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26 << 26 // $Id: G4AdjointBremsstrahlungModel.cc,v 1.5 2009/12/16 17:50:01 gunter Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03 $
>> 28 //
27 #include "G4AdjointBremsstrahlungModel.hh" 29 #include "G4AdjointBremsstrahlungModel.hh"
28 <<
29 #include "G4AdjointCSManager.hh" 30 #include "G4AdjointCSManager.hh"
>> 31 #include "G4Integrator.hh"
>> 32 #include "G4TrackStatus.hh"
>> 33 #include "G4ParticleChange.hh"
30 #include "G4AdjointElectron.hh" 34 #include "G4AdjointElectron.hh"
31 #include "G4AdjointGamma.hh" 35 #include "G4AdjointGamma.hh"
32 #include "G4Electron.hh" 36 #include "G4Electron.hh"
33 #include "G4EmModelManager.hh" <<
34 #include "G4Gamma.hh" <<
35 #include "G4ParticleChange.hh" <<
36 #include "G4PhysicalConstants.hh" <<
37 #include "G4SeltzerBergerModel.hh" <<
38 #include "G4SystemOfUnits.hh" <<
39 #include "G4TrackStatus.hh" <<
40 37
41 ////////////////////////////////////////////// << 38 #include "G4Timer.hh"
42 G4AdjointBremsstrahlungModel::G4AdjointBremsst << 39 //#include "G4PenelopeBremsstrahlungModel.hh"
43 : G4VEmAdjointModel("AdjointeBremModel") <<
44 { <<
45 fDirectModel = aModel; <<
46 Initialize(); <<
47 } <<
48 40
49 ////////////////////////////////////////////// <<
50 G4AdjointBremsstrahlungModel::G4AdjointBremsst <<
51 : G4VEmAdjointModel("AdjointeBremModel") <<
52 { <<
53 fDirectModel = new G4SeltzerBergerModel(); <<
54 Initialize(); <<
55 } <<
56 41
57 ////////////////////////////////////////////// 42 ////////////////////////////////////////////////////////////////////////////////
58 void G4AdjointBremsstrahlungModel::Initialize( << 43 //
59 { << 44 G4AdjointBremsstrahlungModel::G4AdjointBremsstrahlungModel():
>> 45 G4VEmAdjointModel("AdjointeBremModel"),
>> 46 MigdalConstant(classic_electr_radius*electron_Compton_length*electron_Compton_length*4.0*pi)
>> 47 {
60 SetUseMatrix(false); 48 SetUseMatrix(false);
61 SetUseMatrixPerElement(false); 49 SetUseMatrixPerElement(false);
62 << 50
63 fEmModelManagerForFwdModels = new G4EmModelM << 51 theDirectStdBremModel = new G4eBremsstrahlungModel(G4Electron::Electron(),"TheDirecteBremModel");
64 fEmModelManagerForFwdModels->AddEmModel(1, f << 52 theDirectEMModel=theDirectStdBremModel;
>> 53 // theDirectPenelopeBremModel =0;
>> 54
65 SetApplyCutInRange(true); 55 SetApplyCutInRange(true);
>> 56 highKinEnergy= 100.*TeV;
>> 57 lowKinEnergy = 1.0*keV;
>> 58 theTimer =new G4Timer();
>> 59
>> 60 theAdjEquivOfDirectPrimPartDef =G4AdjointElectron::AdjointElectron();
>> 61 theAdjEquivOfDirectSecondPartDef=G4AdjointGamma::AdjointGamma();
>> 62 theDirectPrimaryPartDef=G4Electron::Electron();
>> 63 second_part_of_same_type=false;
>> 64
>> 65 /*UsePenelopeModel=false;
>> 66 if (UsePenelopeModel) {
>> 67 G4PenelopeBremsstrahlungModel* thePenelopeModel = new G4PenelopeBremsstrahlungModel(G4Electron::Electron(),"PenelopeBrem");
>> 68 theEmModelManagerForFwdModels = new G4EmModelManager();
>> 69 isPenelopeModelInitialised = false;
>> 70 G4VEmFluctuationModel* f=0;
>> 71 G4Region* r=0;
