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source: trunk/source/processes/electromagnetic/standard/src/G4PAIPhotonModel.cc@ 1036

Last change on this file since 1036 was 1007, checked in by garnier, 17 years ago
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25	//
26	// File name: G4PAIPhotonModel.cc
27	//
28	// Author: Vladimir.Grichine@cern.ch based on G4PAIModel class
29	//
30	// Creation date: 20.05.2004
31	//
32	// Modifications:
33	//
34	// 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary
35	// 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection, SampleSecondary
36	// 11.04.05 Major optimisation of internal interfaces (V.Ivantchenko)
37	//
38
39	#include "G4Region.hh"
40	#include "G4PhysicsLogVector.hh"
41	#include "G4PhysicsFreeVector.hh"
42	#include "G4PhysicsTable.hh"
43	#include "G4ProductionCutsTable.hh"
44	#include "G4MaterialCutsCouple.hh"
45	#include "G4MaterialTable.hh"
46	#include "G4SandiaTable.hh"
47	#include "G4PAIxSection.hh"
48
49	#include "G4PAIPhotonModel.hh"
50	#include "Randomize.hh"
51	#include "G4Electron.hh"
52	#include "G4Positron.hh"
53	#include "G4Gamma.hh"
54	#include "G4Poisson.hh"
55	#include "G4Step.hh"
56	#include "G4Material.hh"
57	#include "G4DynamicParticle.hh"
58	#include "G4ParticleDefinition.hh"
59	#include "G4ParticleChangeForLoss.hh"
60	#include "G4GeometryTolerance.hh"
61
62	////////////////////////////////////////////////////////////////////////
63
64	using namespace std;
65
66	G4PAIPhotonModel::G4PAIPhotonModel(const G4ParticleDefinition* p, const G4String& nam)
67	: G4VEmModel(nam),G4VEmFluctuationModel(nam),
68	fLowestKineticEnergy(10.0*keV),
69	fHighestKineticEnergy(100.*TeV),
70	fTotBin(200),
71	fMeanNumber(20),
72	fParticle(0),
73	fHighKinEnergy(100.*TeV),
74	fLowKinEnergy(2.0*MeV),
75	fTwoln10(2.0*log(10.0)),
76	fBg2lim(0.0169),
77	fTaulim(8.4146e-3)
78	{
79	if(p) SetParticle(p);
80
81	fVerbose = 0;
82	fElectron = G4Electron::Electron();
83	fPositron = G4Positron::Positron();
84
85	fProtonEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
86	fHighestKineticEnergy,
87	fTotBin);
88	fPAItransferTable = 0;
89	fPAIphotonTable = 0;
90	fPAIplasmonTable = 0;
91
92	fPAIdEdxTable = 0;
93	fSandiaPhotoAbsCof = 0;
94	fdEdxVector = 0;
95
96	fLambdaVector = 0;
97	fdNdxCutVector = 0;
98	fdNdxCutPhotonVector = 0;
99	fdNdxCutPlasmonVector = 0;
100
101	isInitialised = false;
102	}
103
104	////////////////////////////////////////////////////////////////////////////
105
106	G4PAIPhotonModel::~G4PAIPhotonModel()
107	{
108	if(fProtonEnergyVector) delete fProtonEnergyVector;
109	if(fdEdxVector) delete fdEdxVector ;
110	if ( fLambdaVector) delete fLambdaVector;
111	if ( fdNdxCutVector) delete fdNdxCutVector;
112
113	if( fPAItransferTable )
114	{
115	fPAItransferTable->clearAndDestroy();
116	delete fPAItransferTable ;
117	}
118	if( fPAIphotonTable )
119	{
120	fPAIphotonTable->clearAndDestroy();
121	delete fPAIphotonTable ;
122	}
123	if( fPAIplasmonTable )
124	{
125	fPAIplasmonTable->clearAndDestroy();
126	delete fPAIplasmonTable ;
127	}
128	if(fSandiaPhotoAbsCof)
129	{
130	for(G4int i=0;i<fSandiaIntervalNumber;i++)
131	{
132	delete[] fSandiaPhotoAbsCof[i];
133	}
134	delete[] fSandiaPhotoAbsCof;
135	}
136	}
137
138	///////////////////////////////////////////////////////////////////////////////
139
140	void G4PAIPhotonModel::SetParticle(const G4ParticleDefinition* p)
141	{
142	fParticle = p;
143	fMass = fParticle->GetPDGMass();
144	fSpin = fParticle->GetPDGSpin();
145	G4double q = fParticle->GetPDGCharge()/eplus;
146	fChargeSquare = q*q;
147	fLowKinEnergy *= fMass/proton_mass_c2;
148	fRatio = electron_mass_c2/fMass;
149	fQc = fMass/fRatio;
150	}
151
152	////////////////////////////////////////////////////////////////////////////
153
154	void G4PAIPhotonModel::Initialise(const G4ParticleDefinition* p,
155	const G4DataVector&)
156	{
157	if(isInitialised) return;
158	isInitialised = true;
159
160	if(!fParticle) SetParticle(p);
161
162	if(pParticleChange)
163	fParticleChange = reinterpret_cast<G4ParticleChangeForLoss*>(pParticleChange);
164	else
165	fParticleChange = new G4ParticleChangeForLoss();
166
167	const G4ProductionCutsTable* theCoupleTable =
168	G4ProductionCutsTable::GetProductionCutsTable();
169
170	for(size_t iReg = 0; iReg < fPAIRegionVector.size();++iReg) // region loop
171	{
172	const G4Region* curReg = fPAIRegionVector[iReg];
173
174	vector<G4Material*>::const_iterator matIter = curReg->GetMaterialIterator();
175	size_t jMat;
176	size_t numOfMat = curReg->GetNumberOfMaterials();
