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25//
26// $Id: G4PAIPhotonModel.cc,v 1.25 2010/10/26 09:16:50 vnivanch Exp $
27// GEANT4 tag $Name: emstand-V09-03-24 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class
32// File name:     G4PAIPhotonModel.cc
33//
34// Author: Vladimir.Grichine@cern.ch based on G4PAIModel class
35//
36// Creation date: 20.05.2004
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// 11.04.05 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 "G4PAIxSection.hh"
54
55#include "G4PAIPhotonModel.hh"
56#include "Randomize.hh"
57#include "G4Electron.hh"
58#include "G4Positron.hh"
59#include "G4Gamma.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#include "G4GeometryTolerance.hh"
67
68////////////////////////////////////////////////////////////////////////
69
70using namespace std;
71
72G4PAIPhotonModel::G4PAIPhotonModel(const G4ParticleDefinition* p, const G4String& nam)
73  : G4VEmModel(nam),G4VEmFluctuationModel(nam),
74  fLowestKineticEnergy(10.0*keV),
75  fHighestKineticEnergy(100.*TeV),
76  fTotBin(200),
77  fMeanNumber(20),
78  fParticle(0),
79  fHighKinEnergy(100.*TeV),
80  fLowKinEnergy(2.0*MeV),
81  fTwoln10(2.0*log(10.0)),
82  fBg2lim(0.0169),
83  fTaulim(8.4146e-3)
84{
85  fVerbose  = 0;
86  fElectron = G4Electron::Electron();
87  fPositron = G4Positron::Positron();
88
89  fProtonEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
90                                               fHighestKineticEnergy,
91                                               fTotBin);
92  fPAItransferTable     = 0;
93  fPAIphotonTable       = 0;
94  fPAIplasmonTable      = 0;
95
96  fPAIdEdxTable         = 0;
97  fSandiaPhotoAbsCof    = 0;
98  fdEdxVector           = 0;
99
100  fLambdaVector         = 0;
101  fdNdxCutVector        = 0;
102  fdNdxCutPhotonVector  = 0;
103  fdNdxCutPlasmonVector = 0;
104
105  fSandiaIntervalNumber = 0;
106  fMatIndex = 0;
107
108  if(p) { SetParticle(p); }
109  else  { SetParticle(fElectron); }
110
111  isInitialised      = false;
112}
113
114////////////////////////////////////////////////////////////////////////////
115
116G4PAIPhotonModel::~G4PAIPhotonModel()
117{
118  if(fProtonEnergyVector) delete fProtonEnergyVector;
119  if(fdEdxVector)         delete fdEdxVector ;
120  if ( fLambdaVector)     delete fLambdaVector;
121  if ( fdNdxCutVector)    delete fdNdxCutVector;
122
123  if( fPAItransferTable )
124  {
125        fPAItransferTable->clearAndDestroy();
126        delete fPAItransferTable ;
127  }
128  if( fPAIphotonTable )
129  {
130        fPAIphotonTable->clearAndDestroy();
131        delete fPAIphotonTable ;
132  }
133  if( fPAIplasmonTable )
134  {
135        fPAIplasmonTable->clearAndDestroy();
136        delete fPAIplasmonTable ;
137  }
138  if(fSandiaPhotoAbsCof)
139  {
140    for(G4int i=0;i<fSandiaIntervalNumber;i++)
141    {
142        delete[] fSandiaPhotoAbsCof[i];
143    }
144    delete[] fSandiaPhotoAbsCof;
145  }
146}
147
148///////////////////////////////////////////////////////////////////////////////
149
150void G4PAIPhotonModel::SetParticle(const G4ParticleDefinition* p)
151{
152  fParticle = p;
153  fMass = fParticle->GetPDGMass();
154  fSpin = fParticle->GetPDGSpin();
155  G4double q = fParticle->GetPDGCharge()/eplus;
156  fChargeSquare = q*q;
157  fLowKinEnergy *= fMass/proton_mass_c2;
158  fRatio = electron_mass_c2/fMass;
159  fQc = fMass/fRatio;
160}
161
162////////////////////////////////////////////////////////////////////////////
163
164void G4PAIPhotonModel::Initialise(const G4ParticleDefinition* p,
165                                   const G4DataVector&)
166{
167  //  G4cout<<"G4PAIPhotonModel::Initialise for "<<p->GetParticleName()<<G4endl;
168  if(isInitialised) { return; }
169  isInitialised = true;
170
171  if(!fParticle) SetParticle(p);
172
173  fParticleChange = GetParticleChangeForLoss();
174
175  const G4ProductionCutsTable* theCoupleTable =
176        G4ProductionCutsTable::GetProductionCutsTable();
177
178  for(size_t iReg = 0; iReg < fPAIRegionVector.size();++iReg) // region loop
179  {
180    const G4Region* curReg = fPAIRegionVector[iReg];
181
182    vector<G4Material*>::const_iterator matIter = curReg->GetMaterialIterator();
183    size_t jMat; 
184    size_t numOfMat = curReg->GetNumberOfMaterials();
185
186    //  for(size_t jMat = 0; jMat < curReg->GetNumberOfMaterials();++jMat){}
187    const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
188    size_t numberOfMat = G4Material::GetNumberOfMaterials();
189
190    for(jMat = 0 ; jMat < numOfMat; ++jMat) // region material loop
191    {
192      const G4MaterialCutsCouple* matCouple = theCoupleTable->
193      GetMaterialCutsCouple( *matIter, curReg->GetProductionCuts() );
194      fMaterialCutsCoupleVector.push_back(matCouple);
195
196      size_t iMatGlob;
197      for(iMatGlob = 0 ; iMatGlob < numberOfMat ; iMatGlob++ )
198      {
199        if( *matIter == (*theMaterialTable)[iMatGlob]) break ;
200      }
201      fMatIndex = iMatGlob;
202
203      ComputeSandiaPhotoAbsCof();
204      BuildPAIonisationTable();
205