>> 72 theDirectEMModel=thePenelopeModel;
>> 73 theEmModelManagerForFwdModels->AddEmModel(1, thePenelopeModel, f, r);
>> 74 }
>> 75 */
>> 76
66 77
67 fElectron = G4Electron::Electron(); << 78
68 fGamma = G4Gamma::Gamma(); <<
69 <<
70 fAdjEquivDirectPrimPart = G4AdjointElectro <<
71 fAdjEquivDirectSecondPart = G4AdjointGamma:: <<
72 fDirectPrimaryPart = fElectron; <<
73 fSecondPartSameType = false; <<
74 <<
75 fCSManager = G4AdjointCSManager::GetAdjointC <<
76 } <<
77 <<
78 ////////////////////////////////////////////// <<
79 G4AdjointBremsstrahlungModel::~G4AdjointBremss <<
80 { <<
81 if(fEmModelManagerForFwdModels) <<
82 delete fEmModelManagerForFwdModels; <<
83 } 79 }
84 80
85 ////////////////////////////////////////////// 81 ////////////////////////////////////////////////////////////////////////////////
86 void G4AdjointBremsstrahlungModel::SampleSecon << 82 //
87 const G4Track& aTrack, G4bool isScatProjToPr << 83 void G4AdjointBremsstrahlungModel::SampleSecondaries(const G4Track& aTrack,
88 G4ParticleChange* fParticleChange) << 84 G4bool IsScatProjToProjCase,
>> 85 G4ParticleChange* fParticleChange)
89 { 86 {
90 if(!fUseMatrix) << 87 if (!UseMatrix) return RapidSampleSecondaries(aTrack,IsScatProjToProjCase,fParticleChange);
91 return RapidSampleSecondaries(aTrack, isSc <<
92 88
93 const G4DynamicParticle* theAdjointPrimary = << 89 const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle();
94 DefineCurrentMaterial(aTrack.GetMaterialCuts << 90 DefineCurrentMaterial(aTrack.GetMaterialCutsCouple());
95 << 91
96 G4double adjointPrimKinEnergy = theAdjoint << 92
97 G4double adjointPrimTotalEnergy = theAdjoint << 93 G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy();
98 << 94 G4double adjointPrimTotalEnergy = theAdjointPrimary->GetTotalEnergy();
99 if(adjointPrimKinEnergy > GetHighEnergyLimit << 95
100 { << 96 if (adjointPrimKinEnergy>HighEnergyLimit*0.999){
101 return; << 97 return;
102 } << 98 }
>> 99
>> 100 G4double projectileKinEnergy = SampleAdjSecEnergyFromCSMatrix(adjointPrimKinEnergy,
>> 101 IsScatProjToProjCase);
>> 102 //Weight correction
>> 103 //-----------------------
>> 104 CorrectPostStepWeight(fParticleChange,
>> 105 aTrack.GetWeight(),
>> 106 adjointPrimKinEnergy,
>> 107 projectileKinEnergy,
>> 108 IsScatProjToProjCase);
>> 109
>> 110
>> 111 //Kinematic
>> 112 //---------
>> 113 G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
>> 114 G4double projectileTotalEnergy = projectileM0+projectileKinEnergy;
>> 115 G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0;
>> 116 G4double projectileP = std::sqrt(projectileP2);
>> 117
>> 118
>> 119 //Angle of the gamma direction with the projectile taken from G4eBremsstrahlungModel
>> 120 //------------------------------------------------
>> 121 G4double u;
>> 122 const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ;
103 123
104 G4double projectileKinEnergy = << 124 if (9./(9.+d) > G4UniformRand()) u = - std::log(G4UniformRand()*G4UniformRand())/a1;
105 SampleAdjSecEnergyFromCSMatrix(adjointPrim << 125 else u = - std::log(G4UniformRand()*G4UniformRand())/a2;