177
178	// for(size_t jMat = 0; jMat < curReg->GetNumberOfMaterials();++jMat){}
179	const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
180	size_t numberOfMat = G4Material::GetNumberOfMaterials();
181
182	for(jMat = 0 ; jMat < numOfMat; ++jMat) // region material loop
183	{
184	const G4MaterialCutsCouple* matCouple = theCoupleTable->
185	GetMaterialCutsCouple( *matIter, curReg->GetProductionCuts() );
186	fMaterialCutsCoupleVector.push_back(matCouple);
187
188	size_t iMatGlob;
189	for(iMatGlob = 0 ; iMatGlob < numberOfMat ; iMatGlob++ )
190	{
191	if( matIter == (theMaterialTable)[iMatGlob]) break ;
192	}
193	fMatIndex = iMatGlob;
194
195	ComputeSandiaPhotoAbsCof();
196	BuildPAIonisationTable();
197
198	fPAIxscBank.push_back(fPAItransferTable);
199	fPAIphotonBank.push_back(fPAIphotonTable);
200	fPAIplasmonBank.push_back(fPAIplasmonTable);
201	fPAIdEdxBank.push_back(fPAIdEdxTable);
202	fdEdxTable.push_back(fdEdxVector);
203
204	BuildLambdaVector(matCouple);
205
206	fdNdxCutTable.push_back(fdNdxCutVector);
207	fdNdxCutPhotonTable.push_back(fdNdxCutPhotonVector);
208	fdNdxCutPlasmonTable.push_back(fdNdxCutPlasmonVector);
209	fLambdaTable.push_back(fLambdaVector);
210
211
212	matIter++;
213	}
214	}
215	}
216
217	//////////////////////////////////////////////////////////////////
218
219	void G4PAIPhotonModel::ComputeSandiaPhotoAbsCof()
220	{
221	G4int i, j, numberOfElements ;
222	static const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
223
224	G4SandiaTable thisMaterialSandiaTable(fMatIndex) ;
225	numberOfElements = (*theMaterialTable)[fMatIndex]->
226	GetNumberOfElements();
227	G4int* thisMaterialZ = new G4int[numberOfElements] ;
228
229	for(i=0;i<numberOfElements;i++)
230	{
231	thisMaterialZ[i] =
232	(G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ;
233	}
234	fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals
235	(thisMaterialZ,numberOfElements) ;
236
237	fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing
238	( thisMaterialZ ,
239	(*theMaterialTable)[fMatIndex]->GetFractionVector() ,
240	numberOfElements,fSandiaIntervalNumber) ;
241
242	fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ;
243
244	for(i=0;i<fSandiaIntervalNumber;i++) fSandiaPhotoAbsCof[i] = new G4double[5] ;
245
246	for( i = 0 ; i < fSandiaIntervalNumber ; i++ )
247	{
248	fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0) ;
249
250	for( j = 1; j < 5 ; j++ )
251	{
252	fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable.
253	GetPhotoAbsorpCof(i+1,j)*
254	(*theMaterialTable)[fMatIndex]->GetDensity() ;
255	}
256	}
257	// delete[] thisMaterialZ ;
258	}
259
260	////////////////////////////////////////////////////////////////////////////
261	//
262	// Build tables for the ionization energy loss
263	// the tables are built for MATERIALS
264	// *********
265
266	void
267	G4PAIPhotonModel::BuildPAIonisationTable()
268	{
269	G4double LowEdgeEnergy , ionloss ;
270	G4double massRatio, tau, Tmax, Tmin, Tkin, deltaLow, gamma, bg2 ;
271	/*
272	if( fPAItransferTable )
273	{
274	fPAItransferTable->clearAndDestroy() ;
275	delete fPAItransferTable ;
276	}
277	*/
278	fPAItransferTable = new G4PhysicsTable(fTotBin);
279	/*
280	if( fPAIratioTable )
281	{
282	fPAIratioTable->clearAndDestroy() ;
283	delete fPAIratioTable ;
284	}
285	*/
286	fPAIphotonTable = new G4PhysicsTable(fTotBin);
287	fPAIplasmonTable = new G4PhysicsTable(fTotBin);
288	/*
289	if( fPAIdEdxTable )
290	{
291	fPAIdEdxTable->clearAndDestroy() ;
292	delete fPAIdEdxTable ;
293	}
294	*/
295	fPAIdEdxTable = new G4PhysicsTable(fTotBin);
296
297	// if(fdEdxVector) delete fdEdxVector ;
298	fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy,
299	fHighestKineticEnergy,
300	fTotBin ) ;
301	Tmin = fSandiaPhotoAbsCof[0][0] ; // low energy Sandia interval
302	deltaLow = 100.eV; // 0.5eV ;
303
304	for (G4int i = 0 ; i < fTotBin ; i++) //The loop for the kinetic energy
305	{
306	LowEdgeEnergy = fProtonEnergyVector->GetLowEdgeEnergy(i) ;
307	tau = LowEdgeEnergy/proton_mass_c2 ;
308	// if(tau < 0.01) tau = 0.01 ;
309	gamma = tau +1. ;
310	// G4cout<<"gamma = "<<gamma<<endl ;
311	bg2 = tau*(tau + 2. ) ;
312	massRatio = electron_mass_c2/proton_mass_c2 ;
313	Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy);
314	// G4cout<<"proton Tkin = "<<LowEdgeEnergy/MeV<<" MeV"
315	// <<" Tmax = "<<Tmax/MeV<<" MeV"<<G4endl;
316	// Tkin = DeltaCutInKineticEnergyNow ;
317
318	// if ( DeltaCutInKineticEnergyNow > Tmax) // was <
319	Tkin = Tmax ;
320	if ( Tkin < Tmin + deltaLow ) // low energy safety
