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>> 26 // $Id: G4LivermorePolarizedRayleighModel.cc,v 1.5 2009-05-02 15:20:53 sincerti Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
26 // 28 //
27 // Author: Sebastien Incerti 29 // Author: Sebastien Incerti
28 // 30 October 2008 30 // 30 October 2008
29 // on base of G4LowEnergyPolarizedRayl 31 // on base of G4LowEnergyPolarizedRayleigh developed by R. Capra
30 // 32 //
31 // History: 33 // History:
32 // -------- 34 // --------
33 // 02 May 2009 S Incerti as V. Ivanchenko pr 35 // 02 May 2009 S Incerti as V. Ivanchenko proposed in G4LivermoreRayleighModel.cc
34 // 36 //
35 // Cleanup initialisation and generation of se 37 // Cleanup initialisation and generation of secondaries:
36 // - apply internal high-ener 38 // - apply internal high-energy limit only in constructor
37 // - do not apply low-energy 39 // - do not apply low-energy limit (default is 0)
38 // - remove GetMeanFreePath m 40 // - remove GetMeanFreePath method and table
39 // - remove initialisation of 41 // - remove initialisation of element selector
40 // - use G4ElementSelector 42 // - use G4ElementSelector
41 43
42 #include "G4LivermorePolarizedRayleighModel.hh 44 #include "G4LivermorePolarizedRayleighModel.hh"
43 #include "G4PhysicalConstants.hh" <<
44 #include "G4SystemOfUnits.hh" <<
45 #include "G4LogLogInterpolation.hh" <<
46 #include "G4CompositeEMDataSet.hh" <<
47 #include "G4AutoLock.hh" <<
48 45
49 //....oooOO0OOooo........oooOO0OOooo........oo 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 47
51 using namespace std; 48 using namespace std;
52 namespace { G4Mutex LivermorePolarizedRayleigh <<
53 49
54 //....oooOO0OOooo........oooOO0OOooo........oo 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
55 51
56 G4PhysicsFreeVector* G4LivermorePolarizedRayle <<
57 G4PhysicsFreeVector* G4LivermorePolarizedRayle <<
58 <<
59 G4LivermorePolarizedRayleighModel::G4Livermore 52 G4LivermorePolarizedRayleighModel::G4LivermorePolarizedRayleighModel(const G4ParticleDefinition*,
60 const G4String& nam) << 53 const G4String& nam)
61 :G4VEmModel(nam),fParticleChange(nullptr),is << 54 :G4VEmModel(nam),fParticleChange(0),isInitialised(false),
>> 55 crossSectionHandler(0),formFactorData(0)
62 { 56 {
63 lowEnergyLimit = 250 * CLHEP::eV; << 57 lowEnergyLimit = 250 * eV;
>> 58 highEnergyLimit = 100 * GeV;
>> 59
>> 60 //SetLowEnergyLimit(lowEnergyLimit);
>> 61 SetHighEnergyLimit(highEnergyLimit);
64 // 62 //
65 verboseLevel= 0; 63 verboseLevel= 0;
66 // Verbosity scale: 64 // Verbosity scale:
67 // 0 = nothing 65 // 0 = nothing
68 // 1 = warning for energy non-conservation 66 // 1 = warning for energy non-conservation
69 // 2 = details of energy budget 67 // 2 = details of energy budget
70 // 3 = calculation of cross sections, file o 68 // 3 = calculation of cross sections, file openings, sampling of atoms
71 // 4 = entering in methods 69 // 4 = entering in methods
72 70
73 if(verboseLevel > 0) { 71 if(verboseLevel > 0) {
74 G4cout << "Livermore Polarized Rayleigh is 72 G4cout << "Livermore Polarized Rayleigh is constructed " << G4endl
75 << "Energy range: " << LowEnergyLim << 73 << "Energy range: "
76 << HighEnergyLimit() / CLHEP::GeV << " Ge << 74 << lowEnergyLimit / eV << " eV - "
77 << G4endl; << 75 << highEnergyLimit / GeV << " GeV"
>> 76 << G4endl;
78 } 77 }
79 } 78 }
80 79
81 //....oooOO0OOooo........oooOO0OOooo........oo 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
82 81