106 126
107 // Weight correction << 127 G4double theta = u*electron_mass_c2/projectileTotalEnergy;
108 CorrectPostStepWeight(fParticleChange, aTrac <<
109 adjointPrimKinEnergy, <<
110 isScatProjToProj); <<
111 <<
112 // Kinematic <<
113 G4double projectileM0 = fAdjEquivDi <<
114 G4double projectileTotalEnergy = projectileM <<
115 G4double projectileP2 = <<
116 projectileTotalEnergy * projectileTotalEne <<
117 G4double projectileP = std::sqrt(projectileP <<
118 128
119 // Angle of the gamma direction with the pro << 129 G4double sint = std::sin(theta);
120 // G4eBremsstrahlungModel << 130 G4double cost = std::cos(theta);
121 G4double u; << 131
122 if(0.25 > G4UniformRand()) << 132 G4double phi = twopi * G4UniformRand() ;
123 u = -std::log(G4UniformRand() * G4UniformR << 133
124 else << 134 G4ThreeVector projectileMomentum;
125 u = -std::log(G4UniformRand() * G4UniformR << 135 projectileMomentum=G4ThreeVector(std::cos(phi)*sint,std::sin(phi)*sint,cost)*projectileP; //gamma frame
126 << 136 if (IsScatProjToProjCase) {//the adjoint primary is the scattered e-
127 G4double theta = u * electron_mass_c2 / proj << 137 G4ThreeVector gammaMomentum = (projectileTotalEnergy-adjointPrimTotalEnergy)*G4ThreeVector(0.,0.,1.);
128 G4double sint = std::sin(theta); << 138 G4ThreeVector dirProd=projectileMomentum-gammaMomentum;
129 G4double cost = std::cos(theta); << 139 G4double cost1 = std::cos(dirProd.angle(projectileMomentum));
130 << 140 G4double sint1 = std::sqrt(1.-cost1*cost1);
131 G4double phi = twopi * G4UniformRand(); << 141 projectileMomentum=G4ThreeVector(std::cos(phi)*sint1,std::sin(phi)*sint1,cost1)*projectileP;
132 << 142
133 G4ThreeVector projectileMomentum = <<
134 G4ThreeVector(std::cos(phi) * sint, std::s <<
135 projectileP; // gamma frame <<
136 if(isScatProjToProj) <<
137 { // the adjoint primary is the scattered e <<
138 G4ThreeVector gammaMomentum = <<
139 (projectileTotalEnergy - adjointPrimTota <<
140 G4ThreeVector(0., 0., 1.); <<
141 G4ThreeVector dirProd = projectileMomentum <<
142 G4double cost1 = std::cos(dirProd.a <<
143 G4double sint1 = std::sqrt(1. - cos <<
144 projectileMomentum = <<
145 G4ThreeVector(std::cos(phi) * sint1, std <<
146 projectileP; <<
147 } 143 }
148 << 144
149 projectileMomentum.rotateUz(theAdjointPrimar 145 projectileMomentum.rotateUz(theAdjointPrimary->GetMomentumDirection());
150 << 146
151 if(!isScatProjToProj) << 147
152 { // kill the primary and add a secondary << 148
153 fParticleChange->ProposeTrackStatus(fStopA << 149 if (!IsScatProjToProjCase ){ //kill the primary and add a secondary
154 fParticleChange->AddSecondary( << 150 fParticleChange->ProposeTrackStatus(fStopAndKill);
155 new G4DynamicParticle(fAdjEquivDirectPri << 151 fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum));
156 } << 152 }
157 else << 153 else {
158 { << 154 fParticleChange->ProposeEnergy(projectileKinEnergy);
159 fParticleChange->ProposeEnergy(projectileK << 155 fParticleChange->ProposeMomentumDirection(projectileMomentum.unit());
