source: trunk/source/processes/electromagnetic/lowenergy/src/G4DNADingfelderChargeIncreaseModel.cc@ 968

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26// $Id: G4DNADingfelderChargeIncreaseModel.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 "G4DNADingfelderChargeIncreaseModel.hh"
31
32//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
33
34using namespace std;
35
36//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
37
38G4DNADingfelderChargeIncreaseModel::G4DNADingfelderChargeIncreaseModel(const G4ParticleDefinition*,
39 const G4String& nam)
40:G4VEmModel(nam),isInitialised(false)
41{
42
43 verboseLevel= 0;
44 // Verbosity scale:
45 // 0 = nothing
46 // 1 = warning for energy non-conservation
47 // 2 = details of energy budget
48 // 3 = calculation of cross sections, file openings, sampling of atoms
49 // 4 = entering in methods
50
51 G4cout << "Dingfelder charge increase model is constructed " << G4endl;
52
53}
54
55//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
56
57G4DNADingfelderChargeIncreaseModel::~G4DNADingfelderChargeIncreaseModel()
58{}
59
60//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
61
62void G4DNADingfelderChargeIncreaseModel::Initialise(const G4ParticleDefinition* particle,
63 const G4DataVector& /*cuts*/)
64{
65
66 if (verboseLevel > 3)
67 G4cout << "Calling G4DNADingfelderChargeIncreaseModel::Initialise()" << G4endl;
68
69 // Energy limits
70
71 G4DNAGenericIonsManager *instance;
72 instance = G4DNAGenericIonsManager::Instance();
73 G4ParticleDefinition* hydrogenDef = instance->GetIon("hydrogen");
74 G4ParticleDefinition* alphaPlusDef = instance->GetIon("alpha+");
75 G4ParticleDefinition* heliumDef = instance->GetIon("helium");
76
77 G4String hydrogen;
78 G4String alphaPlus;
79 G4String helium;
80
81 if (hydrogenDef != 0)
82 {
83 hydrogen = hydrogenDef->GetParticleName();
84 lowEnergyLimit[hydrogen] = 1. * keV;
85 highEnergyLimit[hydrogen] = 10. * MeV;
86 }
87 else
88 {
89 G4Exception("G4DNADingfelderChargeIncreaseModel::Initialise: hydrogen is not defined");
90 }
91
92 if (alphaPlusDef != 0)
93 {
94 alphaPlus = alphaPlusDef->GetParticleName();
95 lowEnergyLimit[alphaPlus] = 1. * keV;
96 highEnergyLimit[alphaPlus] = 10. * MeV;
97 }
98 else
99 {
100 G4Exception("G4DNADingfelderChargeIncreaseModel::Initialise: alphaPlus is not defined");
101 }
102
103 if (heliumDef != 0)
104 {
105 helium = heliumDef->GetParticleName();
106 lowEnergyLimit[helium] = 1. * keV;
107 highEnergyLimit[helium] = 10. * MeV;
108 }
109 else
110 {
111 G4Exception("G4DNADingfelderChargeIncreaseModel::Initialise: helium is not defined");
112 }
113
114 if (particle==hydrogenDef)
115 {
116 SetLowEnergyLimit(lowEnergyLimit[hydrogen]);
117 SetHighEnergyLimit(highEnergyLimit[hydrogen]);
118 }
119
120 if (particle==alphaPlusDef)
121 {
122 SetLowEnergyLimit(lowEnergyLimit[alphaPlus]);
123 SetHighEnergyLimit(highEnergyLimit[alphaPlus]);
124 }
125
126 if (particle==heliumDef)
127 {
128 SetLowEnergyLimit(lowEnergyLimit[helium]);
129 SetHighEnergyLimit(highEnergyLimit[helium]);
130 }
131
132 // Final state
133
134 //ALPHA+
135
136 f0[0][0]=1.;
137 a0[0][0]=2.25;
138 a1[0][0]=-0.75;
139 b0[0][0]=-32.10;
140 c0[0][0]=0.600;
141 d0[0][0]=2.40;
