source: trunk/source/processes/electromagnetic/standard/src/G4PAIModel.cc @ 1183

Last change on this file since 1183 was 1055, checked in by garnier, 15 years ago

maj sur la beta de geant 4.9.3
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25//
26// $Id: G4PAIModel.cc,v 1.47 2009/04/09 18:41:18 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03-beta-cand-01 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class
32// File name:     G4PAIModel.cc
33//
34// Author: Vladimir.Grichine@cern.ch on base of Vladimir Ivanchenko code
35//
36// Creation date: 05.10.2003
37//
38// Modifications:
39//
40// 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary
41// 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection, SampleSecondary
42// 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko)
43//
44
45#include "G4Region.hh"
46#include "G4PhysicsLogVector.hh"
47#include "G4PhysicsFreeVector.hh"
48#include "G4PhysicsTable.hh"
49#include "G4ProductionCutsTable.hh"
50#include "G4MaterialCutsCouple.hh"
51#include "G4MaterialTable.hh"
52#include "G4SandiaTable.hh"
53#include "G4OrderedTable.hh"
54
55#include "G4PAIModel.hh"
56#include "Randomize.hh"
57#include "G4Electron.hh"
58#include "G4Positron.hh"
59#include "G4Poisson.hh"
60#include "G4Step.hh"
61#include "G4Material.hh"
62#include "G4DynamicParticle.hh"
63#include "G4ParticleDefinition.hh"
64#include "G4ParticleChangeForLoss.hh"
65#include "G4GeometryTolerance.hh"
66
67////////////////////////////////////////////////////////////////////////
68
69using namespace std;
70
71G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam)
72  : G4VEmModel(nam),G4VEmFluctuationModel(nam),
73  fVerbose(0),
74  fLowestGamma(1.005),
75  fHighestGamma(10000.),
76  fTotBin(200),
77  fMeanNumber(20),
78  fParticle(0),
79  fHighKinEnergy(100.*TeV),
80  fTwoln10(2.0*log(10.0)),
81  fBg2lim(0.0169),
82  fTaulim(8.4146e-3)
83{
84  if(p) SetParticle(p);
85 
86  fElectron = G4Electron::Electron();
87  fPositron = G4Positron::Positron();
88
89  fPAItransferTable  = 0;
90  fPAIdEdxTable      = 0;
91  fSandiaPhotoAbsCof = 0;
92  fdEdxVector        = 0;
93  fLambdaVector      = 0;
94  fdNdxCutVector     = 0;
95
96  isInitialised      = false;
97}
98
99////////////////////////////////////////////////////////////////////////////
100
101G4PAIModel::~G4PAIModel()
102{
103  //  G4cout << "PAI: start destruction" << G4endl;
104  if(fParticleEnergyVector) delete fParticleEnergyVector;
105  if(fdEdxVector)           delete fdEdxVector ;
106  if(fLambdaVector)         delete fLambdaVector;
107  if(fdNdxCutVector)        delete fdNdxCutVector;
108
109  if( fPAItransferTable )
110    {
111      fPAItransferTable->clearAndDestroy();
112      delete fPAItransferTable ;
113    }
114  if( fPAIdEdxTable )
115    {
116      fPAIdEdxTable->clearAndDestroy();
117      delete fPAIdEdxTable ;
118    }
119  if(fSandiaPhotoAbsCof)
120    {
121      for(G4int i=0;i<fSandiaIntervalNumber;i++)
122        {
123          delete[] fSandiaPhotoAbsCof[i];
124        }
125      delete[] fSandiaPhotoAbsCof;
126    }
127  //G4cout << "PAI: end destruction" << G4endl;
128}
129
130///////////////////////////////////////////////////////////////////////////////
131
132void G4PAIModel::SetParticle(const G4ParticleDefinition* p)
133{
134  if(fParticle == p) return;
135  fParticle = p;
136  fMass = fParticle->GetPDGMass();
137  fSpin = fParticle->GetPDGSpin();
138  G4double q = fParticle->GetPDGCharge()/eplus;
139  fChargeSquare = q*q;
140  fLowKinEnergy = 0.2*MeV*fMass/proton_mass_c2;
141  fRatio = electron_mass_c2/fMass;
142  fQc = fMass/fRatio;
143}
144
145////////////////////////////////////////////////////////////////////////////
146
147void G4PAIModel::Initialise(const G4ParticleDefinition* p,