206      fPAIxscBank.push_back(fPAItransferTable);
207      fPAIphotonBank.push_back(fPAIphotonTable);
208      fPAIplasmonBank.push_back(fPAIplasmonTable);
209      fPAIdEdxBank.push_back(fPAIdEdxTable);
210      fdEdxTable.push_back(fdEdxVector);
211
212      BuildLambdaVector(matCouple);
213
214      fdNdxCutTable.push_back(fdNdxCutVector);
215      fdNdxCutPhotonTable.push_back(fdNdxCutPhotonVector);
216      fdNdxCutPlasmonTable.push_back(fdNdxCutPlasmonVector);
217      fLambdaTable.push_back(fLambdaVector);
218
219
220      matIter++;
221    }
222  }
223}
224
225//////////////////////////////////////////////////////////////////
226
227void G4PAIPhotonModel::InitialiseMe(const G4ParticleDefinition*)
228{}
229
230//////////////////////////////////////////////////////////////////
231
232void G4PAIPhotonModel::ComputeSandiaPhotoAbsCof()
233{
234  G4int i, j, numberOfElements ;
235  const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
236
237  G4SandiaTable thisMaterialSandiaTable(fMatIndex) ;
238  numberOfElements = (*theMaterialTable)[fMatIndex]->
239                                              GetNumberOfElements();
240  G4int* thisMaterialZ = new G4int[numberOfElements] ;
241
242  for(i=0;i<numberOfElements;i++) 
243  {
244    thisMaterialZ[i] = 
245    (G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ;
246  } 
247  fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals
248                           (thisMaterialZ,numberOfElements) ;
249
250  fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing
251                           ( thisMaterialZ ,
252                             (*theMaterialTable)[fMatIndex]->GetFractionVector() ,
253                             numberOfElements,fSandiaIntervalNumber) ;
254   
255  fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ;
256
257  for(i=0;i<fSandiaIntervalNumber;i++)  fSandiaPhotoAbsCof[i] = new G4double[5] ;
258   
259  for( i = 0 ; i < fSandiaIntervalNumber ; i++ )
260  {
261    fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0) ; 
262
263    for( j = 1; j < 5 ; j++ )
264    {
265      fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable.
266                                      GetPhotoAbsorpCof(i+1,j)*
267                 (*theMaterialTable)[fMatIndex]->GetDensity() ;
268    }
269  }
270  delete[] thisMaterialZ ;
271}
272
273////////////////////////////////////////////////////////////////////////////
274//
275// Build tables for the ionization energy loss
276//  the tables are built for MATERIALS
277//                           *********
278
279void
280G4PAIPhotonModel::BuildPAIonisationTable()
281{
282  G4double LowEdgeEnergy , ionloss ;
283  G4double massRatio, tau, Tmax, Tmin, Tkin, deltaLow, gamma, bg2 ;
284  /*
285  if( fPAItransferTable )
286  {
287     fPAItransferTable->clearAndDestroy() ;
288     delete fPAItransferTable ;
289  }
290  */
291  fPAItransferTable = new G4PhysicsTable(fTotBin);
292  /*
293  if( fPAIratioTable )
294  {
295     fPAIratioTable->clearAndDestroy() ;
296     delete fPAIratioTable ;
297  }
298  */
299  fPAIphotonTable = new G4PhysicsTable(fTotBin);
300  fPAIplasmonTable = new G4PhysicsTable(fTotBin);
301  /*
302  if( fPAIdEdxTable )
303  {
304     fPAIdEdxTable->clearAndDestroy() ;
305     delete fPAIdEdxTable ;
306  }
307  */
308  fPAIdEdxTable = new G4PhysicsTable(fTotBin);
309
310  //  if(fdEdxVector) delete fdEdxVector ;
311  fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy,
312                                         fHighestKineticEnergy,
313                                         fTotBin               ) ;
314  Tmin     = fSandiaPhotoAbsCof[0][0] ;      // low energy Sandia interval
315  deltaLow = 100.*eV; // 0.5*eV ;
316
317  for (G4int i = 0 ; i <= fTotBin ; i++)  //The loop for the kinetic energy
318  {
319    LowEdgeEnergy = fProtonEnergyVector->GetLowEdgeEnergy(i) ;
320    tau = LowEdgeEnergy/proton_mass_c2 ;
321    //    if(tau < 0.01)  tau = 0.01 ;
322    gamma = tau +1. ;
323    // G4cout<<"gamma = "<<gamma<<endl ;
324    bg2 = tau*(tau + 2. ) ;
325    massRatio = electron_mass_c2/proton_mass_c2 ;
326    Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); 
327    // G4cout<<"proton Tkin = "<<LowEdgeEnergy/MeV<<" MeV"
328    // <<" Tmax = "<<Tmax/MeV<<" MeV"<<G4endl;
329    // Tkin = DeltaCutInKineticEnergyNow ;
330
331    // if ( DeltaCutInKineticEnergyNow > Tmax)         // was <
332    Tkin = Tmax ;
333    if ( Tkin < Tmin + deltaLow )  // low energy safety
334    {
335      Tkin = Tmin + deltaLow ;
336    }
337    G4PAIxSection protonPAI( fMatIndex,
338                             Tkin,
339                             bg2,
340                             fSandiaPhotoAbsCof,
341                             fSandiaIntervalNumber  ) ;
342
343
344    // G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ;
345    // G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ;
346    // G4cout<<"protonPAI.GetSplineSize() = "<<
347    //    protonPAI.GetSplineSize()<<G4endl<<G4endl ;
348
349    G4PhysicsFreeVector* transferVector = new