321	{
322	Tkin = Tmin + deltaLow ;
323	}
324	G4PAIxSection protonPAI( fMatIndex,
325	Tkin,
326	bg2,
327	fSandiaPhotoAbsCof,
328	fSandiaIntervalNumber ) ;
329
330
331	// G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ;
332	// G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ;
333	// G4cout<<"protonPAI.GetSplineSize() = "<<
334	// protonPAI.GetSplineSize()<<G4endl<<G4endl ;
335
336	G4PhysicsFreeVector* transferVector = new
337	G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
338	G4PhysicsFreeVector* photonVector = new
339	G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
340	G4PhysicsFreeVector* plasmonVector = new
341	G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
342	G4PhysicsFreeVector* dEdxVector = new
343	G4PhysicsFreeVector(protonPAI.GetSplineSize()) ;
344
345	for( G4int k = 0 ; k < protonPAI.GetSplineSize() ; k++ )
346	{
347	transferVector->PutValue( k ,
348	protonPAI.GetSplineEnergy(k+1),
349	protonPAI.GetIntegralPAIxSection(k+1) ) ;
350	photonVector->PutValue( k ,
351	protonPAI.GetSplineEnergy(k+1),
352	protonPAI.GetIntegralCerenkov(k+1) ) ;
353	plasmonVector->PutValue( k ,
354	protonPAI.GetSplineEnergy(k+1),
355	protonPAI.GetIntegralPlasmon(k+1) ) ;
356	dEdxVector->PutValue( k ,
357	protonPAI.GetSplineEnergy(k+1),
358	protonPAI.GetIntegralPAIdEdx(k+1) ) ;
359	}
360	ionloss = protonPAI.GetMeanEnergyLoss() ; // total <dE/dx>
361	if ( ionloss <= 0.) ionloss = DBL_MIN ;
362	fdEdxVector->PutValue(i,ionloss) ;
363
364	fPAItransferTable->insertAt(i,transferVector) ;
365	fPAIphotonTable->insertAt(i,photonVector) ;
366	fPAIplasmonTable->insertAt(i,plasmonVector) ;
367	fPAIdEdxTable->insertAt(i,dEdxVector) ;
368
369	} // end of Tkin loop
370	// theLossTable->insert(fdEdxVector);
371	// end of material loop
372	// G4cout<<"G4PAIonisation::BuildPAIonisationTable() have been called"<<G4endl ;
373	// G4cout<<"G4PAIonisation::BuildLossTable() have been called"<<G4endl ;
374	}
375
376	///////////////////////////////////////////////////////////////////////
377	//
378	// Build mean free path tables for the delta ray production process
379	// tables are built for MATERIALS
380	//
381
382	void
383	G4PAIPhotonModel::BuildLambdaVector(const G4MaterialCutsCouple* matCutsCouple)
384	{
385	G4int i ;
386	G4double dNdxCut,dNdxPhotonCut,dNdxPlasmonCut, lambda;
387	G4double kCarTolerance = G4GeometryTolerance::GetInstance()
388	->GetSurfaceTolerance();
389
390	const G4ProductionCutsTable* theCoupleTable=
391	G4ProductionCutsTable::GetProductionCutsTable();
392
393	size_t numOfCouples = theCoupleTable->GetTableSize();
394	size_t jMatCC;
395
396	for (jMatCC = 0 ; jMatCC < numOfCouples ; jMatCC++ )
397	{
398	if( matCutsCouple == theCoupleTable->GetMaterialCutsCouple(jMatCC) ) break;
399	}
400	if( jMatCC == numOfCouples && jMatCC > 0 ) jMatCC--;
401
402	const vector<G4double>* deltaCutInKineticEnergy = theCoupleTable->
403	GetEnergyCutsVector(idxG4ElectronCut);
404	const vector<G4double>* photonCutInKineticEnergy = theCoupleTable->
405	GetEnergyCutsVector(idxG4GammaCut);
406
407	if (fLambdaVector) delete fLambdaVector;
408	if (fdNdxCutVector) delete fdNdxCutVector;
409	if (fdNdxCutPhotonVector) delete fdNdxCutPhotonVector;
410	if (fdNdxCutPlasmonVector) delete fdNdxCutPlasmonVector;
411
412	fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy,
413	fHighestKineticEnergy,
414	fTotBin );
415	fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy,
416	fHighestKineticEnergy,
417	fTotBin );
418	fdNdxCutPhotonVector = new G4PhysicsLogVector( fLowestKineticEnergy,
419	fHighestKineticEnergy,
420	fTotBin );
421	fdNdxCutPlasmonVector = new G4PhysicsLogVector( fLowestKineticEnergy,
422	fHighestKineticEnergy,
423	fTotBin );
424
425	G4double deltaCutInKineticEnergyNow = (*deltaCutInKineticEnergy)[jMatCC];
426	G4double photonCutInKineticEnergyNow = (*photonCutInKineticEnergy)[jMatCC];
427
428	if(fVerbose > 0)
429	{
430	G4cout<<"PAIPhotonModel deltaCutInKineticEnergyNow = "
431	<<deltaCutInKineticEnergyNow/keV<<" keV"<<G4endl;
432	G4cout<<"PAIPhotonModel photonCutInKineticEnergyNow = "
433	<<photonCutInKineticEnergyNow/keV<<" keV"<<G4endl;
434	}
435	for ( i = 0 ; i < fTotBin ; i++ )
436	{
437	dNdxPhotonCut = GetdNdxPhotonCut(i,photonCutInKineticEnergyNow);
438	dNdxPlasmonCut = GetdNdxPlasmonCut(i,deltaCutInKineticEnergyNow);
439
440	dNdxCut = dNdxPhotonCut + dNdxPlasmonCut;
441	lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut;
442
443	if (lambda <= 1000kCarTolerance) lambda = 1000kCarTolerance; // Mmm ???
