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25 //
26 //
27 // Author: Sebastien Incerti
28 // 30 October 2008
29 // on base of G4LowEnergyPolarizedRayl
30 //
31 // History:
32 // --------
33 // 02 May 2009 S Incerti as V. Ivanchenko pr
34 //
35 // Cleanup initialisation and generation of se
36 // - apply internal high-ener
37 // - do not apply low-energy
38 // - remove GetMeanFreePath m
39 // - remove initialisation of
40 // - use G4ElementSelector
41
42 #include "G4LivermorePolarizedRayleighModel.hh
43 #include "G4PhysicalConstants.hh"
44 #include "G4SystemOfUnits.hh"
45 #include "G4LogLogInterpolation.hh"
46 #include "G4CompositeEMDataSet.hh"
47 #include "G4AutoLock.hh"
48
49 //....oooOO0OOooo........oooOO0OOooo........oo
50
51 using namespace std;
52 namespace { G4Mutex LivermorePolarizedRayleigh
53
54 //....oooOO0OOooo........oooOO0OOooo........oo
55
56 G4PhysicsFreeVector* G4LivermorePolarizedRayle
57 G4PhysicsFreeVector* G4LivermorePolarizedRayle
58
59 G4LivermorePolarizedRayleighModel::G4Livermore
60 const G4String& nam)
61 :G4VEmModel(nam),fParticleChange(nullptr),is
62 {
63 lowEnergyLimit = 250 * CLHEP::eV;
64 //
65 verboseLevel= 0;
66 // Verbosity scale:
67 // 0 = nothing
68 // 1 = warning for energy non-conservation
69 // 2 = details of energy budget
70 // 3 = calculation of cross sections, file o
71 // 4 = entering in methods
72
73 if(verboseLevel > 0) {
74 G4cout << "Livermore Polarized Rayleigh is
75 << "Energy range: " << LowEnergyLim
76 << HighEnergyLimit() / CLHEP::GeV << " Ge
77 << G4endl;
78 }
79 }
80
81 //....oooOO0OOooo........oooOO0OOooo........oo
82
83 G4LivermorePolarizedRayleighModel::~G4Livermor
84 {
85 if(IsMaster()) {
86 for(G4int i=0; i<maxZ; ++i) {
87 if(dataCS[i]) {
88 delete dataCS[i];
89 dataCS[i] = nullptr;
90 delete formFactorData[i];
91 formFactorData[i] = nullptr;
92 }
93 }
94 }
95 }
96
97 //....oooOO0OOooo........oooOO0OOooo........oo
98
99 void G4LivermorePolarizedRayleighModel::Initia
100 const G
101 {
102 // Rayleigh process: Th
103 // W.
104 // Scattering function: A
105 // D.
106 // Polarization of the outcoming photon: Be
107 // X-
108 // T.
109 if (verboseLevel > 3)
110 G4cout << "Calling G4LivermorePolarizedRay
111
112 if(IsMaster()) {
113
114 // Initialise element selector
115 InitialiseElementSelectors(particle, cuts)
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 }
125
126 if(isInitialised) { return; }
127 fParticleChange = GetParticleChangeForGamma(
128 isInitialised = true;
129 }
130
131
132 //....oooOO0OOooo........oooOO0OOooo........oo
133
134 void G4LivermorePolarizedRayleighModel::Initia
135 const G4ParticleDefinition*, G
136 {
137 SetElementSelectors(masterModel->GetElementS
138 }
139
140 //....oooOO0OOooo........oooOO0OOooo........oo
141
142 void G4LivermorePolarizedRayleighModel::ReadDa
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
187 std::ostringstream ostFF;
188 ostFF << datadir << "/livermore/rayl/re-ff-"
189 std::ifstream finFF(ostFF.str().c_str());
190
191 if( !finFF.is_open() ) {
192 G4ExceptionDescription ed;
193 ed << "G4LivermorePolarizedRayleighModel d
194 << "> is not opened!" << G4endl;
195 G4Exception("G4LivermorePolarizedRayleighM
196 FatalException,
197 ed,"G4LEDATA version should be G4EMLOW8.0
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 }
207
208 //....oooOO0OOooo........oooOO0OOooo........oo
209
210 G4double G4LivermorePolarizedRayleighModel::Co
211 const
212 G4double GammaEnergy,
213 G4double Z, G4double,
214 G4double, G4double)
215 {
216 if (verboseLevel > 1) {
217 G4cout << "G4LivermoreRayleighModel::Compu
218 << G4endl;
219 }
220
221 if(GammaEnergy < lowEnergyLimit) { return 0.
