source: trunk/source/processes/electromagnetic/lowenergy/src/G4DNAChampionElasticModel.cc@ 1005

Last change on this file since 1005 was 968, checked in by garnier, 17 years ago

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26// $Id: G4DNAChampionElasticModel.cc,v 1.3 2009/02/16 11:00:11 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-02-ref-02 $
28//
29
30#include "G4DNAChampionElasticModel.hh"
31
32//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
33
34using namespace std;
35
36//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
37
38G4DNAChampionElasticModel::G4DNAChampionElasticModel(const G4ParticleDefinition*,
39 const G4String& nam)
40:G4VEmModel(nam),isInitialised(false)
41{
42
43 killBelowEnergy = 8.23*eV; // Minimum e- energy for energy loss by excitation
44 lowEnergyLimit = 0 * eV;
45 lowEnergyLimitOfModel = 7 * eV; // The model lower energy is 7 eV
46 highEnergyLimit = 10 * keV;
47 SetLowEnergyLimit(lowEnergyLimit);
48 SetHighEnergyLimit(highEnergyLimit);
49
50 verboseLevel= 0;
51 // Verbosity scale:
52 // 0 = nothing
53 // 1 = warning for energy non-conservation
54 // 2 = details of energy budget
55 // 3 = calculation of cross sections, file openings, sampling of atoms
56 // 4 = entering in methods
57
58 G4cout << "Champion Elastic model is constructed " << G4endl
59 << "Energy range: "
60 << lowEnergyLimit / eV << " eV - "
61 << highEnergyLimit / keV << " keV"
62 << G4endl;
63
64}
65
66//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
67
68G4DNAChampionElasticModel::~G4DNAChampionElasticModel()
69{
70 // For total cross section
71
72 std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
73 for (pos = tableData.begin(); pos != tableData.end(); ++pos)
74 {
75 G4DNACrossSectionDataSet* table = pos->second;
76 delete table;
77 }
78
79 // For final state
80
81 eVecm.clear();
82
83}
84
85//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
86
87void G4DNAChampionElasticModel::Initialise(const G4ParticleDefinition* /*particle*/,
88 const G4DataVector& /*cuts*/)
89{
90
91 if (verboseLevel > 3)
92 G4cout << "Calling G4DNAChampionElasticModel::Initialise()" << G4endl;
93
94 // Energy limits
95
96 if (LowEnergyLimit() < lowEnergyLimit)
97 {
98 G4cout << "G4DNAChampionElasticModel: low energy limit increased from " <<
99 LowEnergyLimit()/eV << " eV to " << lowEnergyLimit/eV << " eV" << G4endl;
100 SetLowEnergyLimit(lowEnergyLimit);
101 }
102
103 if (HighEnergyLimit() > highEnergyLimit)
104 {
105 G4cout << "G4DNAChampionElasticModel: high energy limit decreased from " <<
106 HighEnergyLimit()/keV << " keV to " << highEnergyLimit/keV << " keV" << G4endl;
107 SetHighEnergyLimit(highEnergyLimit);
108 }
109
110 // Reading of data files
111
112 G4double scaleFactor = 1e-16*cm*cm;
113
114 G4String fileElectron("dna/sigma_elastic_e_champion");
115
116 G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
117 G4String electron;
118
119 if (electronDef != 0)
120 {
121 // For total cross section
122
123 electron = electronDef->GetParticleName();
124
125 tableFile[electron] = fileElectron;
126
127 G4DNACrossSectionDataSet* tableE = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
128 tableE->LoadData(fileElectron);
129 tableData[electron] = tableE;
130
131 // For final state
132
133 char *path = getenv("G4LEDATA");
134
135 if (!path)
136 G4Exception("G4FinalStateElasticChampion::Initialise: G4LEDATA environment variable not set");
137
138 std::ostringstream eFullFileName;
139 eFullFileName << path << "/dna/sigmadiff_elastic_e_champion.dat";
140 std::ifstream eDiffCrossSection(eFullFileName.str().c_str());
141
142 if (!eDiffCrossSection) G4Exception("G4DNAChampionElasticModel::Initialise: error opening electron DATA FILE");
143
144 eTdummyVec.push_back(0.);
145
146 while(!eDiffCrossSection.eof())
147 {
148 double tDummy;
149 double eDummy;
150 eDiffCrossSection>>tDummy>>eDummy;
151
152 // SI : mandatory eVecm initialization
153 if (tDummy != eTdummyVec.back())
154 {
155 eTdummyVec.push_back(tDummy);
156 eVecm[tDummy].push_back(0.);
157 }
158
159 eDiffCrossSection>>eDiffCrossSectionData[tDummy][eDummy];
160
161 // SI : only if not end of file reached !
