source: trunk/source/processes/electromagnetic/standard/src/G4PAIModel.cc @ 1316

Last change on this file since 1316 was 1315, checked in by garnier, 14 years ago

update geant4-09-04-beta-cand-01 interfaces-V09-03-09 vis-V09-03-08
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25//
26// $Id: G4PAIModel.cc,v 1.52 2010/06/03 07:28:39 grichine Exp $
27// GEANT4 tag $Name: geant4-09-04-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 model interface
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// 26.07.09 Fixed logic to work with several materials (V.Ivantchenko)
44//
45
46#include "G4Region.hh"
47#include "G4PhysicsLogVector.hh"
48#include "G4PhysicsFreeVector.hh"
49#include "G4PhysicsTable.hh"
50#include "G4ProductionCutsTable.hh"
51#include "G4MaterialCutsCouple.hh"
52#include "G4MaterialTable.hh"
53#include "G4SandiaTable.hh"
54#include "G4OrderedTable.hh"
55
56#include "G4PAIModel.hh"
57#include "Randomize.hh"
58#include "G4Electron.hh"
59#include "G4Positron.hh"
60#include "G4Poisson.hh"
61#include "G4Step.hh"
62#include "G4Material.hh"
63#include "G4DynamicParticle.hh"
64#include "G4ParticleDefinition.hh"
65#include "G4ParticleChangeForLoss.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  G4cout<<"G4PAIModel::Initialise for "<<p->GetParticleName()<<G4endl;
151  if(isInitialised) return;
152  isInitialised = true;
153
154  SetParticle(p);
155  fLowestKineticEnergy  = fMass*(fLowestGamma  - 1.0);
156  fHighestKineticEnergy = fMass*(fHighestGamma - 1.0);
157
158  fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
159                                                 fHighestKineticEnergy,
160                                                 fTotBin);
161
162  fParticleChange = GetParticleChangeForLoss();
163
164  // Prepare initialization
165  const G4ProductionCutsTable* theCoupleTable =
166        G4ProductionCutsTable::GetProductionCutsTable();
167  const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
168  size_t numOfMat   = G4Material::GetNumberOfMaterials();
169  size_t numRegions = fPAIRegionVector.size();
170
171  for(size_t iReg = 0; iReg < numRegions; ++iReg) // region loop
172  {
173    const G4Region* curReg = fPAIRegionVector[iReg];
174    for(size_t jMat = 0; jMat < numOfMat; ++jMat) // region material loop
175    {
176      fMaterial  = (*theMaterialTable)[jMat];
177      fCutCouple = theCoupleTable->GetMaterialCutsCouple( fMaterial, 
178                                          curReg->GetProductionCuts() );
179      //G4cout << "Reg <" <<curReg->GetName() << ">  mat <"
180      //             << fMaterial->GetName() << ">  fCouple= "
181      //             << fCutCouple<<"  " << p->GetParticleName() <<G4endl;
182      if( fCutCouple ) {
183        fMaterialCutsCoupleVector.push_back(fCutCouple);
184
185        fPAItransferTable = new G4PhysicsTable(fTotBin+1);
186        fPAIdEdxTable = new G4PhysicsTable(fTotBin+1);
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  fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy,
266                                        fHighestKineticEnergy,
267                                        fTotBin);
268  G4SandiaTable* sandia = fMaterial->GetSandiaTable();
269
270  Tmin = sandia->GetSandiaCofForMaterialPAI(0,0)*keV;
271  deltaLow = 100.*eV; // 0.5*eV ;
272
273  for (G4int i = 0 ; i <= fTotBin ; i++)  //The loop for the kinetic energy
274  {
275    LowEdgeEnergy = fParticleEnergyVector->GetLowEdgeEnergy(i) ;
276    tau = LowEdgeEnergy/fMass ;
277    gamma = tau +1. ;
278    // G4cout<<"gamma = "<<gamma<<endl ;
279    bg2 = tau*( tau + 2. );
280    Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); 
281    //    Tmax = std::min(fDeltaCutInKinEnergy, Tmax);
282    Tkin = Tmax ;
283
284    if ( Tmax < Tmin + deltaLow )  // low energy safety
285      Tkin = Tmin + deltaLow ;
286
287    fPAIySection.Initialize(fMaterial, Tkin, bg2);
288
289    // G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ;
290    // G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ;
291    // G4cout<<"protonPAI.GetSplineSize() = "<<
292    //    protonPAI.GetSplineSize()<<G4endl<<G4endl ;
293
294    G4int n = fPAIySection.GetSplineSize();
295    G4PhysicsFreeVector* transferVector = new G4PhysicsFreeVector(n) ;
296    G4PhysicsFreeVector* dEdxVector = new G4PhysicsFreeVector(n);
297
298    for( G4int k = 0 ; k < n; k++ )
299    {
300      transferVector->PutValue( k ,
301                                fPAIySection.GetSplineEnergy(k+1),
302                                fPAIySection.GetIntegralPAIySection(k+1) ) ;