350                             G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
351    G4PhysicsFreeVector* photonVector = new
352                             G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
353    G4PhysicsFreeVector* plasmonVector = new
354                             G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
355    G4PhysicsFreeVector* dEdxVector = new
356                             G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
357
358    for( G4int k = 0 ; k < protonPAI.GetSplineSize() ; k++ )
359    {
360      transferVector->PutValue( k ,
361                                protonPAI.GetSplineEnergy(k+1),
362                                protonPAI.GetIntegralPAIxSection(k+1) ) ;
363      photonVector->PutValue( k ,
364                                protonPAI.GetSplineEnergy(k+1),
365                                protonPAI.GetIntegralCerenkov(k+1) ) ;
366      plasmonVector->PutValue( k ,
367                                protonPAI.GetSplineEnergy(k+1),
368                                protonPAI.GetIntegralPlasmon(k+1) ) ;
369      dEdxVector->PutValue( k ,
370                                protonPAI.GetSplineEnergy(k+1),
371                                protonPAI.GetIntegralPAIdEdx(k+1) ) ;
372    }
373    ionloss = protonPAI.GetMeanEnergyLoss() ;   //  total <dE/dx>
374    if ( ionloss <= 0.)  ionloss = DBL_MIN ;
375    fdEdxVector->PutValue(i,ionloss) ;
376
377    fPAItransferTable->insertAt(i,transferVector) ;
378    fPAIphotonTable->insertAt(i,photonVector) ;
379    fPAIplasmonTable->insertAt(i,plasmonVector) ;
380    fPAIdEdxTable->insertAt(i,dEdxVector) ;
381
382  }                                        // end of Tkin loop
383  //  theLossTable->insert(fdEdxVector);
384  // end of material loop
385  // G4cout<<"G4PAIonisation::BuildPAIonisationTable() have been called"<<G4endl ;
386  // G4cout<<"G4PAIonisation::BuildLossTable() have been called"<<G4endl ;
387}
388
389///////////////////////////////////////////////////////////////////////
390//
391// Build mean free path tables for the delta ray production process
392//     tables are built for MATERIALS
393//
394
395void
396G4PAIPhotonModel::BuildLambdaVector(const G4MaterialCutsCouple* matCutsCouple)
397{
398  G4int i ;
399  G4double dNdxCut,dNdxPhotonCut,dNdxPlasmonCut, lambda;
400  G4double kCarTolerance = G4GeometryTolerance::GetInstance()
401                           ->GetSurfaceTolerance();
402
403  const G4ProductionCutsTable* theCoupleTable=
404        G4ProductionCutsTable::GetProductionCutsTable();
405
406  size_t numOfCouples = theCoupleTable->GetTableSize();
407  size_t jMatCC;
408
409  for (jMatCC = 0 ; jMatCC < numOfCouples ; jMatCC++ )
410  {
411    if( matCutsCouple == theCoupleTable->GetMaterialCutsCouple(jMatCC) ) break;
412  }
413  if( jMatCC == numOfCouples && jMatCC > 0 ) jMatCC--;
414
415  const vector<G4double>*  deltaCutInKineticEnergy = theCoupleTable->
416                                GetEnergyCutsVector(idxG4ElectronCut);
417  const vector<G4double>*  photonCutInKineticEnergy = theCoupleTable->
418                                GetEnergyCutsVector(idxG4GammaCut);
419
420  if (fLambdaVector)         delete fLambdaVector;
421  if (fdNdxCutVector)        delete fdNdxCutVector;
422  if (fdNdxCutPhotonVector)  delete fdNdxCutPhotonVector;
423  if (fdNdxCutPlasmonVector) delete fdNdxCutPlasmonVector;
424
425  fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy,
426                                          fHighestKineticEnergy,
427                                          fTotBin                );
428  fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy,
429                                          fHighestKineticEnergy,
430                                          fTotBin                );
431  fdNdxCutPhotonVector = new G4PhysicsLogVector( fLowestKineticEnergy,
432                                          fHighestKineticEnergy,
433                                          fTotBin                );
434  fdNdxCutPlasmonVector = new G4PhysicsLogVector( fLowestKineticEnergy,
435                                          fHighestKineticEnergy,
436                                          fTotBin                );
437
438  G4double deltaCutInKineticEnergyNow  = (*deltaCutInKineticEnergy)[jMatCC];
439  G4double photonCutInKineticEnergyNow = (*photonCutInKineticEnergy)[jMatCC];
440
441  if(fVerbose > 0)
442  {
443    G4cout<<"PAIPhotonModel deltaCutInKineticEnergyNow = "
444          <<deltaCutInKineticEnergyNow/keV<<" keV"<<G4endl;
445    G4cout<<"PAIPhotonModel photonCutInKineticEnergyNow = "
446          <<photonCutInKineticEnergyNow/keV<<" keV"<<G4endl;
447  }
448  for ( i = 0 ; i <= fTotBin ; i++ )
449  {
450    dNdxPhotonCut  = GetdNdxPhotonCut(i,photonCutInKineticEnergyNow);
451    dNdxPlasmonCut = GetdNdxPlasmonCut(i,deltaCutInKineticEnergyNow);
452
453    dNdxCut        =  dNdxPhotonCut + dNdxPlasmonCut;
454    lambda         = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut;
455
456    if (lambda <= 1000*kCarTolerance) lambda = 1000*kCarTolerance; // Mmm ???
