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26 //
27 // G4MicroElecInelasticModel.cc, 2011/08/29 A.Valentin, M. Raine
28 //
29 // Based on the following publications
30 //
31 // - Inelastic cross-sections of low energy electrons in silicon
32 // for the simulation of heavy ion tracks with theGeant4-DNA toolkit,
33 // NSS Conf. Record 2010, pp. 80-85.
34 // - Geant4 physics processes for microdosimetry simulation:
35 // very low energy electromagnetic models for electrons in Si,
36 // NIM B, vol. 288, pp. 66 - 73, 2012.
37 // - Geant4 physics processes for microdosimetry simulation:
38 // very low energy electromagnetic models for protons and
39 // heavy ions in Si, NIM B, vol. 287, pp. 124 - 129, 2012.
40 //
41 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
42
43 #include "G4MicroElecInelasticModel.hh"
44
45 #include "globals.hh"
46 #include "G4PhysicalConstants.hh"
47 #include "G4SystemOfUnits.hh"
48 #include "G4ios.hh"
49 #include "G4UnitsTable.hh"
50 #include "G4UAtomicDeexcitation.hh"
51 #include "G4MicroElecSiStructure.hh"
52 #include "G4LossTableManager.hh"
53 #include "G4ionEffectiveCharge.hh"
54 #include "G4MicroElecCrossSectionDataSet.hh"
55 #include "G4Electron.hh"
56 #include "G4Proton.hh"
57 #include "G4GenericIon.hh"
58 #include "G4ParticleDefinition.hh"
59 #include "G4NistManager.hh"
60 #include "G4LogLogInterpolation.hh"
61 #include "G4DeltaAngle.hh"
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64
65 using namespace std;
66
67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
68
69 G4MicroElecInelasticModel::G4MicroElecInelasticModel(const G4ParticleDefinition*,
70 const G4String& nam)
71 :G4VEmModel(nam),isInitialised(false)
72 {
73 nistSi = G4NistManager::Instance()->FindOrBuildMaterial("G4_Si");
74
75 verboseLevel= 0;
76 // Verbosity scale:
77 // 0 = nothing
78 // 1 = warning for energy non-conservation
79 // 2 = details of energy budget
80 // 3 = calculation of cross sections, file openings, sampling of atoms
81 // 4 = entering in methods
82
83 if( verboseLevel>0 )
84 {
85 G4cout << "MicroElec inelastic model is constructed " << G4endl;
86 }
87
88 //Mark this model as "applicable" for atomic deexcitation
89 SetDeexcitationFlag(true);
90 fAtomDeexcitation = nullptr;
91 fParticleChangeForGamma = nullptr;
92
93 // default generator
94 SetAngularDistribution(new G4DeltaAngle());
95
96 // Selection of computation method
97 fasterCode = true; //false;
98 }
99
100 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
101
102 G4MicroElecInelasticModel::~G4MicroElecInelasticModel()
103 {
104 // Cross section
105 for (auto & pos : tableData)
106 {
107 G4MicroElecCrossSectionDataSet* table = pos.second;
108 delete table;
109 }
110
111 // Final state
112 eVecm.clear();
113 pVecm.clear();
114
115 }
116
117 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
118
119 void G4MicroElecInelasticModel::Initialise(const G4ParticleDefinition* particle,
120 const G4DataVector& /*cuts*/)
121 {
122
123 if (verboseLevel > 3)
124 G4cout << "Calling G4MicroElecInelasticModel::Initialise()" << G4endl;
125
126 // Energy limits
127
128 G4String fileElectron("microelec/sigma_inelastic_e_Si");
129 G4String fileProton("microelec/sigma_inelastic_p_Si");
130
131 G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
132 G4ParticleDefinition* protonDef = G4Proton::ProtonDefinition();
133 G4String electron = electronDef->GetParticleName();
134 G4String proton = protonDef->GetParticleName();;
135
136 G4double scaleFactor = 1e-18 * cm *cm;
137
138 const char* path = G4FindDataDir("G4LEDATA");
139
140 // *** ELECTRON
141 tableFile[electron] = fileElectron;
142 lowEnergyLimit[electron] = 16.7 * eV;
143 highEnergyLimit[electron] = 100.0 * MeV;
144
145 // Cross section
146 G4MicroElecCrossSectionDataSet* tableE = new G4MicroElecCrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
147 tableE->LoadData(fileElectron);
148
149 tableData[electron] = tableE;
150
151 // Final state
152
153 std::ostringstream eFullFileName;
154
155 if (fasterCode) eFullFileName << path << "/microelec/sigmadiff_cumulated_inelastic_e_Si.dat";
156 else eFullFileName << path << "/microelec/sigmadiff_inelastic_e_Si.dat";
157
158 std::ifstream eDiffCrossSection(eFullFileName.str().c_str());
159
160 if (!eDiffCrossSection)
161 {
162 if (fasterCode) G4Exception("G4MicroElecInelasticModel::Initialise","em0003",
163 FatalException,"Missing data file:/microelec/sigmadiff_cumulated_inelastic_e_Si.dat");
164
165 else G4Exception("G4MicroElecInelasticModel::Initialise","em0003",
166 FatalException,"Missing data file:/microelec/sigmadiff_inelastic_e_Si.dat");
167 }
168
169 // Clear the arrays for re-initialization case (MT mode)
170 // Octobre 22nd, 2014 - Melanie Raine
171 eTdummyVec.clear();
172 pTdummyVec.clear();
173
174 eVecm.clear();
175 pVecm.clear();
176
177 for (int j=0; j<6; j++)
178 {
179 eProbaShellMap[j].clear();
180 pProbaShellMap[j].clear();
181
182 eDiffCrossSectionData[j].clear();
183 pDiffCrossSectionData[j].clear();
184
185 eNrjTransfData[j].clear();
186 pNrjTransfData[j].clear();
187 }
188
189 //
190 eTdummyVec.push_back(0.);
191 while(!eDiffCrossSection.eof())
192 {
193 G4double tDummy;
194 G4double eDummy;
195 eDiffCrossSection>>tDummy>>eDummy;
196 if (tDummy != eTdummyVec.back()) eTdummyVec.push_back(tDummy);
197
198 G4double tmp;
199 for (int j=0; j<6; j++)
200 {
201 eDiffCrossSection>> tmp;
202
203 eDiffCrossSectionData[j][tDummy][eDummy] = tmp;
204
205 if (fasterCode)
206 {
207 eNrjTransfData[j][tDummy][eDiffCrossSectionData[j][tDummy][eDummy]]=eDummy;
208 eProbaShellMap[j][tDummy].push_back(eDiffCrossSectionData[j][tDummy][eDummy]);
209 }
210 else
211 {
212 // SI - only if eof is not reached !