148                            const G4DataVector&)
149{
150  if(isInitialised) return;
151  isInitialised = true;
152
153  SetParticle(p);
154  fLowestKineticEnergy  = fMass*(fLowestGamma  - 1.0);
155  fHighestKineticEnergy = fMass*(fHighestGamma - 1.0);
156
157  fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
158                                                 fHighestKineticEnergy,
159                                                 fTotBin);
160
161  fParticleChange = GetParticleChangeForLoss();
162
163  // Prepare initialization
164
165  fPAItransferTable = new G4PhysicsTable(fTotBin);
166  fPAIdEdxTable = new G4PhysicsTable(fTotBin);
167
168  const G4ProductionCutsTable* theCoupleTable =
169        G4ProductionCutsTable::GetProductionCutsTable();
170  const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
171  size_t numOfMat   = G4Material::GetNumberOfMaterials();
172  size_t numRegions = fPAIRegionVector.size();
173
174  for(size_t iReg = 0; iReg < numRegions; ++iReg) // region loop
175  {
176    const G4Region* curReg = fPAIRegionVector[iReg];
177    for(size_t jMat = 0; jMat < numOfMat; ++jMat) // region material loop
178    {
179      fMaterial  = (*theMaterialTable)[jMat];
180      fCutCouple = theCoupleTable->GetMaterialCutsCouple( fMaterial, 
181                                          curReg->GetProductionCuts() );
182      //G4cout << "Reg <" <<curReg->GetName() << ">  mat <"
183      //             << fMaterial->GetName() << ">  fCouple= "
184      //             << fCutCouple<<G4endl;
185      if( fCutCouple ) {
186        fMaterialCutsCoupleVector.push_back(fCutCouple);
187
188        fDeltaCutInKinEnergy = 
189          (*theCoupleTable->GetEnergyCutsVector(1))[fCutCouple->GetIndex()];
190     
191        //ComputeSandiaPhotoAbsCof();
192        BuildPAIonisationTable();
193
194        fPAIxscBank.push_back(fPAItransferTable);
195        fPAIdEdxBank.push_back(fPAIdEdxTable);
196        fdEdxTable.push_back(fdEdxVector);
197
198        BuildLambdaVector();
199        fdNdxCutTable.push_back(fdNdxCutVector);
200        fLambdaTable.push_back(fLambdaVector);
201      }
202    }
203  }
204}
205
206//////////////////////////////////////////////////////////////////
207
208void G4PAIModel::InitialiseMe(const G4ParticleDefinition*) 
209{}
210
211//////////////////////////////////////////////////////////////////
212
213void G4PAIModel::ComputeSandiaPhotoAbsCof()
214{ 
215  G4int i, j, numberOfElements ;
216  static const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
217
218  G4SandiaTable thisMaterialSandiaTable(fMatIndex) ;
219  numberOfElements = (*theMaterialTable)[fMatIndex]->
220                                              GetNumberOfElements();
221  G4int* thisMaterialZ = new G4int[numberOfElements] ;
222
223  for(i=0;i<numberOfElements;i++) 
224  {
225    thisMaterialZ[i] = 
226    (G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ;
227  } 
228  fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals
229                           (thisMaterialZ,numberOfElements) ;
230
231  fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing
232                           ( thisMaterialZ ,
233                             (*theMaterialTable)[fMatIndex]->GetFractionVector() ,
234                             numberOfElements,fSandiaIntervalNumber) ;
235   
236  fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ;
237
238  for(i=0;i<fSandiaIntervalNumber;i++)  fSandiaPhotoAbsCof[i] = new G4double[5] ;
239   
240  for( i = 0 ; i < fSandiaIntervalNumber ; i++ )
241  {
242    fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0) ; 
243
244    for( j = 1; j < 5 ; j++ )
245    {
246      fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable.
