source: trunk/source/processes/electromagnetic/lowenergy/src/G4DNAChampionElasticModel.cc@ 1199

Last change on this file since 1199 was 1196, checked in by garnier, 16 years ago

update CVS release candidate geant4.9.3.01
File size: 14.8 KB
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25//
26// $Id: G4DNAChampionElasticModel.cc,v 1.10 2009/11/03 15:04:25 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-03-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 = 7.4 * eV; // The model lower energy is 7.4 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 if( verboseLevel>0 )
59 {
60 G4cout << "Champion Elastic model is constructed " << G4endl
61 << "Energy range: "
62 << lowEnergyLimit / eV << " eV - "
63 << highEnergyLimit / MeV << " MeV"
64 << G4endl;
65 }
66}
67
68//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
69
70G4DNAChampionElasticModel::~G4DNAChampionElasticModel()
71{
72 // For total cross section
73
74 std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
75 for (pos = tableData.begin(); pos != tableData.end(); ++pos)
76 {
77 G4DNACrossSectionDataSet* table = pos->second;
78 delete table;
79 }
80
81 // For final state
82
83 eVecm.clear();
84
85}
86
87//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88
89void G4DNAChampionElasticModel::Initialise(const G4ParticleDefinition* /*particle*/,
90 const G4DataVector& /*cuts*/)
91{
92
93 if (verboseLevel > 3)
94 G4cout << "Calling G4DNAChampionElasticModel::Initialise()" << G4endl;
95
96 // Energy limits
97
98 if (LowEnergyLimit() < lowEnergyLimit)
99 {
100 G4cout << "G4DNAChampionElasticModel: low energy limit increased from " <<
101 LowEnergyLimit()/eV << " eV to " << lowEnergyLimit/eV << " eV" << G4endl;
102 SetLowEnergyLimit(lowEnergyLimit);
103 }
104
105 if (HighEnergyLimit() > highEnergyLimit)
106 {
107 G4cout << "G4DNAChampionElasticModel: high energy limit decreased from " <<
108 HighEnergyLimit()/MeV << " MeV to " << highEnergyLimit/MeV << " MeV" << G4endl;
109 SetHighEnergyLimit(highEnergyLimit);
110 }
111
112 // Reading of data files
113
114 G4double scaleFactor = 1e-16*cm*cm;
115
116 G4String fileElectron("dna/sigma_elastic_e_champion");
117
118 G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
119 G4String electron;
120
121 if (electronDef != 0)
122 {
123 // For total cross section
124
125 electron = electronDef->GetParticleName();
126
127 tableFile[electron] = fileElectron;
128
129 G4DNACrossSectionDataSet* tableE = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
130 tableE->LoadData(fileElectron);
131 tableData[electron] = tableE;
132
133 // For final state
134
135 char *path = getenv("G4LEDATA");
136
137 if (!path)
138 G4Exception("G4FinalStateElasticChampion::Initialise: G4LEDATA environment variable not set");
139
140 std::ostringstream eFullFileName;
141 eFullFileName << path << "/dna/sigmadiff_elastic_e_champion.dat";
142 std::ifstream eDiffCrossSection(eFullFileName.str().c_str());
143
144 if (!eDiffCrossSection) G4Exception("G4DNAChampionElasticModel::Initialise: error opening electron DATA FILE");
145
146 eTdummyVec.push_back(0.);
147
148 while(!eDiffCrossSection.eof())
149 {
150 double tDummy;
151 double eDummy;
152 eDiffCrossSection>>tDummy>>eDummy;
153
154 // SI : mandatory eVecm initialization
155 if (tDummy != eTdummyVec.back())
156 {
157 eTdummyVec.push_back(tDummy);
158 eVecm[tDummy].push_back(0.);
159 }
160
161 eDiffCrossSection>>eDiffCrossSectionData[tDummy][eDummy];
162
163 // SI : only if not end of file reached !