213 if (!eDiffCrossSection.eof()) eDiffCrossSectionData[j][tDummy][eDummy]*=scaleFactor;
214 eVecm[tDummy].push_back(eDummy);
215 }
216
217 }
218 }
219 //
220
221 // *** PROTON
222 tableFile[proton] = fileProton;
223 lowEnergyLimit[proton] = 50. * keV;
224 highEnergyLimit[proton] = 10. * GeV;
225
226 // Cross section
227 G4MicroElecCrossSectionDataSet* tableP = new G4MicroElecCrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
228 tableP->LoadData(fileProton);
229 tableData[proton] = tableP;
230
231 // Final state
232 std::ostringstream pFullFileName;
233
234 if (fasterCode) pFullFileName << path << "/microelec/sigmadiff_cumulated_inelastic_p_Si.dat";
235 else pFullFileName << path << "/microelec/sigmadiff_inelastic_p_Si.dat";
236
237 std::ifstream pDiffCrossSection(pFullFileName.str().c_str());
238
239 if (!pDiffCrossSection)
240 {
241 if (fasterCode) G4Exception("G4MicroElecInelasticModel::Initialise","em0003",
242 FatalException,"Missing data file:/microelec/sigmadiff_cumulated_inelastic_p_Si.dat");
243
244 else G4Exception("G4MicroElecInelasticModel::Initialise","em0003",
245 FatalException,"Missing data file:/microelec/sigmadiff_inelastic_p_Si.dat");
246 }
247
248 pTdummyVec.push_back(0.);
249 while(!pDiffCrossSection.eof())
250 {
251 G4double tDummy;
252 G4double eDummy;
253 pDiffCrossSection>>tDummy>>eDummy;
254 if (tDummy != pTdummyVec.back()) pTdummyVec.push_back(tDummy);
255 for (int j=0; j<6; j++)
256 {
257 pDiffCrossSection>>pDiffCrossSectionData[j][tDummy][eDummy];
258
259 if (fasterCode)
260 {
261 pNrjTransfData[j][tDummy][pDiffCrossSectionData[j][tDummy][eDummy]]=eDummy;
262 pProbaShellMap[j][tDummy].push_back(pDiffCrossSectionData[j][tDummy][eDummy]);
263 }
264 else
265 {
266 // SI - only if eof is not reached !