160 fParticleChange->ProposeMomentumDirection( << 156
161 } << 157 }
162 } << 158 }
163 <<
164 ////////////////////////////////////////////// 159 ////////////////////////////////////////////////////////////////////////////////
165 void G4AdjointBremsstrahlungModel::RapidSample << 160 //
166 const G4Track& aTrack, G4bool isScatProjToPr << 161 void G4AdjointBremsstrahlungModel::RapidSampleSecondaries(const G4Track& aTrack,
167 G4ParticleChange* fParticleChange) << 162 G4bool IsScatProjToProjCase,
168 { << 163 G4ParticleChange* fParticleChange)
169 const G4DynamicParticle* theAdjointPrimary = << 164 {
170 DefineCurrentMaterial(aTrack.GetMaterialCuts << 165
171 << 166 const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle();
172 G4double adjointPrimKinEnergy = theAdjoint << 167 DefineCurrentMaterial(aTrack.GetMaterialCutsCouple());
173 G4double adjointPrimTotalEnergy = theAdjoint << 168
174 << 169
175 if(adjointPrimKinEnergy > GetHighEnergyLimit << 170 G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy();
176 { << 171 G4double adjointPrimTotalEnergy = theAdjointPrimary->GetTotalEnergy();
177 return; << 172
178 } << 173 if (adjointPrimKinEnergy>HighEnergyLimit*0.999){
>> 174 return;
>> 175 }
>> 176
>> 177 G4double projectileKinEnergy =0.;
>> 178 G4double gammaEnergy=0.;
>> 179 G4double diffCSUsed=0.;
>> 180 if (!IsScatProjToProjCase){
>> 181 gammaEnergy=adjointPrimKinEnergy;
>> 182 G4double Emax = GetSecondAdjEnergyMaxForProdToProjCase(adjointPrimKinEnergy);
>> 183 G4double Emin= GetSecondAdjEnergyMinForProdToProjCase(adjointPrimKinEnergy);;
>> 184 if (Emin>=Emax) return;
>> 185 projectileKinEnergy=Emin*std::pow(Emax/Emin,G4UniformRand());
>> 186 diffCSUsed=lastCZ/projectileKinEnergy;
>> 187
>> 188 }
>> 189 else { G4double Emax = GetSecondAdjEnergyMaxForScatProjToProjCase(adjointPrimKinEnergy);
>> 190 G4double Emin = GetSecondAdjEnergyMinForScatProjToProjCase(adjointPrimKinEnergy,currentTcutForDirectSecond);
>> 191 if (Emin>=Emax) return;
>> 192 G4double f1=(Emin-adjointPrimKinEnergy)/Emin;
>> 193 G4double f2=(Emax-adjointPrimKinEnergy)/Emax/f1;
>> 194 //G4cout<<"f1 and f2 "<<f1<<'\t'<<f2<<G4endl;
>> 195 projectileKinEnergy=adjointPrimKinEnergy/(1.-f1*std::pow(f2,G4UniformRand()));
>> 196 gammaEnergy=projectileKinEnergy-adjointPrimKinEnergy;
>> 197 diffCSUsed=lastCZ*adjointPrimKinEnergy/projectileKinEnergy/gammaEnergy;
>> 198
>> 199 }
>> 200
>> 201
>> 202
>> 203
>> 204 //Weight correction
>> 205 //-----------------------
>> 206 //First w_corr is set to the ratio between adjoint total CS and fwd total CS
>> 207 G4double w_corr=G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection();
>> 208
>> 209 //Then another correction is needed due to the fact that a biaised differential CS has been used rather than the one consistent with the direct model
>> 210 //Here we consider the true diffCS as the one obtained by the numericla differentiation over Tcut of the direct CS, corrected by the Migdal term.
>> 211 //Basically any other differential CS diffCS could be used here (example Penelope).
