1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4AdjointPhotoElectricModel.cc,v 1.5 2009/12/16 17:50:05 gunter Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-03 $ |
---|
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 | // |
---|
43 | G4AdjointPhotoElectricModel::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 | // |
---|
59 | G4AdjointPhotoElectricModel::~G4AdjointPhotoElectricModel() |
---|
60 | {;} |
---|
61 | |
---|
62 | //////////////////////////////////////////////////////////////////////////////// |
---|
63 | // |
---|
64 | void 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 | // |
---|
162 | void 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 | |
---|
182 | G4double 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 | |
---|
217 | G4double 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 | |
---|
249 | void 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 | } |
---|