source: trunk/source/processes/electromagnetic/adjoint/src/G4AdjointPhotoElectricModel.cc@ 1340

Last change on this file since 1340 was 1337, checked in by garnier, 15 years ago

tag geant4.9.4 beta 1 + modifs locales
File size: 9.8 KB
Line 
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25//
26// $Id: G4AdjointPhotoElectricModel.cc,v 1.5 2009/12/16 17:50:05 gunter Exp $
27// GEANT4 tag $Name: geant4-09-04-beta-01 $
28//
29#include "G4AdjointPhotoElectricModel.hh"
30#include "G4AdjointCSManager.hh"
31
32
33#include "G4Integrator.hh"
34#include "G4TrackStatus.hh"
35#include "G4ParticleChange.hh"
36#include "G4AdjointElectron.hh"
37#include "G4Gamma.hh"
38#include "G4AdjointGamma.hh"
39
40
41////////////////////////////////////////////////////////////////////////////////
42//
43G4AdjointPhotoElectricModel::G4AdjointPhotoElectricModel():
44 G4VEmAdjointModel("AdjointPEEffect")
45
46{ SetUseMatrix(false);
47 SetApplyCutInRange(false);
48 current_eEnergy =0.;
49 totAdjointCS=0.;
50 theAdjEquivOfDirectPrimPartDef =G4AdjointGamma::AdjointGamma();
51 theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron();
52 theDirectPrimaryPartDef=G4Gamma::Gamma();
53 second_part_of_same_type=false;
54 theDirectPEEffectModel = new G4PEEffectModel();
55
56}
57////////////////////////////////////////////////////////////////////////////////
58//
59G4AdjointPhotoElectricModel::~G4AdjointPhotoElectricModel()
60{;}
61
62////////////////////////////////////////////////////////////////////////////////
63//
64void G4AdjointPhotoElectricModel::SampleSecondaries(const G4Track& aTrack,
65 G4bool IsScatProjToProjCase,
66 G4ParticleChange* fParticleChange)
67{ if (IsScatProjToProjCase) return ;
68
69 //Compute the totAdjointCS vectors if not already done for the current couple and electron energy
70 //-----------------------------------------------------------------------------------------------
71 const G4MaterialCutsCouple* aCouple = aTrack.GetMaterialCutsCouple();
72 const G4DynamicParticle* aDynPart = aTrack.GetDynamicParticle() ;
73 G4double electronEnergy = aDynPart->GetKineticEnergy();
74 G4ThreeVector electronDirection= aDynPart->GetMomentumDirection() ;
75 pre_step_AdjointCS = totAdjointCS; //The last computed CS was at pre step point
76 G4double adjCS;
77 adjCS = AdjointCrossSection(aCouple, electronEnergy,IsScatProjToProjCase);
78 post_step_AdjointCS = totAdjointCS;
79
80
81
82
83 //Sample element
84 //-------------
85 const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
86 size_t nelm = currentMaterial->GetNumberOfElements();
87 G4double rand_CS= G4UniformRand()*xsec[nelm-1];
88 for (index_element=0; index_element<nelm-1; index_element++){
89 if (rand_CS<xsec[index_element]) break;
90 }
91
92 //Sample shell and binding energy
93 //-------------
94 G4int nShells = (*theElementVector)[index_element]->GetNbOfAtomicShells();
95 rand_CS= shell_prob[index_element][nShells-1]*G4UniformRand();
96 G4int i = 0;
97 for (i=0; i<nShells-1; i++){
98 if (rand_CS<shell_prob[index_element][i]) break;
99 }
100 G4double gammaEnergy= electronEnergy+(*theElementVector)[index_element]->GetAtomicShell(i);
101
102 //Sample cos theta
103 //Copy of the G4PEEffectModel cos theta sampling method ElecCosThetaDistribution.