142 x0[0][0]=4.60;
143
144 x1[0][0]=-1.;
145 b1[0][0]=-1.;
146
147 numberOfPartialCrossSections[0]=1;
148
149 //HELIUM
150
151 f0[0][1]=1.;
152 a0[0][1]=2.25;
153 a1[0][1]=-0.75;
154 b0[0][1]=-30.93;
155 c0[0][1]=0.590;
156 d0[0][1]=2.35;
157 x0[0][1]=4.29;
158
159 f0[1][1]=1.;
160 a0[1][1]=2.25;
161 a1[1][1]=-0.75;
162 b0[1][1]=-32.61;
163 c0[1][1]=0.435;
164 d0[1][1]=2.70;
165 x0[1][1]=4.45;
166
167 x1[0][1]=-1.;
168 b1[0][1]=-1.;
169
170 x1[1][1]=-1.;
171 b1[1][1]=-1.;
172
173 numberOfPartialCrossSections[1]=2;
174
175 //
176
177 G4cout << "Dingfelder charge increase model is initialized " << G4endl
178 << "Energy range: "
179 << LowEnergyLimit() / keV << " keV - "
180 << HighEnergyLimit() / MeV << " MeV for "
181 << particle->GetParticleName()
182 << G4endl;
183
184 if(!isInitialised)
185 {
186 isInitialised = true;
187
188 if(pParticleChange)
189 fParticleChangeForGamma = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
190 else
191 fParticleChangeForGamma = new G4ParticleChangeForGamma();
192 }
193
194 // InitialiseElementSelectors(particle,cuts);
195
196 // Test if water material
197
198 flagMaterialIsWater= false;
199 densityWater = 0;
200
201 const G4ProductionCutsTable* theCoupleTable = G4ProductionCutsTable::GetProductionCutsTable();
202
203 if(theCoupleTable)
204 {
205 G4int numOfCouples = theCoupleTable->GetTableSize();
206
207 if(numOfCouples>0)
208 {
209 for (G4int i=0; i<numOfCouples; i++)
210 {
211 const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
212 const G4Material* material = couple->GetMaterial();
213
214 size_t j = material->GetNumberOfElements();
215 while (j>0)
216 {
217 j--;
218 const G4Element* element(material->GetElement(j));
219 if (element->GetZ() == 8.)
220 {
221 G4double density = material->GetAtomicNumDensityVector()[j];
222 if (density > 0.)
223 {
224 flagMaterialIsWater = true;
225 densityWater = density;
226
227 if (verboseLevel > 3)
228 G4cout << "Water material is found with density(cm^-3)=" << density/(cm*cm*cm) << G4endl;
229 }
230 }
231 }
232
233 }
234 } // if(numOfCouples>0)
235
236 } // if (theCoupleTable)
237
238}
239
240//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
241
242G4double G4DNADingfelderChargeIncreaseModel::CrossSectionPerVolume(const G4Material*,
243 const G4ParticleDefinition* particleDefinition,
244 G4double k,
245 G4double,
246 G4double)
247{
248 if (verboseLevel > 3)
249 G4cout << "Calling CrossSectionPerVolume() of G4DNADingfelderChargeIncreaseModel" << G4endl;
250
251 // Calculate total cross section for model
252
253 G4DNAGenericIonsManager *instance;
254 instance = G4DNAGenericIonsManager::Instance();
255
256 if (
257 particleDefinition != instance->GetIon("hydrogen")
258 &&
259 particleDefinition != instance->GetIon("alpha+")
260 &&
261 particleDefinition != instance->GetIon("helium")
262 )
263
264 return 0;
265
266 G4double lowLim = 0;
267 G4double highLim = 0;
268 G4double totalCrossSection = 0.;
269
270 if (flagMaterialIsWater)
271 {
272 const G4String& particleName = particleDefinition->GetParticleName();
273
274 std::map< G4String,G4double,std::less<G4String> >::iterator pos1;
275 pos1 = lowEnergyLimit.find(particleName);
276
277 if (pos1 != lowEnergyLimit.end())