444
445	fLambdaVector->PutValue(i, lambda);
446
447	fdNdxCutVector->PutValue(i, dNdxCut);
448	fdNdxCutPhotonVector->PutValue(i, dNdxPhotonCut);
449	fdNdxCutPlasmonVector->PutValue(i, dNdxPlasmonCut);
450	}
451	}
452
453	///////////////////////////////////////////////////////////////////////
454	//
455	// Returns integral PAI cross section for energy transfers >= transferCut
456
457	G4double
458	G4PAIPhotonModel::GetdNdxCut( G4int iPlace, G4double transferCut)
459	{
460	G4int iTransfer;
461	G4double x1, x2, y1, y2, dNdxCut;
462	// G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
463	// G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength())
464	// <<G4endl;
465	for( iTransfer = 0 ;
466	iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ;
467	iTransfer++)
468	{
469	if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
470	{
471	break ;
472	}
473	}
474	if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) )
475	{
476	iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ;
477	}
478	y1 = ((fPAItransferTable)(iPlace))(iTransfer-1) ;
479	y2 = ((fPAItransferTable)(iPlace))(iTransfer) ;
480	// G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
481	x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
482	x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
483	// G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
484
485	if ( y1 == y2 ) dNdxCut = y2 ;
486	else
487	{
488	// if ( x1 == x2 ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
489	if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
490	else dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;
491	}
492	// G4cout<<""<<dNdxCut<<G4endl;
493	return dNdxCut ;
494	}
495
496	///////////////////////////////////////////////////////////////////////
497	//
498	// Returns integral PAI cherenkovcross section for energy transfers >= transferCut
499
500	G4double
501	G4PAIPhotonModel::GetdNdxPhotonCut( G4int iPlace, G4double transferCut)
502	{
503	G4int iTransfer;
504	G4double x1, x2, y1, y2, dNdxCut;
505	// G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
506	// G4cout<<"size = "<<G4int((*fPAIphotonTable)(iPlace)->GetVectorLength())
507	// <<G4endl;
508	for( iTransfer = 0 ;
509	iTransfer < G4int((*fPAIphotonTable)(iPlace)->GetVectorLength()) ;
510	iTransfer++)
511	{
512	if(transferCut <= (*fPAIphotonTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
513	{
514	break ;
515	}
516	}
517	if ( iTransfer >= G4int((*fPAIphotonTable)(iPlace)->GetVectorLength()) )
518	{
519	iTransfer = (*fPAIphotonTable)(iPlace)->GetVectorLength() - 1 ;
520	}
521	y1 = ((fPAIphotonTable)(iPlace))(iTransfer-1) ;
522	y2 = ((fPAIphotonTable)(iPlace))(iTransfer) ;
523	// G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
524	x1 = (*fPAIphotonTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
525	x2 = (*fPAIphotonTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
526	// G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
527
528	if ( y1 == y2 ) dNdxCut = y2 ;
529	else
530	{
531	// if ( x1 == x2 ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
532	if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
533	else dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;
534	}
535	// G4cout<<""<<dNdxPhotonCut<<G4endl;
536	return dNdxCut ;
537	}
538
539	///////////////////////////////////////////////////////////////////////
540	//
541	// Returns integral PAI cross section for energy transfers >= transferCut
542
543	G4double
544	G4PAIPhotonModel::GetdNdxPlasmonCut( G4int iPlace, G4double transferCut)
545	{
546	G4int iTransfer;
547	G4double x1, x2, y1, y2, dNdxCut;
548
549	// G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
550	// G4cout<<"size = "<<G4int((*fPAIPlasmonTable)(iPlace)->GetVectorLength())
551	// <<G4endl;
552	for( iTransfer = 0 ;
553	iTransfer < G4int((*fPAIplasmonTable)(iPlace)->GetVectorLength()) ;
554	iTransfer++)
555	{
556	if(transferCut <= (*fPAIplasmonTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
557	{
558	break ;
559	}
560	}
561	if ( iTransfer >= G4int((*fPAIplasmonTable)(iPlace)->GetVectorLength()) )
562	{
563	iTransfer = (*fPAIplasmonTable)(iPlace)->GetVectorLength() - 1 ;
564	}
565	y1 = ((fPAIplasmonTable)(iPlace))(iTransfer-1) ;
566	y2 = ((fPAIplasmonTable)(iPlace))(iTransfer) ;
567	// G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
568	x1 = (*fPAIplasmonTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
569	x2 = (*fPAIplasmonTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
570	// G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
571
572	if ( y1 == y2 ) dNdxCut = y2 ;
573	else
574	{
575	// if ( x1 == x2 ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
576	if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ;
577	else dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;
578	}
579	// G4cout<<""<<dNdxPlasmonCut<<G4endl;
580	return dNdxCut ;
581	}
582
583	///////////////////////////////////////////////////////////////////////
584	//
585	// Returns integral dEdx for energy transfers >= transferCut
586
587	G4double
588	G4PAIPhotonModel::GetdEdxCut( G4int iPlace, G4double transferCut)
589	{
590	G4int iTransfer;
591	G4double x1, x2, y1, y2, dEdxCut;