162 if (!eDiffCrossSection.eof()) eDiffCrossSectionData[tDummy][eDummy]*=scaleFactor;
163
164 if (eDummy != eVecm[tDummy].back()) eVecm[tDummy].push_back(eDummy);
165
166 }
167
168 // End final state
169
170 }
171 else G4Exception("G4DNAChampionElasticModel::Initialise: electron is not defined");
172
173 if (verboseLevel > 2)
174 G4cout << "Loaded cross section files for Champion Elastic model" << G4endl;
175
176 G4cout << "Champion Elastic model is initialized " << G4endl
177 << "Energy range: "
178 << LowEnergyLimit() / eV << " eV - "
179 << HighEnergyLimit() / keV << " keV"
180 << G4endl;
181
182 if(!isInitialised)
183 {
184 isInitialised = true;
185
186 if(pParticleChange)
187 fParticleChangeForGamma = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
188 else
189 fParticleChangeForGamma = new G4ParticleChangeForGamma();
190 }
191
192 // InitialiseElementSelectors(particle,cuts);
193
194 // Test if water material
195
196 flagMaterialIsWater= false;
197 densityWater = 0;
198
199 const G4ProductionCutsTable* theCoupleTable = G4ProductionCutsTable::GetProductionCutsTable();
200
201 if(theCoupleTable)
202 {
203 G4int numOfCouples = theCoupleTable->GetTableSize();
204
205 if(numOfCouples>0)
206 {
207 for (G4int i=0; i<numOfCouples; i++)
208 {
209 const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
210 const G4Material* material = couple->GetMaterial();
211
212 size_t j = material->GetNumberOfElements();
213 while (j>0)
214 {
215 j--;
216 const G4Element* element(material->GetElement(j));
217 if (element->GetZ() == 8.)
218 {
219 G4double density = material->GetAtomicNumDensityVector()[j];
220 if (density > 0.)
221 {
222 flagMaterialIsWater = true;
223 densityWater = density;
224
225 if (verboseLevel > 3)
226 G4cout << "Water material is found with density(cm^-3)=" << density/(cm*cm*cm) << G4endl;
227 }
228 }
229 }
230
231 }
232 } // if(numOfCouples>0)
233
234 } // if (theCoupleTable)
235
236}
237
238//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
239
240G4double G4DNAChampionElasticModel::CrossSectionPerVolume(const G4Material*,
241 const G4ParticleDefinition* p,
242 G4double ekin,
243 G4double,
244 G4double)
245{
246 if (verboseLevel > 3)
247 G4cout << "Calling CrossSectionPerVolume() of G4DNAChampionElasticModel" << G4endl;
248
249 // Calculate total cross section for model
250
251 G4double sigma=0;
252
253 if (flagMaterialIsWater)
254 {
255 const G4String& particleName = p->GetParticleName();
256
257 if (ekin >= lowEnergyLimitOfModel && ekin < highEnergyLimit)
258 {
259 std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
260 pos = tableData.find(particleName);
261
262 if (pos != tableData.end())
263 {
264 G4DNACrossSectionDataSet* table = pos->second;
265 if (table != 0)
266 {
267 sigma = table->FindValue(ekin);
268 }
269 }
270 else
271 {
272 G4Exception("G4DNAChampionElasticModel::ComputeCrossSectionPerVolume: attempting to calculate cross section for wrong particle");
273 }
274 }
275
276 if (verboseLevel > 3)
277 {
278 G4cout << "---> Kinetic energy(eV)=" << ekin/eV << G4endl;
279 G4cout << " - Cross section per water molecule (cm^2)=" << sigma/cm/cm << G4endl;
280 G4cout << " - Cross section per water molecule (cm^-1)=" << sigma*densityWater/(1./cm) << G4endl;
281 }
282
283 } // if (flagMaterialIsWater)
284
285 return sigma*densityWater;
286}
287
288//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
289
290void G4DNAChampionElasticModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
291 const G4MaterialCutsCouple* /*couple*/,
292 const G4DynamicParticle* aDynamicElectron,
293 G4double,
294 G4double)
295{
296
297 if (verboseLevel > 3)
298 G4cout << "Calling SampleSecondaries() of G4DNAChampionElasticModel" << G4endl;
299
300 G4double electronEnergy0 = aDynamicElectron->GetKineticEnergy();
301
302 if (electronEnergy0 < killBelowEnergy)
303 {
304 fParticleChangeForGamma->ProposeTrackStatus(fStopAndKill);
305 fParticleChangeForGamma->ProposeLocalEnergyDeposit(electronEnergy0);
306 return ;
307 }
308
309 if (electronEnergy0>= killBelowEnergy && electronEnergy0 < highEnergyLimit)
310 {
311 G4double cosTheta = RandomizeCosTheta(electronEnergy0);
312
313 G4double phi = 2. * pi * G4UniformRand();
314
315 G4ThreeVector zVers = aDynamicElectron->GetMomentumDirection();
316 G4ThreeVector xVers = zVers.orthogonal();
317 G4ThreeVector yVers = zVers.cross(xVers);
318
319 G4double xDir = std::sqrt(1. - cosTheta*cosTheta);
320 G4double yDir = xDir;
321 xDir *= std::cos(phi);
322 yDir *= std::sin(phi);
323