>> 212
>> 213 G4double diffCS = DiffCrossSectionPerVolumePrimToSecond(currentMaterial, projectileKinEnergy, gammaEnergy);
>> 214 w_corr*=diffCS/diffCSUsed;
>> 215
>> 216 G4double new_weight = aTrack.GetWeight()*w_corr;
>> 217 fParticleChange->SetParentWeightByProcess(false);
>> 218 fParticleChange->SetSecondaryWeightByProcess(false);
>> 219 fParticleChange->ProposeParentWeight(new_weight);
>> 220
>> 221 //Kinematic
>> 222 //---------
>> 223 G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
>> 224 G4double projectileTotalEnergy = projectileM0+projectileKinEnergy;
>> 225 G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0;
>> 226 G4double projectileP = std::sqrt(projectileP2);
>> 227
>> 228
>> 229 //Angle of the gamma direction with the projectile taken from G4eBremsstrahlungModel
>> 230 //------------------------------------------------
>> 231 G4double u;
>> 232 const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ;
179 233
180 G4double projectileKinEnergy = 0.; << 234 if (9./(9.+d) > G4UniformRand()) u = - std::log(G4UniformRand()*G4UniformRand())/a1;
181 G4double gammaEnergy = 0.; << 235 else u = - std::log(G4UniformRand()*G4UniformRand())/a2;
182 G4double diffCSUsed = 0.; <<
183 if(!isScatProjToProj) <<
184 { <<
185 gammaEnergy = adjointPrimKinEnergy; <<
186 G4double Emax = GetSecondAdjEnergyMaxForPr <<
187 G4double Emin = GetSecondAdjEnergyMinForPr <<
188 if(Emin >= Emax) <<
189 return; <<
190 projectileKinEnergy = Emin * std::pow(Emax <<
191 diffCSUsed = fCsBiasingFactor * f <<
192 } <<
193 else <<
194 { <<
195 G4double Emax = <<
196 GetSecondAdjEnergyMaxForScatProjToProj(a <<
197 G4double Emin = <<
198 GetSecondAdjEnergyMinForScatProjToProj(a <<
199 if(Emin >= Emax) <<
200 return; <<
201 G4double f1 = (Emin - adjointPrimKinEnergy <<
202 G4double f2 = (Emax - adjointPrimKinEnergy <<
203 projectileKinEnergy = <<
204 adjointPrimKinEnergy / (1. - f1 * std::p <<
205 gammaEnergy = projectileKinEnergy - adjoin <<
206 diffCSUsed = <<
207 fLastCZ * adjointPrimKinEnergy / project <<
208 } <<
209 236
210 // Weight correction: << 237 G4double theta = u*electron_mass_c2/projectileTotalEnergy;
211 // First w_corr is set to the ratio between <<
212 // if this has to be done in the model. <<
213 // For the case of forced interaction this w <<
214 // the forced interaction. It is important <<
215 // creation of the secondary <<
216 G4double w_corr = fOutsideWeightFactor; <<
217 if(fInModelWeightCorr) <<
218 { <<
219 w_corr = fCSManager->GetPostStepWeightCorr <<
220 } <<
221 238
222 // Then another correction is needed due to << 239 G4double sint = std::sin(theta);
223 // differential CS has been used rather than << 240 G4double cost = std::cos(theta);
224 // direct model Here we consider the true di << 241
225 // numerical differentiation over Tcut of th << 242 G4double phi = twopi * G4UniformRand() ;
226 // Migdal term. Basically any other differen << 243
227 // (example Penelope). << 244 G4ThreeVector projectileMomentum;
228 G4double diffCS = DiffCrossSectionPerVolumeP << 245 projectileMomentum=G4ThreeVector(std::cos(phi)*sint,std::sin(phi)*sint,cost)*projectileP; //gamma frame
229 fCurrentMaterial, projectileKinEnergy, gam << 246 if (IsScatProjToProjCase) {//the adjoint primary is the scattered e-
230 w_corr *= diffCS / diffCSUsed; << 247 G4ThreeVector gammaMomentum = (projectileTotalEnergy-adjointPrimTotalEnergy)*G4ThreeVector(0.,0.,1.);
231 << 248 G4ThreeVector dirProd=projectileMomentum-gammaMomentum;
232 G4double new_weight = aTrack.GetWeight() * w << 249 G4double cost1 = std::cos(dirProd.angle(projectileMomentum));
233 fParticleChange->SetParentWeightByProcess(fa << 250 G4double sint1 = std::sqrt(1.-cost1*cost1);
234 fParticleChange->SetSecondaryWeightByProcess << 251 projectileMomentum=G4ThreeVector(std::cos(phi)*sint1,std::sin(phi)*sint1,cost1)*projectileP;