592	// G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl;
593	// G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength())
594	// <<G4endl;
595	for( iTransfer = 0 ;
596	iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ;
597	iTransfer++)
598	{
599	if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer))
600	{
601	break ;
602	}
603	}
604	if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) )
605	{
606	iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ;
607	}
608	y1 = ((fPAIdEdxTable)(iPlace))(iTransfer-1) ;
609	y2 = ((fPAIdEdxTable)(iPlace))(iTransfer) ;
610	// G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl;
611	x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ;
612	x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
613	// G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl;
614
615	if ( y1 == y2 ) dEdxCut = y2 ;
616	else
617	{
618	// if ( x1 == x2 ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
619	if ( std::abs(x1-x2) <= eV ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ;
620	else dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ;
621	}
622	// G4cout<<""<<dEdxCut<<G4endl;
623	return dEdxCut ;
624	}
625
626	//////////////////////////////////////////////////////////////////////////////
627
628	G4double G4PAIPhotonModel::ComputeDEDX(const G4MaterialCutsCouple* matCC,
629	const G4ParticleDefinition* p,
630	G4double kineticEnergy,
631	G4double cutEnergy)
632	{
633	G4int iTkin,iPlace;
634	size_t jMat;
635	G4double particleMass = p->GetPDGMass();
636	G4double scaledTkin = kineticEnergy*proton_mass_c2/particleMass;
637	G4double charge = p->GetPDGCharge()/eplus;
638	G4double charge2 = charge*charge;
639	G4double dEdx = 0.;
640
641	for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
642	{
643	if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
644	}
645	if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
646
647	fPAIdEdxTable = fPAIdEdxBank[jMat];
648	fdEdxVector = fdEdxTable[jMat];
649	for(iTkin = 0 ; iTkin < fTotBin ; iTkin++)
650	{
651	if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) break ;
652	}
653	iPlace = iTkin - 1;
654	if(iPlace < 0) iPlace = 0;
655	dEdx = charge2( (fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cutEnergy) ) ;
656
657	if( dEdx < 0.) dEdx = 0.;
658	return dEdx;
659	}
660
661	/////////////////////////////////////////////////////////////////////////
662
663	G4double G4PAIPhotonModel::CrossSection( const G4MaterialCutsCouple* matCC,
664	const G4ParticleDefinition* p,
665	G4double kineticEnergy,
666	G4double cutEnergy,
667	G4double maxEnergy )
668	{
669	G4int iTkin,iPlace;
670	size_t jMat, jMatCC;
671	G4double tmax = min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
672	G4double particleMass = p->GetPDGMass();
673	G4double scaledTkin = kineticEnergy*proton_mass_c2/particleMass;
674	G4double charge = p->GetPDGCharge();
675	G4double charge2 = charge*charge, cross, cross1, cross2;
676	G4double photon1, photon2, plasmon1, plasmon2;
677
678	const G4ProductionCutsTable* theCoupleTable=
679	G4ProductionCutsTable::GetProductionCutsTable();
680
681	size_t numOfCouples = theCoupleTable->GetTableSize();
682
683	for (jMatCC = 0 ; jMatCC < numOfCouples ; jMatCC++ )
684	{
685	if( matCC == theCoupleTable->GetMaterialCutsCouple(jMatCC) ) break;
686	}
687	if( jMatCC == numOfCouples && jMatCC > 0 ) jMatCC--;
688
689	const vector<G4double>* photonCutInKineticEnergy = theCoupleTable->
690	GetEnergyCutsVector(idxG4GammaCut);
691
692	G4double photonCut = (*photonCutInKineticEnergy)[jMatCC] ;
693
694	for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
695	{
696	if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
697	}
698	if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
699
700	fPAItransferTable = fPAIxscBank[jMat];
701	fPAIphotonTable = fPAIphotonBank[jMat];
702	fPAIplasmonTable = fPAIplasmonBank[jMat];
703
704	for(iTkin = 0 ; iTkin < fTotBin ; iTkin++)
705	{
706	if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) break ;
707	}
708	iPlace = iTkin - 1;
709	if(iPlace < 0) iPlace = 0;
710
711	// G4cout<<"iPlace = "<<iPlace<<"; tmax = "
712	// <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl;
713	photon1 = GetdNdxPhotonCut(iPlace,tmax);
714	photon2 = GetdNdxPhotonCut(iPlace,photonCut);
715
716	plasmon1 = GetdNdxPlasmonCut(iPlace,tmax);
717	plasmon2 = GetdNdxPlasmonCut(iPlace,cutEnergy);
718
719	cross1 = photon1 + plasmon1;
720	// G4cout<<"cross1 = "<<cross1<<G4endl;
721	cross2 = photon2 + plasmon2;
722	// G4cout<<"cross2 = "<<cross2<<G4endl;
723	cross = (cross2 - cross1)*charge2;
724	// G4cout<<"cross = "<<cross<<G4endl;
725
726	if( cross < 0. ) cross = 0.;
727	return cross;
728	}
729
730	///////////////////////////////////////////////////////////////////////////
731	//
732	// It is analog of PostStepDoIt in terms of secondary electron or photon to
733	// be returned as G4Dynamicparticle*.
734	//
735
736	void G4PAIPhotonModel::SampleSecondaries(std::vector<G4DynamicParticle> vdp,
737	const G4MaterialCutsCouple* matCC,
738	const G4DynamicParticle* dp,
739	G4double tmin,
740	G4double maxEnergy)
741	{
742	size_t jMat;
743	for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
