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26 << 26 // $Id: G4AdjointBremsstrahlungModel.cc,v 1.6 2010-11-11 11:51:56 ldesorgh Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
>> 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 theEmModelManagerForFwdModels = new G4EmModelManager();
>> 54 isDirectModelInitialised = false;
>> 55 G4VEmFluctuationModel* f=0;
>> 56 G4Region* r=0;
>> 57 theEmModelManagerForFwdModels->AddEmModel(1, theDirectStdBremModel, f, r);
>> 58 // theDirectPenelopeBremModel =0;
>> 59
65 SetApplyCutInRange(true); 60 SetApplyCutInRange(true);
>> 61 highKinEnergy= 100.*TeV;
>> 62 lowKinEnergy = 1.0*keV;
66 63
67 fElectron = G4Electron::Electron(); << 64 lastCZ =0.;
68 fGamma = G4Gamma::Gamma(); <<
69 65
70 fAdjEquivDirectPrimPart = G4AdjointElectro << 66
71 fAdjEquivDirectSecondPart = G4AdjointGamma:: << 67 theAdjEquivOfDirectPrimPartDef =G4AdjointElectron::AdjointElectron();
72 fDirectPrimaryPart = fElectron; << 68 theAdjEquivOfDirectSecondPartDef=G4AdjointGamma::AdjointGamma();
73 fSecondPartSameType = false; << 69 theDirectPrimaryPartDef=G4Electron::Electron();
>> 70 second_part_of_same_type=false;
>> 71
>> 72 /*UsePenelopeModel=false;
>> 73 if (UsePenelopeModel) {
>> 74 G4PenelopeBremsstrahlungModel* thePenelopeModel = new G4PenelopeBremsstrahlungModel(G4Electron::Electron(),"PenelopeBrem");
>> 75 theEmModelManagerForFwdModels = new G4EmModelManager();
>> 76 isPenelopeModelInitialised = false;
>> 77 G4VEmFluctuationModel* f=0;
>> 78 G4Region* r=0;
>> 79 theDirectEMModel=thePenelopeModel;
>> 80 theEmModelManagerForFwdModels->AddEmModel(1, thePenelopeModel, f, r);
>> 81 }
>> 82 */
>> 83
74 84
75 fCSManager = G4AdjointCSManager::GetAdjointC << 85
76 } 86 }
77 <<
78 ////////////////////////////////////////////// 87 ////////////////////////////////////////////////////////////////////////////////
>> 88 //
79 G4AdjointBremsstrahlungModel::~G4AdjointBremss 89 G4AdjointBremsstrahlungModel::~G4AdjointBremsstrahlungModel()
80 { << 90 {if (theDirectStdBremModel) delete theDirectStdBremModel;
81 if(fEmModelManagerForFwdModels) << 91 if (theEmModelManagerForFwdModels) delete theEmModelManagerForFwdModels;
82 delete fEmModelManagerForFwdModels; <<
83 } 92 }
84 93
85 ////////////////////////////////////////////// 94 ////////////////////////////////////////////////////////////////////////////////
86 void G4AdjointBremsstrahlungModel::SampleSecon << 95 //
87 const G4Track& aTrack, G4bool isScatProjToPr << 96 void G4AdjointBremsstrahlungModel::SampleSecondaries(const G4Track& aTrack,
88 G4ParticleChange* fParticleChange) << 97 G4bool IsScatProjToProjCase,
>> 98 G4ParticleChange* fParticleChange)
89 { 99 {
90 if(!fUseMatrix) << 100 if (!UseMatrix) return RapidSampleSecondaries(aTrack,IsScatProjToProjCase,fParticleChange);
91 return RapidSampleSecondaries(aTrack, isSc <<
92 <<
93 const G4DynamicParticle* theAdjointPrimary = <<
94 DefineCurrentMaterial(aTrack.GetMaterialCuts <<
95 <<
96 G4double adjointPrimKinEnergy = theAdjoint <<
97 G4double adjointPrimTotalEnergy = theAdjoint <<
98 101
99 if(adjointPrimKinEnergy > GetHighEnergyLimit << 102 const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle();
100 { << 103 DefineCurrentMaterial(aTrack.GetMaterialCutsCouple());
