source: trunk/source/processes/electromagnetic/lowenergy/src/G4DNABornIonisationModel.cc @ 1317

Last change on this file since 1317 was 1315, checked in by garnier, 14 years ago

update geant4-09-04-beta-cand-01 interfaces-V09-03-09 vis-V09-03-08
File size: 21.7 KB
Line 
1//
2// ********************************************************************
3// * License and Disclaimer                                           *
4// *                                                                  *
5// * The  Geant4 software  is  copyright of the Copyright Holders  of *
6// * the Geant4 Collaboration.  It is provided  under  the terms  and *
7// * conditions of the Geant4 Software License,  included in the file *
8// * LICENSE and available at  http://cern.ch/geant4/license .  These *
9// * include a list of copyright holders.                             *
10// *                                                                  *
11// * Neither the authors of this software system, nor their employing *
12// * institutes,nor the agencies providing financial support for this *
13// * work  make  any representation or  warranty, express or implied, *
14// * regarding  this  software system or assume any liability for its *
15// * use.  Please see the license in the file  LICENSE  and URL above *
16// * for the full disclaimer and the limitation of liability.         *
17// *                                                                  *
18// * This  code  implementation is the result of  the  scientific and *
19// * technical work of the GEANT4 collaboration.                      *
20// * By using,  copying,  modifying or  distributing the software (or *
21// * any work based  on the software)  you  agree  to acknowledge its *
22// * use  in  resulting  scientific  publications,  and indicate your *
23// * acceptance of all terms of the Geant4 Software license.          *
24// ********************************************************************
25//
26// $Id: G4DNABornIonisationModel.cc,v 1.16 2010/03/26 18:10:43 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-04-beta-cand-01 $
28//
29
30#include "G4DNABornIonisationModel.hh"
31//#include "G4DynamicMolecule.hh"
32
33//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
34
35using namespace std;
36
37//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
38
39G4DNABornIonisationModel::G4DNABornIonisationModel(const G4ParticleDefinition*,
40                                             const G4String& nam)
41:G4VEmModel(nam),isInitialised(false)
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  if( verboseLevel>0 ) 
52  { 
53    G4cout << "Born ionisation model is constructed " << G4endl;
54  }
55}
56
57//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
58
59G4DNABornIonisationModel::~G4DNABornIonisationModel()
60{ 
61  // Cross section
62 
63  std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
64  for (pos = tableData.begin(); pos != tableData.end(); ++pos)
65  {
66    G4DNACrossSectionDataSet* table = pos->second;
67    delete table;
68  }
69 
70  // Final state
71 
72  eVecm.clear();
73  pVecm.clear();
74
75}
76
77//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78
79void G4DNABornIonisationModel::Initialise(const G4ParticleDefinition* particle,
80                                       const G4DataVector& /*cuts*/)
81{
82
83  if (verboseLevel > 3)
84    G4cout << "Calling G4DNABornIonisationModel::Initialise()" << G4endl;
85
86  // Energy limits
87
88  G4String fileElectron("dna/sigma_ionisation_e_born");
89  G4String fileProton("dna/sigma_ionisation_p_born");
90
91  G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
92  G4ParticleDefinition* protonDef = G4Proton::ProtonDefinition();
93
94  G4String electron;
95  G4String proton;
96 
97  G4double scaleFactor = (1.e-22 / 3.343) * m*m;
98
99  char *path = getenv("G4LEDATA");
100
101  if (electronDef != 0)
102  {
103    electron = electronDef->GetParticleName();
104
105    tableFile[electron] = fileElectron;
106
107    lowEnergyLimit[electron] = 11. * eV; 
108    highEnergyLimit[electron] = 1. * MeV;
109
110    // Cross section
111   
112    G4DNACrossSectionDataSet* tableE = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
113    tableE->LoadData(fileElectron);
114     
115    tableData[electron] = tableE;
116   
117    // Final state
118   
119    std::ostringstream eFullFileName;
120    eFullFileName << path << "/dna/sigmadiff_ionisation_e_born.dat";
121    std::ifstream eDiffCrossSection(eFullFileName.str().c_str());
122
123    if (!eDiffCrossSection)
124    { 
125      G4Exception("G4DNABornIonisationModel::ERROR OPENING electron DATA FILE");
126    }
127     
128    eTdummyVec.push_back(0.);
129    while(!eDiffCrossSection.eof())
130    {
131      double tDummy;
132      double eDummy;
133      eDiffCrossSection>>tDummy>>eDummy;
134      if (tDummy != eTdummyVec.back()) eTdummyVec.push_back(tDummy);
135      for (int j=0; j<5; j++)
136      {
137        eDiffCrossSection>>eDiffCrossSectionData[j][tDummy][eDummy];
138
139        // SI - only if eof is not reached !