235 fParticleChange->ProposeParentWeight(new_wei << 252
236 <<
237 // Kinematic <<
238 G4double projectileM0 = fAdjEquivDi <<
239 G4double projectileTotalEnergy = projectileM <<
240 G4double projectileP2 = <<
241 projectileTotalEnergy * projectileTotalEne <<
242 G4double projectileP = std::sqrt(projectileP <<
243 <<
244 // Use the angular model of the forward mode <<
245 // Dummy dynamic particle to use the model <<
246 G4DynamicParticle* aDynPart = <<
247 new G4DynamicParticle(fElectron, G4ThreeVe <<
248 <<
249 // Get the element from the direct model <<
250 const G4Element* elm = fDirectModel->SelectR <<
251 fCurrentCouple, fElectron, projectileKinEn <<
252 G4int Z = elm->GetZasInt(); <<
253 G4double energy = aDynPart->GetTotalEnergy() <<
254 G4ThreeVector projectileMomentum = <<
255 fDirectModel->GetAngularDistribution()->Sa <<
256 fC <<
257 G4double phi = projectileMomentum.getPhi(); <<
258 <<
259 if(isScatProjToProj) <<
260 { // the adjoint primary is the scattered e <<
261 G4ThreeVector gammaMomentum = <<
262 (projectileTotalEnergy - adjointPrimTota <<
263 G4ThreeVector(0., 0., 1.); <<
264 G4ThreeVector dirProd = projectileMomentum <<
265 G4double cost1 = std::cos(dirProd.a <<
266 G4double sint1 = std::sqrt(1. - cos <<
267 projectileMomentum = <<
268 G4ThreeVector(std::cos(phi) * sint1, std <<
269 projectileP; <<
270 } 253 }
271 << 254
272 projectileMomentum.rotateUz(theAdjointPrimar 255 projectileMomentum.rotateUz(theAdjointPrimary->GetMomentumDirection());
>> 256
>> 257
>> 258
>> 259 if (!IsScatProjToProjCase ){ //kill the primary and add a secondary
>> 260 fParticleChange->ProposeTrackStatus(fStopAndKill);
>> 261 fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum));
>> 262 }
>> 263 else {
>> 264 fParticleChange->ProposeEnergy(projectileKinEnergy);
>> 265 fParticleChange->ProposeMomentumDirection(projectileMomentum.unit());
>> 266
>> 267 }
>> 268 }
>> 269 ////////////////////////////////////////////////////////////////////////////////
>> 270 //
>> 271 G4AdjointBremsstrahlungModel::~G4AdjointBremsstrahlungModel()
>> 272 {;}
273 273
274 if(!isScatProjToProj) << 274 ////////////////////////////////////////////////////////////////////////////////
275 { // kill the primary and add a secondary << 275 //
276 fParticleChange->ProposeTrackStatus(fStopA << 276 G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecond(const G4Material* aMaterial,
277 fParticleChange->AddSecondary( << 277 G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction
278 new G4DynamicParticle(fAdjEquivDirectPri << 278 G4double kinEnergyProd // kinetic energy of the secondary particle
279 } << 279 )
280 else << 280 {/*if (UsePenelopeModel && !isPenelopeModelInitialised) {
281 { << 281 theEmModelManagerForFwdModels->Initialise(G4Electron::Electron(),G4Gamma::Gamma(),1.,0);
282 fParticleChange->ProposeEnergy(projectileK << 282 isPenelopeModelInitialised =true;
283 fParticleChange->ProposeMomentumDirection( << 283 }
284 } << 284 */
285 } << 285 return DiffCrossSectionPerVolumePrimToSecondApproximated2(aMaterial,
>> 286 kinEnergyProj,
>> 287 kinEnergyProd);
>> 288 /*return G4VEmAdjointModel::DiffCrossSectionPerVolumePrimToSecond(aMaterial,
>> 289 kinEnergyProj,
>> 290 kinEnergyProd);*/
>> 291 }
286 292
287 ////////////////////////////////////////////// 293 ////////////////////////////////////////////////////////////////////////////////
288 G4double G4AdjointBremsstrahlungModel::DiffCro << 294 //
289 const G4Material* aMaterial, << 295 G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecondApproximated1(
290 G4double kinEnergyProj, // kin energy of pr << 296 const G4Material* aMaterial,
291 G4double kinEnergyProd // kinetic energy o << 297 G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction
292 ) << 298 G4double kinEnergyProd // kinetic energy of the secondary particle
>> 299 )
293 { 300 {
294 if(!fIsDirectModelInitialised) << 301 G4double dCrossEprod=0.;
295 { << 302 G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(kinEnergyProd);
296 fEmModelManagerForFwdModels->Initialise(fE << 303 G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(kinEnergyProd);
297 fIsDirectModelInitialised = true; << 304
298 } << 305
299 return G4VEmAdjointModel::DiffCrossSectionPe << 306 //In this approximation we consider that the secondary gammas are sampled with 1/Egamma energy distribution
300 aMaterial, kinEnergyProj, kinEnergyProd); << 307 //This is what is applied in the discrete standard model before the rejection test that make a cooerction
>> 308 //The application of the same rejection function is not possble here.
>> 309 //The differentiation of the CS over Ecut does not produce neither a good differential CS. That is due to the
>> 310 // fact that in the discrete model the differential CS and the integrated CS are both fitted but separatly and
>> 311 // therefore do not allow a correct numerical differentiation of the integrated CS to get the differential one.
>> 312 // In the future we plan to use the brem secondary spectra from the G4Penelope implementation
>> 313
>> 314 if (kinEnergyProj>Emin_proj && kinEnergyProj<=Emax_proj){
>> 315 G4double sigma=theDirectEMModel->CrossSectionPerVolume(aMaterial,theDirectPrimaryPartDef,kinEnergyProj,1.*keV);
>> 316 dCrossEprod=sigma/kinEnergyProd/std::log(kinEnergyProj/keV);
>> 317 }
>> 318 return dCrossEprod;
>> 319
301 } 320 }
302 321
303 ////////////////////////////////////////////// 322 ////////////////////////////////////////////////////////////////////////////////
304 G4double G4AdjointBremsstrahlungModel::Adjoint << 323 //
305 const G4MaterialCutsCouple* aCouple, G4doubl << 324 G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecondApproximated2(
306 G4bool isScatProjToProj) << 325 const G4Material* material,
>> 326 G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction
>> 327 G4double kinEnergyProd // kinetic energy of the secondary particle
>> 328 )
307 { 329 {
308 static constexpr G4double maxEnergy = 100. * << 330 //In this approximation we derive the direct cross section over Tcut=gamma energy, en after apply the Migdla correction factor
309 // 2.78.. == std::exp(1.) << 331 //used in the direct model
310 if(!fIsDirectModelInitialised) << 332
311 { << 333 G4double dCrossEprod=0.;
312 fEmModelManagerForFwdModels->Initialise(fE << 334
313 fIsDirectModelInitialised = true; << 335 const G4ElementVector* theElementVector = material->GetElementVector();
>> 336 const double* theAtomNumDensityVector = material->GetAtomicNumDensityVector();
>> 337 G4double dum=0.;
>> 338 G4double E1=kinEnergyProd,E2=kinEnergyProd*1.001;
>> 339 G4double dE=E2-E1;
>> 340 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
>> 341 G4double C1=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,(*theElementVector)[i]->GetZ(),dum ,E1);
>> 342 G4double C2=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,(*theElementVector)[i]->GetZ(),dum,E2);
>> 343 dCrossEprod += theAtomNumDensityVector[i] * (C1-C2)/dE;
>> 344
>> 345 }
>> 346
>> 347 //Now the Migdal correction
>> 348
>> 349 G4double totalEnergy = kinEnergyProj+electron_mass_c2 ;
>> 350 G4double kp2 = MigdalConstant*totalEnergy*totalEnergy
>> 351 *(material->GetElectronDensity());
>> 352
>> 353
>> 354 G4double MigdalFactor = 1./(1.+kp2/(kinEnergyProd*kinEnergyProd)); // its seems that the factor used in the CS compuation i the direct
>> 355 //model is different than the one used in the secondary sampling by a
>> 356 //factor (1.+kp2) To be checked!
