source: trunk/source/processes/electromagnetic/adjoint/src/G4AdjointPhotoElectricModel.cc@ 1036

Last change on this file since 1036 was 966, checked in by garnier, 17 years ago

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[966]1//
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25//
26#include "G4AdjointPhotoElectricModel.hh"
27#include "G4AdjointCSManager.hh"
28
29
30#include "G4Integrator.hh"
31#include "G4TrackStatus.hh"
32#include "G4ParticleChange.hh"
33#include "G4AdjointElectron.hh"
34#include "G4Gamma.hh"
35#include "G4AdjointGamma.hh"
36
37////////////////////////////////////////////////////////////////////////////////
38//
39G4AdjointPhotoElectricModel::G4AdjointPhotoElectricModel():
40 G4VEmAdjointModel("AdjointPEEffect")
41
42{ SetUseMatrix(false);
43 current_eEnergy =0.;
44 totAdjointCS=0.;
45}
46////////////////////////////////////////////////////////////////////////////////
47//
48G4AdjointPhotoElectricModel::~G4AdjointPhotoElectricModel()
49{;}
50
51////////////////////////////////////////////////////////////////////////////////
52//
53void G4AdjointPhotoElectricModel::SampleSecondaries(const G4Track& aTrack,
54 G4bool IsScatProjToProjCase,
55 G4ParticleChange* fParticleChange)
56{ if (IsScatProjToProjCase) return ;
57
58 //Compute the totAdjointCS vectors if not already done for the current couple and electron energy
59 const G4MaterialCutsCouple* aCouple = aTrack.GetMaterialCutsCouple();
60 const G4DynamicParticle* aDynPart = aTrack.GetDynamicParticle() ;
61 G4double electronEnergy = aDynPart->GetKineticEnergy();
62 G4ThreeVector electronDirection= aDynPart->GetMomentumDirection() ;
63 totAdjointCS = AdjointCrossSection(aCouple, electronEnergy,IsScatProjToProjCase);
64
65
66 //Sample gamma energy
67 //-------------
68 /////////////////////////////////////////////////////////////////////////////////
69// Module: G4ContinuousGainOfEnergy.hh
70// Author: L. Desorgher
71// Date: 1 September 2007
72// Organisation: SpaceIT GmbH
73// Customer: ESA/ESTEC
74/////////////////////////////////////////////////////////////////////////////////
75//
76// CHANGE HISTORY
77// --------------
78// ChangeHistory:
79// 1 September 2007 creation by L. Desorgher
80//
81//-------------------------------------------------------------
82// Documentation:
83// Modell for the adjoint compton scattering
84//
85
86 //Sample element
87 //-------------
88 const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
89 const G4double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume();
90 size_t nelm = currentMaterial->GetNumberOfElements();
91 G4double rand_CS= totAdjointCS*G4UniformRand();
92 for (index_element=0; index_element<nelm-1; index_element++){
93 if (rand_CS<xsec[index_element]) break;
94 }
95
96 //Sample shell and binding energy
97 //-------------
98 rand_CS= totAdjointCS*G4UniformRand()/theAtomNumDensityVector[index_element];
99 G4int nShells = (*theElementVector)[index_element]->GetNbOfAtomicShells();
100 G4int i = 0;
101 for (i=0; i<nShells-1; i++){
102 if (rand_CS<shell_prob[index_element][i]) break;
103 }
104 G4double gammaEnergy= electronEnergy+(*theElementVector)[index_element]->GetAtomicShell(i);
105
106 //Sample cos theta
107 //Copy of the G4PEEffectModel cos theta sampling method ElecCosThetaDistribution.