303      dEdxVector->PutValue( k ,
304                                fPAIySection.GetSplineEnergy(k+1),
305                                fPAIySection.GetIntegralPAIdEdx(k+1) ) ;
306    }
307    ionloss = fPAIySection.GetMeanEnergyLoss() ;   //  total <dE/dx>
308
309    if ( ionloss < DBL_MIN)  ionloss = DBL_MIN;
310    fdEdxVector->PutValue(i,ionloss) ;
311
312    fPAItransferTable->insertAt(i,transferVector) ;
313    fPAIdEdxTable->insertAt(i,dEdxVector) ;
314
315  }                                        // end of Tkin loop
316}
317
318///////////////////////////////////////////////////////////////////////
319//
320// Build mean free path tables for the delta ray production process
321//     tables are built for MATERIALS
322//
323
324void G4PAIModel::BuildLambdaVector()
325{
326  fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy,
327                                          fHighestKineticEnergy,
328                                          fTotBin                ) ;
329  fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy,
330                                          fHighestKineticEnergy,
331                                          fTotBin                ) ;
332  if(fVerbose > 1)
333  {
334    G4cout<<"PAIModel DeltaCutInKineticEnergyNow = "
335          <<fDeltaCutInKinEnergy/keV<<" keV"<<G4endl;
336  }
337  for (G4int i = 0 ; i <= fTotBin ; i++ )
338  {
339    G4double dNdxCut = GetdNdxCut(i,fDeltaCutInKinEnergy) ;
340    //G4cout << "i= " << i << " x= " << dNdxCut << G4endl;
341    if(dNdxCut < 0.0) dNdxCut = 0.0; 
342    //    G4double lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut ;
343    G4double lambda = DBL_MAX;
344    if(dNdxCut > 0.0) lambda = 1.0/dNdxCut;
345
346    fLambdaVector->PutValue(i, lambda) ;
347    fdNdxCutVector->PutValue(i, dNdxCut) ;
348  }
349}
350
351///////////////////////////////////////////////////////////////////////
352//
353// Returns integral PAI cross section for energy transfers >= transferCut
354
355G4double 
356G4PAIModel::GetdNdxCut( G4int iPlace, G4double transferCut)
357{ 
358  G4int iTransfer;
359  G4double x1, x2, y1, y2, dNdxCut;
360  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
361  // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength())
362  //           <<G4endl; 
363  for( iTransfer = 0 ; 
364       iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; 
365       iTransfer++)
366  {
367    if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
368    {
369      break ;
370    }
371  } 
372  if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) )
373  {
374      iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ;
375  }
376  y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ;
377  y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ;
378  if(y1 < 0.0) y1 = 0.0;
379  if(y2 < 0.0) y2 = 0.0;
380  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
381  x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
382  x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
383  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
384
385  if ( y1 == y2 )    dNdxCut = y2 ;
386  else
387  {
388    //  if ( x1 == x2  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
389    //    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
390    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*0.5 ;
391    else             dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
392  }
393  //  G4cout<<""<<dNdxCut<<G4endl;
394  if(dNdxCut < 0.0) dNdxCut = 0.0; 
395  return dNdxCut ;
396}
397///////////////////////////////////////////////////////////////////////
398//
399// Returns integral dEdx for energy transfers >= transferCut
400
401G4double 
402G4PAIModel::GetdEdxCut( G4int iPlace, G4double transferCut)
403{ 
404  G4int iTransfer;
405  G4double x1, x2, y1, y2, dEdxCut;
406  //G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
407  // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength())
408  //           <<G4endl; 
409  for( iTransfer = 0 ; 
410       iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; 
411       iTransfer++)
412  {
413    if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
414    {
415      break ;
416    }
417  } 
418  if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) )
419  {
420      iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ;
421  }
422  y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ;
423  y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ;
424  if(y1 < 0.0) y1 = 0.0;