247                                      GetPhotoAbsorpCof(i+1,j)*
248                 (*theMaterialTable)[fMatIndex]->GetDensity() ;
249    }
250  }
251  // delete[] thisMaterialZ ;
252}
253
254////////////////////////////////////////////////////////////////////////////
255//
256// Build tables for the ionization energy loss
257//  the tables are built for MATERIALS
258//                           *********
259
260void G4PAIModel::BuildPAIonisationTable()
261{
262  G4double LowEdgeEnergy , ionloss ;
263  G4double tau, Tmax, Tmin, Tkin, deltaLow, gamma, bg2 ;
264
265  if(fdEdxVector) delete fdEdxVector;
266  fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy,
267                                        fHighestKineticEnergy,
268                                        fTotBin);
269  G4SandiaTable* sandia = fMaterial->GetSandiaTable();
270
271  Tmin = sandia->GetSandiaCofForMaterialPAI(0,0)*keV;
272  deltaLow = 100.*eV; // 0.5*eV ;
273
274  for (G4int i = 0 ; i < fTotBin ; i++)  //The loop for the kinetic energy
275  {
276    LowEdgeEnergy = fParticleEnergyVector->GetLowEdgeEnergy(i) ;
277    tau = LowEdgeEnergy/fMass ;
278    gamma = tau +1. ;
279    // G4cout<<"gamma = "<<gamma<<endl ;
280    bg2 = tau*( tau + 2. );
281    Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); 
282    //    Tmax = std::min(fDeltaCutInKinEnergy, Tmax);
283    Tkin = Tmax ;
284
285    // G4cout<<"proton Tkin = "<<LowEdgeEnergy/MeV<<" MeV"
286    // <<" Tmax = "<<Tmax/MeV<<" MeV"<<G4endl;
287 
288    if ( Tmax < Tmin + deltaLow )  // low energy safety
289      Tkin = Tmin + deltaLow ;
290
291    /*
292    G4PAIxSection protonPAI( fMatIndex,
293                             Tkin,
294                             bg2,
295                             fSandiaPhotoAbsCof,
296                             fSandiaIntervalNumber  ) ;
297    */
298    fPAIySection.Initialize(fMaterial, Tkin, bg2);
299
300    // G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ;
301    // G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ;
302    // G4cout<<"protonPAI.GetSplineSize() = "<<
303    //    protonPAI.GetSplineSize()<<G4endl<<G4endl ;
304
305    G4int n = fPAIySection.GetSplineSize();
306    G4PhysicsFreeVector* transferVector = new G4PhysicsFreeVector(n) ;
307    G4PhysicsFreeVector* dEdxVector = new G4PhysicsFreeVector(n);
308
309    for( G4int k = 0 ; k < n; k++ )
310    {
311      transferVector->PutValue( k ,
312                                fPAIySection.GetSplineEnergy(k+1),
313                                fPAIySection.GetIntegralPAIySection(k+1) ) ;
314      dEdxVector->PutValue( k ,
315                                fPAIySection.GetSplineEnergy(k+1),
316                                fPAIySection.GetIntegralPAIdEdx(k+1) ) ;
317    }
318    ionloss = fPAIySection.GetMeanEnergyLoss() ;   //  total <dE/dx>
319
320    if ( ionloss < DBL_MIN)  ionloss = DBL_MIN;
321    fdEdxVector->PutValue(i,ionloss) ;
322
323    fPAItransferTable->insertAt(i,transferVector) ;
324    fPAIdEdxTable->insertAt(i,dEdxVector) ;
325
326  }                                        // end of Tkin loop
327  //  theLossTable->insert(fdEdxVector);
328  // end of material loop
329  // G4cout<<"G4PAIonisation::BuildPAIonisationTable() have been called"<<G4endl ;
330  // G4cout<<"G4PAIonisation::BuildLossTable() have been called"<<G4endl ;
331}
332
333///////////////////////////////////////////////////////////////////////
334//
335// Build mean free path tables for the delta ray production process
336//     tables are built for MATERIALS
337//
338
339void G4PAIModel::BuildLambdaVector()
340{
341  //G4double kCarTolerance = G4GeometryTolerance::GetInstance()
342  //                         ->GetSurfaceTolerance();
343
344  if (fLambdaVector)   delete fLambdaVector;
345  if (fdNdxCutVector)  delete fdNdxCutVector;
346
347  fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy,
348                                          fHighestKineticEnergy,
349                                          fTotBin                ) ;
350  fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy,
351                                          fHighestKineticEnergy,
352                                          fTotBin                ) ;
353  if(fVerbose > 1)
354  {
355    G4cout<<"PAIModel DeltaCutInKineticEnergyNow = "
356          <<fDeltaCutInKinEnergy/keV<<" keV"<<G4endl;
357  }
358  for (G4int i = 0 ; i < fTotBin ; i++ )
359  {
360    G4double dNdxCut = GetdNdxCut(i,fDeltaCutInKinEnergy) ;
361    G4double lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut ;
362
363    //    if (lambda <= 1000*kCarTolerance) lambda = 1000*kCarTolerance ; // Mmm ???
