->Clear();
>> 114 G4String crossSectionFile = "rayl/re-cs-";
>> 115 crossSectionHandler->LoadData(crossSectionFile);
131 116
132 //....oooOO0OOooo........oooOO0OOooo........oo << 117 G4VDataSetAlgorithm* ffInterpolation = new G4LogLogInterpolation;
>> 118 G4String formFactorFile = "rayl/re-ff-";
>> 119 formFactorData = new G4CompositeEMDataSet(ffInterpolation,1.,1.);
>> 120 formFactorData->LoadData(formFactorFile);
133 121
134 void G4LivermorePolarizedRayleighModel::Initia << 122 InitialiseElementSelectors(particle,cuts);
135 const G4ParticleDefinition*, G <<
136 { <<
137 SetElementSelectors(masterModel->GetElementS <<
138 } <<
139 123
140 //....oooOO0OOooo........oooOO0OOooo........oo << 124 //
>> 125 if (verboseLevel > 2)
>> 126 G4cout << "Loaded cross section files for Livermore Polarized Rayleigh model" << G4endl;
141 127
142 void G4LivermorePolarizedRayleighModel::ReadDa << 128 InitialiseElementSelectors(particle,cuts);
143 { <<
144 if (verboseLevel > 1) { <<
145 G4cout << "Calling ReadData() of G4Livermo <<
146 << G4endl; <<
147 } <<
148 <<
149 if(nullptr != dataCS[Z]) { return; } <<
150 <<
151 const char* datadir = path; <<
152 <<
153 if(nullptr == datadir) <<
154 { <<
155 datadir = G4FindDataDir("G4LEDATA"); <<
156 if(nullptr == datadir) <<
157 { <<
158 G4Exception("G4LivermoreRayleighModelModel <<
159 FatalException, <<
160 "Environment variable G4LEDATA not d <<
161 return; <<
162 } <<
163 } <<
164 dataCS[Z] = new G4PhysicsFreeVector(); <<
165 formFactorData[Z] = new G4PhysicsFreeVector( <<
166 <<
167 std::ostringstream ostCS; <<
168 ostCS << datadir << "/livermore/rayl/re-cs-" <<
169 std::ifstream finCS(ostCS.str().c_str()); <<
170 <<
171 if( !finCS .is_open() ) { <<
172 G4ExceptionDescription ed; <<
173 ed << "G4LivermorePolarizedRayleighModel d <<
174 << "> is not opened!" << G4endl; <<
175 G4Exception("G4LivermorePolarizedRayleighM <<
176 FatalException, <<
177 ed,"G4LEDATA version should be G4EMLOW8.0 <<
178 return; <<
179 } else { <<
180 if(verboseLevel > 3) { <<
181 G4cout << "File " << ostCS.str() <<
182 << " is opened by G4LivermoreRayleighMo <<
183 } <<
184 dataCS[Z]->Retrieve(finCS, true); <<
185 } <<
186 129
187 std::ostringstream ostFF; << 130 if (verboseLevel > 0) {
188 ostFF << datadir << "/livermore/rayl/re-ff-" << 131 G4cout << "Livermore Polarized Rayleigh model is initialized " << G4endl
189 std::ifstream finFF(ostFF.str().c_str()); << 132 << "Energy range: "
190 << 133 << LowEnergyLimit() / eV << " eV - "
191 if( !finFF.is_open() ) { << 134 << HighEnergyLimit() / GeV << " GeV"
192 G4ExceptionDescription ed; << 135 << G4endl;
193 ed << "G4LivermorePolarizedRayleighModel d << 136 }
194 << "> is not opened!" << G4endl; << 137
195 G4Exception("G4LivermorePolarizedRayleighM << 138 if(isInitialised) return;
196 FatalException, << 139 fParticleChange = GetParticleChangeForGamma();
197 ed,"G4LEDATA version should be G4EMLOW8.0 << 140 isInitialised = true;
198 return; <<
199 } else { <<
200 if(verboseLevel > 3) { <<
201 G4cout << "File " << ostFF.str() <<
202 << " is opened by G4LivermoreRa <<
203 } <<
204 formFactorData[Z]->Retrieve(finFF, true); <<
205 } <<
206 } 141 }
207 << 142
208 //....oooOO0OOooo........oooOO0OOooo........oo 143 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
209 << 144
210 G4double G4LivermorePolarizedRayleighModel::Co 145 G4double G4LivermorePolarizedRayleighModel::ComputeCrossSectionPerAtom(
211 const << 146 const G4ParticleDefinition*,
212 G4double GammaEnergy, << 147 G4double GammaEnergy,
213 G4double Z, G4double, << 148 G4double Z, G4double,
214 G4double, G4double) << 149 G4double, G4double)
215 { 150 {
