source: trunk/source/processes/electromagnetic/lowenergy/src/G4DNAChampionElasticModel.cc@ 1190

Last change on this file since 1190 was 1058, checked in by garnier, 17 years ago

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25//
26// $Id: G4DNAChampionElasticModel.cc,v 1.5 2009/04/29 17:25:21 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-03-beta-cand-01 $
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 * MeV;
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 / MeV << " MeV"
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()/MeV << " MeV to " << highEnergyLimit/MeV << " MeV" << 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() / MeV << " MeV"
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 < highEnergyLimit)
258 {
259 //SI : XS must not be zero otherwise sampling of secondaries method ignored
260 if (ekin < lowEnergyLimitOfModel) ekin = lowEnergyLimitOfModel;
261 //
262
263 std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
264 pos = tableData.find(particleName);
265
266 if (pos != tableData.end())
267 {
268 G4DNACrossSectionDataSet* table = pos->second;
269 if (table != 0)
270 {
271 sigma = table->FindValue(ekin);
272 }
273 }
274 else
275 {
276 G4Exception("G4DNAChampionElasticModel::ComputeCrossSectionPerVolume: attempting to calculate cross section for wrong particle");
277 }
278 }
279
280 if (verboseLevel > 3)
281 {
282 G4cout << "---> Kinetic energy(eV)=" << ekin/eV << G4endl;
283 G4cout << " - Cross section per water molecule (cm^2)=" << sigma/cm/cm << G4endl;
284 G4cout << " - Cross section per water molecule (cm^-1)=" << sigma*densityWater/(1./cm) << G4endl;
285 }
286
287 } // if (flagMaterialIsWater)
288
289 return sigma*densityWater;
290}
291
292//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
293
294void G4DNAChampionElasticModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
295 const G4MaterialCutsCouple* /*couple*/,
296 const G4DynamicParticle* aDynamicElectron,
297 G4double,
298 G4double)
299{
300
301 if (verboseLevel > 3)
302 G4cout << "Calling SampleSecondaries() of G4DNAChampionElasticModel" << G4endl;
303
304 G4double electronEnergy0 = aDynamicElectron->GetKineticEnergy();
305
306 if (electronEnergy0 < killBelowEnergy)
307 {
308 fParticleChangeForGamma->ProposeTrackStatus(fStopAndKill);
309 fParticleChangeForGamma->ProposeLocalEnergyDeposit(electronEnergy0);
310 return ;
311 }
312
313 if (electronEnergy0>= killBelowEnergy && electronEnergy0 < highEnergyLimit)
314 {
315 G4double cosTheta = RandomizeCosTheta(electronEnergy0);
316
317 G4double phi = 2. * pi * G4UniformRand();
318
319 G4ThreeVector zVers = aDynamicElectron->GetMomentumDirection();
320 G4ThreeVector xVers = zVers.orthogonal();
321 G4ThreeVector yVers = zVers.cross(xVers);
322
323 G4double xDir = std::sqrt(1. - cosTheta*cosTheta);
324 G4double yDir = xDir;
325 xDir *= std::cos(phi);
326 yDir *= std::sin(phi);
327
328 G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers));
329
330 fParticleChangeForGamma->ProposeMomentumDirection(zPrimeVers.unit()) ;
331
332 fParticleChangeForGamma->SetProposedKineticEnergy(electronEnergy0);
333 }
334
335}
336
337//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
338
339G4double G4DNAChampionElasticModel::DifferentialCrossSection
340 (G4ParticleDefinition * particleDefinition, G4double k, G4double theta)
341{
342
343 G4double sigma = 0.;
344 G4double valueT1 = 0;
345 G4double valueT2 = 0;
346 G4double valueE21 = 0;
347 G4double valueE22 = 0;
348 G4double valueE12 = 0;
349 G4double valueE11 = 0;
350 G4double xs11 = 0;
351 G4double xs12 = 0;
352 G4double xs21 = 0;
353 G4double xs22 = 0;
354
355 //SI : ensure the correct computation of cross section at the 180*deg limit
356 if (theta==180.) theta=theta-1e-9;
357
358 if (particleDefinition == G4Electron::ElectronDefinition())
359 {
360 std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
361 std::vector<double>::iterator t1 = t2-1;
362
363 std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), theta);
364 std::vector<double>::iterator e11 = e12-1;
365
366 std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), theta);
367 std::vector<double>::iterator e21 = e22-1;
368
369 valueT1 =*t1;
370 valueT2 =*t2;
371 valueE21 =*e21;
372 valueE22 =*e22;
373 valueE12 =*e12;
374 valueE11 =*e11;
375
376 xs11 = eDiffCrossSectionData[valueT1][valueE11];
377 xs12 = eDiffCrossSectionData[valueT1][valueE12];
378 xs21 = eDiffCrossSectionData[valueT2][valueE21];
379 xs22 = eDiffCrossSectionData[valueT2][valueE22];
380
381}
382
383 G4double xsProduct = xs11 * xs12 * xs21 * xs22;
384
385 if (xs11==0 || xs12==0 ||xs21==0 ||xs22==0) return (0.);
386
387 if (xsProduct != 0.)