104 //This method cannot be used directly from G4PEEffectModel because it is a friend method. I should ask Vladimir to change that
105 //------------------------------------------------------------------------------------------------
106 //G4double cos_theta = theDirectPEEffectModel->ElecCosThetaDistribution(electronEnergy);
107
108 G4double cos_theta = 1.;
109 G4double gamma = 1. + electronEnergy/electron_mass_c2;
110 if (gamma <= 5.) {
111 G4double beta = std::sqrt(gamma*gamma-1.)/gamma;
112 G4double b = 0.5*gamma*(gamma-1.)*(gamma-2);
113
114 G4double rndm,term,greject,grejsup;
115 if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b);
116 else grejsup = gamma*gamma*(1.+b+beta*b);
117
118 do { rndm = 1.-2*G4UniformRand();
119 cos_theta = (rndm+beta)/(rndm*beta+1.);
120 term = 1.-beta*cos_theta;
121 greject = (1.-cos_theta*cos_theta)*(1.+b*term)/(term*term);
122 } while(greject < G4UniformRand()*grejsup);
123 }
124
125 // direction of the adjoint gamma electron
126 //---------------------------------------
127
128
129 G4double sin_theta = std::sqrt(1.-cos_theta*cos_theta);
130 G4double Phi = twopi * G4UniformRand();
131 G4double dirx = sin_theta*std::cos(Phi),diry = sin_theta*std::sin(Phi),dirz = cos_theta;
132 G4ThreeVector adjoint_gammaDirection(dirx,diry,dirz);
133 adjoint_gammaDirection.rotateUz(electronDirection);
134
135
136
137 //Weight correction
138 //-----------------------
139 CorrectPostStepWeight(fParticleChange, aTrack.GetWeight(), electronEnergy,gammaEnergy,IsScatProjToProjCase);
140
141
142
143 //Create secondary and modify fParticleChange
144 //--------------------------------------------
145 G4DynamicParticle* anAdjointGamma = new G4DynamicParticle (
146 G4AdjointGamma::AdjointGamma(),adjoint_gammaDirection, gammaEnergy);
147
148
149
150
151
152 fParticleChange->ProposeTrackStatus(fStopAndKill);
153 fParticleChange->AddSecondary(anAdjointGamma);
154
155
156
157
158}
159
160////////////////////////////////////////////////////////////////////////////////
161//
162void G4AdjointPhotoElectricModel::CorrectPostStepWeight(G4ParticleChange* fParticleChange,
163 G4double old_weight,
164 G4double adjointPrimKinEnergy,
165 G4double projectileKinEnergy ,
166 G4bool )
167{
168 G4double new_weight=old_weight;
169
170 G4double w_corr =G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection()/factorCSBiasing;
171 w_corr*=post_step_AdjointCS/pre_step_AdjointCS;
172 new_weight*=w_corr;
173 new_weight*=projectileKinEnergy/adjointPrimKinEnergy;
174 fParticleChange->SetParentWeightByProcess(false);
175 fParticleChange->SetSecondaryWeightByProcess(false);
176 fParticleChange->ProposeParentWeight(new_weight);
177}
178
179////////////////////////////////////////////////////////////////////////////////
180//
181
182G4double G4AdjointPhotoElectricModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
183 G4double electronEnergy,
184 G4bool IsScatProjToProjCase)
185{
186
187
188 if (IsScatProjToProjCase) return 0.;
189
190
191 if (aCouple !=currentCouple || current_eEnergy !=electronEnergy) {
192 totAdjointCS = 0.;
193 DefineCurrentMaterialAndElectronEnergy(aCouple, electronEnergy);
194 const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
195 const double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume();
196 size_t nelm = currentMaterial->GetNumberOfElements();
197 for (index_element=0;index_element<nelm;index_element++){
198
199 totAdjointCS +=AdjointCrossSectionPerAtom((*theElementVector)[index_element],electronEnergy)*theAtomNumDensityVector[index_element];
200 xsec[index_element] = totAdjointCS;
201 }
202
203 totBiasedAdjointCS=std::min(totAdjointCS,0.01);
204// totBiasedAdjointCS=totAdjointCS;
205 factorCSBiasing = totBiasedAdjointCS/totAdjointCS;
206 lastCS=totBiasedAdjointCS;
207
208
209 }
210 return totBiasedAdjointCS;
211
212
213}
214////////////////////////////////////////////////////////////////////////////////
215//
216
217G4double G4AdjointPhotoElectricModel::AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy)
218{
219 G4int nShells = anElement->GetNbOfAtomicShells();
220 G4double Z= anElement->GetZ();
221 G4int i = 0;
222 G4double B0=anElement->GetAtomicShell(0);
223 G4double gammaEnergy = electronEnergy+B0;
224 G4double CS= theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,0.,0.,0.);
225 G4double adjointCS =0.;
226 if (CS >0) adjointCS += CS/gammaEnergy;
227 shell_prob[index_element][0] = adjointCS;
228 for (i=1;i<nShells;i++){
229 //G4cout<<i<<G4endl;
230 G4double Bi_= anElement->GetAtomicShell(i-1);
231 G4double Bi = anElement->GetAtomicShell(i);
232 //G4cout<<Bi_<<'\t'<<Bi<<G4endl;
233 if (electronEnergy <Bi_-Bi) {
234 gammaEnergy = electronEnergy+Bi;
235
236 CS=theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,0.,0.,0.);
237 if (CS>0) adjointCS +=CS/gammaEnergy;
238 }
239 shell_prob[index_element][i] = adjointCS;
240
241 }
242 adjointCS*=electronEnergy;
243 return adjointCS;
244
245}
246////////////////////////////////////////////////////////////////////////////////
247//
248
249void G4AdjointPhotoElectricModel::DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* couple, G4double anEnergy)
250{ currentCouple = const_cast<G4MaterialCutsCouple*> (couple);
251 currentMaterial = const_cast<G4Material*> (couple->GetMaterial());
252 currentCoupleIndex = couple->GetIndex();
253 currentMaterialIndex = currentMaterial->GetIndex();
254 current_eEnergy = anEnergy;
255}
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