140        if (!eDiffCrossSection.eof()) eDiffCrossSectionData[j][tDummy][eDummy]*=scaleFactor;
141
142        eVecm[tDummy].push_back(eDummy);
143
144      }
145    }
146
147    //
148  }
149  else
150  {
151    G4Exception("G4DNABornIonisationModel::Initialise(): electron is not defined");
152  }
153
154  if (protonDef != 0)
155  {
156    proton = protonDef->GetParticleName();
157
158    tableFile[proton] = fileProton;
159
160    lowEnergyLimit[proton] = 500. * keV;
161    highEnergyLimit[proton] = 100. * MeV;
162
163    // Cross section
164   
165    G4DNACrossSectionDataSet* tableP = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,scaleFactor );
166    tableP->LoadData(fileProton);
167     
168    tableData[proton] = tableP;
169   
170    // Final state
171
172    std::ostringstream pFullFileName;
173    pFullFileName << path << "/dna/sigmadiff_ionisation_p_born.dat";
174    std::ifstream pDiffCrossSection(pFullFileName.str().c_str());
175   
176    if (!pDiffCrossSection)
177    { 
178      G4Exception("G4DNABornIonisationModel::ERROR OPENING proton DATA FILE");
179    }
180     
181    pTdummyVec.push_back(0.);
182    while(!pDiffCrossSection.eof())
183    {
184      double tDummy;
185      double eDummy;
186      pDiffCrossSection>>tDummy>>eDummy;
187      if (tDummy != pTdummyVec.back()) pTdummyVec.push_back(tDummy);
188      for (int j=0; j<5; j++)
189      {
190        pDiffCrossSection>>pDiffCrossSectionData[j][tDummy][eDummy];
191
192        // SI - only if eof is not reached !
193        if (!pDiffCrossSection.eof()) pDiffCrossSectionData[j][tDummy][eDummy]*=scaleFactor;
194
195        pVecm[tDummy].push_back(eDummy);
196      }
197    }
198 
199  }
200  else
201  {
202    G4Exception("G4DNABornIonisationModel::Initialise(): proton is not defined");
203  }
204
205  if (particle==electronDef) 
206  {
207    SetLowEnergyLimit(lowEnergyLimit[electron]);
208    SetHighEnergyLimit(highEnergyLimit[electron]);
209  }
210
211  if (particle==protonDef) 
212  {
213    SetLowEnergyLimit(lowEnergyLimit[proton]);
214    SetHighEnergyLimit(highEnergyLimit[proton]);
215  }
216
217  if( verboseLevel>0 ) 
218  { 
219    G4cout << "Born ionisation model is initialized " << G4endl
220           << "Energy range: "
221           << LowEnergyLimit() / eV << " eV - "
222           << HighEnergyLimit() / keV << " keV for "
223           << particle->GetParticleName()
224           << G4endl;
225  }
226 
227  //
228 
229  if(!isInitialised) 
230  {
231    isInitialised = true;
232 
233    if(pParticleChange)
234      fParticleChangeForGamma = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
235    else
236      fParticleChangeForGamma = new G4ParticleChangeForGamma();
237  }   
238
239  // InitialiseElementSelectors(particle,cuts);
240
241}
242
243//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
244
245G4double G4DNABornIonisationModel::CrossSectionPerVolume(const G4Material* material,
246                                           const G4ParticleDefinition* particleDefinition,
247                                           G4double ekin,
248                                           G4double,
249                                           G4double)
250{
251  if (verboseLevel > 3)
252    G4cout << "Calling CrossSectionPerVolume() of G4DNABornIonisationModel" << G4endl;
253
254  if (
255      particleDefinition != G4Proton::ProtonDefinition()
256      &&
257      particleDefinition != G4Electron::ElectronDefinition()
258     )
259           
260    return 0;
261 
262  // Calculate total cross section for model
263
264  G4double lowLim = 0;
265  G4double highLim = 0;
266  G4double sigma=0;
267
268  if (material->GetName() == "G4_WATER")
269  {
270    const G4String& particleName = particleDefinition->GetParticleName();
271 
272    std::map< G4String,G4double,std::less<G4String> >::iterator pos1;
273    pos1 = lowEnergyLimit.find(particleName);