744	{
745	if( matCC == fMaterialCutsCoupleVector[jMat] ) break;
746	}
747	if( jMat == fMaterialCutsCoupleVector.size() && jMat > 0 ) jMat--;
748
749	fPAItransferTable = fPAIxscBank[jMat];
750	fPAIphotonTable = fPAIphotonBank[jMat];
751	fPAIplasmonTable = fPAIplasmonBank[jMat];
752
753	fdNdxCutVector = fdNdxCutTable[jMat];
754	fdNdxCutPhotonVector = fdNdxCutPhotonTable[jMat];
755	fdNdxCutPlasmonVector = fdNdxCutPlasmonTable[jMat];
756
757	G4double tmax = min(MaxSecondaryKinEnergy(dp), maxEnergy);
758	if( tmin >= tmax && fVerbose > 0)
759	{
760	G4cout<<"G4PAIPhotonModel::SampleSecondary: tmin >= tmax "<<G4endl;
761	}
762
763	G4ThreeVector direction = dp->GetMomentumDirection();
764	G4double particleMass = dp->GetMass();
765	G4double kineticEnergy = dp->GetKineticEnergy();
766	G4double scaledTkin = kineticEnergy*fMass/particleMass;
767	G4double totalEnergy = kineticEnergy + particleMass;
768	G4double pSquare = kineticEnergy*(totalEnergy+particleMass);
769
770	G4int iTkin;
771	for(iTkin=0;iTkin<fTotBin;iTkin++)
772	{
773	if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) break ;
774	}
775	G4int iPlace = iTkin - 1 ;
776	if(iPlace < 0) iPlace = 0;
777
778	G4double dNdxPhotonCut = (*fdNdxCutPhotonVector)(iPlace) ;
779	G4double dNdxPlasmonCut = (*fdNdxCutPlasmonVector)(iPlace) ;
780	G4double dNdxCut = dNdxPhotonCut + dNdxPlasmonCut;
781
782	G4double ratio;
783	if (dNdxCut > 0.) ratio = dNdxPhotonCut/dNdxCut;
784	else ratio = 0.;
785
786	if(ratio < G4UniformRand() ) // secondary e-
787	{
788	G4double deltaTkin = GetPostStepTransfer(fPAIplasmonTable, fdNdxCutPlasmonVector,
789	iPlace, scaledTkin);
790
791	// G4cout<<"PAIPhotonModel PlasmonPostStepTransfer = "<<deltaTkin/keV<<" keV"<<G4endl ;
792
793	if( deltaTkin <= 0. )
794	{
795	G4cout<<"G4PAIPhotonModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl;
796	}
797	if( deltaTkin <= 0.) return;
798
799	G4double deltaTotalMomentum = sqrt(deltaTkin(deltaTkin + 2. electron_mass_c2 ));
800	G4double totalMomentum = sqrt(pSquare);
801	G4double costheta = deltaTkin*(totalEnergy + electron_mass_c2)
802	/(deltaTotalMomentum * totalMomentum);
803
804	if( costheta > 0.99999 ) costheta = 0.99999;
805	G4double sintheta = 0.0;
806	G4double sin2 = 1. - costheta*costheta;
807	if( sin2 > 0.) sintheta = sqrt(sin2);
808
809	// direction of the delta electron
810
811	G4double phi = twopi*G4UniformRand();
812	G4double dirx = sinthetacos(phi), diry = sinthetasin(phi), dirz = costheta;
813
814	G4ThreeVector deltaDirection(dirx,diry,dirz);
815	deltaDirection.rotateUz(direction);
816
817	// primary change
818
819	kineticEnergy -= deltaTkin;
820	G4ThreeVector dir = totalMomentumdirection - deltaTotalMomentumdeltaDirection;
821	direction = dir.unit();
822	fParticleChange->SetProposedMomentumDirection(direction);
823
824	// create G4DynamicParticle object for e- delta ray
825
826	G4DynamicParticle* deltaRay = new G4DynamicParticle;
827	deltaRay->SetDefinition(G4Electron::Electron());
828	deltaRay->SetKineticEnergy( deltaTkin );
829	deltaRay->SetMomentumDirection(deltaDirection);
830	vdp->push_back(deltaRay);
831
832	}
833	else // secondary 'Cherenkov' photon
834	{
835	G4double deltaTkin = GetPostStepTransfer(fPAIphotonTable, fdNdxCutPhotonVector,
836	iPlace,scaledTkin);
837
838	// G4cout<<"PAIPhotonModel PhotonPostStepTransfer = "<<deltaTkin/keV<<" keV"<<G4endl ;
839
840	if( deltaTkin <= 0. )
841	{
842	G4cout<<"G4PAIPhotonModel::SampleSecondary gamma deltaTkin = "<<deltaTkin<<G4endl;
843	}
844	if( deltaTkin <= 0.) return;
845
846	G4double costheta = 0.; // G4UniformRand(); // VG: ??? for start only
847	G4double sintheta = sqrt((1.+costheta)*(1.-costheta));
848
849	// direction of the 'Cherenkov' photon
850	G4double phi = twopi*G4UniformRand();
851	G4double dirx = sinthetacos(phi), diry = sinthetasin(phi), dirz = costheta;
852
853	G4ThreeVector deltaDirection(dirx,diry,dirz);
854	deltaDirection.rotateUz(direction);
855
856	// primary change
857	kineticEnergy -= deltaTkin;
858
859	// create G4DynamicParticle object for photon ray
860
861	G4DynamicParticle* photonRay = new G4DynamicParticle;
862	photonRay->SetDefinition( G4Gamma::Gamma() );
863	photonRay->SetKineticEnergy( deltaTkin );
864	photonRay->SetMomentumDirection(deltaDirection);
865
866	vdp->push_back(photonRay);
867	}
868
869	fParticleChange->SetProposedKineticEnergy(kineticEnergy);
870	}
871
872
873	///////////////////////////////////////////////////////////////////////
874	//
875	// Returns post step PAI energy transfer > cut electron/photon energy according to passed
876	// scaled kinetic energy of particle
877
878	G4double
879	G4PAIPhotonModel::GetPostStepTransfer( G4PhysicsTable* pTable,
880	G4PhysicsLogVector* pVector,
881	G4int iPlace, G4double scaledTkin )
882	{
883	// G4cout<<"G4PAIPhotonModel::GetPostStepTransfer"<<G4endl ;
884
885	G4int iTkin = iPlace+1, iTransfer;
886	G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ;
887
888	dNdxCut1 = (*pVector)(iPlace) ;
889
890	// G4cout<<"iPlace = "<<iPlace<<endl ;
891
892	if(iTkin == fTotBin) // Fermi plato, try from left
893	{
894	position = dNdxCut1*G4UniformRand() ;
895
896	for( iTransfer = 0;