267 if (!pDiffCrossSection.eof()) pDiffCrossSectionData[j][tDummy][eDummy]*=scaleFactor;
268 pVecm[tDummy].push_back(eDummy);
269 }
270 }
271 }
272
273 if (particle==electronDef)
274 {
275 SetLowEnergyLimit(lowEnergyLimit[electron]);
276 SetHighEnergyLimit(highEnergyLimit[electron]);
277 }
278
279 if (particle==protonDef)
280 {
281 SetLowEnergyLimit(lowEnergyLimit[proton]);
282 SetHighEnergyLimit(highEnergyLimit[proton]);
283 }
284
285 if( verboseLevel>0 )
286 {
287 G4cout << "MicroElec Inelastic model is initialized " << G4endl
288 << "Energy range: "
289 << LowEnergyLimit() / keV << " keV - "
290 << HighEnergyLimit() / MeV << " MeV for "
291 << particle->GetParticleName()
292 << " with mass (amu) " << particle->GetPDGMass()/proton_mass_c2
293 << " and charge " << particle->GetPDGCharge()
294 << G4endl << G4endl ;
295 }
296
297 //
298 fAtomDeexcitation = G4LossTableManager::Instance()->AtomDeexcitation();
299
300 if (isInitialised) { return; }
301 fParticleChangeForGamma = GetParticleChangeForGamma();
302 isInitialised = true;
303 }
304
305 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
306
307 G4double G4MicroElecInelasticModel::CrossSectionPerVolume(const G4Material* material,
308 const G4ParticleDefinition* particleDefinition,
309 G4double ekin,
310 G4double,
311 G4double)
312 {
313 if (verboseLevel > 3)
314 G4cout << "Calling CrossSectionPerVolume() of G4MicroElecInelasticModel" << G4endl;
315
316 G4double density = material->GetTotNbOfAtomsPerVolume();
317
318 // Calculate total cross section for model
319 G4double lowLim = 0;
320 G4double highLim = 0;
321 G4double sigma=0;
322
323 const G4String& particleName = particleDefinition->GetParticleName();
324 G4String nameLocal = particleName ;
325
326 G4double Zeff2 = 1.0;
327 G4double Mion_c2 = particleDefinition->GetPDGMass();
328
329 if (Mion_c2 > proton_mass_c2)
330 {
331 G4ionEffectiveCharge EffCharge ;
332 G4double Zeff = EffCharge.EffectiveCharge(particleDefinition, material,ekin);
333 Zeff2 = Zeff*Zeff;
334
335 if (verboseLevel > 3)
336 G4cout << "Before scaling : " << G4endl
337 << "Particle : " << nameLocal << ", mass : " << Mion_c2/proton_mass_c2 << "*mp, charge " << Zeff
338 << ", Ekin (eV) = " << ekin/eV << G4endl ;
339
340 ekin *= proton_mass_c2/Mion_c2 ;
341 nameLocal = "proton" ;
342
343 if (verboseLevel > 3)
344 G4cout << "After scaling : " << G4endl
345 << "Particle : " << nameLocal << ", Ekin (eV) = " << ekin/eV << G4endl ;
346 }
347
348 if (material == nistSi || material->GetBaseMaterial() == nistSi)
349 {
350 auto pos1 = lowEnergyLimit.find(nameLocal);
351 if (pos1 != lowEnergyLimit.end())
352 {
353 lowLim = pos1->second;
354 }
355
356 auto pos2 = highEnergyLimit.find(nameLocal);
357 if (pos2 != highEnergyLimit.end())
358 {
359 highLim = pos2->second;
360 }
361
362 if (ekin >= lowLim && ekin < highLim)
363 {
364 auto pos = tableData.find(nameLocal);
365 if (pos != tableData.end())
366 {
367 G4MicroElecCrossSectionDataSet* table = pos->second;
368 if (table != nullptr)
369 {
370 sigma = table->FindValue(ekin);
371 }
372 }
373 else
374 {
375 G4Exception("G4MicroElecInelasticModel::CrossSectionPerVolume","em0002",
376 FatalException,"Model not applicable to particle type.");
377 }
378 }
379 else
380 {
381 if (nameLocal!="e-")
382 {
383 // G4cout << "Particle : " << nameLocal << ", Ekin (eV) = " << ekin/eV << G4endl;
384 // G4cout << "### Warning: particle energy out of bounds! ###" << G4endl;
385 }
386 }
387
388 if (verboseLevel > 3)
389 {
390 G4cout << "---> Kinetic energy (eV)=" << ekin/eV << G4endl;
391 G4cout << " - Cross section per Si atom (cm^2)=" << sigma*Zeff2/cm2 << G4endl;
392 G4cout << " - Cross section per Si atom (cm^-1)=" << sigma*density*Zeff2/(1./cm) << G4endl;
393 }
394
395 } // if (SiMaterial)
396 return sigma*density*Zeff2;
397 }
398
399 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
400
401 void G4MicroElecInelasticModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
402 const G4MaterialCutsCouple* couple,
403 const G4DynamicParticle* particle,
404 G4double,
405 G4double)
406 {
407
408 if (verboseLevel > 3)
409 G4cout << "Calling SampleSecondaries() of G4MicroElecInelasticModel" << G4endl;
410
411 G4double lowLim = 0;
412 G4double highLim = 0;
413
414 G4double ekin = particle->GetKineticEnergy();
415 G4double k = ekin ;