274    if (pos1 != lowEnergyLimit.end())
275    {
276      lowLim = pos1->second;
277    }
278 
279    std::map< G4String,G4double,std::less<G4String> >::iterator pos2;
280    pos2 = highEnergyLimit.find(particleName);
281    if (pos2 != highEnergyLimit.end())
282    {
283      highLim = pos2->second;
284    }
285
286    if (ekin >= lowLim && ekin < highLim)
287    {
288      std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
289      pos = tableData.find(particleName);
290       
291      if (pos != tableData.end())
292      {
293        G4DNACrossSectionDataSet* table = pos->second;
294        if (table != 0)
295        {
296          sigma = table->FindValue(ekin);
297        }
298      }
299      else
300      {
301        G4Exception("G4DNABornIonisationModel::CrossSectionPerVolume: attempting to calculate cross section for wrong particle");
302      }
303    }
304
305    if (verboseLevel > 3)
306    {
307      G4cout << "---> Kinetic energy(eV)=" << ekin/eV << G4endl;
308      G4cout << " - Cross section per water molecule (cm^2)=" << sigma/cm/cm << G4endl;
309      G4cout << " - Cross section per water molecule (cm^-1)=" << sigma*material->GetAtomicNumDensityVector()[1]/(1./cm) << G4endl;
310    } 
311 
312  } // if (waterMaterial)
313 
314 return sigma*material->GetAtomicNumDensityVector()[1];           
315
316}
317
318//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
319
320void G4DNABornIonisationModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
321                                              const G4MaterialCutsCouple* /*couple*/,
322                                              const G4DynamicParticle* particle,
323                                              G4double,
324                                              G4double)
325{
326
327  if (verboseLevel > 3)
328    G4cout << "Calling SampleSecondaries() of G4DNABornIonisationModel" << G4endl;
329
330  G4double lowLim = 0;
331  G4double highLim = 0;
332
333  G4double k = particle->GetKineticEnergy();
334
335  const G4String& particleName = particle->GetDefinition()->GetParticleName();
336
337  std::map< G4String,G4double,std::less<G4String> >::iterator pos1;
338  pos1 = lowEnergyLimit.find(particleName);
339
340  if (pos1 != lowEnergyLimit.end())
341  {
342    lowLim = pos1->second;
343  }
344
345  std::map< G4String,G4double,std::less<G4String> >::iterator pos2;
346  pos2 = highEnergyLimit.find(particleName);
347
348  if (pos2 != highEnergyLimit.end())
349  {
350    highLim = pos2->second;
351  }
352
353  if (k >= lowLim && k < highLim)
354  {
355    G4ParticleMomentum primaryDirection = particle->GetMomentumDirection();
356    G4double particleMass = particle->GetDefinition()->GetPDGMass();
357    G4double totalEnergy = k + particleMass;
358    G4double pSquare = k * (totalEnergy + particleMass);
359    G4double totalMomentum = std::sqrt(pSquare);
360
361    G4int ionizationShell = RandomSelect(k,particleName);
362 
363    G4double secondaryKinetic = RandomizeEjectedElectronEnergy(particle->GetDefinition(),k,ionizationShell);
364 
365    G4double bindingEnergy = waterStructure.IonisationEnergy(ionizationShell);
366
367    G4double cosTheta = 0.;
368    G4double phi = 0.; 
369    RandomizeEjectedElectronDirection(particle->GetDefinition(), k,secondaryKinetic, cosTheta, phi);
370
371    G4double sinTheta = std::sqrt(1.-cosTheta*cosTheta);
372    G4double dirX = sinTheta*std::cos(phi);
373    G4double dirY = sinTheta*std::sin(phi);
374    G4double dirZ = cosTheta;
375    G4ThreeVector deltaDirection(dirX,dirY,dirZ);
376    deltaDirection.rotateUz(primaryDirection);
377
378    G4double deltaTotalMomentum = std::sqrt(secondaryKinetic*(secondaryKinetic + 2.*electron_mass_c2 ));
379
380    G4double finalPx = totalMomentum*primaryDirection.x() - deltaTotalMomentum*deltaDirection.x();
381    G4double finalPy = totalMomentum*primaryDirection.y() - deltaTotalMomentum*deltaDirection.y();