388 {
389 sigma = QuadInterpolator( valueE11, valueE12,
390 valueE21, valueE22,
391 xs11, xs12,
392 xs21, xs22,
393 valueT1, valueT2,
394 k, theta );
395 }
396
397 return sigma;
398}
399
400//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
401
402G4double G4DNAChampionElasticModel::LinLogInterpolate(G4double e1,
403 G4double e2,
404 G4double e,
405 G4double xs1,
406 G4double xs2)
407{
408 G4double d1 = std::log(xs1);
409 G4double d2 = std::log(xs2);
410 G4double value = std::exp(d1 + (d2 - d1)*(e - e1)/ (e2 - e1));
411 return value;
412}
413
414//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
415
416G4double G4DNAChampionElasticModel::LogLogInterpolate(G4double e1,
417 G4double e2,
418 G4double e,
419 G4double xs1,
420 G4double xs2)
421{
422 G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
423 G4double b = std::log10(xs2) - a*std::log10(e2);
424 G4double sigma = a*std::log10(e) + b;
425 G4double value = (std::pow(10.,sigma));
426 return value;
427}
428
429//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
430
431G4double G4DNAChampionElasticModel::QuadInterpolator(G4double e11, G4double e12,
432 G4double e21, G4double e22,
433 G4double xs11, G4double xs12,
434 G4double xs21, G4double xs22,
435 G4double t1, G4double t2,
436 G4double t, G4double e)
437{
438// Log-Log
439/*
440 G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12);
441 G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22);
442 G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
443*/
444
445// Lin-Log
446 G4double interpolatedvalue1 = LinLogInterpolate(e11, e12, e, xs11, xs12);
447 G4double interpolatedvalue2 = LinLogInterpolate(e21, e22, e, xs21, xs22);
448 G4double value = LinLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
449 return value;
450}
451
452//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
453
454G4double G4DNAChampionElasticModel::RandomizeCosTheta(G4double k)
455{
456 // ***** Similar method as for screened Rutherford scattering
457
458 G4int iMax=180;
459 G4double max=0;
460 G4double tmp=0;
461
462 // Look for maximum :
463 for (G4int i=0; i<iMax; i++)
464 {
465 tmp = DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1));
466 if (tmp>max) max = tmp;
467 }
468
469 G4double oneOverMax=0;
470 if (max!=0) oneOverMax = 1./max;
471
472 G4double cosTheta = 0.;
473 G4double fCosTheta = 0.;
474
475 do
476 {
477 cosTheta = 2. * G4UniformRand() - 1.;
478 fCosTheta = oneOverMax * DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,std::acos(cosTheta)*180./pi);
479 }
480 while (fCosTheta < G4UniformRand());
481
482 if (verboseLevel > 3)
483 {
484 G4cout << "---> Cos(theta)=" << cosTheta << G4endl;
485 }
486
487 return cosTheta;
488}
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