222
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 }
247
248 //....oooOO0OOooo........oooOO0OOooo........oo
249
250 void G4LivermorePolarizedRayleighModel::Sample
251 std::vector<G4DynamicParticle*
252 const G4MaterialCutsCouple* couple,
253 const G4DynamicParticle* aDynamicGamma,
254 G4double, G4double)
255 {
256 if (verboseLevel > 3)
257 G4cout << "Calling SampleSecondaries() of
258
259 G4double photonEnergy0 = aDynamicGamma->GetK
260
261 if (photonEnergy0 <= lowEnergyLimit)
262 {
263 fParticleChange->ProposeTrackStatus(fStopA
264 fParticleChange->SetProposedKineticEnergy(
265 fParticleChange->ProposeLocalEnergyDeposit
266 return;
267 }
268
269 G4ParticleMomentum photonDirection0 = aDynam
270
271 // Select randomly one element in the curren
272 const G4ParticleDefinition* particle = aDyn
273 const G4Element* elm = SelectRandomAtom(coup
274 G4int Z = elm->GetZasInt();
275
276 G4double outcomingPhotonCosTheta = GenerateC
277 G4double outcomingPhotonPhi = GeneratePhi(ou
278 G4double beta = GeneratePolarizationAngle();
279
280 // incomingPhoton reference frame:
281 // z = versor parallel to the incomingPhoton
282 // x = versor parallel to the incomingPhoton
283 // y = defined as z^x
284
285 // outgoingPhoton reference frame:
286 // z' = versor parallel to the outgoingPhoto
287 // x' = defined as x-x*z'z' normalized
288 // y' = defined as z'^x'
289 G4ThreeVector z(aDynamicGamma->GetMomentumDi
290 G4ThreeVector x(GetPhotonPolarization(*aDyna
291 G4ThreeVector y(z.cross(x));
292
293 // z' = std::cos(phi)*std::sin(theta)
294 // x + std::sin(phi)*std::sin(theta) y + std
295 G4double xDir;
296 G4double yDir;
297 G4double zDir;
298 zDir=outcomingPhotonCosTheta;
299 xDir=std::sqrt(1-outcomingPhotonCosTheta*out
300 yDir=xDir;
301 xDir*=std::cos(outcomingPhotonPhi);
302 yDir*=std::sin(outcomingPhotonPhi);
303
304 G4ThreeVector zPrime((xDir*x + yDir*y + zDir
305 G4ThreeVector xPrime(x.perpPart(zPrime).unit
306 G4ThreeVector yPrime(zPrime.cross(xPrime));
307
308 // outgoingPhotonPolarization is directed as
309 // x' std::cos(beta) + y' std::sin(beta)
310 G4ThreeVector outcomingPhotonPolarization(xP
311
312 fParticleChange->ProposeMomentumDirection(zP
313 fParticleChange->ProposePolarization(outcomi
314 fParticleChange->SetProposedKineticEnergy(ph
315 }
316
317 //....oooOO0OOooo........oooOO0OOooo........oo
318
319 G4double G4LivermorePolarizedRayleighModel::Ge
320 {
321 // d sigma
322 // --------- = r0^2 * pi * F^2(x, Z) * ( 2
323 // d theta
324
325 // d sigma
326 // --------- = r0^2 * pi * F^2(x, Z) * ( 1 +
327 // d y
328
329 // Z
330 // F(x, Z) ~ --------
331 // a + bx
332 //
333 // The time to exit from the outer loop grow
334 // On pcgeant2 the time is ~ 1 s for k0 ~ 1
335 // event will take ~ 10 hours.
336 //
337 // On the avarage the inner loop does 1.5 it
338 const G4double xxfact = CLHEP::cm/(CLHEP::h_
339 const G4double xFactor = incomingPhotonEnerg
340
341 G4double cosTheta;
342 G4double fCosTheta;
343 G4double x;
344 G4double fValue;
345
346 if (incomingPhotonEnergy > 5.*CLHEP::MeV)
347 {
348 cosTheta = 1.;
349 }
350 else
351 {
352 do
353 {
354 do
355 {
356 cosTheta = 2.*G4UniformRand()-1.;
357 fCosTheta = (1.+cosTheta*cosTheta)/2.;
358 }
359 while (fCosTheta < G4UniformRand());
360
361 x = xFactor*std::sqrt((1.-cosTheta)/2.);
362
363 if (x > 1.e+005)
364 fValue = formFactorData[Z]->Value(x);
365 else
366 fValue = formFactorData[Z]->Value(0.);
367
368 fValue /= Z;
369 fValue *= fValue;
370 }
371 while(fValue < G4UniformRand());
372 }
373
374 return cosTheta;
375 }
376
377 //....oooOO0OOooo........oooOO0OOooo........oo
378
379 G4double G4LivermorePolarizedRayleighModel::Ge
380 {
381 // d sigma
382 // --------- = alpha * ( 1 - sin^2 (theta) *
383 // d phi
384
385 // On the average the loop takes no more tha
386
387 G4double phi;
388 G4double cosPhi;
389 G4double phiProbability;
390 G4double sin2Theta;
391
392 sin2Theta=1.-cosTheta*cosTheta;
393
394 do
395 {
396 phi = CLHEP::twopi * G4UniformRand();
397 cosPhi = std::cos(phi);
398 phiProbability= 1. - sin2Theta*cosPhi*co
399 }
400 while (phiProbability < G4UniformRand());
401
402 return phi;
403 }
404
405 //....oooOO0OOooo........oooOO0OOooo........oo
406
407 G4double G4LivermorePolarizedRayleighModel::Ge
408 {
409 // Rayleigh polarization is always on the x'
410 return 0;
411 }
412
413 //....oooOO0OOooo........oooOO0OOooo........oo
414
415 G4ThreeVector G4LivermorePolarizedRayleighMode
416 {
417 // From G4VLowEnergyDiscretePhotonProcess.cc
418 G4ThreeVector photonMomentumDirection;
419 G4ThreeVector photonPolarization;
420
421 photonPolarization = photon.GetPolarization(
422 photonMomentumDirection = photon.GetMomentum
423
424 if ((!photonPolarization.isOrthogonal(photon
425 {
426 // if |photonPolarization|==0. or |photo
427 // then polarization is choosen randomly
428 G4ThreeVector e1(photonMomentumDirection
429 G4ThreeVector e2(photonMomentumDirection
430
431 G4double angle(G4UniformRand() * CLHEP::
432
433 e1*=std::cos(angle);
434 e2*=std::sin(angle);
435
436 photonPolarization=e1+e2;
437 }
438 else if (photonPolarization.howOrthogonal(ph
439 {
440 // if |photonPolarization * photonDirect
441 // then polarization is made orthonormal
442 photonPolarization=photonPolarization.pe
443 }
444
445 return photonPolarization.unit();
446 }
447
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