382    G4double finalPz = totalMomentum*primaryDirection.z() - deltaTotalMomentum*deltaDirection.z();
383    G4double finalMomentum = std::sqrt(finalPx*finalPx + finalPy*finalPy + finalPz*finalPz);
384    finalPx /= finalMomentum;
385    finalPy /= finalMomentum;
386    finalPz /= finalMomentum;
387   
388    G4ThreeVector direction;
389    direction.set(finalPx,finalPy,finalPz);
390   
391    fParticleChangeForGamma->ProposeMomentumDirection(direction.unit()) ;
392    fParticleChangeForGamma->SetProposedKineticEnergy(k-bindingEnergy-secondaryKinetic);
393    fParticleChangeForGamma->ProposeLocalEnergyDeposit(bindingEnergy);
394
395    G4DynamicParticle* dp = new G4DynamicParticle (G4Electron::Electron(),deltaDirection,secondaryKinetic) ;
396    fvect->push_back(dp);
397
398  }
399
400}
401
402//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
403
404G4double G4DNABornIonisationModel::RandomizeEjectedElectronEnergy(G4ParticleDefinition* particleDefinition, 
405G4double k, G4int shell)
406{
407  if (particleDefinition == G4Electron::ElectronDefinition()) 
408  {
409    G4double maximumEnergyTransfer=0.;
410    if ((k+waterStructure.IonisationEnergy(shell))/2. > k) maximumEnergyTransfer=k;
411    else maximumEnergyTransfer = (k+waterStructure.IonisationEnergy(shell))/2.;
412   
413// SI : original method
414/*
415    G4double crossSectionMaximum = 0.;
416    for(G4double value=waterStructure.IonisationEnergy(shell); value<=maximumEnergyTransfer; value+=0.1*eV)
417    {
418      G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
419      if(differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
420    }
421*/
422
423 
424// SI : alternative method
425
426    G4double crossSectionMaximum = 0.;
427
428    G4double minEnergy = waterStructure.IonisationEnergy(shell);
429    G4double maxEnergy = maximumEnergyTransfer;
430    G4int nEnergySteps = 50;
431
432    G4double value(minEnergy);
433    G4double stpEnergy(std::pow(maxEnergy/value, 1./static_cast<G4double>(nEnergySteps-1)));
434    G4int step(nEnergySteps);
435    while (step>0)
436    {
437      step--;
438      G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
439      if(differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
440      value*=stpEnergy;
441    }
442//
443 
444    G4double secondaryElectronKineticEnergy=0.;
445    do 
446    {
447      secondaryElectronKineticEnergy = G4UniformRand() * (maximumEnergyTransfer-waterStructure.IonisationEnergy(shell));
448    } while(G4UniformRand()*crossSectionMaximum >
449      DifferentialCrossSection(particleDefinition, k/eV,(secondaryElectronKineticEnergy+waterStructure.IonisationEnergy(shell))/eV,shell));
450
451    return secondaryElectronKineticEnergy;
452 
453  }
454 
455  if (particleDefinition == G4Proton::ProtonDefinition()) 
456  {
457    G4double maximumKineticEnergyTransfer = 4.* (electron_mass_c2 / proton_mass_c2) * k;
458
459    G4double crossSectionMaximum = 0.;
460    for (G4double value = waterStructure.IonisationEnergy(shell); 
461         value<=4.*waterStructure.IonisationEnergy(shell) ; 
462         value+=0.1*eV)
463    {
464      G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
465      if (differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
466    }
467
468    G4double secondaryElectronKineticEnergy = 0.;
469    do
470    {
471      secondaryElectronKineticEnergy = G4UniformRand() * maximumKineticEnergyTransfer;
472    } while(G4UniformRand()*crossSectionMaximum >= 
473              DifferentialCrossSection(particleDefinition, k/eV,(secondaryElectronKineticEnergy+waterStructure.IonisationEnergy(shell))/eV,shell));
474
475    return secondaryElectronKineticEnergy;
476  }
477
478  return 0;
479}
480
481//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
482
483void G4DNABornIonisationModel::RandomizeEjectedElectronDirection(G4ParticleDefinition* particleDefinition, 