425  if(y2 < 0.0) y2 = 0.0;
426  //G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
427  x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
428  x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
429  //G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
430
431  if ( y1 == y2 )    dEdxCut = y2 ;
432  else
433  {
434    //  if ( x1 == x2  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
435    //    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
436    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*0.5 ;
437    else             dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
438  }
439  //G4cout<<""<<dEdxCut<<G4endl;
440  if(dEdxCut < 0.0) dEdxCut = 0.0; 
441  return dEdxCut ;
442}
443
444//////////////////////////////////////////////////////////////////////////////
445
446G4double G4PAIModel::ComputeDEDXPerVolume(const G4Material*,
447                                          const G4ParticleDefinition* p,
448                                          G4double kineticEnergy,
449                                          G4double cutEnergy)
450{
451  G4int iTkin,iPlace;
452 
453  //G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
454  G4double cut = cutEnergy;
455
456  G4double massRatio  = fMass/p->GetPDGMass();
457  G4double scaledTkin = kineticEnergy*massRatio;
458  G4double charge     = p->GetPDGCharge();
459  G4double charge2    = charge*charge;
460  const G4MaterialCutsCouple* matCC = CurrentCouple();
461
462  size_t jMat = 0;
463  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
464  {
465    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
466  }
467  //G4cout << "jMat= " << jMat
468  //     << " jMax= " << fMaterialCutsCoupleVector.size()
469  //       << " matCC: " << matCC;
470  //if(matCC) G4cout << " mat: " << matCC->GetMaterial()->GetName();
471  //  G4cout << G4endl;
472  if(jMat == fMaterialCutsCoupleVector.size()) return 0.0;
473
474  fPAIdEdxTable = fPAIdEdxBank[jMat];
475  fdEdxVector = fdEdxTable[jMat];
476  for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++)
477  {
478    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ;   
479  }
480  //G4cout << "E= " << scaledTkin << " iTkin= " << iTkin
481  //     << "  " << fdEdxVector->GetVectorLength()<<G4endl;
482  iPlace = iTkin - 1;
483  if(iPlace < 0) iPlace = 0;
484  else if(iPlace >= fTotBin) iPlace = fTotBin-1;
485  G4double dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cut) );
486  if( dEdx < 0.) dEdx = 0.;
487  return dEdx;
488}
489
490/////////////////////////////////////////////////////////////////////////
491
492G4double G4PAIModel::CrossSectionPerVolume( const G4Material*,
493                                            const G4ParticleDefinition* p,
494                                            G4double kineticEnergy,
495                                            G4double cutEnergy,
496                                            G4double maxEnergy  ) 
497{
498  G4int iTkin,iPlace;
499  G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
500  if(tmax <= cutEnergy) return 0.0;
501  G4double massRatio  = fMass/p->GetPDGMass();
502  G4double scaledTkin = kineticEnergy*massRatio;
503  G4double charge     = p->GetPDGCharge();
504  G4double charge2    = charge*charge, cross, cross1, cross2;
505  const G4MaterialCutsCouple* matCC = CurrentCouple();
506
507  size_t jMat = 0;
508  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
509  {
510    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
511  }
512  if(jMat == fMaterialCutsCoupleVector.size()) return 0.0;
513
514  fPAItransferTable = fPAIxscBank[jMat];
515
516  for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++)
517  {
518    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ;   
519  }
520  iPlace = iTkin - 1;
521  if(iPlace < 0) iPlace = 0;
522  else if(iPlace >= fTotBin) iPlace = fTotBin-1; 
523
524  //G4cout<<"iPlace = "<<iPlace<<"; tmax = "
525  // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl; 
526  cross1 = GetdNdxCut(iPlace,tmax) ;
527  //G4cout<<"cross1 = "<<cross1<<G4endl; 
528  cross2 = GetdNdxCut(iPlace,cutEnergy) ; 
529  //G4cout<<"cross2 = "<<cross2<<G4endl; 
530  cross  = (cross2-cross1)*charge2;
531  //G4cout<<"cross = "<<cross<<G4endl; 
532  if( cross < DBL_MIN) cross = 0.0;
533  //  if( cross2 < DBL_MIN) cross2 = DBL_MIN;
534
535  // return cross2;
536  return cross;
537}
538
539///////////////////////////////////////////////////////////////////////////
540//
541// It is analog of PostStepDoIt in terms of secondary electron.