416
417 G4ParticleDefinition* PartDef = particle->GetDefinition();
418 const G4String& particleName = PartDef->GetParticleName();
419 G4String nameLocal2 = particleName ;
420 G4double particleMass = particle->GetDefinition()->GetPDGMass();
421
422 if (particleMass > proton_mass_c2)
423 {
424 k *= proton_mass_c2/particleMass ;
425 PartDef = G4Proton::ProtonDefinition();
426 nameLocal2 = "proton" ;
427 }
428
429 auto pos1 = lowEnergyLimit.find(nameLocal2);
430 if (pos1 != lowEnergyLimit.end())
431 {
432 lowLim = pos1->second;
433 }
434
435 auto pos2 = highEnergyLimit.find(nameLocal2);
436 if (pos2 != highEnergyLimit.end())
437 {
438 highLim = pos2->second;
439 }
440
441 if (k >= lowLim && k < highLim)
442 {
443 G4ParticleMomentum primaryDirection = particle->GetMomentumDirection();
444 G4double totalEnergy = ekin + particleMass;
445 G4double pSquare = ekin * (totalEnergy + particleMass);
446 G4double totalMomentum = std::sqrt(pSquare);
447
448 G4int Shell = 0;
449
450 /* if (!fasterCode)*/ Shell = RandomSelect(k,nameLocal2);
451
452 // SI: The following protection is necessary to avoid infinite loops :
453 // sigmadiff_ionisation_e_born.dat has non zero partial xs at 18 eV for shell 3 (ionizationShell ==2)
454 // sigmadiff_cumulated_ionisation_e_born.dat has zero cumulated partial xs at 18 eV for shell 3 (ionizationShell ==2)
455 // this is due to the fact that the max allowed transfered energy is (18+10.79)/2=17.025 eV and only transfered energies
456 // strictly above this value have non zero partial xs in sigmadiff_ionisation_e_born.dat (starting at trans = 17.12 eV)
457
458 G4double bindingEnergy = SiStructure.Energy(Shell);
459
460 if (verboseLevel > 3)
461 {
462 G4cout << "---> Kinetic energy (eV)=" << k/eV << G4endl ;
463 G4cout << "Shell: " << Shell << ", energy: " << bindingEnergy/eV << G4endl;
464 }
465
466 // sample deexcitation
467 std::size_t secNumberInit = 0; // need to know at a certain point the energy of secondaries
468 std::size_t secNumberFinal = 0; // So I'll make the difference and then sum the energies
469
470 //SI: additional protection if tcs interpolation method is modified
471 if (k<bindingEnergy) return;
472
473 G4int Z = 14;
474
475 if(fAtomDeexcitation && Shell > 2) {
476
477 G4AtomicShellEnumerator as = fKShell;
478
479 if (Shell == 4)
480 {
481 as = G4AtomicShellEnumerator(1);
482 }
483 else if (Shell == 3)
484 {
485 as = G4AtomicShellEnumerator(3);
486 }
487
488 const G4AtomicShell* shell = fAtomDeexcitation->GetAtomicShell(Z, as);
489 secNumberInit = fvect->size();
490 fAtomDeexcitation->GenerateParticles(fvect, shell, Z, 0, 0);
491 secNumberFinal = fvect->size();
492 }
493
494 G4double secondaryKinetic=-1000*eV;
495
496 if (!fasterCode)
497 {
498 secondaryKinetic = RandomizeEjectedElectronEnergy(PartDef,k,Shell);
499 }
500 else
501 {
502 secondaryKinetic = RandomizeEjectedElectronEnergyFromCumulatedDcs(PartDef,k,Shell);
503 }
504
505 if (verboseLevel > 3)
506 {
507 G4cout << "Ionisation process" << G4endl;
508 G4cout << "Shell: " << Shell << " Kin. energy (eV)=" << k/eV
509 << " Sec. energy (eV)=" << secondaryKinetic/eV << G4endl;
510 }
511
512 G4ThreeVector deltaDirection =
513 GetAngularDistribution()->SampleDirectionForShell(particle, secondaryKinetic,
514 Z, Shell,
515 couple->GetMaterial());
516
517 if (particle->GetDefinition() == G4Electron::ElectronDefinition())
518 {
519 G4double deltaTotalMomentum = std::sqrt(secondaryKinetic*(secondaryKinetic + 2.*electron_mass_c2 ));
520 G4double finalPx = totalMomentum*primaryDirection.x() - deltaTotalMomentum*deltaDirection.x();
521 G4double finalPy = totalMomentum*primaryDirection.y() - deltaTotalMomentum*deltaDirection.y();
522 G4double finalPz = totalMomentum*primaryDirection.z() - deltaTotalMomentum*deltaDirection.z();
523 G4double finalMomentum = std::sqrt(finalPx*finalPx + finalPy*finalPy + finalPz*finalPz);
524 finalPx /= finalMomentum;
525 finalPy /= finalMomentum;
526 finalPz /= finalMomentum;
527
528 G4ThreeVector direction;
529 direction.set(finalPx,finalPy,finalPz);
530
531 fParticleChangeForGamma->ProposeMomentumDirection(direction.unit()) ;
532 }
533 else
534 fParticleChangeForGamma->ProposeMomentumDirection(primaryDirection) ;
535
536 // note that secondaryKinetic is the energy of the delta ray, not of all secondaries.