364
365    fLambdaVector->PutValue(i, lambda) ;
366    fdNdxCutVector->PutValue(i, dNdxCut) ;
367  }
368}
369
370///////////////////////////////////////////////////////////////////////
371//
372// Returns integral PAI cross section for energy transfers >= transferCut
373
374G4double 
375G4PAIModel::GetdNdxCut( G4int iPlace, G4double transferCut)
376{ 
377  G4int iTransfer;
378  G4double x1, x2, y1, y2, dNdxCut;
379  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
380  // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength())
381  //           <<G4endl; 
382  for( iTransfer = 0 ; 
383       iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; 
384       iTransfer++)
385  {
386    if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
387    {
388      break ;
389    }
390  } 
391  if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) )
392  {
393      iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ;
394  }
395  y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ;
396  y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ;
397  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
398  x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
399  x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
400  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
401
402  if ( y1 == y2 )    dNdxCut = y2 ;
403  else
404  {
405    //  if ( x1 == x2  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
406    //    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
407    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*0.5 ;
408    else             dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
409  }
410  //  G4cout<<""<<dNdxCut<<G4endl;
411  return dNdxCut ;
412}
413///////////////////////////////////////////////////////////////////////
414//
415// Returns integral dEdx for energy transfers >= transferCut
416
417G4double 
418G4PAIModel::GetdEdxCut( G4int iPlace, G4double transferCut)
419{ 
420  G4int iTransfer;
421  G4double x1, x2, y1, y2, dEdxCut;
422  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
423  // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength())
424  //           <<G4endl; 
425  for( iTransfer = 0 ; 
426       iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; 
427       iTransfer++)
428  {
429    if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
430    {
431      break ;
432    }
433  } 
434  if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) )
435  {
436      iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ;
437  }
438  y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ;
439  y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ;
440  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
441  x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
442  x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
443  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
444
445  if ( y1 == y2 )    dEdxCut = y2 ;
446  else
447  {
448    //  if ( x1 == x2  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
449    //    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
450    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*0.5 ;
451    else             dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
452  }
453  //  G4cout<<""<<dEdxCut<<G4endl;
454  return dEdxCut ;
455}
456
457//////////////////////////////////////////////////////////////////////////////
458
459G4double G4PAIModel::ComputeDEDXPerVolume(const G4Material*,
460                                          const G4ParticleDefinition* p,
461                                          G4double kineticEnergy,
462                                          G4double cutEnergy)
463{
464  G4int iTkin,iPlace;
465  size_t jMat;
466 
467  //G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
468  G4double cut = cutEnergy;
469
470  G4double massRatio  = fMass/p->GetPDGMass();
471  G4double scaledTkin = kineticEnergy*massRatio;
472  G4double charge     = p->GetPDGCharge();
473  G4double charge2    = charge*charge;
474  const G4MaterialCutsCouple* matCC = CurrentCouple();
475
476  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
477  {
478    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
479  }
480  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
481
482  fPAIdEdxTable = fPAIdEdxBank[jMat];
483  fdEdxVector = fdEdxTable[jMat];
484  for(iTkin = 0 ; iTkin < fTotBin ; iTkin++)
485  {
486    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ;   
487  }
488  iPlace = iTkin - 1;
489  if(iPlace < 0) iPlace = 0;
490  G4double dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cut) );
491  if( dEdx < 0.) dEdx = 0.;
492  return dEdx;
493}
494
495/////////////////////////////////////////////////////////////////////////