542//
543 
544void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
545                                   const G4MaterialCutsCouple* matCC,
546                                   const G4DynamicParticle* dp,
547                                   G4double tmin,
548                                   G4double maxEnergy)
549{
550  size_t jMat = 0;
551  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
552  {
553    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
554  }
555  if(jMat == fMaterialCutsCoupleVector.size()) return;
556
557  fPAItransferTable = fPAIxscBank[jMat];
558  fdNdxCutVector    = fdNdxCutTable[jMat];
559
560  G4double tmax = std::min(MaxSecondaryKinEnergy(dp), maxEnergy);
561  if( tmin >= tmax && fVerbose > 0)
562  {
563    G4cout<<"G4PAIModel::SampleSecondary: tmin >= tmax "<<G4endl;
564  }
565  G4ThreeVector direction= dp->GetMomentumDirection();
566  G4double particleMass  = dp->GetMass();
567  G4double kineticEnergy = dp->GetKineticEnergy();
568
569  G4double massRatio     = fMass/particleMass;
570  G4double scaledTkin    = kineticEnergy*massRatio;
571  G4double totalEnergy   = kineticEnergy + particleMass;
572  G4double pSquare       = kineticEnergy*(totalEnergy+particleMass);
573 
574  G4double deltaTkin     = GetPostStepTransfer(scaledTkin);
575
576  // G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV<<" keV "<<G4endl;
577
578  if( deltaTkin <= 0. && fVerbose > 0) 
579  {
580    G4cout<<"G4PAIModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl;
581  }
582  if( deltaTkin <= 0.) return;
583
584  if( deltaTkin > tmax) deltaTkin = tmax;
585
586  G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 ));
587  G4double totalMomentum      = sqrt(pSquare);
588  G4double costheta           = deltaTkin*(totalEnergy + electron_mass_c2)
589                                /(deltaTotalMomentum * totalMomentum);
590
591  if( costheta > 0.99999 ) costheta = 0.99999;
592  G4double sintheta = 0.0;
593  G4double sin2 = 1. - costheta*costheta;
594  if( sin2 > 0.) sintheta = sqrt(sin2);
595
596  //  direction of the delta electron
597  G4double phi  = twopi*G4UniformRand(); 
598  G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta;
599
600  G4ThreeVector deltaDirection(dirx,diry,dirz);
601  deltaDirection.rotateUz(direction);
602  deltaDirection.unit();
603
604  // primary change
605  kineticEnergy -= deltaTkin;
606  G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection;
607  direction = dir.unit();
608  fParticleChange->SetProposedKineticEnergy(kineticEnergy);
609  fParticleChange->SetProposedMomentumDirection(direction);
610
611  // create G4DynamicParticle object for e- delta ray
612  G4DynamicParticle* deltaRay = new G4DynamicParticle;
613  deltaRay->SetDefinition(G4Electron::Electron());
614  deltaRay->SetKineticEnergy( deltaTkin );  //  !!! trick for last steps /2.0 ???