484                                                                   G4double k, 
485                                                                   G4double secKinetic, 
486                                                                   G4double & cosTheta, 
487                                                                   G4double & phi )
488{
489  if (particleDefinition == G4Electron::ElectronDefinition()) 
490  {
491    phi = twopi * G4UniformRand();
492    if (secKinetic < 50.*eV) cosTheta = (2.*G4UniformRand())-1.;
493    else if (secKinetic <= 200.*eV)     
494    {
495      if (G4UniformRand() <= 0.1) cosTheta = (2.*G4UniformRand())-1.;
496      else cosTheta = G4UniformRand()*(std::sqrt(2.)/2);
497    }
498    else       
499    {
500      G4double sin2O = (1.-secKinetic/k) / (1.+secKinetic/(2.*electron_mass_c2));
501      cosTheta = std::sqrt(1.-sin2O);
502    }
503  }
504 
505  if (particleDefinition == G4Proton::ProtonDefinition()) 
506  {
507    G4double maxSecKinetic = 4.* (electron_mass_c2 / proton_mass_c2) * k;
508    phi = twopi * G4UniformRand();
509    cosTheta = std::sqrt(secKinetic / maxSecKinetic);
510  }                     
511}
512
513//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
514
515double G4DNABornIonisationModel::DifferentialCrossSection(G4ParticleDefinition * particleDefinition, 
516                                                            G4double k, 
517                                                            G4double energyTransfer, 
518                                                            G4int ionizationLevelIndex)
519{
520  G4double sigma = 0.;
521
522  if (energyTransfer >= waterStructure.IonisationEnergy(ionizationLevelIndex))
523  {
524    G4double valueT1 = 0;
525    G4double valueT2 = 0;
526    G4double valueE21 = 0;
527    G4double valueE22 = 0;
528    G4double valueE12 = 0;
529    G4double valueE11 = 0;
530
531    G4double xs11 = 0;   
532    G4double xs12 = 0; 
533    G4double xs21 = 0; 
534    G4double xs22 = 0; 
535
536    if (particleDefinition == G4Electron::ElectronDefinition()) 
537    {
538      // k should be in eV and energy transfer eV also
539
540      std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
541
542      std::vector<double>::iterator t1 = t2-1;
543
544      // SI : the following condition avoids situations where energyTransfer >last vector element
545      if (energyTransfer <= eVecm[(*t1)].back() && energyTransfer <= eVecm[(*t2)].back() )
546      {
547        std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), energyTransfer);
548        std::vector<double>::iterator e11 = e12-1;
549
550        std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), energyTransfer);
551        std::vector<double>::iterator e21 = e22-1;
552
553        valueT1  =*t1;
554        valueT2  =*t2;
555        valueE21 =*e21;
556        valueE22 =*e22;
557        valueE12 =*e12;
558        valueE11 =*e11;
559
560        xs11 = eDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE11];
561        xs12 = eDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE12];
562        xs21 = eDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE21];
563        xs22 = eDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE22];
564      }
565
566    }
567 
568   if (particleDefinition == G4Proton::ProtonDefinition()) 
569   {
570      // k should be in eV and energy transfer eV also
571      std::vector<double>::iterator t2 = std::upper_bound(pTdummyVec.begin(),pTdummyVec.end(), k);
572      std::vector<double>::iterator t1 = t2-1;
573     
574        std::vector<double>::iterator e12 = std::upper_bound(pVecm[(*t1)].begin(),pVecm[(*t1)].end(), energyTransfer);
575        std::vector<double>::iterator e11 = e12-1;
576
577        std::vector<double>::iterator e22 = std::upper_bound(pVecm[(*t2)].begin(),pVecm[(*t2)].end(), energyTransfer);