897	iTransfer < G4int((*pTable)(iPlace)->GetVectorLength()); iTransfer++ )
898	{
899	if(position >= ((pTable)(iPlace))(iTransfer)) break ;
900	}
901	transfer = GetEnergyTransfer(pTable,iPlace,position,iTransfer);
902	}
903	else
904	{
905	dNdxCut2 = (*pVector)(iPlace+1) ;
906	if(iTkin == 0) // Tkin is too small, trying from right only
907	{
908	position = dNdxCut2*G4UniformRand() ;
909
910	for( iTransfer = 0;
911	iTransfer < G4int((*pTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
912	{
913	if(position >= ((pTable)(iPlace+1))(iTransfer)) break ;
914	}
915	transfer = GetEnergyTransfer(pTable,iPlace+1,position,iTransfer);
916	}
917	else // general case: Tkin between two vectors of the material
918	{
919	E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ;
920	E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin) ;
921	W = 1.0/(E2 - E1) ;
922	W1 = (E2 - scaledTkin)*W ;
923	W2 = (scaledTkin - E1)*W ;
924
925	position = ( dNdxCut1W1 + dNdxCut2W2 )*G4UniformRand() ;
926
927	// G4cout<<position<<"\t" ;
928
929	G4int iTrMax1, iTrMax2, iTrMax;
930
931	iTrMax1 = G4int((*pTable)(iPlace)->GetVectorLength());
932	iTrMax2 = G4int((*pTable)(iPlace+1)->GetVectorLength());
933
934	if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2;
935	else iTrMax = iTrMax1;
936
937	for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ )
938	{
939	if( position >=
940	( ((pTable)(iPlace))(iTransfer)*W1 +
941	((pTable)(iPlace+1))(iTransfer)*W2) ) break ;
942	}
943	transfer = GetEnergyTransfer(pTable, iPlace, position, iTransfer);
944	}
945	}
946	// G4cout<<"PAIPhotonModel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ;
947	if(transfer < 0.0 ) transfer = 0.0 ;
948	return transfer ;
949	}
950
951	///////////////////////////////////////////////////////////////////////
952	//
953	// Returns random PAI energy transfer according to passed
954	// indexes of particle
955
956	G4double
957	G4PAIPhotonModel::GetEnergyTransfer( G4PhysicsTable* pTable, G4int iPlace,
958	G4double position, G4int iTransfer )
959	{
960	G4int iTransferMax;
961	G4double x1, x2, y1, y2, energyTransfer;
962
963	if(iTransfer == 0)
964	{
965	energyTransfer = (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
966	}
967	else
968	{
969	iTransferMax = G4int((*pTable)(iPlace)->GetVectorLength());
970
971	if ( iTransfer >= iTransferMax) iTransfer = iTransferMax - 1;
972
973	y1 = ((pTable)(iPlace))(iTransfer-1);
974	y2 = ((fPAItransferTable)(iPlace))(iTransfer);
975
976	x1 = (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1);
977	x2 = (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer);
978
979	if ( x1 == x2 ) energyTransfer = x2;
980	else
981	{
982	if ( y1 == y2 ) energyTransfer = x1 + (x2 - x1)*G4UniformRand();
983	else
984	{
985	energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1);
986	}
987	}
988	}
989	return energyTransfer;
990	}
991
992	///////////////////////////////////////////////////////////////////////
993	//
994	// Works like AlongStepDoIt method of process family
995
996
997
998
999	G4double G4PAIPhotonModel::SampleFluctuations( const G4Material* material,
1000	const G4DynamicParticle* aParticle,
1001	G4double&,
1002	G4double& step,
1003	G4double&)
1004	{
1005	size_t jMat;
1006	for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat )
1007	{
1008	if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break;
1009	}
1010	if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--;
1011
1012	fPAItransferTable = fPAIxscBank[jMat];
1013	fPAIphotonTable = fPAIphotonBank[jMat];
1014	fPAIplasmonTable = fPAIplasmonBank[jMat];
1015
1016	fdNdxCutVector = fdNdxCutTable[jMat];
1017	fdNdxCutPhotonVector = fdNdxCutPhotonTable[jMat];
1018	fdNdxCutPlasmonVector = fdNdxCutPlasmonTable[jMat];
1019
1020	G4int iTkin, iPlace ;
1021
1022	// G4cout<<"G4PAIPhotonModel::SampleFluctuations"<<G4endl ;
1023
1024	G4double loss, photonLoss, plasmonLoss, charge2 ;
1025
1026
1027	G4double Tkin = aParticle->GetKineticEnergy() ;
1028	G4double MassRatio = proton_mass_c2/aParticle->GetDefinition()->GetPDGMass() ;
1029	G4double charge = aParticle->GetDefinition()->GetPDGCharge() ;
1030	charge2 = charge*charge ;
1031	G4double scaledTkin = Tkin*MassRatio ;
1032	G4double cof = step*charge2;
1033
1034	for( iTkin = 0; iTkin < fTotBin; iTkin++)
1035	{
1036	if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) break ;
1037	}
1038	iPlace = iTkin - 1 ;
1039	if( iPlace < 0 ) iPlace = 0;
1040
1041	photonLoss = GetAlongStepTransfer(fPAIphotonTable,fdNdxCutPhotonVector,
1042	iPlace,scaledTkin,step,cof);
1043
1044	// G4cout<<"PAIPhotonModel AlongStepPhotonLoss = "<<photonLoss/keV<<" keV"<<G4endl ;
1045
1046	plasmonLoss = GetAlongStepTransfer(fPAIplasmonTable,fdNdxCutPlasmonVector,
1047	iPlace,scaledTkin,step,cof);
1048
1049	// G4cout<<"PAIPhotonModel AlongStepPlasmonLoss = "<<plasmonLoss/keV<<" keV"<<G4endl ;
1050
1051	loss = photonLoss + plasmonLoss;
1052
1053	// G4cout<<"PAIPhotonModel AlongStepLoss = "<<loss/keV<<" keV"<<G4endl ;
1054
1055	return loss;
1056	}
1057
1058	///////////////////////////////////////////////////////////////////////
1059	//
1060	// Returns along step PAI energy transfer < cut electron/photon energy according to passed