615  deltaRay->SetMomentumDirection(deltaDirection); 
616
617  vdp->push_back(deltaRay);
618}
619
620
621///////////////////////////////////////////////////////////////////////
622//
623// Returns post step PAI energy transfer > cut electron energy according to passed
624// scaled kinetic energy of particle
625
626G4double 
627G4PAIModel::GetPostStepTransfer( G4double scaledTkin )
628{ 
629  // G4cout<<"G4PAIModel::GetPostStepTransfer"<<G4endl ;
630
631  G4int iTkin, iTransfer, iPlace  ;
632  G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ;
633
634  for(iTkin=0;iTkin<=fTotBin;iTkin++)
635  {
636    if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin))  break ;
637  }
638  iPlace = iTkin - 1 ;
639  // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ;
640  if(iPlace < 0) iPlace = 0;
641  else if(iPlace >= fTotBin) iPlace = fTotBin-1; 
642  dNdxCut1 = (*fdNdxCutVector)(iPlace) ; 
643  // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ;
644
645
646  if(iTkin == fTotBin) // Fermi plato, try from left
647  {
648      position = dNdxCut1*G4UniformRand() ;
649
650      for( iTransfer = 0;
651 iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
652      {
653        if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ;
654      }
655      transfer = GetEnergyTransfer(iPlace,position,iTransfer);
656  }
657  else
658  {
659    dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; 
660    // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ;
661    if(iTkin == 0) // Tkin is too small, trying from right only
662    {
663      position = dNdxCut2*G4UniformRand() ;
664
665      for( iTransfer = 0;
666  iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
667      {
668        if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ;
669      }
670      transfer = GetEnergyTransfer(iPlace+1,position,iTransfer);
671    } 
672    else // general case: Tkin between two vectors of the material
673    {
674      E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
675      E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin)     ;
676      W  = 1.0/(E2 - E1) ;
677      W1 = (E2 - scaledTkin)*W ;
678      W2 = (scaledTkin - E1)*W ;
679
680      position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ;
681
682        // G4cout<<position<<"\t" ;
683
684      G4int iTrMax1, iTrMax2, iTrMax;
685
686      iTrMax1 = G4int((*fPAItransferTable)(iPlace)->GetVectorLength());
687      iTrMax2 = G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength());
688
689      if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2;
690      else                    iTrMax = iTrMax1;
691
692
693      for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ )
694      {
695          if( position >=
696          ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 +
697            (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) break ;
698      }
699      transfer = GetEnergyTransfer(iPlace,position,iTransfer);
700    }
701  } 
702  // G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ;
703  if(transfer < 0.0 ) transfer = 0.0 ;
704  // if(transfer < DBL_MIN ) transfer = DBL_MIN;
705
706  return transfer ;
707}
708
709///////////////////////////////////////////////////////////////////////
710//
711// Returns random PAI energy transfer according to passed
712// indexes of particle kinetic
713
714G4double
715G4PAIModel::GetEnergyTransfer( G4int iPlace, G4double position, G4int iTransfer )
716{ 
717  G4int iTransferMax;
718  G4double x1, x2, y1, y2, energyTransfer;
719
720  if(iTransfer == 0)
721  {
722    energyTransfer = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
723  } 
724  else
725  {
726    iTransferMax = G4int((*fPAItransferTable)(iPlace)->GetVectorLength());
727
728    if ( iTransfer >= iTransferMax )  iTransfer = iTransferMax - 1;
729   
730    y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1);
731    y2 = (*(*fPAItransferTable)(iPlace))(iTransfer);
732
733    x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1);
734    x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
735
736    if ( x1 == x2 )    energyTransfer = x2;
737    else
738    {
739      if ( y1 == y2  ) energyTransfer = x1 + (x2 - x1)*G4UniformRand();
740      else
741      {
742        energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1);
743      }
744    }
745  }
746  return energyTransfer;
747}
748