216 if (verboseLevel > 1) { << 151 if (verboseLevel > 3)
217 G4cout << "G4LivermoreRayleighModel::Compu << 152 G4cout << "Calling CrossSectionPerAtom() of G4LivermorePolarizedRayleighModel" << G4endl;
218 << G4endl; << 153
219 } << 154 if (GammaEnergy < lowEnergyLimit || GammaEnergy > highEnergyLimit) return 0.0;
220 << 155
221 if(GammaEnergy < lowEnergyLimit) { return 0. << 156 G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy);
222 << 157 return cs;
223 G4double xs = 0.0; <<
224 <<
225 G4int intZ = G4lrint(Z); <<
226 if(intZ < 1 || intZ > maxZ) { return xs; } <<
227 <<
228 G4PhysicsFreeVector* pv = dataCS[intZ]; <<
229 <<
230 // if element was not initialised <<
231 // do initialisation safely for MT mode <<
232 if(nullptr == pv) { <<
233 InitialiseForElement(0, intZ); <<
234 pv = dataCS[intZ]; <<
235 if(nullptr == pv) { return xs; } <<
236 } <<
237 <<
238 G4int n = G4int(pv->GetVectorLength() - 1); <<
239 G4double e = GammaEnergy/MeV; <<
240 if(e >= pv->Energy(n)) { <<
241 xs = (*pv)[n]/(e*e); <<
242 } else if(e >= pv->Energy(0)) { <<
243 xs = pv->Value(e)/(e*e); <<
244 } <<
245 return xs; <<
246 } 158 }
247 159
248 //....oooOO0OOooo........oooOO0OOooo........oo 160 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
249 161
250 void G4LivermorePolarizedRayleighModel::Sample << 162 void G4LivermorePolarizedRayleighModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
251 std::vector<G4DynamicParticle* << 163 const G4MaterialCutsCouple* couple,
252 const G4MaterialCutsCouple* couple, << 164 const G4DynamicParticle* aDynamicGamma,
253 const G4DynamicParticle* aDynamicGamma, << 165 G4double,
254 G4double, G4double) << 166 G4double)
255 { 167 {
256 if (verboseLevel > 3) 168 if (verboseLevel > 3)
257 G4cout << "Calling SampleSecondaries() of 169 G4cout << "Calling SampleSecondaries() of G4LivermorePolarizedRayleighModel" << G4endl;
258 170
259 G4double photonEnergy0 = aDynamicGamma->GetK 171 G4double photonEnergy0 = aDynamicGamma->GetKineticEnergy();
260 172
261 if (photonEnergy0 <= lowEnergyLimit) 173 if (photonEnergy0 <= lowEnergyLimit)
262 { 174 {
263 fParticleChange->ProposeTrackStatus(fStopA << 175 fParticleChange->ProposeTrackStatus(fStopAndKill);
264 fParticleChange->SetProposedKineticEnergy( << 176 fParticleChange->SetProposedKineticEnergy(0.);
265 fParticleChange->ProposeLocalEnergyDeposit << 177 fParticleChange->ProposeLocalEnergyDeposit(photonEnergy0);
266 return; << 178 return ;
267 } 179 }
268 180
269 G4ParticleMomentum photonDirection0 = aDynam 181 G4ParticleMomentum photonDirection0 = aDynamicGamma->GetMomentumDirection();
270 182
271 // Select randomly one element in the curren 183 // Select randomly one element in the current material
>> 184 // G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy0);
272 const G4ParticleDefinition* particle = aDyn 185 const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition();
273 const G4Element* elm = SelectRandomAtom(coup 186 const G4Element* elm = SelectRandomAtom(couple,particle,photonEnergy0);
274 G4int Z = elm->GetZasInt(); << 187 G4int Z = (G4int)elm->GetZ();
275 188
276 G4double outcomingPhotonCosTheta = GenerateC 189 G4double outcomingPhotonCosTheta = GenerateCosTheta(photonEnergy0, Z);
277 G4double outcomingPhotonPhi = GeneratePhi(ou 190 G4double outcomingPhotonPhi = GeneratePhi(outcomingPhotonCosTheta);
278 G4double beta = GeneratePolarizationAngle(); << 191 G4double beta=GeneratePolarizationAngle();
279 192
280 // incomingPhoton reference frame: 193 // incomingPhoton reference frame:
281 // z = versor parallel to the incomingPhoton 194 // z = versor parallel to the incomingPhotonDirection