164 if (!eDiffCrossSection.eof()) eDiffCrossSectionData[tDummy][eDummy]*=scaleFactor;
165
166 if (eDummy != eVecm[tDummy].back()) eVecm[tDummy].push_back(eDummy);
167
168 }
169
170 // End final state
171
172 }
173 else G4Exception("G4DNAChampionElasticModel::Initialise: electron is not defined");
174
175 if (verboseLevel > 2)
176 G4cout << "Loaded cross section files for Champion Elastic model" << G4endl;
177
178 if( verboseLevel>0 )
179 {
180 G4cout << "Champion Elastic model is initialized " << G4endl
181 << "Energy range: "
182 << LowEnergyLimit() / eV << " eV - "
183 << HighEnergyLimit() / MeV << " MeV"
184 << G4endl;
185 }
186
187 if(!isInitialised)
188 {
189 isInitialised = true;
190
191 if(pParticleChange)
192 fParticleChangeForGamma = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
193 else
194 fParticleChangeForGamma = new G4ParticleChangeForGamma();
195 }
196
197 // InitialiseElementSelectors(particle,cuts);
198
199 // Test if water material
200
201 flagMaterialIsWater= false;
202 densityWater = 0;
203
204 const G4ProductionCutsTable* theCoupleTable = G4ProductionCutsTable::GetProductionCutsTable();
205
206 if(theCoupleTable)
207 {
208 G4int numOfCouples = theCoupleTable->GetTableSize();
209
210 if(numOfCouples>0)
211 {
212 for (G4int i=0; i<numOfCouples; i++)
213 {
214 const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
215 const G4Material* material = couple->GetMaterial();
216
217 if (material->GetName() == "G4_WATER")
218 {
219 G4double density = material->GetAtomicNumDensityVector()[1];
220 flagMaterialIsWater = true;
221 densityWater = density;
222
223 if (verboseLevel > 3)
224 G4cout << "****** Water material is found with density(cm^-3)=" << density/(cm*cm*cm) << G4endl;
225 }
226
227 }
228
229 } // if(numOfCouples>0)
230
231 } // if (theCoupleTable)
232
233}
234
235//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
236
237G4double G4DNAChampionElasticModel::CrossSectionPerVolume(const G4Material*,
238 const G4ParticleDefinition* p,
239 G4double ekin,
240 G4double,
241 G4double)
242{
243 if (verboseLevel > 3)
244 G4cout << "Calling CrossSectionPerVolume() of G4DNAChampionElasticModel" << G4endl;
245
246 // Calculate total cross section for model
247
248 G4double sigma=0;
249
250 if (flagMaterialIsWater)
251 {
252 const G4String& particleName = p->GetParticleName();
253
254 if (ekin < highEnergyLimit)
255 {
256 //SI : XS must not be zero otherwise sampling of secondaries method ignored
257 if (ekin < lowEnergyLimitOfModel) ekin = lowEnergyLimitOfModel;
258 //
259
260 std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
261 pos = tableData.find(particleName);
262
263 if (pos != tableData.end())
264 {
265 G4DNACrossSectionDataSet* table = pos->second;
266 if (table != 0)
267 {
268 sigma = table->FindValue(ekin);
269 }
270 }
271 else
272 {
273 G4Exception("G4DNAChampionElasticModel::ComputeCrossSectionPerVolume: attempting to calculate cross section for wrong particle");
274 }
275 }
276
277 if (verboseLevel > 3)
278 {
279 G4cout << "---> Kinetic energy(eV)=" << ekin/eV << G4endl;
280 G4cout << " - Cross section per water molecule (cm^2)=" << sigma/cm/cm << G4endl;
281 G4cout << " - Cross section per water molecule (cm^-1)=" << sigma*densityWater/(1./cm) << G4endl;
282 }
283
284 } // if (flagMaterialIsWater)
285
286 return sigma*densityWater;
287}
288
289//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
290
291void G4DNAChampionElasticModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
292 const G4MaterialCutsCouple* /*couple*/,
293 const G4DynamicParticle* aDynamicElectron,
294 G4double,
295 G4double)
296{
297
298 if (verboseLevel > 3)
299 G4cout << "Calling SampleSecondaries() of G4DNAChampionElasticModel" << G4endl;
300
301 G4double electronEnergy0 = aDynamicElectron->GetKineticEnergy();
302
303 if (electronEnergy0 < killBelowEnergy)
304 {
305 fParticleChangeForGamma->ProposeTrackStatus(fStopAndKill);
306 fParticleChangeForGamma->ProposeLocalEnergyDeposit(electronEnergy0);
307 return ;
308 }
309
310 if (electronEnergy0>= killBelowEnergy && electronEnergy0 < highEnergyLimit)
311 {
312 G4double cosTheta = RandomizeCosTheta(electronEnergy0);
313
314 G4double phi = 2. * pi * G4UniformRand();
315
316 G4ThreeVector zVers = aDynamicElectron->GetMomentumDirection();
317 G4ThreeVector xVers = zVers.orthogonal();
318 G4ThreeVector yVers = zVers.cross(xVers);
319
320 G4double xDir = std::sqrt(1. - cosTheta*cosTheta);
321 G4double yDir = xDir;
322 xDir *= std::cos(phi);
323 yDir *= std::sin(phi);
324