496
497G4double G4PAIModel::CrossSectionPerVolume( const G4Material*,
498                                            const G4ParticleDefinition* p,
499                                            G4double kineticEnergy,
500                                            G4double cutEnergy,
501                                            G4double maxEnergy  ) 
502{
503  G4int iTkin,iPlace;
504  size_t jMat;
505  G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
506  if(tmax <= cutEnergy) return 0.0;
507  G4double massRatio  = fMass/p->GetPDGMass();
508  G4double scaledTkin = kineticEnergy*massRatio;
509  G4double charge     = p->GetPDGCharge();
510  G4double charge2    = charge*charge, cross, cross1, cross2;
511  const G4MaterialCutsCouple* matCC = CurrentCouple();
512
513  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
514  {
515    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
516  }
517  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
518
519  fPAItransferTable = fPAIxscBank[jMat];
520
521  for(iTkin = 0 ; iTkin < fTotBin ; iTkin++)
522  {
523    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ;   
524  }
525  iPlace = iTkin - 1;
526  if(iPlace < 0) iPlace = 0;
527
528  // G4cout<<"iPlace = "<<iPlace<<"; tmax = "
529  // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl; 
530  cross1 = GetdNdxCut(iPlace,tmax) ;
531  // G4cout<<"cross1 = "<<cross1<<G4endl; 
532  cross2 = GetdNdxCut(iPlace,cutEnergy) ; 
533  // G4cout<<"cross2 = "<<cross2<<G4endl; 
534  cross  = (cross2-cross1)*charge2;
535  // G4cout<<"cross = "<<cross<<G4endl; 
536  if( cross < DBL_MIN) cross = DBL_MIN;
537  //  if( cross2 < DBL_MIN) cross2 = DBL_MIN;
538
539  // return cross2;
540  return cross;
541}
542
543///////////////////////////////////////////////////////////////////////////
544//
545// It is analog of PostStepDoIt in terms of secondary electron.
546//
547 
548void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
549                                   const G4MaterialCutsCouple* matCC,
550                                   const G4DynamicParticle* dp,
551                                   G4double tmin,
552                                   G4double maxEnergy)
553{
554  size_t jMat;
555  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
556  {
557    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
558  }
559  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
560
561  fPAItransferTable = fPAIxscBank[jMat];
562  fdNdxCutVector    = fdNdxCutTable[jMat];
563
564  G4double tmax = std::min(MaxSecondaryKinEnergy(dp), maxEnergy);
565  if( tmin >= tmax && fVerbose > 0)
566  {
567    G4cout<<"G4PAIModel::SampleSecondary: tmin >= tmax "<<G4endl;
568  }
569  G4ThreeVector direction= dp->GetMomentumDirection();
570  G4double particleMass  = dp->GetMass();
571  G4double kineticEnergy = dp->GetKineticEnergy();
572
573  G4double massRatio     = fMass/particleMass;
574  G4double scaledTkin    = kineticEnergy*massRatio;
575  G4double totalEnergy   = kineticEnergy + particleMass;
576  G4double pSquare       = kineticEnergy*(totalEnergy+particleMass);
577 
578  G4double deltaTkin     = GetPostStepTransfer(scaledTkin);
579
580  // G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV<<" keV "<<G4endl;
581
582  if( deltaTkin <= 0. && fVerbose > 0) 
583  {
584    G4cout<<"G4PAIModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl;
585  }
586  if( deltaTkin <= 0.) return;
587
588  if( deltaTkin > tmax) deltaTkin = tmax;
589
590  G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 ));
591  G4double totalMomentum      = sqrt(pSquare);
592  G4double costheta           = deltaTkin*(totalEnergy + electron_mass_c2)
593                                /(deltaTotalMomentum * totalMomentum);
594
595  if( costheta > 0.99999 ) costheta = 0.99999;
596  G4double sintheta = 0.0;
597  G4double sin2 = 1. - costheta*costheta;
598  if( sin2 > 0.) sintheta = sqrt(sin2);
599
600  //  direction of the delta electron
601  G4double phi  = twopi*G4UniformRand(); 
602  G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta;
603
604  G4ThreeVector deltaDirection(dirx,diry,dirz);
605  deltaDirection.rotateUz(direction);
606  deltaDirection.unit();
607
608  // primary change
609  kineticEnergy -= deltaTkin;
610  G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection;
611  direction = dir.unit();
612  fParticleChange->SetProposedKineticEnergy(kineticEnergy);
613  fParticleChange->SetProposedMomentumDirection(direction);
614
615  // create G4DynamicParticle object for e- delta ray
616  G4DynamicParticle* deltaRay = new G4DynamicParticle;
617  deltaRay->SetDefinition(G4Electron::Electron());
618  deltaRay->SetKineticEnergy( deltaTkin );  //  !!! trick for last steps /2.0 ???