457
458    fLambdaVector->PutValue(i, lambda);
459
460    fdNdxCutVector->PutValue(i, dNdxCut);
461    fdNdxCutPhotonVector->PutValue(i, dNdxPhotonCut);
462    fdNdxCutPlasmonVector->PutValue(i, dNdxPlasmonCut);
463  }
464}
465
466///////////////////////////////////////////////////////////////////////
467//
468// Returns integral PAI cross section for energy transfers >= transferCut
469
470G4double 
471G4PAIPhotonModel::GetdNdxCut( G4int iPlace, G4double transferCut)
472{ 
473  G4int iTransfer;
474  G4double x1, x2, y1, y2, dNdxCut;
475  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
476  // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength())
477  //           <<G4endl; 
478  for( iTransfer = 0 ; 
479       iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; 
480       iTransfer++)
481  {
482    if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
483    {
484      break ;
485    }
486  } 
487  if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) )
488  {
489      iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ;
490  }
491  y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ;
492  y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ;
493  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
494  x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
495  x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
496  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
497
498  if ( y1 == y2 )    dNdxCut = y2 ;
499  else
500  {
501    //  if ( x1 == x2  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
502    //    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
503    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*0.5 ;
504    else             dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
505  }
506  //  G4cout<<""<<dNdxCut<<G4endl;
507  return dNdxCut ;
508}
509
510///////////////////////////////////////////////////////////////////////
511//
512// Returns integral PAI cherenkovcross section for energy transfers >= transferCut
513
514G4double 
515G4PAIPhotonModel::GetdNdxPhotonCut( G4int iPlace, G4double transferCut)
516{ 
517  G4int iTransfer;
518  G4double x1, x2, y1, y2, dNdxCut;
519  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
520  // G4cout<<"size = "<<G4int((*fPAIphotonTable)(iPlace)->GetVectorLength())
521  //           <<G4endl; 
522  for( iTransfer = 0 ; 
523       iTransfer < G4int((*fPAIphotonTable)(iPlace)->GetVectorLength()) ; 
524       iTransfer++)
525  {
526    if(transferCut <= (*fPAIphotonTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
527    {
528      break ;
529    }
530  } 
531  if ( iTransfer >= G4int((*fPAIphotonTable)(iPlace)->GetVectorLength()) )
532  {
533      iTransfer = (*fPAIphotonTable)(iPlace)->GetVectorLength() - 1 ;
534  }
535  y1 = (*(*fPAIphotonTable)(iPlace))(iTransfer-1) ;
536  y2 = (*(*fPAIphotonTable)(iPlace))(iTransfer) ;
537  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
538  x1 = (*fPAIphotonTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
539  x2 = (*fPAIphotonTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
540  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
541
542  if ( y1 == y2 )    dNdxCut = y2 ;
543  else
544  {
545    //  if ( x1 == x2  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
546    //    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
547    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*0.5 ;
548    else             dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
549  }
550  //  G4cout<<""<<dNdxPhotonCut<<G4endl;
551  return dNdxCut ;
552}
553
554///////////////////////////////////////////////////////////////////////
555//
556// Returns integral PAI cross section for energy transfers >= transferCut
557
558G4double 
559G4PAIPhotonModel::GetdNdxPlasmonCut( G4int iPlace, G4double transferCut)
560{ 
561  G4int iTransfer;
562  G4double x1, x2, y1, y2, dNdxCut;
563
564  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
565  // G4cout<<"size = "<<G4int((*fPAIPlasmonTable)(iPlace)->GetVectorLength())
566  //           <<G4endl; 
567  for( iTransfer = 0 ; 
568       iTransfer < G4int((*fPAIplasmonTable)(iPlace)->GetVectorLength()) ; 
569       iTransfer++)
570  {
571    if(transferCut <= (*fPAIplasmonTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
572    {
573      break ;
574    }
575  } 
576  if ( iTransfer >= G4int((*fPAIplasmonTable)(iPlace)->GetVectorLength()) )
577  {
578      iTransfer = (*fPAIplasmonTable)(iPlace)->GetVectorLength() - 1 ;
579  }
580  y1 = (*(*fPAIplasmonTable)(iPlace))(iTransfer-1) ;
581  y2 = (*(*fPAIplasmonTable)(iPlace))(iTransfer) ;
582  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
583  x1 = (*fPAIplasmonTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
584  x2 = (*fPAIplasmonTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
585  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
586
587  if ( y1 == y2 )    dNdxCut = y2 ;
588  else
589  {
590    //  if ( x1 == x2  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
591    //    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
592    if ( std::abs(x1-x2) <= eV  ) dNdxCut = y1 + (y2 - y1)*0.5 ;
593    else             dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
594  }
595  //  G4cout<<""<<dNdxPlasmonCut<<G4endl;
596  return dNdxCut ;
597}
598
599///////////////////////////////////////////////////////////////////////
600//
601// Returns integral dEdx for energy transfers >= transferCut
602
603G4double 
604G4PAIPhotonModel::GetdEdxCut( G4int iPlace, G4double transferCut)
605{ 
606  G4int iTransfer;
607  G4double x1, x2, y1, y2, dEdxCut;
608  // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
609  // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength())
610  //           <<G4endl; 
611  for( iTransfer = 0 ; 
612       iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; 
613       iTransfer++)
614  {
615    if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
616    {
617      break ;
618    }
619  } 