537 G4double deexSecEnergy = 0;
538 for (std::size_t j=secNumberInit; j < secNumberFinal; ++j) {
539 deexSecEnergy = deexSecEnergy + (*fvect)[j]->GetKineticEnergy();}
540
541 fParticleChangeForGamma->SetProposedKineticEnergy(ekin-bindingEnergy-secondaryKinetic);
542 fParticleChangeForGamma->ProposeLocalEnergyDeposit(bindingEnergy-deexSecEnergy);
543
544 if (secondaryKinetic>0)
545 {
546 G4DynamicParticle* dp = new G4DynamicParticle (G4Electron::Electron(),deltaDirection,secondaryKinetic) ;
547 fvect->push_back(dp);
548 }
549 }
550 }
551
552 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
553
554 G4double G4MicroElecInelasticModel::RandomizeEjectedElectronEnergy(G4ParticleDefinition* particleDefinition,
555 G4double k, G4int shell)
556 {
557 if (particleDefinition == G4Electron::ElectronDefinition())
558 {
559 G4double maximumEnergyTransfer=0.;
560 if ((k+SiStructure.Energy(shell))/2. > k) maximumEnergyTransfer=k;
561 else maximumEnergyTransfer = (k+SiStructure.Energy(shell))/2.;
562
563 G4double crossSectionMaximum = 0.;
564
565 G4double minEnergy = SiStructure.Energy(shell);
566 G4double maxEnergy = maximumEnergyTransfer;
567 G4int nEnergySteps = 100;
568
569 G4double value(minEnergy);
570 G4double stpEnergy(std::pow(maxEnergy/value, 1./static_cast<G4double>(nEnergySteps-1)));
571 G4int step(nEnergySteps);
572 while (step>0)
573 {
574 step--;
575 G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
576 if(differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
577 value*=stpEnergy;
578 }
579
580 G4double secondaryElectronKineticEnergy=0.;
581 do
582 {
583 secondaryElectronKineticEnergy = G4UniformRand() * (maximumEnergyTransfer-SiStructure.Energy(shell));
584 } while(G4UniformRand()*crossSectionMaximum >
585 DifferentialCrossSection(particleDefinition, k/eV,(secondaryElectronKineticEnergy+SiStructure.Energy(shell))/eV,shell));
586
587 return secondaryElectronKineticEnergy;
588 }
589
590 if (particleDefinition == G4Proton::ProtonDefinition())
591 {
592 G4double maximumEnergyTransfer = 4.* (electron_mass_c2 / proton_mass_c2) * k;
593 G4double crossSectionMaximum = 0.;
594
595 G4double minEnergy = SiStructure.Energy(shell);
596 G4double maxEnergy = maximumEnergyTransfer;
597 G4int nEnergySteps = 100;
598
599 G4double value(minEnergy);
600 G4double stpEnergy(std::pow(maxEnergy/value, 1./static_cast<G4double>(nEnergySteps-1)));
601 G4int step(nEnergySteps);
602 while (step>0)
603 {
604 step--;
605 G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
606 if(differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
607 value*=stpEnergy;
608 }
609
610 G4double secondaryElectronKineticEnergy = 0.;
611 do
612 {
613 secondaryElectronKineticEnergy = G4UniformRand() * (maximumEnergyTransfer-SiStructure.Energy(shell));
614
615 } while(G4UniformRand()*crossSectionMaximum >
616 DifferentialCrossSection(particleDefinition, k/eV,(secondaryElectronKineticEnergy+SiStructure.Energy(shell))/eV,shell));
617 return secondaryElectronKineticEnergy;
618 }
619
620 return 0;
621 }
622
623 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
624
625 // The following section is not used anymore but is kept for memory
626 // GetAngularDistribution()->SampleDirectionForShell is used instead
627
628 /*void G4MicroElecInelasticModel::RandomizeEjectedElectronDirection(G4ParticleDefinition* particleDefinition,
629 G4double k,
630 G4double secKinetic,
631 G4double & cosTheta,
632 G4double & phi )
633 {
634 if (particleDefinition == G4Electron::ElectronDefinition())
635 {
636 phi = twopi * G4UniformRand();
637 G4double sin2O = (1.-secKinetic/k) / (1.+secKinetic/(2.*electron_mass_c2));
638 cosTheta = std::sqrt(1.-sin2O);
639 }
640
641 if (particleDefinition == G4Proton::ProtonDefinition())
642 {
643 G4double maxSecKinetic = 4.* (electron_mass_c2 / proton_mass_c2) * k;
644 phi = twopi * G4UniformRand();
645 cosTheta = std::sqrt(secKinetic / maxSecKinetic);
646 }
647
648 else
649 {
650 G4double maxSecKinetic = 4.* (electron_mass_c2 / particleDefinition->GetPDGMass()) * k;
651 phi = twopi * G4UniformRand();
652 cosTheta = std::sqrt(secKinetic / maxSecKinetic);
653 }
654 }
655 */
656
657 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
658
659 G4double G4MicroElecInelasticModel::DifferentialCrossSection(G4ParticleDefinition * particleDefinition,
660 G4double k,
661 G4double energyTransfer,
662 G4int LevelIndex)
663 {
664 G4double sigma = 0.;
665
666 if (energyTransfer >= SiStructure.Energy(LevelIndex))
667 {
668 G4double valueT1 = 0;
669 G4double valueT2 = 0;
670 G4double valueE21 = 0;
671 G4double valueE22 = 0;
672 G4double valueE12 = 0;
673 G4double valueE11 = 0;
674
675 G4double xs11 = 0;
676 G4double xs12 = 0;
677 G4double xs21 = 0;
678 G4double xs22 = 0;
679
680 if (particleDefinition == G4Electron::ElectronDefinition())
681 {
682 // k should be in eV and energy transfer eV also
683 auto t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
684 auto t1 = t2-1;
685 // The following condition avoids situations where energyTransfer >last vector element
686 if (energyTransfer <= eVecm[(*t1)].back() && energyTransfer <= eVecm[(*t2)].back() )