>> 357
>> 358 dCrossEprod*=MigdalFactor;
>> 359 return dCrossEprod;
>> 360
>> 361 }
>> 362 ////////////////////////////////////////////////////////////////////////////////
>> 363 //
>> 364 G4double G4AdjointBremsstrahlungModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
>> 365 G4double primEnergy,
>> 366 G4bool IsScatProjToProjCase)
>> 367 {/* if (UsePenelopeModel && !isPenelopeModelInitialised) {
>> 368 theEmModelManagerForFwdModels->Initialise(G4Electron::Electron(),G4Gamma::Gamma(),1.,0);
>> 369 isPenelopeModelInitialised =true;
314 } 370 }
315 if(fUseMatrix) << 371 */
316 return G4VEmAdjointModel::AdjointCrossSect << 372 if (UseMatrix) return G4VEmAdjointModel::AdjointCrossSection(aCouple,primEnergy,IsScatProjToProjCase);
317 <<
318 DefineCurrentMaterial(aCouple); 373 DefineCurrentMaterial(aCouple);
319 G4double Cross = 0.; << 374 G4double Cross=0.;
320 // this gives the constant above << 375 lastCZ=theDirectEMModel->CrossSectionPerVolume(aCouple->GetMaterial(),theDirectPrimaryPartDef,100.*MeV,100.*MeV/std::exp(1.));//this give the constant above
321 fLastCZ = fDirectModel->CrossSectionPerVolum << 376
322 aCouple->GetMaterial(), fDirectPrimaryPart << 377 if (!IsScatProjToProjCase ){
323 << 378 G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(primEnergy);
324 if(!isScatProjToProj) << 379 G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(primEnergy);
325 { << 380 if (Emax_proj>Emin_proj && primEnergy > currentTcutForDirectSecond) Cross= lastCZ*std::log(Emax_proj/Emin_proj);
326 G4double Emax_proj = GetSecondAdjEnergyMax << 381 }
327 G4double Emin_proj = GetSecondAdjEnergyMin << 382 else {
328 if(Emax_proj > Emin_proj && primEnergy > f << 383 G4double Emax_proj = GetSecondAdjEnergyMaxForScatProjToProjCase(primEnergy);
329 Cross = fCsBiasingFactor * fLastCZ * std << 384 G4double Emin_proj = GetSecondAdjEnergyMinForScatProjToProjCase(primEnergy,currentTcutForDirectSecond);
>> 385 if (Emax_proj>Emin_proj) Cross= lastCZ*std::log((Emax_proj-primEnergy)*Emin_proj/Emax_proj/(Emin_proj-primEnergy));
>> 386
330 } 387 }
331 else << 388 return Cross;
332 { << 389 }
333 G4double Emax_proj = GetSecondAdjEnergyMax << 390
334 G4double Emin_proj = << 391
335 GetSecondAdjEnergyMinForScatProjToProj(p << 392
336 if(Emax_proj > Emin_proj) << 393
337 Cross = fLastCZ * std::log((Emax_proj - << 394
338 Emax_proj / ( <<
339 } <<
340 return Cross; <<
341 } <<
342 395