620  if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) )
621  {
622      iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ;
623  }
624  y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ;
625  y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ;
626  // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
627  x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
628  x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
629  // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
630
631  if ( y1 == y2 )    dEdxCut = y2 ;
632  else
633  {
634    //  if ( x1 == x2  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
635    //    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
636    if ( std::abs(x1-x2) <= eV  ) dEdxCut = y1 + (y2 - y1)*0.5 ;
637    else             dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;     
638  }
639  //  G4cout<<""<<dEdxCut<<G4endl;
640  return dEdxCut ;
641}
642
643//////////////////////////////////////////////////////////////////////////////
644
645G4double G4PAIPhotonModel::ComputeDEDXPerVolume(const G4Material*,
646                                                const G4ParticleDefinition* p,
647                                                G4double kineticEnergy,
648                                                G4double cutEnergy)
649{
650  G4int iTkin,iPlace;
651  size_t jMat;
652
653  //G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
654  G4double cut = cutEnergy;
655
656  G4double particleMass = p->GetPDGMass();
657  G4double scaledTkin   = kineticEnergy*proton_mass_c2/particleMass;
658  G4double charge       = p->GetPDGCharge()/eplus;
659  G4double charge2      = charge*charge;
660  G4double dEdx         = 0.;
661  const G4MaterialCutsCouple* matCC = CurrentCouple();
662
663  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
664  {
665    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
666  }
667  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
668
669  fPAIdEdxTable = fPAIdEdxBank[jMat];
670  fdEdxVector = fdEdxTable[jMat];
671  for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++)
672  {
673    if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) break ;   
674  }
675  iPlace = iTkin - 1;
676  if(iPlace < 0) iPlace = 0;
677  dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cut) ) ; 
678
679  if( dEdx < 0.) dEdx = 0.;
680  return dEdx;
681}
682
683/////////////////////////////////////////////////////////////////////////
684
685G4double G4PAIPhotonModel::CrossSectionPerVolume( const G4Material*,
686                                                  const G4ParticleDefinition* p,
687                                                  G4double kineticEnergy,
688                                                  G4double cutEnergy,
689                                                  G4double maxEnergy  ) 
690{
691  G4int iTkin,iPlace;
692  size_t jMat, jMatCC;
693  G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
694  if(cutEnergy >= tmax) return 0.0;
695  G4double particleMass = p->GetPDGMass();
696  G4double scaledTkin   = kineticEnergy*proton_mass_c2/particleMass;
697  G4double charge       = p->GetPDGCharge();
698  G4double charge2      = charge*charge, cross, cross1, cross2;
699  G4double photon1, photon2, plasmon1, plasmon2;
700
701  const G4MaterialCutsCouple* matCC = CurrentCouple();
702
703  const G4ProductionCutsTable* theCoupleTable=
704        G4ProductionCutsTable::GetProductionCutsTable();
705
706  size_t numOfCouples = theCoupleTable->GetTableSize();
707
708  for (jMatCC = 0 ; jMatCC < numOfCouples ; jMatCC++ )
709  {
710    if( matCC == theCoupleTable->GetMaterialCutsCouple(jMatCC) ) break;
711  }
712  if( jMatCC == numOfCouples && jMatCC > 0 ) jMatCC--;
713
714  const vector<G4double>*  photonCutInKineticEnergy = theCoupleTable->
715                                GetEnergyCutsVector(idxG4GammaCut);
716
717  G4double photonCut = (*photonCutInKineticEnergy)[jMatCC] ;
718
719  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
720  {
721    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
722  }
723  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
724
725  fPAItransferTable = fPAIxscBank[jMat];
726  fPAIphotonTable   = fPAIphotonBank[jMat];
727  fPAIplasmonTable  = fPAIplasmonBank[jMat];
728
729  for(iTkin = 0 ; iTkin <= fTotBin ; iTkin++)
730  {
731    if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) break ;   
732  }
733  iPlace = iTkin - 1;
734  if(iPlace < 0) iPlace = 0;
735
736  // G4cout<<"iPlace = "<<iPlace<<"; tmax = "
737  // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl; 
738  photon1 = GetdNdxPhotonCut(iPlace,tmax); 
739  photon2 = GetdNdxPhotonCut(iPlace,photonCut); 
740 
741  plasmon1 = GetdNdxPlasmonCut(iPlace,tmax); 
742  plasmon2 = GetdNdxPlasmonCut(iPlace,cutEnergy); 
743 
744  cross1 = photon1 + plasmon1;   
745  // G4cout<<"cross1 = "<<cross1<<G4endl; 
746  cross2 = photon2 + plasmon2;   
747  // G4cout<<"cross2 = "<<cross2<<G4endl; 
748  cross  = (cross2 - cross1)*charge2;
749  // G4cout<<"cross = "<<cross<<G4endl; 
750
751  if( cross < 0. ) cross = 0.;
752  return cross;
753}
754
755///////////////////////////////////////////////////////////////////////////
756//
757// It is analog of PostStepDoIt in terms of secondary electron or photon to
758// be returned as G4Dynamicparticle*.
759//
760
761void G4PAIPhotonModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
762                                         const G4MaterialCutsCouple* matCC,
763                                         const G4DynamicParticle* dp,
764                                         G4double tmin,
765                                         G4double maxEnergy)
766{
767  size_t jMat;
768  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
769  {
770    if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
771  }
772  if( jMat == fMaterialCutsCoupleVector.size() && jMat > 0 ) jMat--;
773
774  fPAItransferTable = fPAIxscBank[jMat];
775  fPAIphotonTable   = fPAIphotonBank[jMat];