278 {
279 lowLim = pos1->second;
280 }
281
282 std::map< G4String,G4double,std::less<G4String> >::iterator pos2;
283 pos2 = highEnergyLimit.find(particleName);
284
285 if (pos2 != highEnergyLimit.end())
286 {
287 highLim = pos2->second;
288 }
289
290 if (k >= lowLim && k < highLim)
291 {
292 //HYDROGEN
293 if (particleDefinition == instance->GetIon("hydrogen"))
294 {
295 const G4double aa = 2.835;
296 const G4double bb = 0.310;
297 const G4double cc = 2.100;
298 const G4double dd = 0.760;
299 const G4double fac = 1.0e-18;
300 const G4double rr = 13.606 * eV;
301
302 G4double t = k / (proton_mass_c2/electron_mass_c2);
303 G4double x = t / rr;
304 G4double temp = 4.0 * pi * Bohr_radius/nm * Bohr_radius/nm * fac;
305 G4double sigmal = temp * cc * (std::pow(x,dd));
306 G4double sigmah = temp * (aa * std::log(1.0 + x) + bb) / x;
307 totalCrossSection = 1.0/(1.0/sigmal + 1.0/sigmah) *m*m;
308 }
309 else
310 {
311 totalCrossSection = Sum(k,particleDefinition);
312 }
313 }
314
315 if (verboseLevel > 3)
316 {
317 G4cout << "---> Kinetic energy(eV)=" << k/eV << G4endl;
318 G4cout << " - Cross section per water molecule (cm^2)=" << totalCrossSection/cm/cm << G4endl;
319 G4cout << " - Cross section per water molecule (cm^-1)=" << totalCrossSection*densityWater/(1./cm) << G4endl;
320 }
321
322 } // if (flagMaterialIsWater)
323
324 return totalCrossSection*densityWater;
325
326}
327
328//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
329
330void G4DNADingfelderChargeIncreaseModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
331 const G4MaterialCutsCouple* /*couple*/,
332 const G4DynamicParticle* aDynamicParticle,
333 G4double,
334 G4double)
335{
336 if (verboseLevel > 3)
337 G4cout << "Calling SampleSecondaries() of G4DNADingfelderChargeIncreaseModel" << G4endl;
338
339 fParticleChangeForGamma->ProposeTrackStatus(fStopAndKill);
340 fParticleChangeForGamma->ProposeLocalEnergyDeposit(0.);
341
342 G4ParticleDefinition* definition = aDynamicParticle->GetDefinition();
343
344 G4double inK = aDynamicParticle->GetKineticEnergy();
345
346 G4int finalStateIndex = RandomSelect(inK,definition);
347
348 G4int n = NumberOfFinalStates(definition,finalStateIndex);
349
350 G4double outK = inK - IncomingParticleBindingEnergyConstant(definition,finalStateIndex);
351
352 G4DNAGenericIonsManager* instance;
353 instance = G4DNAGenericIonsManager::Instance();
354
355 G4double electronK;
356 if (definition == instance->GetIon("hydrogen")) electronK = inK*electron_mass_c2/proton_mass_c2;
357 else electronK = inK*electron_mass_c2/(3728*MeV);
358
359 if (outK<0)
360 {
361 G4String message;
362 message="G4DNADingfelderChargeIncreaseModel::SampleSecondaries: final kinetic energy is below 0! Process ";
363 }
364
365 G4DynamicParticle* dp = new G4DynamicParticle
366
367 (OutgoingParticleDefinition(definition,finalStateIndex),
368 aDynamicParticle->GetMomentumDirection(),
369 outK) ;
370
371 fvect->push_back(dp);
372
373 n = n - 1;
374
375 while (n>0)
376 {
377 n--;
378 fvect->push_back(new G4DynamicParticle
379 (G4Electron::Electron(), aDynamicParticle->GetMomentumDirection(), electronK) );
380 }
381
382}
383
384//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
385