282 // x = versor parallel to the incomingPhoton 195 // x = versor parallel to the incomingPhotonPolarization
283 // y = defined as z^x 196 // y = defined as z^x
284 197
285 // outgoingPhoton reference frame: 198 // outgoingPhoton reference frame:
286 // z' = versor parallel to the outgoingPhoto 199 // z' = versor parallel to the outgoingPhotonDirection
287 // x' = defined as x-x*z'z' normalized 200 // x' = defined as x-x*z'z' normalized
288 // y' = defined as z'^x' << 201 // y' = defined as z'^x'
>> 202
289 G4ThreeVector z(aDynamicGamma->GetMomentumDi 203 G4ThreeVector z(aDynamicGamma->GetMomentumDirection().unit());
290 G4ThreeVector x(GetPhotonPolarization(*aDyna 204 G4ThreeVector x(GetPhotonPolarization(*aDynamicGamma));
291 G4ThreeVector y(z.cross(x)); 205 G4ThreeVector y(z.cross(x));
292 206
293 // z' = std::cos(phi)*std::sin(theta) << 207 // z' = std::cos(phi)*std::sin(theta) x + std::sin(phi)*std::sin(theta) y + std::cos(theta) z
294 // x + std::sin(phi)*std::sin(theta) y + std <<
295 G4double xDir; 208 G4double xDir;
296 G4double yDir; 209 G4double yDir;
297 G4double zDir; 210 G4double zDir;
298 zDir=outcomingPhotonCosTheta; 211 zDir=outcomingPhotonCosTheta;
299 xDir=std::sqrt(1-outcomingPhotonCosTheta*out 212 xDir=std::sqrt(1-outcomingPhotonCosTheta*outcomingPhotonCosTheta);
300 yDir=xDir; 213 yDir=xDir;
301 xDir*=std::cos(outcomingPhotonPhi); 214 xDir*=std::cos(outcomingPhotonPhi);
302 yDir*=std::sin(outcomingPhotonPhi); 215 yDir*=std::sin(outcomingPhotonPhi);
303 216
304 G4ThreeVector zPrime((xDir*x + yDir*y + zDir 217 G4ThreeVector zPrime((xDir*x + yDir*y + zDir*z).unit());
305 G4ThreeVector xPrime(x.perpPart(zPrime).unit 218 G4ThreeVector xPrime(x.perpPart(zPrime).unit());
306 G4ThreeVector yPrime(zPrime.cross(xPrime)); 219 G4ThreeVector yPrime(zPrime.cross(xPrime));
307 220
308 // outgoingPhotonPolarization is directed as << 221 // outgoingPhotonPolarization is directed as x' std::cos(beta) + y' std::sin(beta)
309 // x' std::cos(beta) + y' std::sin(beta) <<
310 G4ThreeVector outcomingPhotonPolarization(xP 222 G4ThreeVector outcomingPhotonPolarization(xPrime*std::cos(beta) + yPrime*std::sin(beta));
311 223
312 fParticleChange->ProposeMomentumDirection(zP 224 fParticleChange->ProposeMomentumDirection(zPrime);
313 fParticleChange->ProposePolarization(outcomi 225 fParticleChange->ProposePolarization(outcomingPhotonPolarization);
314 fParticleChange->SetProposedKineticEnergy(ph 226 fParticleChange->SetProposedKineticEnergy(photonEnergy0);
>> 227
315 } 228 }
316 229
317 //....oooOO0OOooo........oooOO0OOooo........oo 230 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
318 231
319 G4double G4LivermorePolarizedRayleighModel::Ge << 232 G4double G4LivermorePolarizedRayleighModel::GenerateCosTheta(G4double incomingPhotonEnergy, G4int zAtom) const
320 { 233 {
321 // d sigma 234 // d sigma k0
322 // --------- = r0^2 * pi * F^2(x, Z) * ( 2 235 // --------- = r0^2 * pi * F^2(x, Z) * ( 2 - sin^2 theta) * std::sin (theta), x = ---- std::sin(theta/2)
323 // d theta 236 // d theta hc
324 237
325 // d sigma 238 // d sigma k0 1 - y
326 // --------- = r0^2 * pi * F^2(x, Z) * ( 1 + 239 // --------- = r0^2 * pi * F^2(x, Z) * ( 1 + y^2), x = ---- std::sqrt ( ------- ), y = std::cos(theta)
327 // d y 240 // d y hc 2
328 241
329 // Z 242 // Z
330 // F(x, Z) ~ -------- 243 // F(x, Z) ~ --------
331 // a + bx 244 // a + bx
332 // 245 //
333 // The time to exit from the outer loop grow 246 // The time to exit from the outer loop grows as ~ k0
334 // On pcgeant2 the time is ~ 1 s for k0 ~ 1 247 // On pcgeant2 the time is ~ 1 s for k0 ~ 1 MeV on the oxygen element. A 100 GeV
335 // event will take ~ 10 hours. 248 // event will take ~ 10 hours.