578        std::vector<double>::iterator e21 = e22-1;
579 
580        valueT1  =*t1;
581        valueT2  =*t2;
582        valueE21 =*e21;
583        valueE22 =*e22;
584        valueE12 =*e12;
585        valueE11 =*e11;
586
587        xs11 = pDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE11];
588        xs12 = pDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE12];
589        xs21 = pDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE21];
590        xs22 = pDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE22];
591
592   }
593 
594   G4double xsProduct = xs11 * xs12 * xs21 * xs22;
595   if (xsProduct != 0.)
596   {
597     sigma = QuadInterpolator(     valueE11, valueE12, 
598                                   valueE21, valueE22, 
599                                   xs11, xs12, 
600                                   xs21, xs22, 
601                                   valueT1, valueT2, 
602                                   k, energyTransfer);
603   }
604 
605 }
606 
607  return sigma;
608}
609
610//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
611
612G4double G4DNABornIonisationModel::LogLogInterpolate(G4double e1, 
613                                                       G4double e2, 
614                                                       G4double e, 
615                                                       G4double xs1, 
616                                                       G4double xs2)
617{
618  G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
619  G4double b = std::log10(xs2) - a*std::log10(e2);
620  G4double sigma = a*std::log10(e) + b;
621  G4double value = (std::pow(10.,sigma));
622  return value;
623}
624
625//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
626
627G4double G4DNABornIonisationModel::QuadInterpolator(G4double e11, G4double e12, 
628                                                      G4double e21, G4double e22, 
629                                                      G4double xs11, G4double xs12, 
630                                                      G4double xs21, G4double xs22, 
631                                                      G4double t1, G4double t2, 
632                                                      G4double t, G4double e)
633{
634  G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12);
635  G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22);
636  G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
637  return value;
638}
639
640//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
641
642G4int G4DNABornIonisationModel::RandomSelect(G4double k, const G4String& particle )
643{   
644  G4int level = 0;
645
646  std::map< G4String,G4DNACrossSectionDataSet*,std::less<G4String> >::iterator pos;
647  pos = tableData.find(particle);
648
649  if (pos != tableData.end())
650  {
651    G4DNACrossSectionDataSet* table = pos->second;
652
653    if (table != 0)
654    {
655      G4double* valuesBuffer = new G4double[table->NumberOfComponents()];
656      const size_t n(table->NumberOfComponents());
657      size_t i(n);
658      G4double value = 0.;
659           
660      while (i>0)
661      { 
662        i--;
663        valuesBuffer[i] = table->GetComponent(i)->FindValue(k);
664        value += valuesBuffer[i];
665      }
666           
667      value *= G4UniformRand();
668   
669      i = n;
670           
671      while (i > 0)
672      {
673        i--;
674
675        if (valuesBuffer[i] > value)
676        {
677          delete[] valuesBuffer;
678          return i;
679        }
680        value -= valuesBuffer[i];
681      }
682           
683      if (valuesBuffer) delete[] valuesBuffer;
684   
685    }
686  }
687  else
688  {
689    G4Exception("G4DNABornIonisationModel::RandomSelect attempting to calculate cross section for wrong particle");
690  }
691     
692  return level;
693}
694
Note: See TracBrowser for help on using the repository browser.