687 {
688 auto e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), energyTransfer);
689 auto e11 = e12-1;
690 auto e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), energyTransfer);
691 auto e21 = e22-1;
692
693 valueT1 =*t1;
694 valueT2 =*t2;
695 valueE21 =*e21;
696 valueE22 =*e22;
697 valueE12 =*e12;
698 valueE11 =*e11;
699
700 xs11 = eDiffCrossSectionData[LevelIndex][valueT1][valueE11];
701 xs12 = eDiffCrossSectionData[LevelIndex][valueT1][valueE12];
702 xs21 = eDiffCrossSectionData[LevelIndex][valueT2][valueE21];
703 xs22 = eDiffCrossSectionData[LevelIndex][valueT2][valueE22];
704 }
705 }
706
707 if (particleDefinition == G4Proton::ProtonDefinition())
708 {
709 // k should be in eV and energy transfer eV also
710 auto t2 = std::upper_bound(pTdummyVec.begin(),pTdummyVec.end(), k);
711 auto t1 = t2-1;
712 if (energyTransfer <= pVecm[(*t1)].back() && energyTransfer <= pVecm[(*t2)].back() )
713 {
714 auto e12 = std::upper_bound(pVecm[(*t1)].begin(),pVecm[(*t1)].end(), energyTransfer);
715 auto e11 = e12-1;
716
717 auto e22 = std::upper_bound(pVecm[(*t2)].begin(),pVecm[(*t2)].end(), energyTransfer);
718 auto e21 = e22-1;
719
720 valueT1 =*t1;
721 valueT2 =*t2;
722 valueE21 =*e21;
723 valueE22 =*e22;
724 valueE12 =*e12;
725 valueE11 =*e11;
726
727 xs11 = pDiffCrossSectionData[LevelIndex][valueT1][valueE11];
728 xs12 = pDiffCrossSectionData[LevelIndex][valueT1][valueE12];
729 xs21 = pDiffCrossSectionData[LevelIndex][valueT2][valueE21];
730 xs22 = pDiffCrossSectionData[LevelIndex][valueT2][valueE22];
731 }
732 }
733
734 sigma = QuadInterpolator( valueE11, valueE12,
735 valueE21, valueE22,
736 xs11, xs12,
737 xs21, xs22,
738 valueT1, valueT2,
739 k, energyTransfer);
740 }
741 return sigma;
742 }
743
744 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
745
746 G4double G4MicroElecInelasticModel::Interpolate(G4double e1,
747 G4double e2,
748 G4double e,
749 G4double xs1,
750 G4double xs2)
751 {
752 G4double value = 0.;
753
754 // Log-log interpolation by default
755 if (e1 != 0 && e2 != 0 && (std::log10(e2) - std::log10(e1)) != 0
756 && !fasterCode)
757 {
758 G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
759 G4double b = std::log10(xs2) - a*std::log10(e2);
760 G4double sigma = a*std::log10(e) + b;
761 value = (std::pow(10.,sigma));
762
763 }
764
765 // Switch to log-lin interpolation for faster code
766 if ((e2 - e1) != 0 && xs1 != 0 && xs2 != 0 && fasterCode)
767 {
768 G4double d1 = std::log10(xs1);
769 G4double d2 = std::log10(xs2);
770 value = std::pow(10., (d1 + (d2 - d1) * (e - e1) / (e2 - e1)));
771 }
772
773 // Switch to lin-lin interpolation for faster code
774 // in case one of xs1 or xs2 (=cum proba) value is zero
775 if ((e2 - e1) != 0 && (xs1 == 0 || xs2 == 0)) // && fasterCode)
776 {
777 G4double d1 = xs1;
778 G4double d2 = xs2;
779 value = (d1 + (d2 - d1) * (e - e1) / (e2 - e1));
780 }
781
782 return value;
783 }
784
785 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
786
787 G4double G4MicroElecInelasticModel::QuadInterpolator(G4double e11, G4double e12,
788 G4double e21, G4double e22,
789 G4double xs11, G4double xs12,
790 G4double xs21, G4double xs22,
791 G4double t1, G4double t2,
792 G4double t, G4double e)
793 {
794 G4double interpolatedvalue1 = Interpolate(e11, e12, e, xs11, xs12);
795 G4double interpolatedvalue2 = Interpolate(e21, e22, e, xs21, xs22);
796 G4double value = Interpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
797 return value;
798 }
799
800 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
801
802 G4int G4MicroElecInelasticModel::RandomSelect(G4double k, const G4String& particle )
803 {
804 G4int level = 0;
805
806 auto pos = tableData.find(particle);
807 if (pos != tableData.cend())
808 {
809 G4MicroElecCrossSectionDataSet* table = pos->second;
810
811 if (table != nullptr)
812 {
813 G4double* valuesBuffer = new G4double[table->NumberOfComponents()];
814 const G4int n = (G4int)table->NumberOfComponents();
815 G4int i(n);
816 G4double value = 0.;
817
818 while (i>0)
819 {
820 --i;
821 valuesBuffer[i] = table->GetComponent(i)->FindValue(k);
822 value += valuesBuffer[i];
823 }
824
825 value *= G4UniformRand();
826
827 i = n;
828
829 while (i > 0)
830 {
831 --i;
832
833 if (valuesBuffer[i] > value)
834 {
835 delete[] valuesBuffer;
836 return i;
837 }
838 value -= valuesBuffer[i];
839 }
840
841 if (valuesBuffer) delete[] valuesBuffer;
842
843 }
844 }
845 else
846 {
847 G4Exception("G4MicroElecInelasticModel::RandomSelect","em0002",FatalException,"Model not applicable to particle type.");
848 }
849
850 return level;
851 }
852
853 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
854
855 G4double G4MicroElecInelasticModel::RandomizeEjectedElectronEnergyFromCumulatedDcs(G4ParticleDefinition* particleDefinition,
856 G4double k,
857 G4int shell)
858 {
859
860 G4double secondaryElectronKineticEnergy = 0.;
861 G4double random = G4UniformRand();
862 secondaryElectronKineticEnergy = TransferedEnergy(particleDefinition,
863 k / eV,
864 shell,
865 random) * eV
866 - SiStructure.Energy(shell);
867
868 if (secondaryElectronKineticEnergy < 0.)