83 G4LivermorePolarizedRayleighModel::~G4Livermor 82 G4LivermorePolarizedRayleighModel::~G4LivermorePolarizedRayleighModel()
84 { 83 {
85 if(IsMaster()) { << 84 if (crossSectionHandler) delete crossSectionHandler;
86 for(G4int i=0; i<maxZ; ++i) { << 85 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 } 86 }
96 87
97 //....oooOO0OOooo........oooOO0OOooo........oo 88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
98 89
99 void G4LivermorePolarizedRayleighModel::Initia 90 void G4LivermorePolarizedRayleighModel::Initialise(const G4ParticleDefinition* particle,
100 const G 91 const G4DataVector& cuts)
101 { 92 {
102 // Rayleigh process: Th << 93 // Rayleigh process: The Quantum Theory of Radiation
103 // W. << 94 // W. Heitler, Oxford at the Clarendon Press, Oxford (1954)
104 // Scattering function: A << 95 // Scattering function: A simple model of photon transport
105 // D. << 96 // D.E. Cullen, Nucl. Instr. Meth. in Phys. Res. B 101 (1995) 499-510
106 // Polarization of the outcoming photon: Be << 97 // 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- << 98 // T. Mizuno et al., Nucl. Instr. Meth. in Phys. Res. A 540 (2005) 158-168
108 // T. << 99
109 if (verboseLevel > 3) 100 if (verboseLevel > 3)
110 G4cout << "Calling G4LivermorePolarizedRay 101 G4cout << "Calling G4LivermorePolarizedRayleighModel::Initialise()" << G4endl;
111 102
112 if(IsMaster()) { << 103 if (crossSectionHandler)
113 << 104 {
114 // Initialise element selector << 105 crossSectionHandler->Clear();
115 InitialiseElementSelectors(particle, cuts) << 106 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 } 107 }
125 108
126 if(isInitialised) { return; } << 109 // Read data files for all materials
127 fParticleChange = GetParticleChangeForGamma( <<
128 isInitialised = true; <<
129 } <<
130 110
>> 111 crossSectionHandler = new G4CrossSectionHandler;
>> 112 crossSectionHandler->Clear();
>> 113 G4String crossSectionFile = "rayl/re-cs-";
>> 114 crossSectionHandler->LoadData(crossSectionFile);
131 115
132 //....oooOO0OOooo........oooOO0OOooo........oo << 116 G4VDataSetAlgorithm* ffInterpolation = new G4LogLogInterpolation;
>> 117 G4String formFactorFile = "rayl/re-ff-";
>> 118 formFactorData = new G4CompositeEMDataSet(ffInterpolation,1.,1.);
>> 119 formFactorData->LoadData(formFactorFile);
133 120
134 void G4LivermorePolarizedRayleighModel::Initia << 121 InitialiseElementSelectors(particle,cuts);
135 const G4ParticleDefinition*, G <<
136 { <<
137 SetElementSelectors(masterModel->GetElementS <<
138 } <<
139 122
140 //....oooOO0OOooo........oooOO0OOooo........oo << 123 //
>> 124 if (verboseLevel > 2)
>> 125 G4cout << "Loaded cross section files for Livermore Polarized Rayleigh model" << G4endl;
141 126
142 void G4LivermorePolarizedRayleighModel::ReadDa << 127 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 } <<
186 128
187 std::ostringstream ostFF; << 129 if (verboseLevel > 0) {
188 ostFF << datadir << "/livermore/rayl/re-ff-" << 130 G4cout << "Livermore Polarized Rayleigh model is initialized " << G4endl
189 std::ifstream finFF(ostFF.str().c_str()); << 131 << "Energy range: "
190 << 132 << LowEnergyLimit() / eV << " eV - "
191 if( !finFF.is_open() ) { << 133 << HighEnergyLimit() / GeV << " GeV"
192 G4ExceptionDescription ed; << 134 << G4endl;
193 ed << "G4LivermorePolarizedRayleighModel d << 135 }
194 << "> is not opened!" << G4endl; << 136
195 G4Exception("G4LivermorePolarizedRayleighM << 137 if(isInitialised) return;
196 FatalException, << 138 fParticleChange = GetParticleChangeForGamma();