101 return; << 104
102 } << 105
>> 106 G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy();
>> 107 G4double adjointPrimTotalEnergy = theAdjointPrimary->GetTotalEnergy();
>> 108
>> 109 if (adjointPrimKinEnergy>HighEnergyLimit*0.999){
>> 110 return;
>> 111 }
>> 112
>> 113 G4double projectileKinEnergy = SampleAdjSecEnergyFromCSMatrix(adjointPrimKinEnergy,
>> 114 IsScatProjToProjCase);
>> 115 //Weight correction
>> 116 //-----------------------
>> 117 CorrectPostStepWeight(fParticleChange,
>> 118 aTrack.GetWeight(),
>> 119 adjointPrimKinEnergy,
>> 120 projectileKinEnergy,
>> 121 IsScatProjToProjCase);
>> 122
>> 123
>> 124 //Kinematic
>> 125 //---------
>> 126 G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
>> 127 G4double projectileTotalEnergy = projectileM0+projectileKinEnergy;
>> 128 G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0;
>> 129 G4double projectileP = std::sqrt(projectileP2);
>> 130
>> 131
>> 132 //Angle of the gamma direction with the projectile taken from G4eBremsstrahlungModel
>> 133 //------------------------------------------------
>> 134 G4double u;
>> 135 const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ;
103 136
104 G4double projectileKinEnergy = << 137 if (9./(9.+d) > G4UniformRand()) u = - std::log(G4UniformRand()*G4UniformRand())/a1;
105 SampleAdjSecEnergyFromCSMatrix(adjointPrim << 138 else u = - std::log(G4UniformRand()*G4UniformRand())/a2;
106 139
107 // Weight correction << 140 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 <<
118 141
119 // Angle of the gamma direction with the pro << 142 G4double sint = std::sin(theta);
120 // G4eBremsstrahlungModel << 143 G4double cost = std::cos(theta);
121 G4double u; << 144
122 if(0.25 > G4UniformRand()) << 145 G4double phi = twopi * G4UniformRand() ;
123 u = -std::log(G4UniformRand() * G4UniformR << 146
124 else << 147 G4ThreeVector projectileMomentum;
125 u = -std::log(G4UniformRand() * G4UniformR << 148 projectileMomentum=G4ThreeVector(std::cos(phi)*sint,std::sin(phi)*sint,cost)*projectileP; //gamma frame
126 << 149 if (IsScatProjToProjCase) {//the adjoint primary is the scattered e-
127 G4double theta = u * electron_mass_c2 / proj << 150 G4ThreeVector gammaMomentum = (projectileTotalEnergy-adjointPrimTotalEnergy)*G4ThreeVector(0.,0.,1.);
128 G4double sint = std::sin(theta); << 151 G4ThreeVector dirProd=projectileMomentum-gammaMomentum;
129 G4double cost = std::cos(theta); << 152 G4double cost1 = std::cos(dirProd.angle(projectileMomentum));
130 << 153 G4double sint1 = std::sqrt(1.-cost1*cost1);
131 G4double phi = twopi * G4UniformRand(); << 154 projectileMomentum=G4ThreeVector(std::cos(phi)*sint1,std::sin(phi)*sint1,cost1)*projectileP;
132 << 155
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 } 156 }
148 << 157
149 projectileMomentum.rotateUz(theAdjointPrimar 158 projectileMomentum.rotateUz(theAdjointPrimary->GetMomentumDirection());
150 << 159
151 if(!isScatProjToProj) << 160
152 { // kill the primary and add a secondary << 161
153 fParticleChange->ProposeTrackStatus(fStopA << 162 if (!IsScatProjToProjCase ){ //kill the primary and add a secondary
154 fParticleChange->AddSecondary( << 163 fParticleChange->ProposeTrackStatus(fStopAndKill);