869 return 0.;
870 //
871 return secondaryElectronKineticEnergy;
872 }
873
874 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
875
876 G4double G4MicroElecInelasticModel::TransferedEnergy(G4ParticleDefinition* particleDefinition,
877 G4double k,
878 G4int ionizationLevelIndex,
879 G4double random)
880 {
881 G4double nrj = 0.;
882
883 G4double valueK1 = 0;
884 G4double valueK2 = 0;
885 G4double valuePROB21 = 0;
886 G4double valuePROB22 = 0;
887 G4double valuePROB12 = 0;
888 G4double valuePROB11 = 0;
889
890 G4double nrjTransf11 = 0;
891 G4double nrjTransf12 = 0;
892 G4double nrjTransf21 = 0;
893 G4double nrjTransf22 = 0;
894
895 G4double maximumEnergyTransfer1 = 0;
896 G4double maximumEnergyTransfer2 = 0;
897 G4double maximumEnergyTransferP = 4.* (electron_mass_c2 / proton_mass_c2) * k;
898 G4double bindingEnergy = SiStructure.Energy(ionizationLevelIndex)*1e6;
899
900 if (particleDefinition == G4Electron::ElectronDefinition())
901 {
902 // k should be in eV
903 auto k2 = std::upper_bound(eTdummyVec.begin(),
904 eTdummyVec.end(),
905 k);
906 auto k1 = k2 - 1;
907
908 /*
909 G4cout << "----> k=" << k
910 << " " << *k1
911 << " " << *k2
912 << " " << random
913 << " " << ionizationLevelIndex
914 << " " << eProbaShellMap[ionizationLevelIndex][(*k1)].back()
915 << " " << eProbaShellMap[ionizationLevelIndex][(*k2)].back()
916 << G4endl;
917 */
918
919 // SI : the following condition avoids situations where random >last vector element
920 if (random <= eProbaShellMap[ionizationLevelIndex][(*k1)].back()
921 && random <= eProbaShellMap[ionizationLevelIndex][(*k2)].back())
922 {
923 auto prob12 =
924 std::upper_bound(eProbaShellMap[ionizationLevelIndex][(*k1)].begin(),
925 eProbaShellMap[ionizationLevelIndex][(*k1)].end(),
926 random);
927 auto prob11 = prob12 - 1;
928 auto prob22 =
929 std::upper_bound(eProbaShellMap[ionizationLevelIndex][(*k2)].begin(),
930 eProbaShellMap[ionizationLevelIndex][(*k2)].end(),
931 random);
932 auto prob21 = prob22 - 1;
933
934 valueK1 = *k1;
935 valueK2 = *k2;
936 valuePROB21 = *prob21;
937 valuePROB22 = *prob22;
938 valuePROB12 = *prob12;
939 valuePROB11 = *prob11;
940
941 // The following condition avoid getting transfered energy < binding energy and forces cumxs = 1 for maximum energy transfer.
942 if(valuePROB11 == 0) nrjTransf11 = bindingEnergy;
943 else nrjTransf11 = eNrjTransfData[ionizationLevelIndex][valueK1][valuePROB11];
944 if(valuePROB12 == 1)
945 {
946 if ((valueK1+bindingEnergy)/2. > valueK1) maximumEnergyTransfer1=valueK1;
947 else maximumEnergyTransfer1 = (valueK1+bindingEnergy)/2.;
948
949 nrjTransf12 = maximumEnergyTransfer1;
950 }
951 else nrjTransf12 = eNrjTransfData[ionizationLevelIndex][valueK1][valuePROB12];
952
953 if(valuePROB21 == 0) nrjTransf21 = bindingEnergy;
954 else nrjTransf21 = eNrjTransfData[ionizationLevelIndex][valueK2][valuePROB21];
955 if(valuePROB22 == 1)
956 {
957 if ((valueK2+bindingEnergy)/2. > valueK2) maximumEnergyTransfer2=valueK2;
958 else maximumEnergyTransfer2 = (valueK2+bindingEnergy)/2.;
959
960 nrjTransf22 = maximumEnergyTransfer2;
961 }
962 else
963 nrjTransf22 = eNrjTransfData[ionizationLevelIndex][valueK2][valuePROB22];
964 }
965 // Avoids cases where cum xs is zero for k1 and is not for k2 (with always k1<k2)
966 if (random > eProbaShellMap[ionizationLevelIndex][(*k1)].back())
967 {
968 auto prob22 =
969 std::upper_bound(eProbaShellMap[ionizationLevelIndex][(*k2)].begin(),
970 eProbaShellMap[ionizationLevelIndex][(*k2)].end(),
971 random);
972
973 auto prob21 = prob22 - 1;
974
975 valueK1 = *k1;
976 valueK2 = *k2;
977 valuePROB21 = *prob21;
978 valuePROB22 = *prob22;
979
980 nrjTransf21 = eNrjTransfData[ionizationLevelIndex][valueK2][valuePROB21];
981 nrjTransf22 = eNrjTransfData[ionizationLevelIndex][valueK2][valuePROB22];