197 ed,"G4LEDATA version should be G4EMLOW8.0 << 139 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 } 140 }
207 << 141
208 //....oooOO0OOooo........oooOO0OOooo........oo 142 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
209 << 143
210 G4double G4LivermorePolarizedRayleighModel::Co 144 G4double G4LivermorePolarizedRayleighModel::ComputeCrossSectionPerAtom(
211 const << 145 const G4ParticleDefinition*,
212 G4double GammaEnergy, << 146 G4double GammaEnergy,
213 G4double Z, G4double, << 147 G4double Z, G4double,
214 G4double, G4double) << 148 G4double, G4double)
215 { 149 {
216 if (verboseLevel > 1) { << 150 if (verboseLevel > 3)
217 G4cout << "G4LivermoreRayleighModel::Compu << 151 G4cout << "Calling CrossSectionPerAtom() of G4LivermorePolarizedRayleighModel" << G4endl;
218 << G4endl; << 152
219 } << 153 if (GammaEnergy < lowEnergyLimit || GammaEnergy > highEnergyLimit) return 0.0;
220 << 154
221 if(GammaEnergy < lowEnergyLimit) { return 0. << 155 G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy);
222 << 156 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 } 157 }
247 158
248 //....oooOO0OOooo........oooOO0OOooo........oo 159 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
249 160
250 void G4LivermorePolarizedRayleighModel::Sample << 161 void G4LivermorePolarizedRayleighModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
251 std::vector<G4DynamicParticle* << 162 const G4MaterialCutsCouple* couple,
252 const G4MaterialCutsCouple* couple, << 163 const G4DynamicParticle* aDynamicGamma,
253 const G4DynamicParticle* aDynamicGamma, << 164 G4double,
254 G4double, G4double) << 165 G4double)
255 { 166 {
256 if (verboseLevel > 3) 167 if (verboseLevel > 3)
257 G4cout << "Calling SampleSecondaries() of 168 G4cout << "Calling SampleSecondaries() of G4LivermorePolarizedRayleighModel" << G4endl;
258 169
259 G4double photonEnergy0 = aDynamicGamma->GetK 170 G4double photonEnergy0 = aDynamicGamma->GetKineticEnergy();
260 171
261 if (photonEnergy0 <= lowEnergyLimit) 172 if (photonEnergy0 <= lowEnergyLimit)
262 { 173 {
263 fParticleChange->ProposeTrackStatus(fStopA << 174 fParticleChange->ProposeTrackStatus(fStopAndKill);
264 fParticleChange->SetProposedKineticEnergy( << 175 fParticleChange->SetProposedKineticEnergy(0.);
265 fParticleChange->ProposeLocalEnergyDeposit << 176 fParticleChange->ProposeLocalEnergyDeposit(photonEnergy0);
266 return; << 177 return ;
267 } 178 }
268 179
269 G4ParticleMomentum photonDirection0 = aDynam 180 G4ParticleMomentum photonDirection0 = aDynamicGamma->GetMomentumDirection();
270 181
271 // Select randomly one element in the curren 182 // Select randomly one element in the current material
>> 183 // G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy0);
272 const G4ParticleDefinition* particle = aDyn 184 const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition();
273 const G4Element* elm = SelectRandomAtom(coup 185 const G4Element* elm = SelectRandomAtom(couple,particle,photonEnergy0);
274 G4int Z = elm->GetZasInt(); << 186 G4int Z = (G4int)elm->GetZ();
275 187
276 G4double outcomingPhotonCosTheta = GenerateC 188 G4double outcomingPhotonCosTheta = GenerateCosTheta(photonEnergy0, Z);
277 G4double outcomingPhotonPhi = GeneratePhi(ou 189 G4double outcomingPhotonPhi = GeneratePhi(outcomingPhotonCosTheta);
278 G4double beta = GeneratePolarizationAngle(); << 190 G4double beta=GeneratePolarizationAngle();
279 191
280 // incomingPhoton reference frame: 192 // incomingPhoton reference frame:
281 // z = versor parallel to the incomingPhoton 193 // z = versor parallel to the incomingPhotonDirection