155 new G4DynamicParticle(fAdjEquivDirectPri << 164 fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum));
156 } << 165 }
157 else << 166 else {
158 { << 167 fParticleChange->ProposeEnergy(projectileKinEnergy);
159 fParticleChange->ProposeEnergy(projectileK << 168 fParticleChange->ProposeMomentumDirection(projectileMomentum.unit());
160 fParticleChange->ProposeMomentumDirection( << 169
161 } << 170 }
162 } << 171 }
163 <<
164 ////////////////////////////////////////////// 172 ////////////////////////////////////////////////////////////////////////////////
165 void G4AdjointBremsstrahlungModel::RapidSample << 173 //
166 const G4Track& aTrack, G4bool isScatProjToPr << 174 void G4AdjointBremsstrahlungModel::RapidSampleSecondaries(const G4Track& aTrack,
167 G4ParticleChange* fParticleChange) << 175 G4bool IsScatProjToProjCase,
168 { << 176 G4ParticleChange* fParticleChange)
169 const G4DynamicParticle* theAdjointPrimary = << 177 {
170 DefineCurrentMaterial(aTrack.GetMaterialCuts << 178
171 << 179 const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle();
172 G4double adjointPrimKinEnergy = theAdjoint << 180 DefineCurrentMaterial(aTrack.GetMaterialCutsCouple());
173 G4double adjointPrimTotalEnergy = theAdjoint << 181
174 << 182
175 if(adjointPrimKinEnergy > GetHighEnergyLimit << 183 G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy();
176 { << 184 G4double adjointPrimTotalEnergy = theAdjointPrimary->GetTotalEnergy();
177 return; << 185
178 } << 186 if (adjointPrimKinEnergy>HighEnergyLimit*0.999){
>> 187 return;
>> 188 }
>> 189
>> 190 G4double projectileKinEnergy =0.;
>> 191 G4double gammaEnergy=0.;
>> 192 G4double diffCSUsed=0.;
>> 193 if (!IsScatProjToProjCase){
>> 194 gammaEnergy=adjointPrimKinEnergy;
>> 195 G4double Emax = GetSecondAdjEnergyMaxForProdToProjCase(adjointPrimKinEnergy);
>> 196 G4double Emin= GetSecondAdjEnergyMinForProdToProjCase(adjointPrimKinEnergy);;
>> 197 if (Emin>=Emax) return;
>> 198 projectileKinEnergy=Emin*std::pow(Emax/Emin,G4UniformRand());
>> 199 diffCSUsed=lastCZ/projectileKinEnergy;
>> 200
>> 201 }
>> 202 else { G4double Emax = GetSecondAdjEnergyMaxForScatProjToProjCase(adjointPrimKinEnergy);
>> 203 G4double Emin = GetSecondAdjEnergyMinForScatProjToProjCase(adjointPrimKinEnergy,currentTcutForDirectSecond);
>> 204 if (Emin>=Emax) return;
>> 205 G4double f1=(Emin-adjointPrimKinEnergy)/Emin;
>> 206 G4double f2=(Emax-adjointPrimKinEnergy)/Emax/f1;
>> 207 //G4cout<<"f1 and f2 "<<f1<<'\t'<<f2<<G4endl;
>> 208 projectileKinEnergy=adjointPrimKinEnergy/(1.-f1*std::pow(f2,G4UniformRand()));
>> 209 gammaEnergy=projectileKinEnergy-adjointPrimKinEnergy;
>> 210 diffCSUsed=lastCZ*adjointPrimKinEnergy/projectileKinEnergy/gammaEnergy;
>> 211
>> 212 }
>> 213
>> 214
>> 215
>> 216
>> 217 //Weight correction
>> 218 //-----------------------
>> 219 //First w_corr is set to the ratio between adjoint total CS and fwd total CS
>> 220 G4double w_corr=G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection();
>> 221
>> 222 //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
>> 223 //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.
>> 224 //Basically any other differential CS diffCS could be used here (example Penelope).