776  fPAIplasmonTable  = fPAIplasmonBank[jMat];
777
778  fdNdxCutVector        = fdNdxCutTable[jMat];
779  fdNdxCutPhotonVector  = fdNdxCutPhotonTable[jMat];
780  fdNdxCutPlasmonVector = fdNdxCutPlasmonTable[jMat];
781
782  G4double tmax = min(MaxSecondaryKinEnergy(dp), maxEnergy);
783  if( tmin >= tmax && fVerbose > 0) 
784  {
785    G4cout<<"G4PAIPhotonModel::SampleSecondary: tmin >= tmax "<<G4endl;
786  }
787
788  G4ThreeVector direction = dp->GetMomentumDirection();
789  G4double particleMass  = dp->GetMass();
790  G4double kineticEnergy = dp->GetKineticEnergy();
791  G4double scaledTkin    = kineticEnergy*fMass/particleMass;
792  G4double totalEnergy   = kineticEnergy + particleMass;
793  G4double pSquare       = kineticEnergy*(totalEnergy+particleMass);
794
795  G4int iTkin;
796  for(iTkin=0;iTkin<=fTotBin;iTkin++)
797  {
798    if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin))  break ;
799  }
800  G4int iPlace = iTkin - 1 ;
801  if(iPlace < 0) iPlace = 0;
802
803  G4double dNdxPhotonCut  = (*fdNdxCutPhotonVector)(iPlace) ; 
804  G4double dNdxPlasmonCut = (*fdNdxCutPlasmonVector)(iPlace) ; 
805  G4double dNdxCut        = dNdxPhotonCut  + dNdxPlasmonCut;
806 
807  G4double ratio;
808  if (dNdxCut > 0.) ratio = dNdxPhotonCut/dNdxCut;
809  else              ratio = 0.;
810
811  if(ratio < G4UniformRand() ) // secondary e-
812  {
813    G4double deltaTkin     = GetPostStepTransfer(fPAIplasmonTable, fdNdxCutPlasmonVector,
814                                                 iPlace, scaledTkin);
815
816//  G4cout<<"PAIPhotonModel PlasmonPostStepTransfer = "<<deltaTkin/keV<<" keV"<<G4endl ;
817 
818    if( deltaTkin <= 0. ) 
819    {
820      G4cout<<"G4PAIPhotonModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl;
821    }
822    if( deltaTkin <= 0.) return;
823
824    G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 ));
825    G4double totalMomentum      = sqrt(pSquare);
826    G4double costheta           = deltaTkin*(totalEnergy + electron_mass_c2)
827                                /(deltaTotalMomentum * totalMomentum);
828
829    if( costheta > 0.99999 ) costheta = 0.99999;
830    G4double sintheta = 0.0;
831    G4double sin2 = 1. - costheta*costheta;
832    if( sin2 > 0.) sintheta = sqrt(sin2);
833
834    //  direction of the delta electron
835 
836    G4double phi = twopi*G4UniformRand(); 
837    G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta;
838
839    G4ThreeVector deltaDirection(dirx,diry,dirz);
840    deltaDirection.rotateUz(direction);
841
842    // primary change
843
844    kineticEnergy -= deltaTkin;
845    G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection;
846    direction = dir.unit();
847    fParticleChange->SetProposedMomentumDirection(direction);
848
849    // create G4DynamicParticle object for e- delta ray
850 
851    G4DynamicParticle* deltaRay = new G4DynamicParticle;
852    deltaRay->SetDefinition(G4Electron::Electron());
853    deltaRay->SetKineticEnergy( deltaTkin );
854    deltaRay->SetMomentumDirection(deltaDirection); 
855    vdp->push_back(deltaRay);
856
857  }
858  else    // secondary 'Cherenkov' photon
859  { 
860    G4double deltaTkin     = GetPostStepTransfer(fPAIphotonTable, fdNdxCutPhotonVector,
861                                                 iPlace,scaledTkin);
862
863    //  G4cout<<"PAIPhotonModel PhotonPostStepTransfer = "<<deltaTkin/keV<<" keV"<<G4endl ;
864
865    if( deltaTkin <= 0. )
866    {
867      G4cout<<"G4PAIPhotonModel::SampleSecondary gamma deltaTkin = "<<deltaTkin<<G4endl;
868    }
869    if( deltaTkin <= 0.) return;
870
871    G4double costheta = 0.; // G4UniformRand(); // VG: ??? for start only
872    G4double sintheta = sqrt((1.+costheta)*(1.-costheta));
873
874    //  direction of the 'Cherenkov' photon 
875    G4double phi = twopi*G4UniformRand(); 
876    G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta;
877
878    G4ThreeVector deltaDirection(dirx,diry,dirz);
879    deltaDirection.rotateUz(direction);
880
881    // primary change
882    kineticEnergy -= deltaTkin;
883
884    // create G4DynamicParticle object for photon ray
885 
886    G4DynamicParticle* photonRay = new G4DynamicParticle;
887    photonRay->SetDefinition( G4Gamma::Gamma() );
888    photonRay->SetKineticEnergy( deltaTkin );
889    photonRay->SetMomentumDirection(deltaDirection); 
890
891    vdp->push_back(photonRay);
892  }
893
894  fParticleChange->SetProposedKineticEnergy(kineticEnergy);
895}
896
897
898///////////////////////////////////////////////////////////////////////
899//
900// Returns post step PAI energy transfer > cut electron/photon energy according to passed
901// scaled kinetic energy of particle
902
903G4double 
904G4PAIPhotonModel::GetPostStepTransfer( G4PhysicsTable* pTable,
905                                       G4PhysicsLogVector* pVector,
906                                       G4int iPlace, G4double scaledTkin )
907{ 
908  // G4cout<<"G4PAIPhotonModel::GetPostStepTransfer"<<G4endl ;
909
910  G4int iTkin = iPlace+1, iTransfer;
911  G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ;
912
913  dNdxCut1 = (*pVector)(iPlace) ; 
914
915  //  G4cout<<"iPlace = "<<iPlace<<endl ;
916
917  if(iTkin == fTotBin) // Fermi plato, try from left
918  {
919      position = dNdxCut1*G4UniformRand() ;
920
921      for( iTransfer = 0;
922 iTransfer < G4int((*pTable)(iPlace)->GetVectorLength()); iTransfer++ )
923      {
924        if(position >= (*(*pTable)(iPlace))(iTransfer)) break ;
925      }
926      transfer = GetEnergyTransfer(pTable,iPlace,position,iTransfer);
927  }
928  else
929  {
930    dNdxCut2 = (*pVector)(iPlace+1) ; 
931    if(iTkin == 0) // Tkin is too small, trying from right only
932    {
933      position = dNdxCut2*G4UniformRand() ;
934
935      for( iTransfer = 0;
936  iTransfer < G4int((*pTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
937      {
938        if(position >= (*(*pTable)(iPlace+1))(iTransfer)) break ;
939      }
940      transfer = GetEnergyTransfer(pTable,iPlace+1,position,iTransfer);
941    } 