282 // x = versor parallel to the incomingPhoton 194 // x = versor parallel to the incomingPhotonPolarization
283 // y = defined as z^x 195 // y = defined as z^x
284 196
285 // outgoingPhoton reference frame: 197 // outgoingPhoton reference frame:
286 // z' = versor parallel to the outgoingPhoto 198 // z' = versor parallel to the outgoingPhotonDirection
287 // x' = defined as x-x*z'z' normalized 199 // x' = defined as x-x*z'z' normalized
288 // y' = defined as z'^x' << 200 // y' = defined as z'^x'
>> 201
289 G4ThreeVector z(aDynamicGamma->GetMomentumDi 202 G4ThreeVector z(aDynamicGamma->GetMomentumDirection().unit());
290 G4ThreeVector x(GetPhotonPolarization(*aDyna 203 G4ThreeVector x(GetPhotonPolarization(*aDynamicGamma));
291 G4ThreeVector y(z.cross(x)); 204 G4ThreeVector y(z.cross(x));
292 205
293 // z' = std::cos(phi)*std::sin(theta) << 206 // 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; 207 G4double xDir;
296 G4double yDir; 208 G4double yDir;
297 G4double zDir; 209 G4double zDir;
298 zDir=outcomingPhotonCosTheta; 210 zDir=outcomingPhotonCosTheta;
299 xDir=std::sqrt(1-outcomingPhotonCosTheta*out 211 xDir=std::sqrt(1-outcomingPhotonCosTheta*outcomingPhotonCosTheta);
300 yDir=xDir; 212 yDir=xDir;
301 xDir*=std::cos(outcomingPhotonPhi); 213 xDir*=std::cos(outcomingPhotonPhi);
302 yDir*=std::sin(outcomingPhotonPhi); 214 yDir*=std::sin(outcomingPhotonPhi);
303 215
304 G4ThreeVector zPrime((xDir*x + yDir*y + zDir 216 G4ThreeVector zPrime((xDir*x + yDir*y + zDir*z).unit());
305 G4ThreeVector xPrime(x.perpPart(zPrime).unit 217 G4ThreeVector xPrime(x.perpPart(zPrime).unit());
306 G4ThreeVector yPrime(zPrime.cross(xPrime)); 218 G4ThreeVector yPrime(zPrime.cross(xPrime));
307 219
308 // outgoingPhotonPolarization is directed as << 220 // 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 221 G4ThreeVector outcomingPhotonPolarization(xPrime*std::cos(beta) + yPrime*std::sin(beta));
311 222
312 fParticleChange->ProposeMomentumDirection(zP 223 fParticleChange->ProposeMomentumDirection(zPrime);
313 fParticleChange->ProposePolarization(outcomi 224 fParticleChange->ProposePolarization(outcomingPhotonPolarization);
314 fParticleChange->SetProposedKineticEnergy(ph 225 fParticleChange->SetProposedKineticEnergy(photonEnergy0);
>> 226
315 } 227 }
316 228
317 //....oooOO0OOooo........oooOO0OOooo........oo 229 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
318 230
319 G4double G4LivermorePolarizedRayleighModel::Ge << 231 G4double G4LivermorePolarizedRayleighModel::GenerateCosTheta(G4double incomingPhotonEnergy, G4int zAtom) const
320 { 232 {
321 // d sigma 233 // d sigma k0
322 // --------- = r0^2 * pi * F^2(x, Z) * ( 2 234 // --------- = r0^2 * pi * F^2(x, Z) * ( 2 - sin^2 theta) * std::sin (theta), x = ---- std::sin(theta/2)
323 // d theta 235 // d theta hc
324 236
325 // d sigma 237 // d sigma k0 1 - y
326 // --------- = r0^2 * pi * F^2(x, Z) * ( 1 + 238 // --------- = r0^2 * pi * F^2(x, Z) * ( 1 + y^2), x = ---- std::sqrt ( ------- ), y = std::cos(theta)
327 // d y 239 // d y hc 2
328 240
329 // Z 241 // Z
330 // F(x, Z) ~ -------- 242 // F(x, Z) ~ --------
331 // a + bx 243 // a + bx
332 // 244 //
333 // The time to exit from the outer loop grow 245 // The time to exit from the outer loop grows as ~ k0
334 // On pcgeant2 the time is ~ 1 s for k0 ~ 1 246 // On pcgeant2 the time is ~ 1 s for k0 ~ 1 MeV on the oxygen element. A 100 GeV
335 // event will take ~ 10 hours. 247 // event will take ~ 10 hours.