>> 225
>> 226 G4double diffCS = DiffCrossSectionPerVolumePrimToSecond(currentMaterial, projectileKinEnergy, gammaEnergy);
>> 227 w_corr*=diffCS/diffCSUsed;
>> 228
>> 229 G4double new_weight = aTrack.GetWeight()*w_corr;
>> 230 fParticleChange->SetParentWeightByProcess(false);
>> 231 fParticleChange->SetSecondaryWeightByProcess(false);
>> 232 fParticleChange->ProposeParentWeight(new_weight);
>> 233
>> 234 //Kinematic
>> 235 //---------
>> 236 G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass();
>> 237 G4double projectileTotalEnergy = projectileM0+projectileKinEnergy;
>> 238 G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0;
>> 239 G4double projectileP = std::sqrt(projectileP2);
>> 240
>> 241
>> 242 //Angle of the gamma direction with the projectile taken from G4eBremsstrahlungModel
>> 243 //------------------------------------------------
>> 244 G4double u;
>> 245 const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ;
179 246
180 G4double projectileKinEnergy = 0.; << 247 if (9./(9.+d) > G4UniformRand()) u = - std::log(G4UniformRand()*G4UniformRand())/a1;
181 G4double gammaEnergy = 0.; << 248 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 } <<
209 249
210 // Weight correction: << 250 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 } <<
221 251
222 // Then another correction is needed due to << 252 G4double sint = std::sin(theta);
223 // differential CS has been used rather than << 253 G4double cost = std::cos(theta);
224 // direct model Here we consider the true di << 254
225 // numerical differentiation over Tcut of th << 255 G4double phi = twopi * G4UniformRand() ;
226 // Migdal term. Basically any other differen << 256
227 // (example Penelope). << 257 G4ThreeVector projectileMomentum;
228 G4double diffCS = DiffCrossSectionPerVolumeP << 258 projectileMomentum=G4ThreeVector(std::cos(phi)*sint,std::sin(phi)*sint,cost)*projectileP; //gamma frame
229 fCurrentMaterial, projectileKinEnergy, gam << 259 if (IsScatProjToProjCase) {//the adjoint primary is the scattered e-
230 w_corr *= diffCS / diffCSUsed; << 260 G4ThreeVector gammaMomentum = (projectileTotalEnergy-adjointPrimTotalEnergy)*G4ThreeVector(0.,0.,1.);
231 << 261 G4ThreeVector dirProd=projectileMomentum-gammaMomentum;
232 G4double new_weight = aTrack.GetWeight() * w << 262 G4double cost1 = std::cos(dirProd.angle(projectileMomentum));
233 fParticleChange->SetParentWeightByProcess(fa << 263 G4double sint1 = std::sqrt(1.-cost1*cost1);
234 fParticleChange->SetSecondaryWeightByProcess << 264 projectileMomentum=G4ThreeVector(std::cos(phi)*sint1,std::sin(phi)*sint1,cost1)*projectileP;
235 fParticleChange->ProposeParentWeight(new_wei << 265
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 } 266 }
271 << 267
272 projectileMomentum.rotateUz(theAdjointPrimar 268 projectileMomentum.rotateUz(theAdjointPrimary->GetMomentumDirection());
273 << 269
274 if(!isScatProjToProj) << 270
275 { // kill the primary and add a secondary << 271
276 fParticleChange->ProposeTrackStatus(fStopA << 272 if (!IsScatProjToProjCase ){ //kill the primary and add a secondary
277 fParticleChange->AddSecondary( << 273 fParticleChange->ProposeTrackStatus(fStopAndKill);
278 new G4DynamicParticle(fAdjEquivDirectPri << 274 fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum));
279 } << 275 }
280 else << 276 else {
281 { << 277 fParticleChange->ProposeEnergy(projectileKinEnergy);
282 fParticleChange->ProposeEnergy(projectileK << 278 fParticleChange->ProposeMomentumDirection(projectileMomentum.unit());
283 fParticleChange->ProposeMomentumDirection( << 279
284 } << 280 }
285 } << 281 }
>> 282 ////////////////////////////////////////////////////////////////////////////////
>> 283 //
>> 284 G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecond(const G4Material* aMaterial,
>> 285 G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction
>> 286 G4double kinEnergyProd // kinetic energy of the secondary particle
>> 287 )
>> 288 {if (!isDirectModelInitialised) {
>> 289 theEmModelManagerForFwdModels->Initialise(G4Electron::Electron(),G4Gamma::Gamma(),1.,0);
>> 290 isDirectModelInitialised =true;
>> 291 }
>> 292
>> 293 return DiffCrossSectionPerVolumePrimToSecondApproximated2(aMaterial,
>> 294 kinEnergyProj,
>> 295 kinEnergyProd);