386G4int G4DNADingfelderChargeIncreaseModel::NumberOfFinalStates(G4ParticleDefinition* particleDefinition,
387 G4int finalStateIndex )
388
389{
390 G4DNAGenericIonsManager* instance;
391 instance = G4DNAGenericIonsManager::Instance();
392 if (particleDefinition == instance->GetIon("hydrogen")) return 2;
393 if (particleDefinition == instance->GetIon("alpha+")) return 2;
394
395 if (particleDefinition == instance->GetIon("helium"))
396 { if (finalStateIndex==0) return 2;
397 return 3;
398 }
399 return 0;
400}
401
402//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
403
404G4ParticleDefinition* G4DNADingfelderChargeIncreaseModel::OutgoingParticleDefinition (G4ParticleDefinition* particleDefinition,
405 G4int finalStateIndex)
406{
407 G4DNAGenericIonsManager * instance(G4DNAGenericIonsManager::Instance());
408 if (particleDefinition == instance->GetIon("hydrogen")) return G4Proton::Proton();
409 if (particleDefinition == instance->GetIon("alpha+")) return instance->GetIon("alpha++");
410
411 if (particleDefinition == instance->GetIon("alpha+")) return instance->GetIon("helium");
412 {
413 if (finalStateIndex==0) return instance->GetIon("alpha+");
414 return instance->GetIon("alpha++");
415 }
416 return 0;
417}
418
419//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
420
421G4double G4DNADingfelderChargeIncreaseModel::IncomingParticleBindingEnergyConstant(G4ParticleDefinition* particleDefinition,
422 G4int finalStateIndex )
423{
424 G4DNAGenericIonsManager * instance(G4DNAGenericIonsManager::Instance());
425 if(particleDefinition == instance->GetIon("hydrogen")) return 13.6*eV;
426
427 if(particleDefinition == instance->GetIon("alpha+"))
428 {
429 // Binding energy for He+ -> He++ + e- 54.509 eV
430 // Binding energy for He -> He+ + e- 24.587 eV
431 return 54.509*eV;
432 }
433
434 if(particleDefinition == instance->GetIon("helium"))
435 {
436 // Binding energy for He+ -> He++ + e- 54.509 eV
437 // Binding energy for He -> He+ + e- 24.587 eV
438
439 if (finalStateIndex==0) return 24.587*eV;
440 return (54.509 + 24.587)*eV;
441 }
442
443 return 0;
444}
445
446//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
447
448//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
449
450G4double G4DNADingfelderChargeIncreaseModel::PartialCrossSection(G4double k, G4int index,
451 const G4ParticleDefinition* particleDefinition)
452{
453
454 G4int particleTypeIndex = 0;
455 G4DNAGenericIonsManager *instance;
456 instance = G4DNAGenericIonsManager::Instance();
457
458 if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=0;
459 if (particleDefinition == instance->GetIon("helium")) particleTypeIndex=1;
460
461 //
462 // sigma(T) = f0 10 ^ y(log10(T/eV))
463 //
464 // / a0 x + b0 x < x0
465 // |
466 // y(x) = < a0 x + b0 - c0 (x - x0)^d0 x0 <= x < x1
467 // |
468 // \ a1 x + b1 x >= x1
469 //
470 //
471 // f0, a0, a1, b0, b1, c0, d0, x0, x1 are parameters that change for protons and helium (0, +, ++)
472 //
473 // f0 has been added to the code in order to manage partial (shell-dependent) cross sections (if no shell dependence is present. f0=1. Sum of f0 over the considered shells should give 1)
474 //
475 // From Rad. Phys. and Chem. 59 (2000) 255-275, M. Dingfelder et al.