336 // 248 //
337 // On the avarage the inner loop does 1.5 it 249 // On the avarage the inner loop does 1.5 iterations before exiting
338 const G4double xxfact = CLHEP::cm/(CLHEP::h_ << 250
339 const G4double xFactor = incomingPhotonEnerg << 251 const G4double xFactor = (incomingPhotonEnergy*cm)/(h_Planck*c_light);
>> 252 //const G4VEMDataSet * formFactorData = GetScatterFunctionData();
340 253
341 G4double cosTheta; 254 G4double cosTheta;
342 G4double fCosTheta; 255 G4double fCosTheta;
343 G4double x; 256 G4double x;
344 G4double fValue; 257 G4double fValue;
345 258
346 if (incomingPhotonEnergy > 5.*CLHEP::MeV) << 259 if (incomingPhotonEnergy > 5.*MeV)
347 { 260 {
348 cosTheta = 1.; 261 cosTheta = 1.;
349 } 262 }
350 else 263 else
351 { 264 {
352 do 265 do
353 { 266 {
354 do 267 do
355 { 268 {
356 cosTheta = 2.*G4UniformRand()-1.; 269 cosTheta = 2.*G4UniformRand()-1.;
357 fCosTheta = (1.+cosTheta*cosTheta)/2.; 270 fCosTheta = (1.+cosTheta*cosTheta)/2.;
358 } 271 }
359 while (fCosTheta < G4UniformRand()); 272 while (fCosTheta < G4UniformRand());
360 273
361 x = xFactor*std::sqrt((1.-cosTheta)/2.); 274 x = xFactor*std::sqrt((1.-cosTheta)/2.);
362 275
363 if (x > 1.e+005) 276 if (x > 1.e+005)
364 fValue = formFactorData[Z]->Value(x); << 277 fValue = formFactorData->FindValue(x, zAtom-1);
365 else 278 else
366 fValue = formFactorData[Z]->Value(0.); << 279 fValue = formFactorData->FindValue(0., zAtom-1);
367 280
368 fValue /= Z; << 281 fValue/=zAtom;
369 fValue *= fValue; << 282 fValue*=fValue;
370 } 283 }
371 while(fValue < G4UniformRand()); 284 while(fValue < G4UniformRand());
372 } 285 }
373 286
374 return cosTheta; 287 return cosTheta;
375 } 288 }
376 289
377 //....oooOO0OOooo........oooOO0OOooo........oo 290 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
378 291
379 G4double G4LivermorePolarizedRayleighModel::Ge 292 G4double G4LivermorePolarizedRayleighModel::GeneratePhi(G4double cosTheta) const
380 { 293 {
381 // d sigma 294 // d sigma
382 // --------- = alpha * ( 1 - sin^2 (theta) * 295 // --------- = alpha * ( 1 - sin^2 (theta) * cos^2 (phi) )
383 // d phi 296 // d phi
384 297
385 // On the average the loop takes no more tha 298 // On the average the loop takes no more than 2 iterations before exiting
386 299
387 G4double phi; 300 G4double phi;
388 G4double cosPhi; 301 G4double cosPhi;
389 G4double phiProbability; 302 G4double phiProbability;
390 G4double sin2Theta; 303 G4double sin2Theta;
391 304
392 sin2Theta=1.-cosTheta*cosTheta; 305 sin2Theta=1.-cosTheta*cosTheta;
393 306
394 do 307 do
395 { 308 {
396 phi = CLHEP::twopi * G4UniformRand(); << 309 phi = twopi * G4UniformRand();
397 cosPhi = std::cos(phi); 310 cosPhi = std::cos(phi);
398 phiProbability= 1. - sin2Theta*cosPhi*co 311 phiProbability= 1. - sin2Theta*cosPhi*cosPhi;
399 } 312 }
400 while (phiProbability < G4UniformRand()); 313 while (phiProbability < G4UniformRand());