619  deltaRay->SetMomentumDirection(deltaDirection); 
620
621  vdp->push_back(deltaRay);
622}
623
624
625///////////////////////////////////////////////////////////////////////
626//
627// Returns post step PAI energy transfer > cut electron energy according to passed
628// scaled kinetic energy of particle
629
630G4double 
631G4PAIModel::GetPostStepTransfer( G4double scaledTkin )
632{ 
633  // G4cout<<"G4PAIModel::GetPostStepTransfer"<<G4endl ;
634
635  G4int iTkin, iTransfer, iPlace  ;
636  G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ;
637
638  for(iTkin=0;iTkin<fTotBin;iTkin++)
639  {
640    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin))  break ;
641  }
642  iPlace = iTkin - 1 ;
643  // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ;
644  if(iPlace < 0) iPlace = 0;
645  dNdxCut1 = (*fdNdxCutVector)(iPlace) ; 
646  // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ;
647
648
649  if(iTkin == fTotBin) // Fermi plato, try from left
650  {
651      position = dNdxCut1*G4UniformRand() ;
652
653      for( iTransfer = 0;
654 iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
655      {
656        if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ;
657      }
658      transfer = GetEnergyTransfer(iPlace,position,iTransfer);
659  }
660  else
661  {
662    dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; 
663    // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ;
664    if(iTkin == 0) // Tkin is too small, trying from right only
665    {
666      position = dNdxCut2*G4UniformRand() ;
667
668      for( iTransfer = 0;
669  iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
670      {
671        if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ;
672      }
673      transfer = GetEnergyTransfer(iPlace+1,position,iTransfer);
674    } 
675    else // general case: Tkin between two vectors of the material
676    {
677      E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
678      E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin)     ;
679      W  = 1.0/(E2 - E1) ;
680      W1 = (E2 - scaledTkin)*W ;
681      W2 = (scaledTkin - E1)*W ;
682
683      position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ;
684
685        // G4cout<<position<<"\t" ;
686
687      G4int iTrMax1, iTrMax2, iTrMax;
688
689      iTrMax1 = G4int((*fPAItransferTable)(iPlace)->GetVectorLength());
690      iTrMax2 = G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength());
691
692      if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2;
693      else                    iTrMax = iTrMax1;
694
695
696      for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ )
697      {
698          if( position >=
699          ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 +
700            (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) break ;
701      }
702      transfer = GetEnergyTransfer(iPlace,position,iTransfer);
703    }
704  } 
705  // G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ;
706  if(transfer < 0.0 ) transfer = 0.0 ;
707  // if(transfer < DBL_MIN ) transfer = DBL_MIN;
708
709  return transfer ;
710}
711
712///////////////////////////////////////////////////////////////////////
713//
714// Returns random PAI energy transfer according to passed
715// indexes of particle kinetic
716
717G4double
718G4PAIModel::GetEnergyTransfer( G4int iPlace, G4double position, G4int iTransfer )
719{ 
720  G4int iTransferMax;
721  G4double x1, x2, y1, y2, energyTransfer;
722
723  if(iTransfer == 0)
724  {
725    energyTransfer = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
726  } 
727  else
728  {
729    iTransferMax = G4int((*fPAItransferTable)(iPlace)->GetVectorLength());
730
731    if ( iTransfer >= iTransferMax )  iTransfer = iTransferMax - 1;
732   
733    y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1);
734    y2 = (*(*fPAItransferTable)(iPlace))(iTransfer);
735
736    x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1);
737    x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
738
739    if ( x1 == x2 )    energyTransfer = x2;
740    else
741    {
742      if ( y1 == y2  ) energyTransfer = x1 + (x2 - x1)*G4UniformRand();
743      else
744      {
745        energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1);
746      }
747    }
748  }
749  return energyTransfer;