325 G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers));
326
327 fParticleChangeForGamma->ProposeMomentumDirection(zPrimeVers.unit()) ;
328
329 fParticleChangeForGamma->SetProposedKineticEnergy(electronEnergy0);
330 }
331
332}
333
334//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
335
336G4double G4DNAChampionElasticModel::DifferentialCrossSection
337 (G4ParticleDefinition * particleDefinition, G4double k, G4double theta)
338{
339
340 G4double sigma = 0.;
341 G4double valueT1 = 0;
342 G4double valueT2 = 0;
343 G4double valueE21 = 0;
344 G4double valueE22 = 0;
345 G4double valueE12 = 0;
346 G4double valueE11 = 0;
347 G4double xs11 = 0;
348 G4double xs12 = 0;
349 G4double xs21 = 0;
350 G4double xs22 = 0;
351
352 //SI : ensure the correct computation of cross section at the 180*deg limit
353 if (theta==180.) theta=theta-1e-9;
354
355 if (particleDefinition == G4Electron::ElectronDefinition())
356 {
357 std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
358 std::vector<double>::iterator t1 = t2-1;
359
360 std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), theta);
361 std::vector<double>::iterator e11 = e12-1;
362
363 std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), theta);
364 std::vector<double>::iterator e21 = e22-1;
365
366 valueT1 =*t1;
367 valueT2 =*t2;
368 valueE21 =*e21;
369 valueE22 =*e22;
370 valueE12 =*e12;
371 valueE11 =*e11;
372
373 xs11 = eDiffCrossSectionData[valueT1][valueE11];
374 xs12 = eDiffCrossSectionData[valueT1][valueE12];
375 xs21 = eDiffCrossSectionData[valueT2][valueE21];
376 xs22 = eDiffCrossSectionData[valueT2][valueE22];
377
378}
379
380 G4double xsProduct = xs11 * xs12 * xs21 * xs22;
381
382 if (xs11==0 || xs12==0 ||xs21==0 ||xs22==0) return (0.);
383
384 if (xsProduct != 0.)
385 {
386 sigma = QuadInterpolator( valueE11, valueE12,
387 valueE21, valueE22,
388 xs11, xs12,
389 xs21, xs22,
390 valueT1, valueT2,
391 k, theta );
392 }
393
394 return sigma;
395}
396
397//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
398
399G4double G4DNAChampionElasticModel::LinLogInterpolate(G4double e1,
400 G4double e2,
401 G4double e,
402 G4double xs1,
403 G4double xs2)
404{
405 G4double d1 = std::log(xs1);
406 G4double d2 = std::log(xs2);
407 G4double value = std::exp(d1 + (d2 - d1)*(e - e1)/ (e2 - e1));
408 return value;
409}
410
411//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
412
413G4double G4DNAChampionElasticModel::LogLogInterpolate(G4double e1,
414 G4double e2,
415 G4double e,
416 G4double xs1,
417 G4double xs2)
418{
419 G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
420 G4double b = std::log10(xs2) - a*std::log10(e2);
421 G4double sigma = a*std::log10(e) + b;
422 G4double value = (std::pow(10.,sigma));
423 return value;
424}
425
426//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
427
428G4double G4DNAChampionElasticModel::QuadInterpolator(G4double e11, G4double e12,
429 G4double e21, G4double e22,
430 G4double xs11, G4double xs12,
431 G4double xs21, G4double xs22,
432 G4double t1, G4double t2,
433 G4double t, G4double e)
434{
435// Log-Log
436/*
437 G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12);
438 G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22);
439 G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
440*/
441
442// Lin-Log
443 G4double interpolatedvalue1 = LinLogInterpolate(e11, e12, e, xs11, xs12);
444 G4double interpolatedvalue2 = LinLogInterpolate(e21, e22, e, xs21, xs22);
445 G4double value = LinLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
446 return value;
447}
448
449//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
450
451G4double G4DNAChampionElasticModel::RandomizeCosTheta(G4double k)
452{
453 // ***** Similar method as for screened Rutherford scattering
454
455 G4int iMax=180;
456 G4double max=0;
457 G4double tmp=0;
458
459 // Look for maximum :
460 for (G4int i=0; i<iMax; i++)
461 {
462 tmp = DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1));
463 if (tmp>max) max = tmp;
464 }
465
466 G4double oneOverMax=0;
467 if (max!=0) oneOverMax = 1./max;
468
469 G4double cosTheta = 0.;
470 G4double fCosTheta = 0.;
471
472 do
473 {
474 cosTheta = 2. * G4UniformRand() - 1.;
475 fCosTheta = oneOverMax * DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,std::acos(cosTheta)*180./pi);
476 }
477 while (fCosTheta < G4UniformRand());
478
479 if (verboseLevel > 3)
480 {
481 G4cout << "---> Cos(theta)=" << cosTheta << G4endl;
482 }
483
484 return cosTheta;
485}
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