324 G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers));
325
326 fParticleChangeForGamma->ProposeMomentumDirection(zPrimeVers.unit()) ;
327
328 fParticleChangeForGamma->SetProposedKineticEnergy(electronEnergy0);
329 }
330
331}
332
333//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
334
335G4double G4DNAChampionElasticModel::DifferentialCrossSection
336 (G4ParticleDefinition * particleDefinition, G4double k, G4double theta)
337{
338
339 G4double sigma = 0.;
340 G4double valueT1 = 0;
341 G4double valueT2 = 0;
342 G4double valueE21 = 0;
343 G4double valueE22 = 0;
344 G4double valueE12 = 0;
345 G4double valueE11 = 0;
346 G4double xs11 = 0;
347 G4double xs12 = 0;
348 G4double xs21 = 0;
349 G4double xs22 = 0;
350
351 //SI : ensure the correct computation of cross section at the 180*deg limit
352 if (theta==180.) theta=theta-1e-9;
353
354 if (particleDefinition == G4Electron::ElectronDefinition())
355 {
356 std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
357 std::vector<double>::iterator t1 = t2-1;
358
359 std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), theta);
360 std::vector<double>::iterator e11 = e12-1;
361
362 std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), theta);
363 std::vector<double>::iterator e21 = e22-1;
364
365 valueT1 =*t1;
366 valueT2 =*t2;
367 valueE21 =*e21;
368 valueE22 =*e22;
369 valueE12 =*e12;
370 valueE11 =*e11;
371
372 xs11 = eDiffCrossSectionData[valueT1][valueE11];
373 xs12 = eDiffCrossSectionData[valueT1][valueE12];
374 xs21 = eDiffCrossSectionData[valueT2][valueE21];
375 xs22 = eDiffCrossSectionData[valueT2][valueE22];
376
377}
378
379 G4double xsProduct = xs11 * xs12 * xs21 * xs22;
380
381 if (xs11==0 || xs12==0 ||xs21==0 ||xs22==0) return (0.);
382
383 if (xsProduct != 0.)
384 {
385 sigma = QuadInterpolator( valueE11, valueE12,
386 valueE21, valueE22,
387 xs11, xs12,
388 xs21, xs22,
389 valueT1, valueT2,
390 k, theta );
391 }
392
393 return sigma;
394}
395
396//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
397
398G4double G4DNAChampionElasticModel::LinLogInterpolate(G4double e1,
399 G4double e2,
400 G4double e,
401 G4double xs1,
402 G4double xs2)
403{
404 G4double d1 = std::log(xs1);
405 G4double d2 = std::log(xs2);
406 G4double value = std::exp(d1 + (d2 - d1)*(e - e1)/ (e2 - e1));
407 return value;
408}
409
410//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
411
412G4double G4DNAChampionElasticModel::LogLogInterpolate(G4double e1,
413 G4double e2,
414 G4double e,
415 G4double xs1,
416 G4double xs2)
417{
418 G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
419 G4double b = std::log10(xs2) - a*std::log10(e2);
420 G4double sigma = a*std::log10(e) + b;
421 G4double value = (std::pow(10.,sigma));
422 return value;
423}
424
425//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
426
427G4double G4DNAChampionElasticModel::QuadInterpolator(G4double e11, G4double e12,
428 G4double e21, G4double e22,
429 G4double xs11, G4double xs12,
430 G4double xs21, G4double xs22,
431 G4double t1, G4double t2,
432 G4double t, G4double e)
433{
434// Log-Log
435/*
436 G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12);
437 G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22);
438 G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
439*/
440
441// Lin-Log
442 G4double interpolatedvalue1 = LinLogInterpolate(e11, e12, e, xs11, xs12);
443 G4double interpolatedvalue2 = LinLogInterpolate(e21, e22, e, xs21, xs22);
444 G4double value = LinLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
445 return value;
446}
447
448//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
449
450G4double G4DNAChampionElasticModel::RandomizeCosTheta(G4double k)
451{
452 // ***** Similar method as for screened Rutherford scattering
453
454 G4int iMax=180;
455 G4double max=0;
456 G4double tmp=0;
457
458 // Look for maximum :
459 for (G4int i=0; i<iMax; i++)
460 {
461 tmp = DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1));
462 if (tmp>max) max = tmp;
463 }
464
465 G4double oneOverMax=0;
466 if (max!=0) oneOverMax = 1./max;
467
468 G4double cosTheta = 0.;
469 G4double fCosTheta = 0.;
470
471 do
472 {
473 cosTheta = 2. * G4UniformRand() - 1.;
474 fCosTheta = oneOverMax * DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,std::acos(cosTheta)*180./pi);
475 }
476 while (fCosTheta < G4UniformRand());
477
478 if (verboseLevel > 3)
479 {
480 G4cout << "---> Cos(theta)=" << cosTheta << G4endl;
481 }
482
483 return cosTheta;
484}
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