942    else // general case: Tkin between two vectors of the material
943    {
944      E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
945      E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin)     ;
946      W  = 1.0/(E2 - E1) ;
947      W1 = (E2 - scaledTkin)*W ;
948      W2 = (scaledTkin - E1)*W ;
949
950      position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ;
951
952        // G4cout<<position<<"\t" ;
953
954      G4int iTrMax1, iTrMax2, iTrMax;
955
956      iTrMax1 = G4int((*pTable)(iPlace)->GetVectorLength());
957      iTrMax2 = G4int((*pTable)(iPlace+1)->GetVectorLength());
958
959      if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2;
960      else                    iTrMax = iTrMax1;
961
962      for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ )
963      {
964          if( position >=
965          ( (*(*pTable)(iPlace))(iTransfer)*W1 +
966            (*(*pTable)(iPlace+1))(iTransfer)*W2) ) break ;
967      }
968      transfer = GetEnergyTransfer(pTable, iPlace, position, iTransfer);
969    }
970  } 
971  //  G4cout<<"PAIPhotonModel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ;
972  if(transfer < 0.0 ) transfer = 0.0 ;
973  return transfer ;
974}
975
976///////////////////////////////////////////////////////////////////////
977//
978// Returns random PAI energy transfer according to passed
979// indexes of particle
980
981G4double
982G4PAIPhotonModel::GetEnergyTransfer( G4PhysicsTable* pTable, G4int iPlace, 
983                                     G4double position, G4int iTransfer )
984{ 
985  G4int iTransferMax;
986  G4double x1, x2, y1, y2, energyTransfer;
987
988  if(iTransfer == 0)
989  {
990    energyTransfer = (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
991  } 
992  else
993  {
994    iTransferMax = G4int((*pTable)(iPlace)->GetVectorLength());
995
996    if ( iTransfer >= iTransferMax)  iTransfer = iTransferMax - 1;
997   
998    y1 = (*(*pTable)(iPlace))(iTransfer-1);
999    y2 = (*(*fPAItransferTable)(iPlace))(iTransfer);
1000
1001    x1 = (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1);
1002    x2 = (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
1003
1004    if ( x1 == x2 )    energyTransfer = x2;
1005    else
1006    {
1007      if ( y1 == y2  ) energyTransfer = x1 + (x2 - x1)*G4UniformRand();
1008      else
1009      {
1010        energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1);
1011      }
1012    }
1013  }
1014  return energyTransfer;
1015}
1016
1017///////////////////////////////////////////////////////////////////////
1018//
1019// Works like AlongStepDoIt method of process family
1020
1021
1022
1023
1024G4double G4PAIPhotonModel::SampleFluctuations( const G4Material* material,
1025                                         const G4DynamicParticle* aParticle,
1026                                               G4double&,
1027                                               G4double& step,
1028                                               G4double&)
1029{
1030  size_t jMat;
1031  for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
1032  {
1033    if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break;
1034  }
1035  if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
1036
1037  fPAItransferTable = fPAIxscBank[jMat];
1038  fPAIphotonTable = fPAIphotonBank[jMat];
1039  fPAIplasmonTable = fPAIplasmonBank[jMat];
1040
1041  fdNdxCutVector   = fdNdxCutTable[jMat];
1042  fdNdxCutPhotonVector   = fdNdxCutPhotonTable[jMat];
1043  fdNdxCutPlasmonVector   = fdNdxCutPlasmonTable[jMat];
1044
1045  G4int iTkin, iPlace  ;
1046
1047  // G4cout<<"G4PAIPhotonModel::SampleFluctuations"<<G4endl ;
1048
1049  G4double loss, photonLoss, plasmonLoss, charge2 ;
1050 
1051
1052  G4double Tkin       = aParticle->GetKineticEnergy() ;
1053  G4double MassRatio  = proton_mass_c2/aParticle->GetDefinition()->GetPDGMass() ;
1054  G4double charge     = aParticle->GetDefinition()->GetPDGCharge() ;
1055  charge2             = charge*charge ;
1056  G4double scaledTkin = Tkin*MassRatio ;
1057  G4double cof        = step*charge2;
1058
1059  for( iTkin = 0; iTkin <= fTotBin; iTkin++)
1060  {
1061    if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin))   break ;
1062  }
1063  iPlace = iTkin - 1 ; 
1064  if( iPlace < 0 ) iPlace = 0;
1065
1066  photonLoss = GetAlongStepTransfer(fPAIphotonTable,fdNdxCutPhotonVector,
1067iPlace,scaledTkin,step,cof);
1068
1069  //  G4cout<<"PAIPhotonModel AlongStepPhotonLoss = "<<photonLoss/keV<<" keV"<<G4endl ;
1070
1071  plasmonLoss = GetAlongStepTransfer(fPAIplasmonTable,fdNdxCutPlasmonVector,
1072iPlace,scaledTkin,step,cof);
1073
1074  //  G4cout<<"PAIPhotonModel AlongStepPlasmonLoss = "<<plasmonLoss/keV<<" keV"<<G4endl ;
1075
1076  loss = photonLoss + plasmonLoss;
1077
1078  //  G4cout<<"PAIPhotonModel AlongStepLoss = "<<loss/keV<<" keV"<<G4endl ;
1079
1080  return loss;
1081}
1082
1083///////////////////////////////////////////////////////////////////////
1084//
1085// Returns along step PAI energy transfer < cut electron/photon energy according to passed
1086// scaled kinetic energy of particle and cof = step*charge*charge
1087
1088G4double 
1089G4PAIPhotonModel::GetAlongStepTransfer( G4PhysicsTable* pTable,
1090                                        G4PhysicsLogVector* pVector,
1091                                        G4int iPlace, G4double scaledTkin,G4double step,
1092                                        G4double cof )
1093{ 
1094  G4int iTkin = iPlace + 1, iTransfer;
1095  G4double loss = 0., position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber;
1096  G4double lambda, stepDelta, stepSum=0. ;
1097  G4long numOfCollisions=0;
1098  G4bool numb = true;
1099
1100  dNdxCut1 = (*pVector)(iPlace) ; 
1101
1102  //  G4cout<<"iPlace = "<<iPlace<<endl ;
1103
1104  if(iTkin == fTotBin) // Fermi plato, try from left
1105  {
1106    meanNumber = ((*(*pTable)(iPlace))(0) - dNdxCut1)*cof;
1107    if(meanNumber < 0.) meanNumber = 0. ;
1108    //  numOfCollisions = RandPoisson::shoot(meanNumber) ;
1109    if( meanNumber > 0.) lambda = step/meanNumber;