108 //This method cannot be used directly from G4PEEffectModel because it is a friend method. I should ask Vladimir to change that
109 //------------------------------------------------------------------------------------------------
110 //G4double cos_theta = theDirectPEEffectModel->ElecCosThetaDistribution(electronEnergy);
111
112 G4double cos_theta = 1.;
113 G4double gamma = 1. + electronEnergy/electron_mass_c2;
114 if (gamma <= 5.) {
115 G4double beta = std::sqrt(gamma*gamma-1.)/gamma;
116 G4double b = 0.5*gamma*(gamma-1.)*(gamma-2);
117
118 G4double rndm,term,greject,grejsup;
119 if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b);
120 else grejsup = gamma*gamma*(1.+b+beta*b);
121
122 do { rndm = 1.-2*G4UniformRand();
123 cos_theta = (rndm+beta)/(rndm*beta+1.);
124 term = 1.-beta*cos_theta;
125 greject = (1.-cos_theta*cos_theta)*(1.+b*term)/(term*term);
126 } while(greject < G4UniformRand()*grejsup);
127 }
128
129 // direction of the adjoint gamma electron
130 //---------------------------------------
131
132
133 G4double sin_theta = std::sqrt(1.-cos_theta*cos_theta);
134 G4double Phi = twopi * G4UniformRand();
135 G4double dirx = sin_theta*std::cos(Phi),diry = sin_theta*std::sin(Phi),dirz = cos_theta;
136 G4ThreeVector adjoint_gammaDirection(dirx,diry,dirz);
137 adjoint_gammaDirection.rotateUz(electronDirection);
138
139
140
141 //Weight correction
142 //-----------------------
143 CorrectPostStepWeight(fParticleChange, aTrack.GetWeight(), electronEnergy,gammaEnergy);
144
145
146
147 //Create secondary and modify fParticleChange
148 //--------------------------------------------
149 G4DynamicParticle* anAdjointGamma = new G4DynamicParticle (
150 G4AdjointGamma::AdjointGamma(),adjoint_gammaDirection, gammaEnergy);
151 fParticleChange->ProposeTrackStatus(fStopAndKill);
152 fParticleChange->AddSecondary(anAdjointGamma);
153
154
155
156
157
158}
159
160////////////////////////////////////////////////////////////////////////////////
161//
162
163G4double G4AdjointPhotoElectricModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
164 G4double electronEnergy,
165 G4bool IsScatProjToProjCase)
166{ if (IsScatProjToProjCase) return 0.;
167 if (aCouple !=currentCouple || current_eEnergy !=electronEnergy) {
168 totAdjointCS = 0.;
169 DefineCurrentMaterialAndElectronEnergy(aCouple, electronEnergy);
170 const G4ElementVector* theElementVector = currentMaterial->GetElementVector();
171 const G4double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume();
172 size_t nelm = currentMaterial->GetNumberOfElements();
173 for (index_element=0;index_element<nelm;index_element++){
174
175 totAdjointCS +=AdjointCrossSectionPerAtom((*theElementVector)[index_element],electronEnergy)*theAtomNumDensityVector[index_element];
176 xsec[index_element] = totAdjointCS;
177 }
178 }
179 return totAdjointCS;
180
181
182}
183////////////////////////////////////////////////////////////////////////////////
184//
185
186G4double G4AdjointPhotoElectricModel::AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy)
187{
188 G4int nShells = anElement->GetNbOfAtomicShells();
189 G4double Z= anElement->GetZ();
190 G4double N= anElement->GetN();
191 G4int i = 0;
192 G4double B0=anElement->GetAtomicShell(0);
193 G4double gammaEnergy = electronEnergy+B0;
194 G4double adjointCS = theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,N,0.,0.)*electronEnergy/gammaEnergy;
195 shell_prob[index_element][0] = adjointCS;
196 for (i=1;i<nShells;i++){
197 //G4cout<<i<<std::endl;
198 G4double Bi_= anElement->GetAtomicShell(i-1);
199 G4double Bi = anElement->GetAtomicShell(i);
200 //G4cout<<Bi_<<'\t'<<Bi<<std::endl;
201 if (electronEnergy <Bi_-Bi) {
202 gammaEnergy = electronEnergy+Bi;
203 adjointCS +=theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,anElement->GetZ(),N,0.,0.)*electronEnergy/gammaEnergy;
204 }
205 shell_prob[index_element][i] = adjointCS;
206
207 }
208
209 return adjointCS;
210
211}
212////////////////////////////////////////////////////////////////////////////////
213//
214
215void G4AdjointPhotoElectricModel::DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* couple, G4double anEnergy)
216{ currentCouple = const_cast<G4MaterialCutsCouple*> (couple);
217 currentMaterial = const_cast<G4Material*> (couple->GetMaterial());
218 currentCoupleIndex = couple->GetIndex();
219 currentMaterialIndex = currentMaterial->GetIndex();
220 current_eEnergy = anEnergy;
221}
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