749///////////////////////////////////////////////////////////////////////
750
751G4double G4PAIModel::SampleFluctuations( const G4Material* material,
752                                         const G4DynamicParticle* aParticle,
753                                               G4double&,
754                                               G4double& step,
755                                               G4double&)
756{
757  size_t jMat = 0;
758  for(;jMat < fMaterialCutsCoupleVector.size(); ++jMat )
759  {
760    if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break;
761  }
762  if(jMat == fMaterialCutsCoupleVector.size()) return 0.0;
763
764  fPAItransferTable = fPAIxscBank[jMat];
765  fdNdxCutVector   = fdNdxCutTable[jMat];
766
767  G4int iTkin, iTransfer, iPlace;
768  G4long numOfCollisions=0;
769
770  //G4cout<<"G4PAIModel::SampleFluctuations"<<G4endl ;
771  //G4cout<<"in: "<<fMaterialCutsCoupleVector[jMat]->GetMaterial()->GetName()<<G4endl;
772  G4double loss = 0.0, charge2 ;
773  G4double stepSum = 0., stepDelta, lambda, omega; 
774  G4double position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber;
775  G4bool numb = true;
776  G4double Tkin       = aParticle->GetKineticEnergy() ;
777  G4double MassRatio  = fMass/aParticle->GetDefinition()->GetPDGMass() ;
778  G4double charge     = aParticle->GetDefinition()->GetPDGCharge() ;
779  charge2             = charge*charge ;
780  G4double TkinScaled = Tkin*MassRatio ;
781
782  for(iTkin=0;iTkin<=fTotBin;iTkin++)
783  {
784    if(TkinScaled < fParticleEnergyVector->GetLowEdgeEnergy(iTkin))   break ;
785  }
786  iPlace = iTkin - 1 ; 
787  if(iPlace < 0) iPlace = 0;
788  else if(iPlace >= fTotBin) iPlace = fTotBin - 1;
789  //G4cout<<"from search, iPlace = "<<iPlace<<G4endl ;
790  dNdxCut1 = (*fdNdxCutVector)(iPlace) ; 
791  //G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ;
792
793  if(iTkin == fTotBin) // Fermi plato, try from left
794  {
795    meanNumber =((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*step*charge2;
796    if(meanNumber < 0.) meanNumber = 0. ;
797    //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
798    // numOfCollisions = G4Poisson(meanNumber) ;
799    if( meanNumber > 0.) lambda = step/meanNumber;
800    else                 lambda = DBL_MAX;
801    while(numb)
802    {
803     stepDelta = CLHEP::RandExponential::shoot(lambda);
804     stepSum += stepDelta;
805     if(stepSum >= step) break;
806     numOfCollisions++;
807    }   
808    //G4cout<<"##1 numOfCollisions = "<<numOfCollisions<<G4endl ;
809
810    while(numOfCollisions)
811    {
812      position = dNdxCut1+
813                 ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*G4UniformRand() ;
814
815      for( iTransfer = 0;
816   iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
817      {
818        if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ;
819      }
820      omega = GetEnergyTransfer(iPlace,position,iTransfer);
821      //G4cout<<"G4PAIModel::SampleFluctuations, omega = "<<omega/keV<<" keV; "<<"\t";
822      loss += omega;
823      numOfCollisions-- ;
824    }
825  }
826  else
827  {
828    dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; 
829    //G4cout<<"dNdxCut2 = "<<dNdxCut2<< " iTkin= "<<iTkin<<" iPlace= "<<iPlace<<G4endl;
830 
831    if(iTkin == 0) // Tkin is too small, trying from right only
832    {
833      meanNumber =((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*step*charge2;
834      if( meanNumber < 0. ) meanNumber = 0. ;
835      //  numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
836      //  numOfCollisions = G4Poisson(meanNumber) ;
837      if( meanNumber > 0.) lambda = step/meanNumber;
838      else                 lambda = DBL_MAX;
839      while(numb)
840        {
841          stepDelta = CLHEP::RandExponential::shoot(lambda);
842          stepSum += stepDelta;
843          if(stepSum >= step) break;
844          numOfCollisions++;
845        }   
846
847      //G4cout<<"##2 numOfCollisions = "<<numOfCollisions<<G4endl ;
848
849      while(numOfCollisions)
850      {
851        position = dNdxCut2+
852                   ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*G4UniformRand();
853   
854        for( iTransfer = 0;
855   iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
856        {
857          if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ;
858        }
859        omega = GetEnergyTransfer(iPlace,position,iTransfer);