>> 296 /*return G4VEmAdjointModel::DiffCrossSectionPerVolumePrimToSecond(aMaterial,
>> 297 kinEnergyProj,
>> 298 kinEnergyProd);*/
>> 299 }
286 300
287 ////////////////////////////////////////////// 301 ////////////////////////////////////////////////////////////////////////////////
288 G4double G4AdjointBremsstrahlungModel::DiffCro << 302 //
289 const G4Material* aMaterial, << 303 G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecondApproximated1(
290 G4double kinEnergyProj, // kin energy of pr << 304 const G4Material* aMaterial,
291 G4double kinEnergyProd // kinetic energy o << 305 G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction
292 ) << 306 G4double kinEnergyProd // kinetic energy of the secondary particle
>> 307 )
293 { 308 {
294 if(!fIsDirectModelInitialised) << 309 G4double dCrossEprod=0.;
295 { << 310 G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(kinEnergyProd);
296 fEmModelManagerForFwdModels->Initialise(fE << 311 G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(kinEnergyProd);
297 fIsDirectModelInitialised = true; << 312
298 } << 313
299 return G4VEmAdjointModel::DiffCrossSectionPe << 314 //In this approximation we consider that the secondary gammas are sampled with 1/Egamma energy distribution
300 aMaterial, kinEnergyProj, kinEnergyProd); << 315 //This is what is applied in the discrete standard model before the rejection test that make a correction
>> 316 //The application of the same rejection function is not possible here.
>> 317 //The differentiation of the CS over Ecut does not produce neither a good differential CS. That is due to the
>> 318 // fact that in the discrete model the differential CS and the integrated CS are both fitted but separatly and
>> 319 // therefore do not allow a correct numerical differentiation of the integrated CS to get the differential one.
>> 320 // In the future we plan to use the brem secondary spectra from the G4Penelope implementation
>> 321
>> 322 if (kinEnergyProj>Emin_proj && kinEnergyProj<=Emax_proj){
>> 323 G4double sigma=theDirectEMModel->CrossSectionPerVolume(aMaterial,theDirectPrimaryPartDef,kinEnergyProj,1.*keV);
>> 324 dCrossEprod=sigma/kinEnergyProd/std::log(kinEnergyProj/keV);
>> 325 }
>> 326 return dCrossEprod;
>> 327
301 } 328 }
302 329
303 ////////////////////////////////////////////// 330 ////////////////////////////////////////////////////////////////////////////////
304 G4double G4AdjointBremsstrahlungModel::Adjoint << 331 //
305 const G4MaterialCutsCouple* aCouple, G4doubl << 332 G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecondApproximated2(
306 G4bool isScatProjToProj) << 333 const G4Material* material,
>> 334 G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction
>> 335 G4double kinEnergyProd // kinetic energy of the secondary particle
>> 336 )
307 { 337 {
308 static constexpr G4double maxEnergy = 100. * << 338 //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.) << 339 //used in the direct model
310 if(!fIsDirectModelInitialised) << 340
311 { << 341 G4double dCrossEprod=0.;
312 fEmModelManagerForFwdModels->Initialise(fE << 342
313 fIsDirectModelInitialised = true; << 343 const G4ElementVector* theElementVector = material->GetElementVector();
>> 344 const double* theAtomNumDensityVector = material->GetAtomicNumDensityVector();
>> 345 G4double dum=0.;
>> 346 G4double E1=kinEnergyProd,E2=kinEnergyProd*1.001;
>> 347 G4double dE=E2-E1;
>> 348 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
>> 349 G4double C1=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,(*theElementVector)[i]->GetZ(),dum ,E1);
>> 350 G4double C2=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,(*theElementVector)[i]->GetZ(),dum,E2);
>> 351 dCrossEprod += theAtomNumDensityVector[i] * (C1-C2)/dE;
>> 352
>> 353 }
>> 354
>> 355 //Now the Migdal correction
>> 356
>> 357 G4double totalEnergy = kinEnergyProj+electron_mass_c2 ;
>> 358 G4double kp2 = MigdalConstant*totalEnergy*totalEnergy
>> 359 *(material->GetElectronDensity());
>> 360
>> 361
>> 362 G4double MigdalFactor = 1./(1.+kp2/(kinEnergyProd*kinEnergyProd)); // its seems that the factor used in the CS compuation i the direct
>> 363 //model is different than the one used in the secondary sampling by a
>> 364 //factor (1.+kp2) To be checked!