336 // 249 //
337 // On the avarage the inner loop does 1.5 it 250 // On the avarage the inner loop does 1.5 iterations before exiting
338 const G4double xxfact = CLHEP::cm/(CLHEP::h_ << 251
339 const G4double xFactor = incomingPhotonEnerg << 252 const G4double xFactor = (incomingPhotonEnergy*cm)/(h_Planck*c_light);
>> 253 //const G4VEMDataSet * formFactorData = GetScatterFunctionData();
340 254
341 G4double cosTheta; 255 G4double cosTheta;
342 G4double fCosTheta; 256 G4double fCosTheta;
343 G4double x; 257 G4double x;
344 G4double fValue; 258 G4double fValue;
345 259
346 if (incomingPhotonEnergy > 5.*CLHEP::MeV) << 260 if (incomingPhotonEnergy > 5.*MeV)
347 { 261 {
348 cosTheta = 1.; 262 cosTheta = 1.;
349 } 263 }
350 else 264 else
351 { 265 {
352 do 266 do
353 { 267 {
354 do 268 do
355 { 269 {
356 cosTheta = 2.*G4UniformRand()-1.; 270 cosTheta = 2.*G4UniformRand()-1.;
357 fCosTheta = (1.+cosTheta*cosTheta)/2.; 271 fCosTheta = (1.+cosTheta*cosTheta)/2.;
358 } 272 }
359 while (fCosTheta < G4UniformRand()); 273 while (fCosTheta < G4UniformRand());
360 274
361 x = xFactor*std::sqrt((1.-cosTheta)/2.); 275 x = xFactor*std::sqrt((1.-cosTheta)/2.);
362 276
363 if (x > 1.e+005) 277 if (x > 1.e+005)
364 fValue = formFactorData[Z]->Value(x); << 278 fValue = formFactorData->FindValue(x, zAtom-1);
365 else 279 else
366 fValue = formFactorData[Z]->Value(0.); << 280 fValue = formFactorData->FindValue(0., zAtom-1);
367 281
368 fValue /= Z; << 282 fValue/=zAtom;
369 fValue *= fValue; << 283 fValue*=fValue;
370 } 284 }
371 while(fValue < G4UniformRand()); 285 while(fValue < G4UniformRand());
372 } 286 }
373 287
374 return cosTheta; 288 return cosTheta;
375 } 289 }
376 290
377 //....oooOO0OOooo........oooOO0OOooo........oo 291 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
378 292
379 G4double G4LivermorePolarizedRayleighModel::Ge 293 G4double G4LivermorePolarizedRayleighModel::GeneratePhi(G4double cosTheta) const
380 { 294 {
381 // d sigma 295 // d sigma
382 // --------- = alpha * ( 1 - sin^2 (theta) * 296 // --------- = alpha * ( 1 - sin^2 (theta) * cos^2 (phi) )
383 // d phi 297 // d phi
384 298
385 // On the average the loop takes no more tha 299 // On the average the loop takes no more than 2 iterations before exiting
386 300
387 G4double phi; 301 G4double phi;
388 G4double cosPhi; 302 G4double cosPhi;
389 G4double phiProbability; 303 G4double phiProbability;
390 G4double sin2Theta; 304 G4double sin2Theta;
391 305
392 sin2Theta=1.-cosTheta*cosTheta; 306 sin2Theta=1.-cosTheta*cosTheta;
393 307
394 do 308 do
395 { 309 {
396 phi = CLHEP::twopi * G4UniformRand(); << 310 phi = twopi * G4UniformRand();
397 cosPhi = std::cos(phi); 311 cosPhi = std::cos(phi);
398 phiProbability= 1. - sin2Theta*cosPhi*co 312 phiProbability= 1. - sin2Theta*cosPhi*cosPhi;
399 } 313 }
400 while (phiProbability < G4UniformRand()); 314 while (phiProbability < G4UniformRand());
401 315
402 return phi; 316 return phi;
403 } 317 }
404 318