860        //G4cout<<omega/keV<<"\t";
861        loss += omega;
862        numOfCollisions-- ;
863      }
864    } 
865    else // general case: Tkin between two vectors of the material
866    {
867      E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
868      E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin)     ;
869       W = 1.0/(E2 - E1) ;
870      W1 = (E2 - TkinScaled)*W ;
871      W2 = (TkinScaled - E1)*W ;
872
873      //G4cout << fPAItransferTable->size() << G4endl;
874      //G4cout<<"(*(*fPAItransferTable)(iPlace))(0) = "<<
875      //   (*(*fPAItransferTable)(iPlace))(0)<<G4endl ;
876      //G4cout<<"(*(*fPAItransferTable)(iPlace+1))(0) = "<<
877      //     (*(*fPAItransferTable)(iPlace+1))(0)<<G4endl ;
878
879      meanNumber=( ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*W1 + 
880                   ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*W2 )*step*charge2;
881      if(meanNumber<0.0) meanNumber = 0.0;
882      //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
883      // numOfCollisions = G4Poisson(meanNumber) ;
884      if( meanNumber > 0.) lambda = step/meanNumber;
885      else                 lambda = DBL_MAX;
886      while(numb)
887        {
888          stepDelta = CLHEP::RandExponential::shoot(lambda);
889          stepSum += stepDelta;
890          if(stepSum >= step) break;
891          numOfCollisions++;
892        }   
893
894      //G4cout<<"##3 numOfCollisions = "<<numOfCollisions<<endl ;
895
896      while(numOfCollisions)
897      {
898        position = dNdxCut1*W1 + dNdxCut2*W2 +
899                 ( ( (*(*fPAItransferTable)(iPlace))(0)-dNdxCut1 )*W1 + 
900                    dNdxCut2+
901                  ( (*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2 )*W2 )*G4UniformRand();
902
903        // G4cout<<position<<"\t" ;
904
905        for( iTransfer = 0;
906    iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ )
907        {
908          if( position >=
909          ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + 
910            (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) )
911          {
912              break ;
913          }
914        }
915        omega =  GetEnergyTransfer(iPlace,position,iTransfer);
916        //  G4cout<<omega/keV<<"\t";
917        loss += omega;
918        numOfCollisions-- ;   
919      }
920    }
921  } 
922  //G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = "
923  //  <<step/mm<<" mm"<<G4endl ;
924  if(loss > Tkin) loss=Tkin;
925  if(loss < 0.  ) loss = 0.;
926  return loss ;
927
928}
929
930//////////////////////////////////////////////////////////////////////
931//
932// Returns the statistical estimation of the energy loss distribution variance
933//
934
935
936G4double G4PAIModel::Dispersion( const G4Material* material, 
937                                 const G4DynamicParticle* aParticle,
938                                       G4double& tmax, 
939                                       G4double& step       )
940{
941  G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.;
942  for(G4int i = 0 ; i < fMeanNumber; i++)
943  {
944    loss      = SampleFluctuations(material,aParticle,tmax,step,meanLoss);
945    sumLoss  += loss;
946    sumLoss2 += loss*loss;
947  }
948  meanLoss = sumLoss/fMeanNumber;
949  sigma2   = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber;
950  return sigma2;
951}
952
953/////////////////////////////////////////////////////////////////////
954
955G4double G4PAIModel::MaxSecondaryEnergy( const G4ParticleDefinition* p,
956                                         G4double kinEnergy) 
957{
958  G4double tmax = kinEnergy;
959  if(p == fElectron) tmax *= 0.5;
960  else if(p != fPositron) { 
961    G4double mass = p->GetPDGMass();
962    G4double ratio= electron_mass_c2/mass;
963    G4double gamma= kinEnergy/mass + 1.0;
964    tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
965                  (1. + 2.0*gamma*ratio + ratio*ratio);
966  }
967  return tmax;
968}
969
970///////////////////////////////////////////////////////////////
971
972void G4PAIModel::DefineForRegion(const G4Region* r) 
973{
974  fPAIRegionVector.push_back(r);
975}
976
977//
978//
979/////////////////////////////////////////////////
980
981
982
983
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985
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