401 314
402 return phi; 315 return phi;
403 } 316 }
404 317
405 //....oooOO0OOooo........oooOO0OOooo........oo 318 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
406 319
407 G4double G4LivermorePolarizedRayleighModel::Ge 320 G4double G4LivermorePolarizedRayleighModel::GeneratePolarizationAngle(void) const
408 { 321 {
409 // Rayleigh polarization is always on the x' 322 // Rayleigh polarization is always on the x' direction
>> 323
410 return 0; 324 return 0;
411 } 325 }
412 326
413 //....oooOO0OOooo........oooOO0OOooo........oo 327 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
414 328
415 G4ThreeVector G4LivermorePolarizedRayleighMode 329 G4ThreeVector G4LivermorePolarizedRayleighModel::GetPhotonPolarization(const G4DynamicParticle& photon)
416 { 330 {
417 // From G4VLowEnergyDiscretePhotonProcess.cc << 331
>> 332 // SI - From G4VLowEnergyDiscretePhotonProcess.cc
>> 333
418 G4ThreeVector photonMomentumDirection; 334 G4ThreeVector photonMomentumDirection;
419 G4ThreeVector photonPolarization; 335 G4ThreeVector photonPolarization;
420 336
421 photonPolarization = photon.GetPolarization( 337 photonPolarization = photon.GetPolarization();
422 photonMomentumDirection = photon.GetMomentum 338 photonMomentumDirection = photon.GetMomentumDirection();
423 339
424 if ((!photonPolarization.isOrthogonal(photon 340 if ((!photonPolarization.isOrthogonal(photonMomentumDirection, 1e-6)) || photonPolarization.mag()==0.)
425 { 341 {
426 // if |photonPolarization|==0. or |photo 342 // if |photonPolarization|==0. or |photonPolarization * photonDirection0| > 1e-6 * |photonPolarization ^ photonDirection0|
427 // then polarization is choosen randomly << 343 // then polarization is choosen randomly.
>> 344
428 G4ThreeVector e1(photonMomentumDirection 345 G4ThreeVector e1(photonMomentumDirection.orthogonal().unit());
429 G4ThreeVector e2(photonMomentumDirection 346 G4ThreeVector e2(photonMomentumDirection.cross(e1).unit());
430 347
431 G4double angle(G4UniformRand() * CLHEP:: << 348 G4double angle(G4UniformRand() * twopi);
432 349
433 e1*=std::cos(angle); 350 e1*=std::cos(angle);
434 e2*=std::sin(angle); 351 e2*=std::sin(angle);
435 352
436 photonPolarization=e1+e2; 353 photonPolarization=e1+e2;
437 } 354 }
438 else if (photonPolarization.howOrthogonal(ph 355 else if (photonPolarization.howOrthogonal(photonMomentumDirection) != 0.)
439 { 356 {
440 // if |photonPolarization * photonDirect 357 // if |photonPolarization * photonDirection0| != 0.
441 // then polarization is made orthonormal << 358 // then polarization is made orthonormal;
>> 359
442 photonPolarization=photonPolarization.pe 360 photonPolarization=photonPolarization.perpPart(photonMomentumDirection);
443 } 361 }
444 362
445 return photonPolarization.unit(); 363 return photonPolarization.unit();
446 } 364 }
447 365
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 } <<
457 366