982
983 G4double interpolatedvalue2 = Interpolate(valuePROB21,
984 valuePROB22,
985 random,
986 nrjTransf21,
987 nrjTransf22);
988
989 // zeros are explicitly set
990 G4double value = Interpolate(valueK1, valueK2, k, 0., interpolatedvalue2);
991 return value;
992 }
993 }
994 //
995 else if (particleDefinition == G4Proton::ProtonDefinition())
996 {
997 // k should be in eV
998 auto k2 = std::upper_bound(pTdummyVec.begin(),
999 pTdummyVec.end(),
1000 k);
1001
1002 auto k1 = k2 - 1;
1003
1004 /*
1005 G4cout << "----> k=" << k
1006 << " " << *k1
1007 << " " << *k2
1008 << " " << random
1009 << " " << ionizationLevelIndex
1010 << " " << pProbaShellMap[ionizationLevelIndex][(*k1)].back()
1011 << " " << pProbaShellMap[ionizationLevelIndex][(*k2)].back()
1012 << G4endl;
1013 */
1014
1015 // SI : the following condition avoids situations where random > last vector element,
1016 // for eg. when the last element is zero
1017 if (random <= pProbaShellMap[ionizationLevelIndex][(*k1)].back()
1018 && random <= pProbaShellMap[ionizationLevelIndex][(*k2)].back())
1019 {
1020 auto prob12 =
1021 std::upper_bound(pProbaShellMap[ionizationLevelIndex][(*k1)].begin(),
1022 pProbaShellMap[ionizationLevelIndex][(*k1)].end(),
1023 random);
1024
1025 auto prob11 = prob12 - 1;
1026
1027 auto prob22 =
1028 std::upper_bound(pProbaShellMap[ionizationLevelIndex][(*k2)].begin(),
1029 pProbaShellMap[ionizationLevelIndex][(*k2)].end(),
1030 random);
1031
1032 auto prob21 = prob22 - 1;
1033
1034 valueK1 = *k1;
1035 valueK2 = *k2;
1036 valuePROB21 = *prob21;
1037 valuePROB22 = *prob22;
1038 valuePROB12 = *prob12;
1039 valuePROB11 = *prob11;
1040
1041 // The following condition avoid getting transfered energy < binding energy and forces cumxs = 1 for maximum energy transfer.
1042 if(valuePROB11 == 0) nrjTransf11 = bindingEnergy;
1043 else nrjTransf11 = pNrjTransfData[ionizationLevelIndex][valueK1][valuePROB11];
1044 if(valuePROB12 == 1) nrjTransf12 = maximumEnergyTransferP;
1045 else nrjTransf12 = pNrjTransfData[ionizationLevelIndex][valueK1][valuePROB12];
1046 if(valuePROB21 == 0) nrjTransf21 = bindingEnergy;
1047 else nrjTransf21 = pNrjTransfData[ionizationLevelIndex][valueK2][valuePROB21];
1048 if(valuePROB22 == 1) nrjTransf22 = maximumEnergyTransferP;
1049 else nrjTransf22 = pNrjTransfData[ionizationLevelIndex][valueK2][valuePROB22];
1050
1051 }
1052
1053 // Avoids cases where cum xs is zero for k1 and is not for k2 (with always k1<k2)
1054 if (random > pProbaShellMap[ionizationLevelIndex][(*k1)].back())
1055 {
1056 auto prob22 =
1057 std::upper_bound(pProbaShellMap[ionizationLevelIndex][(*k2)].begin(),
1058 pProbaShellMap[ionizationLevelIndex][(*k2)].end(),
1059 random);
1060
1061 auto prob21 = prob22 - 1;
1062
1063 valueK1 = *k1;
1064 valueK2 = *k2;
1065 valuePROB21 = *prob21;
1066 valuePROB22 = *prob22;
1067
1068 nrjTransf21 = pNrjTransfData[ionizationLevelIndex][valueK2][valuePROB21];
1069 nrjTransf22 = pNrjTransfData[ionizationLevelIndex][valueK2][valuePROB22];
1070
1071 G4double interpolatedvalue2 = Interpolate(valuePROB21,
1072 valuePROB22,
1073 random,
1074 nrjTransf21,
1075 nrjTransf22);
1076
1077 // zeros are explicitly set
1078 G4double value = Interpolate(valueK1, valueK2, k, 0., interpolatedvalue2);
1079
1080 return value;
1081 }
1082 }
1083 // End electron and proton cases
1084
1085 G4double nrjTransfProduct = nrjTransf11 * nrjTransf12 * nrjTransf21
1086 * nrjTransf22;
1087
1088 if (nrjTransfProduct != 0.)
1089 {
1090 nrj = QuadInterpolator(valuePROB11,
1091 valuePROB12,
1092 valuePROB21,
1093 valuePROB22,
1094 nrjTransf11,
1095 nrjTransf12,
1096 nrjTransf21,
1097 nrjTransf22,
1098 valueK1,
1099 valueK2,
1100 k,
1101 random);
1102 }
1103
1104 return nrj;
1105 }
1106
1107
1108