>> 365
>> 366 dCrossEprod*=MigdalFactor;
>> 367 return dCrossEprod;
>> 368
>> 369 }
>> 370 ////////////////////////////////////////////////////////////////////////////////
>> 371 //
>> 372 G4double G4AdjointBremsstrahlungModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple,
>> 373 G4double primEnergy,
>> 374 G4bool IsScatProjToProjCase)
>> 375 { if (!isDirectModelInitialised) {
>> 376 theEmModelManagerForFwdModels->Initialise(G4Electron::Electron(),G4Gamma::Gamma(),1.,0);
>> 377 isDirectModelInitialised =true;
314 } 378 }
315 if(fUseMatrix) << 379 if (UseMatrix) return G4VEmAdjointModel::AdjointCrossSection(aCouple,primEnergy,IsScatProjToProjCase);
316 return G4VEmAdjointModel::AdjointCrossSect <<
317 <<
318 DefineCurrentMaterial(aCouple); 380 DefineCurrentMaterial(aCouple);
319 G4double Cross = 0.; << 381 G4double Cross=0.;
320 // this gives the constant above << 382 lastCZ=theDirectEMModel->CrossSectionPerVolume(aCouple->GetMaterial(),theDirectPrimaryPartDef,100.*MeV,100.*MeV/std::exp(1.));//this give the constant above
321 fLastCZ = fDirectModel->CrossSectionPerVolum << 383
322 aCouple->GetMaterial(), fDirectPrimaryPart << 384 if (!IsScatProjToProjCase ){
323 << 385 G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(primEnergy);
324 if(!isScatProjToProj) << 386 G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(primEnergy);
325 { << 387 if (Emax_proj>Emin_proj && primEnergy > currentTcutForDirectSecond) Cross= lastCZ*std::log(Emax_proj/Emin_proj);
326 G4double Emax_proj = GetSecondAdjEnergyMax << 388 }
327 G4double Emin_proj = GetSecondAdjEnergyMin << 389 else {
328 if(Emax_proj > Emin_proj && primEnergy > f << 390 G4double Emax_proj = GetSecondAdjEnergyMaxForScatProjToProjCase(primEnergy);
329 Cross = fCsBiasingFactor * fLastCZ * std << 391 G4double Emin_proj = GetSecondAdjEnergyMinForScatProjToProjCase(primEnergy,currentTcutForDirectSecond);
330 } << 392 if (Emax_proj>Emin_proj) Cross= lastCZ*std::log((Emax_proj-primEnergy)*Emin_proj/Emax_proj/(Emin_proj-primEnergy));
331 else << 393
332 { << 394 }
333 G4double Emax_proj = GetSecondAdjEnergyMax << 395 return Cross;
334 G4double Emin_proj = << 396 }
335 GetSecondAdjEnergyMinForScatProjToProj(p << 397
336 if(Emax_proj > Emin_proj) << 398 G4double G4AdjointBremsstrahlungModel::GetAdjointCrossSection(const G4MaterialCutsCouple* aCouple,
337 Cross = fLastCZ * std::log((Emax_proj - << 399 G4double primEnergy,
338 Emax_proj / ( << 400 G4bool IsScatProjToProjCase)
339 } << 401 {
340 return Cross; << 402 return AdjointCrossSection(aCouple, primEnergy,IsScatProjToProjCase);
>> 403 lastCZ=theDirectEMModel->CrossSectionPerVolume(aCouple->GetMaterial(),theDirectPrimaryPartDef,100.*MeV,100.*MeV/std::exp(1.));//this give the constant above
>> 404 return G4VEmAdjointModel::GetAdjointCrossSection(aCouple, primEnergy,IsScatProjToProjCase);
>> 405
341 } 406 }
>> 407
>> 408
>> 409
342 410