750}
751
752///////////////////////////////////////////////////////////////////////
753
754G4double G4PAIModel::SampleFluctuations( const G4Material* material,
755                                         const G4DynamicParticle* aParticle,
756                                               G4double&,
757                                               G4double& step,
758                                               G4double&)
759{
760  size_t jMat;
761  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
762  {
763    if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break;
764  }
765  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
766
767  fPAItransferTable = fPAIxscBank[jMat];
768  fdNdxCutVector   = fdNdxCutTable[jMat];
769
770  G4int iTkin, iTransfer, iPlace  ;
771  G4long numOfCollisions=0;
772
773  //  G4cout<<"G4PAIModel::SampleFluctuations"<<G4endl ;
774  //G4cout<<"in:  "<<fMaterialCutsCoupleVector[jMat]->GetMaterial()->GetName()<<G4endl ;
775
776  G4double loss = 0.0, charge2 ;
777  G4double stepSum = 0., stepDelta, lambda, omega; 
778  G4double position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber;
779  G4bool numb = true;
780  G4double Tkin       = aParticle->GetKineticEnergy() ;
781  G4double MassRatio  = fMass/aParticle->GetDefinition()->GetPDGMass() ;
782  G4double charge     = aParticle->GetDefinition()->GetPDGCharge() ;
783  charge2             = charge*charge ;
784  G4double TkinScaled = Tkin*MassRatio ;
785
786  for(iTkin=0;iTkin<fTotBin;iTkin++)
787  {
788    if(TkinScaled < fParticleEnergyVector->GetLowEdgeEnergy(iTkin))   break ;
789  }
790  iPlace = iTkin - 1 ; 
791  if(iPlace < 0) iPlace = 0;
792  //  G4cout<<"from search, iPlace = "<<iPlace<<G4endl ;
793  dNdxCut1 = (*fdNdxCutVector)(iPlace) ; 
794  //  G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ;
795
796
797  if(iTkin == fTotBin) // Fermi plato, try from left
798  {
799    meanNumber =((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*step*charge2;
800    if(meanNumber < 0.) meanNumber = 0. ;
801    //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
802    // numOfCollisions = G4Poisson(meanNumber) ;
803    if( meanNumber > 0.) lambda = step/meanNumber;
804    else                 lambda = DBL_MAX;
805    while(numb)
806    {
807     stepDelta = CLHEP::RandExponential::shoot(lambda);
808     stepSum += stepDelta;
809     if(stepSum >= step) break;
810     numOfCollisions++;
811    }   
812    //    G4cout<<"##1 numOfCollisions = "<<numOfCollisions<<G4endl ;
813
814    while(numOfCollisions)
815    {
816      position = dNdxCut1+
817                 ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*G4UniformRand() ;
818
819      for( iTransfer = 0;
820   iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
821      {
822        if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ;
823      }
824      omega = GetEnergyTransfer(iPlace,position,iTransfer);
825      // G4cout<<"G4PAIModel::SampleFluctuations, omega = "<<omega/keV<<" keV; "<<"\t";
826      loss += omega;
827      numOfCollisions-- ;
828    }
829  }
830  else
831  {
832    dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; 
833    //  G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ;
834 
835    if(iTkin == 0) // Tkin is too small, trying from right only
836    {
837      meanNumber =((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*step*charge2;
838      if( meanNumber < 0. ) meanNumber = 0. ;
839      //  numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
840      //  numOfCollisions = G4Poisson(meanNumber) ;
841    if( meanNumber > 0.) lambda = step/meanNumber;
842    else                 lambda = DBL_MAX;
843    while(numb)
844    {
845     stepDelta = CLHEP::RandExponential::shoot(lambda);
846     stepSum += stepDelta;
847     if(stepSum >= step) break;
848     numOfCollisions++;
849    }   
850
851    //G4cout<<"##2 numOfCollisions = "<<numOfCollisions<<G4endl ;
852
853      while(numOfCollisions)
854      {
855        position = dNdxCut2+
856                   ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*G4UniformRand();
857   
858        for( iTransfer = 0;
859   iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
860        {
861          if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ;
862        }