405 //....oooOO0OOooo........oooOO0OOooo........oo 319 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
406 320
407 G4double G4LivermorePolarizedRayleighModel::Ge 321 G4double G4LivermorePolarizedRayleighModel::GeneratePolarizationAngle(void) const
408 { 322 {
409 // Rayleigh polarization is always on the x' 323 // Rayleigh polarization is always on the x' direction
>> 324
410 return 0; 325 return 0;
411 } 326 }
412 327
413 //....oooOO0OOooo........oooOO0OOooo........oo 328 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
414 329
415 G4ThreeVector G4LivermorePolarizedRayleighMode 330 G4ThreeVector G4LivermorePolarizedRayleighModel::GetPhotonPolarization(const G4DynamicParticle& photon)
416 { 331 {
417 // From G4VLowEnergyDiscretePhotonProcess.cc << 332
>> 333 // SI - From G4VLowEnergyDiscretePhotonProcess.cc
>> 334
418 G4ThreeVector photonMomentumDirection; 335 G4ThreeVector photonMomentumDirection;
419 G4ThreeVector photonPolarization; 336 G4ThreeVector photonPolarization;
420 337
421 photonPolarization = photon.GetPolarization( 338 photonPolarization = photon.GetPolarization();
422 photonMomentumDirection = photon.GetMomentum 339 photonMomentumDirection = photon.GetMomentumDirection();
423 340
424 if ((!photonPolarization.isOrthogonal(photon 341 if ((!photonPolarization.isOrthogonal(photonMomentumDirection, 1e-6)) || photonPolarization.mag()==0.)
425 { 342 {
426 // if |photonPolarization|==0. or |photo 343 // if |photonPolarization|==0. or |photonPolarization * photonDirection0| > 1e-6 * |photonPolarization ^ photonDirection0|
427 // then polarization is choosen randomly << 344 // then polarization is choosen randomly.
>> 345
428 G4ThreeVector e1(photonMomentumDirection 346 G4ThreeVector e1(photonMomentumDirection.orthogonal().unit());
429 G4ThreeVector e2(photonMomentumDirection 347 G4ThreeVector e2(photonMomentumDirection.cross(e1).unit());
430 348
431 G4double angle(G4UniformRand() * CLHEP:: << 349 G4double angle(G4UniformRand() * twopi);
432 350
433 e1*=std::cos(angle); 351 e1*=std::cos(angle);
434 e2*=std::sin(angle); 352 e2*=std::sin(angle);
435 353
436 photonPolarization=e1+e2; 354 photonPolarization=e1+e2;
437 } 355 }
438 else if (photonPolarization.howOrthogonal(ph 356 else if (photonPolarization.howOrthogonal(photonMomentumDirection) != 0.)
439 { 357 {
440 // if |photonPolarization * photonDirect 358 // if |photonPolarization * photonDirection0| != 0.
441 // then polarization is made orthonormal << 359 // then polarization is made orthonormal;
>> 360
442 photonPolarization=photonPolarization.pe 361 photonPolarization=photonPolarization.perpPart(photonMomentumDirection);
443 } 362 }
444 363
445 return photonPolarization.unit(); 364 return photonPolarization.unit();
446 } 365 }
447 366
448 //....oooOO0OOooo........oooOO0OOooo........oo <<
449 <<
450 void G4LivermorePolarizedRayleighModel::Initia <<
451 const G4ParticleDefinition*, G <<
452 { <<
453 G4AutoLock l(&LivermorePolarizedRayleighMode <<
454 if(nullptr == dataCS[Z]) { ReadData(Z); } <<
455 l.unlock(); <<
456 } <<
457 367