476 // Inelastic-collision cross sections of liquid water for interactions of energetic proton
477 //
478
479 if (x1[index][particleTypeIndex]<x0[index][particleTypeIndex])
480 {
481 //
482 // if x1 < x0 means that x1 and b1 will be calculated with the following formula (this piece of code is run on all alphas and not on protons)
483 //
484 // x1 = x0 + ((a0 - a1)/(c0 * d0)) ^ (1 / (d0 - 1))
485 //
486 // b1 = (a0 - a1) * x1 + b0 - c0 * (x1 - x0) ^ d0
487 //
488
489 x1[index][particleTypeIndex]=x0[index][particleTypeIndex] + std::pow((a0[index][particleTypeIndex] - a1[index][particleTypeIndex]) / (c0[index][particleTypeIndex] * d0[index][particleTypeIndex]), 1. / (d0[index][particleTypeIndex] - 1.));
490 b1[index][particleTypeIndex]=(a0[index][particleTypeIndex] - a1[index][particleTypeIndex]) * x1[index][particleTypeIndex] + b0[index][particleTypeIndex] - c0[index][particleTypeIndex] * std::pow(x1[index][particleTypeIndex] - x0[index][particleTypeIndex], d0[index][particleTypeIndex]);
491 }
492
493 G4double x(std::log10(k/eV));
494 G4double y;
495
496 if (x<x0[index][particleTypeIndex])
497 y=a0[index][particleTypeIndex] * x + b0[index][particleTypeIndex];
498 else if (x<x1[index][particleTypeIndex])
499 y=a0[index][particleTypeIndex] * x + b0[index][particleTypeIndex] - c0[index][particleTypeIndex] * std::pow(x - x0[index][particleTypeIndex], d0[index][particleTypeIndex]);
500 else
501 y=a1[index][particleTypeIndex] * x + b1[index][particleTypeIndex];
502
503 return f0[index][particleTypeIndex] * std::pow(10., y)*m*m;
504
505}
506
507//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
508
509G4int G4DNADingfelderChargeIncreaseModel::RandomSelect(G4double k,
510 const G4ParticleDefinition* particleDefinition)
511{
512
513 G4int particleTypeIndex = 0;
514 G4DNAGenericIonsManager *instance;
515 instance = G4DNAGenericIonsManager::Instance();
516
517 if (particleDefinition == instance->GetIon("hydrogen")) return 0;
518 if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=0;
519 if (particleDefinition == instance->GetIon("helium")) particleTypeIndex=1;
520
521 const G4int n = numberOfPartialCrossSections[particleTypeIndex];
522 G4double* values(new G4double[n]);
523 G4double value = 0;
524 G4int i = n;
525
526 while (i>0)
527 {
528 i--;
529 values[i]=PartialCrossSection(k, i, particleDefinition);
530 value+=values[i];
531 }
532
533 value*=G4UniformRand();
534
535 i=n;
536 while (i>0)
537 {
538 i--;
539
540 if (values[i]>value)
541 break;
542
543 value-=values[i];
544 }
545
546 delete[] values;
547
548 return i;
549}
550
551//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
552
553G4double G4DNADingfelderChargeIncreaseModel::Sum(G4double k, const G4ParticleDefinition* particleDefinition)
554{
555 G4int particleTypeIndex = 0;
556 G4DNAGenericIonsManager *instance;
557 instance = G4DNAGenericIonsManager::Instance();
558
559 if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=0;
560 if (particleDefinition == instance->GetIon("helium")) particleTypeIndex=1;
561
562 G4double totalCrossSection = 0.;
563
564 for (G4int i=0; i<numberOfPartialCrossSections[particleTypeIndex]; i++)
565 {
566 totalCrossSection += PartialCrossSection(k,i,particleDefinition);
567 }
568 return totalCrossSection;
569}
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