1061	// scaled kinetic energy of particle and cof = stepchargecharge
1062
1063	G4double
1064	G4PAIPhotonModel::GetAlongStepTransfer( G4PhysicsTable* pTable,
1065	G4PhysicsLogVector* pVector,
1066	G4int iPlace, G4double scaledTkin,G4double step,
1067	G4double cof )
1068	{
1069	G4int iTkin = iPlace + 1, iTransfer;
1070	G4double loss = 0., position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber;
1071	G4double lambda, stepDelta, stepSum=0. ;
1072	G4long numOfCollisions=0;
1073	G4bool numb = true;
1074
1075	dNdxCut1 = (*pVector)(iPlace) ;
1076
1077	// G4cout<<"iPlace = "<<iPlace<<endl ;
1078
1079	if(iTkin == fTotBin) // Fermi plato, try from left
1080	{
1081	meanNumber = (((pTable)(iPlace))(0) - dNdxCut1)*cof;
1082	if(meanNumber < 0.) meanNumber = 0. ;
1083	// numOfCollisions = RandPoisson::shoot(meanNumber) ;
1084	if( meanNumber > 0.) lambda = step/meanNumber;
1085	else lambda = DBL_MAX;
1086	while(numb)
1087	{
1088	stepDelta = CLHEP::RandExponential::shoot(lambda);
1089	stepSum += stepDelta;
1090	if(stepSum >= step) break;
1091	numOfCollisions++;
1092	}
1093
1094	// G4cout<<"numOfCollisions = "<<numOfCollisions<<G4endl ;
1095
1096	while(numOfCollisions)
1097	{
1098	position = dNdxCut1+
1099	(((pTable)(iPlace))(0) - dNdxCut1)*G4UniformRand() ;
1100
1101	for( iTransfer = 0;
1102	iTransfer < G4int((*pTable)(iPlace)->GetVectorLength()); iTransfer++ )
1103	{
1104	if(position >= ((pTable)(iPlace))(iTransfer)) break ;
1105	}
1106	loss += GetEnergyTransfer(pTable,iPlace,position,iTransfer);
1107	numOfCollisions-- ;
1108	}
1109	}
1110	else
1111	{
1112	dNdxCut2 = (*pVector)(iPlace+1) ;
1113
1114	if(iTkin == 0) // Tkin is too small, trying from right only
1115	{
1116	meanNumber = (((pTable)(iPlace+1))(0) - dNdxCut2)*cof;
1117	if( meanNumber < 0. ) meanNumber = 0. ;
1118	// numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
1119	if( meanNumber > 0.) lambda = step/meanNumber;
1120	else lambda = DBL_MAX;
1121	while(numb)
1122	{
1123	stepDelta = CLHEP::RandExponential::shoot(lambda);
1124	stepSum += stepDelta;
1125	if(stepSum >= step) break;
1126	numOfCollisions++;
1127	}
1128
1129	// G4cout<<"numOfCollisions = "<<numOfCollisions<<G4endl ;
1130
1131	while(numOfCollisions)
1132	{
1133	position = dNdxCut2+
1134	(((pTable)(iPlace+1))(0) - dNdxCut2)*G4UniformRand();
1135
1136	for( iTransfer = 0;
1137	iTransfer < G4int((*pTable)(iPlace+1)->GetVectorLength()); iTransfer++ )
1138	{
1139	if(position >= ((pTable)(iPlace+1))(iTransfer)) break ;
1140	}
1141	loss += GetEnergyTransfer(pTable,iPlace+1,position,iTransfer);
1142	numOfCollisions-- ;
1143	}
1144	}
1145	else // general case: Tkin between two vectors of the material
1146	{
1147	E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ;
1148	E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin) ;
1149	W = 1.0/(E2 - E1) ;
1150	W1 = (E2 - scaledTkin)*W ;
1151	W2 = (scaledTkin - E1)*W ;
1152
1153	// G4cout<<"((pTable)(iPlace))(0) = "<<
1154	// ((pTable)(iPlace))(0)<<G4endl ;
1155	// G4cout<<"((pTable)(iPlace+1))(0) = "<<
1156	// ((pTable)(iPlace+1))(0)<<G4endl ;
1157
1158	meanNumber=( (((pTable)(iPlace))(0)-dNdxCut1)*W1 +
1159	(((pTable)(iPlace+1))(0)-dNdxCut2)W2 )cof;
1160	if(meanNumber<0.0) meanNumber = 0.0;
1161	// numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ;
1162	if( meanNumber > 0.) lambda = step/meanNumber;
1163	else lambda = DBL_MAX;
1164	while(numb)
1165	{
1166	stepDelta = CLHEP::RandExponential::shoot(lambda);
1167	stepSum += stepDelta;
1168	if(stepSum >= step) break;
1169	numOfCollisions++;
1170	}
1171
1172	// G4cout<<"numOfCollisions = "<<numOfCollisions<<endl ;
1173
1174	while(numOfCollisions)
1175	{
1176	position = dNdxCut1W1 + dNdxCut2W2 +
1177	( ( ((pTable)(iPlace ))(0) - dNdxCut1)*W1 +
1178
1179	( ((pTable)(iPlace+1))(0) - dNdxCut2)W2 )G4UniformRand();
1180
1181	// G4cout<<position<<"\t" ;
1182
1183	for( iTransfer = 0;
1184	iTransfer < G4int((*pTable)(iPlace)->GetVectorLength()); iTransfer++ )
1185	{
1186	if( position >=
1187	( ((pTable)(iPlace))(iTransfer)*W1 +
1188	((pTable)(iPlace+1))(iTransfer)*W2) )
1189	{
1190	break ;
1191	}
1192	}
1193	// loss += (*pTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ;
1194	loss += GetEnergyTransfer(pTable,iPlace,position,iTransfer);
1195	numOfCollisions-- ;
1196	}
1197	}
1198	}
1199
1200	return loss ;
1201
1202	}
1203
1204	//////////////////////////////////////////////////////////////////////
1205	//
1206	// Returns the statistical estimation of the energy loss distribution variance
1207	//
1208
1209
1210	G4double G4PAIPhotonModel::Dispersion( const G4Material* material,
1211	const G4DynamicParticle* aParticle,
1212	G4double& tmax,
1213	G4double& step )
1214	{
1215	G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.;
1216	for(G4int i = 0 ; i < fMeanNumber; i++)
1217	{
1218	loss = SampleFluctuations(material,aParticle,tmax,step,meanLoss);
1219	sumLoss += loss;
1220	sumLoss2 += loss*loss;
1221	}
1222	meanLoss = sumLoss/fMeanNumber;
1223	sigma2 = meanLossmeanLoss + (sumLoss2-2sumLoss*meanLoss)/fMeanNumber;
1224	return sigma2;
1225	}
1226
1227
1228	//
1229	//
1230	/////////////////////////////////////////////////
1231
1232
1233
1234
1235
1236

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