863        omega = GetEnergyTransfer(iPlace,position,iTransfer);
864        // G4cout<<omega/keV<<"\t";
865        loss += omega;
866        numOfCollisions-- ;
867      }
868    } 
869    else // general case: Tkin between two vectors of the material
870    {
871      E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
872      E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin)     ;
873       W = 1.0/(E2 - E1) ;
874      W1 = (E2 - TkinScaled)*W ;
875      W2 = (TkinScaled - E1)*W ;
876
877      // G4cout<<"(*(*fPAItransferTable)(iPlace))(0) = "<<
878      //   (*(*fPAItransferTable)(iPlace))(0)<<G4endl ;
879      // G4cout<<"(*(*fPAItransferTable)(iPlace+1))(0) = "<<
880      //     (*(*fPAItransferTable)(iPlace+1))(0)<<G4endl ;
881
882      meanNumber=( ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*W1 + 
883                   ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*W2 )*step*charge2;
884      if(meanNumber<0.0) meanNumber = 0.0;
885      //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
886      // numOfCollisions = G4Poisson(meanNumber) ;
887    if( meanNumber > 0.) lambda = step/meanNumber;
888    else                 lambda = DBL_MAX;
889    while(numb)
890    {
891     stepDelta = CLHEP::RandExponential::shoot(lambda);
892     stepSum += stepDelta;
893     if(stepSum >= step) break;
894     numOfCollisions++;
895    }   
896
897    //G4cout<<"##3 numOfCollisions = "<<numOfCollisions<<endl ;
898
899      while(numOfCollisions)
900      {
901        position = dNdxCut1*W1 + dNdxCut2*W2 +
902                 ( ( (*(*fPAItransferTable)(iPlace))(0)-dNdxCut1 )*W1 + 
903                    dNdxCut2+
904                  ( (*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2 )*W2 )*G4UniformRand();
905
906        // G4cout<<position<<"\t" ;
907
908        for( iTransfer = 0;
909    iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
910        {
911          if( position >=
912          ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + 
913            (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) )
914          {
915              break ;
916          }
917        }
918        omega =  GetEnergyTransfer(iPlace,position,iTransfer);
919        //  G4cout<<omega/keV<<"\t";
920        loss += omega;
921        numOfCollisions-- ;   
922      }
923    }
924  } 
925  //  G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = "
926  //  <<step/mm<<" mm"<<G4endl ;
927  if(loss > Tkin) loss=Tkin;
928  if(loss < 0.  ) loss = 0.;
929  return loss ;
930
931}
932
933//////////////////////////////////////////////////////////////////////
934//
935// Returns the statistical estimation of the energy loss distribution variance
936//
937
938
939G4double G4PAIModel::Dispersion( const G4Material* material, 
940                                 const G4DynamicParticle* aParticle,
941                                       G4double& tmax, 
942                                       G4double& step       )
943{
944  G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.;
945  for(G4int i = 0 ; i < fMeanNumber; i++)
946  {
947    loss      = SampleFluctuations(material,aParticle,tmax,step,meanLoss);
948    sumLoss  += loss;
949    sumLoss2 += loss*loss;
950  }
951  meanLoss = sumLoss/fMeanNumber;
952  sigma2   = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber;
953  return sigma2;
954}
955
956/////////////////////////////////////////////////////////////////////
957
958G4double G4PAIModel::MaxSecondaryEnergy( const G4ParticleDefinition* p,
959                                         G4double kinEnergy) 
960{
961  G4double tmax = kinEnergy;
962  if(p == fElectron) tmax *= 0.5;
963  else if(p != fPositron) { 
964    G4double mass = p->GetPDGMass();
965    G4double ratio= electron_mass_c2/mass;
966    G4double gamma= kinEnergy/mass + 1.0;
967    tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
968                  (1. + 2.0*gamma*ratio + ratio*ratio);
969  }
970  return tmax;
971}
972
973///////////////////////////////////////////////////////////////
974
975void G4PAIModel::DefineForRegion(const G4Region* r) 
976{
977  fPAIRegionVector.push_back(r);
978}
979
980//
981//
982/////////////////////////////////////////////////
983
984
985
986
987
988
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