1110    else                 lambda = DBL_MAX;
1111    while(numb)
1112    {
1113      stepDelta = CLHEP::RandExponential::shoot(lambda);
1114      stepSum += stepDelta;
1115      if(stepSum >= step) break;
1116      numOfCollisions++;
1117    }   
1118   
1119    //     G4cout<<"numOfCollisions = "<<numOfCollisions<<G4endl ;
1120
1121    while(numOfCollisions)
1122    {
1123      position = dNdxCut1+
1124                 ((*(*pTable)(iPlace))(0) - dNdxCut1)*G4UniformRand() ;
1125
1126      for( iTransfer = 0;
1127   iTransfer < G4int((*pTable)(iPlace)->GetVectorLength()); iTransfer++ )
1128      {
1129        if(position >= (*(*pTable)(iPlace))(iTransfer)) break ;
1130      }
1131      loss += GetEnergyTransfer(pTable,iPlace,position,iTransfer);
1132      numOfCollisions-- ;
1133    }
1134  }
1135  else
1136  {
1137    dNdxCut2 = (*pVector)(iPlace+1) ; 
1138 
1139    if(iTkin == 0) // Tkin is too small, trying from right only
1140    {
1141      meanNumber = ((*(*pTable)(iPlace+1))(0) - dNdxCut2)*cof;
1142      if( meanNumber < 0. ) meanNumber = 0. ;
1143      //  numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
1144      if( meanNumber > 0.) lambda = step/meanNumber;
1145      else                 lambda = DBL_MAX;
1146      while(numb)
1147      {
1148        stepDelta = CLHEP::RandExponential::shoot(lambda);
1149        stepSum += stepDelta;
1150        if(stepSum >= step) break;
1151        numOfCollisions++;
1152      }   
1153
1154      //  G4cout<<"numOfCollisions = "<<numOfCollisions<<G4endl ;
1155
1156      while(numOfCollisions)
1157      {
1158        position = dNdxCut2+
1159                   ((*(*pTable)(iPlace+1))(0) - dNdxCut2)*G4UniformRand();
1160   
1161        for( iTransfer = 0;
1162   iTransfer < G4int((*pTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
1163        {
1164          if(position >= (*(*pTable)(iPlace+1))(iTransfer)) break ;
1165        }
1166        loss += GetEnergyTransfer(pTable,iPlace+1,position,iTransfer);
1167        numOfCollisions-- ;
1168      }
1169    } 
1170    else // general case: Tkin between two vectors of the material
1171    {
1172      E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
1173      E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin)     ;
1174       W = 1.0/(E2 - E1) ;
1175      W1 = (E2 - scaledTkin)*W ;
1176      W2 = (scaledTkin - E1)*W ;
1177
1178      // G4cout<<"(*(*pTable)(iPlace))(0) = "<<
1179      //   (*(*pTable)(iPlace))(0)<<G4endl ;
1180      // G4cout<<"(*(*pTable)(iPlace+1))(0) = "<<
1181      //     (*(*pTable)(iPlace+1))(0)<<G4endl ;
1182
1183      meanNumber=( ((*(*pTable)(iPlace))(0)-dNdxCut1)*W1 + 
1184                   ((*(*pTable)(iPlace+1))(0)-dNdxCut2)*W2 )*cof;
1185      if(meanNumber<0.0) meanNumber = 0.0;
1186      //  numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
1187      if( meanNumber > 0.) lambda = step/meanNumber;
1188      else                 lambda = DBL_MAX;
1189      while(numb)
1190      {
1191        stepDelta = CLHEP::RandExponential::shoot(lambda);
1192        stepSum += stepDelta;
1193        if(stepSum >= step) break;
1194        numOfCollisions++;
1195      }   
1196
1197      //  G4cout<<"numOfCollisions = "<<numOfCollisions<<endl ;
1198
1199      while(numOfCollisions)
1200      {
1201        position = dNdxCut1*W1 + dNdxCut2*W2 +
1202                   ( ( (*(*pTable)(iPlace  ))(0) - dNdxCut1)*W1 + 
1203                   
1204                     ( (*(*pTable)(iPlace+1))(0) - dNdxCut2)*W2 )*G4UniformRand();
1205
1206        // G4cout<<position<<"\t" ;
1207
1208        for( iTransfer = 0;
1209    iTransfer < G4int((*pTable)(iPlace)->GetVectorLength()); iTransfer++ )
1210        {
1211          if( position >=
1212          ( (*(*pTable)(iPlace))(iTransfer)*W1 + 
1213            (*(*pTable)(iPlace+1))(iTransfer)*W2) )
1214          {
1215              break ;
1216          }
1217        }
1218        // loss += (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
1219        loss += GetEnergyTransfer(pTable,iPlace,position,iTransfer);
1220        numOfCollisions-- ;   
1221      }
1222    }
1223  } 
1224
1225  return loss ;
1226
1227}
1228
1229//////////////////////////////////////////////////////////////////////
1230//
1231// Returns the statistical estimation of the energy loss distribution variance
1232//
1233
1234
1235G4double G4PAIPhotonModel::Dispersion( const G4Material* material, 
1236                                 const G4DynamicParticle* aParticle,
1237                                       G4double& tmax, 
1238                                       G4double& step       )
1239{
1240  G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.;
1241  for(G4int i = 0 ; i < fMeanNumber; i++)
1242  {
1243    loss      = SampleFluctuations(material,aParticle,tmax,step,meanLoss);
1244    sumLoss  += loss;
1245    sumLoss2 += loss*loss;
1246  }
1247  meanLoss = sumLoss/fMeanNumber;
1248  sigma2   = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber;
1249  return sigma2;
1250}
1251
1252/////////////////////////////////////////////////////////////////////
1253
1254G4double G4PAIPhotonModel::MaxSecondaryEnergy( const G4ParticleDefinition* p,
1255                                                      G4double kinEnergy) 
1256{
1257  G4double tmax = kinEnergy;
1258  if(p == fElectron) tmax *= 0.5;
1259  else if(p != fPositron) { 
1260    G4double mass = p->GetPDGMass();
1261    G4double ratio= electron_mass_c2/mass;
1262    G4double gamma= kinEnergy/mass + 1.0;
1263    tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
1264                  (1. + 2.0*gamma*ratio + ratio*ratio);
1265  }
1266  return tmax;
1267}
1268
1269///////////////////////////////////////////////////////////////
1270
1271void G4PAIPhotonModel::DefineForRegion(const G4Region* r) 
1272{
1273  fPAIRegionVector.push_back(r);
1274}
1275
1276
1277//
1278//
1279/////////////////////////////////////////////////
1280
1281
1282
1283
1284
1285
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