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25 // 25 //
>> 26 // $Id: G4PAIModel.cc 83400 2014-08-21 14:48:50Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class 30 // GEANT4 Class
30 // File name: G4PAIModel.cc 31 // File name: G4PAIModel.cc
31 // 32 //
32 // Author: Vladimir.Grichine@cern.ch on base o 33 // Author: Vladimir.Grichine@cern.ch on base of V.Ivanchenko model interface
33 // 34 //
34 // Creation date: 05.10.2003 35 // Creation date: 05.10.2003
35 // 36 //
36 // Modifications: 37 // Modifications:
37 // 38 //
38 // 17.08.04 V.Grichine, bug fixed for Tkin<=0 39 // 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary
39 // 16.08.04 V.Grichine, bug fixed in massRatio 40 // 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection,
40 // SampleSecondary 41 // SampleSecondary
41 // 08.04.05 Major optimisation of internal int 42 // 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko)
42 // 26.07.09 Fixed logic to work with several m 43 // 26.07.09 Fixed logic to work with several materials (V.Ivantchenko)
43 // 21.11.10 V. Grichine verbose flag for proto 44 // 21.11.10 V. Grichine verbose flag for protons and G4PAYySection to
44 // check sandia table 45 // check sandia table
45 // 12.06.13 V. Grichine Bug fixed in SampleSec 46 // 12.06.13 V. Grichine Bug fixed in SampleSecondaries for scaled Tkin
46 // (fMass -> proton_mass_c2) 47 // (fMass -> proton_mass_c2)
47 // 19.08.13 V.Ivanchenko extract data handling 48 // 19.08.13 V.Ivanchenko extract data handling to G4PAIModelData class
48 // added sharing of internal data bet 49 // added sharing of internal data between threads (MT migration)
49 // 50 //
50 51
51 #include "G4PAIModel.hh" 52 #include "G4PAIModel.hh"
52 53
53 #include "G4SystemOfUnits.hh" 54 #include "G4SystemOfUnits.hh"
54 #include "G4PhysicalConstants.hh" 55 #include "G4PhysicalConstants.hh"
55 #include "G4Region.hh" 56 #include "G4Region.hh"
>> 57 #include "G4PhysicsLogVector.hh"
>> 58 #include "G4PhysicsFreeVector.hh"
>> 59 #include "G4PhysicsTable.hh"
>> 60 #include "G4ProductionCutsTable.hh"
56 #include "G4MaterialCutsCouple.hh" 61 #include "G4MaterialCutsCouple.hh"
57 #include "G4MaterialTable.hh" 62 #include "G4MaterialTable.hh"
58 #include "G4RegionStore.hh" << 63 #include "G4SandiaTable.hh"
>> 64 #include "G4OrderedTable.hh"
59 65
60 #include "Randomize.hh" 66 #include "Randomize.hh"
61 #include "G4Electron.hh" 67 #include "G4Electron.hh"
62 #include "G4Positron.hh" 68 #include "G4Positron.hh"
63 #include "G4Poisson.hh" 69 #include "G4Poisson.hh"
64 #include "G4Step.hh" 70 #include "G4Step.hh"
65 #include "G4Material.hh" 71 #include "G4Material.hh"
66 #include "G4DynamicParticle.hh" 72 #include "G4DynamicParticle.hh"
67 #include "G4ParticleDefinition.hh" 73 #include "G4ParticleDefinition.hh"
68 #include "G4ParticleChangeForLoss.hh" 74 #include "G4ParticleChangeForLoss.hh"
69 #include "G4PAIModelData.hh" 75 #include "G4PAIModelData.hh"
70 #include "G4DeltaAngle.hh" 76 #include "G4DeltaAngle.hh"
71 77
72 ////////////////////////////////////////////// 78 ////////////////////////////////////////////////////////////////////////
73 79
74 using namespace std; 80 using namespace std;
75 81
76 G4PAIModel::G4PAIModel(const G4ParticleDefinit 82 G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam)
77 : G4VEmModel(nam),G4VEmFluctuationModel(nam) 83 : G4VEmModel(nam),G4VEmFluctuationModel(nam),
78 fVerbose(0), 84 fVerbose(0),
79 fModelData(nullptr), << 85 fModelData(0),
80 fParticle(nullptr) << 86 fParticle(0)
81 { 87 {
82 fElectron = G4Electron::Electron(); 88 fElectron = G4Electron::Electron();
83 fPositron = G4Positron::Positron(); 89 fPositron = G4Positron::Positron();
84 90
85 fParticleChange = nullptr; << 91 fParticleChange = 0;
86 92
87 if(p) { SetParticle(p); } 93 if(p) { SetParticle(p); }
88 else { SetParticle(fElectron); } 94 else { SetParticle(fElectron); }
89 95
90 // default generator 96 // default generator
91 SetAngularDistribution(new G4DeltaAngle()); 97 SetAngularDistribution(new G4DeltaAngle());
92 fLowestTcut = 12.5*CLHEP::eV; << 98
>> 99 isInitialised = false;
93 } 100 }
94 101
95 ////////////////////////////////////////////// 102 ////////////////////////////////////////////////////////////////////////////
96 103
97 G4PAIModel::~G4PAIModel() 104 G4PAIModel::~G4PAIModel()
98 { 105 {
99 if(IsMaster()) { delete fModelData; } 106 if(IsMaster()) { delete fModelData; }
100 } 107 }
101 108
102 ////////////////////////////////////////////// 109 ////////////////////////////////////////////////////////////////////////////
103 110
104 void G4PAIModel::Initialise(const G4ParticleDe 111 void G4PAIModel::Initialise(const G4ParticleDefinition* p,
105 const G4DataVector& cuts) 112 const G4DataVector& cuts)
106 { 113 {
107 if(fVerbose > 1) { << 114 if(fVerbose > 0) {
108 G4cout<<"G4PAIModel::Initialise for "<<p-> 115 G4cout<<"G4PAIModel::Initialise for "<<p->GetParticleName()<<G4endl;
109 } 116 }
>> 117
>> 118 if(isInitialised) { return; }
>> 119 isInitialised = true;
>> 120
110 SetParticle(p); 121 SetParticle(p);
111 fParticleChange = GetParticleChangeForLoss() 122 fParticleChange = GetParticleChangeForLoss();
112 123
113 if(IsMaster()) { 124 if(IsMaster()) {
114 125
115 delete fModelData; << 126 InitialiseElementSelectors(p, cuts);
116 fMaterialCutsCoupleVector.clear(); << 127
117 if(fVerbose > 1) { << 128 if(!fModelData) {
118 G4cout << "G4PAIModel instantiates data <<
119 << G4endl; <<
120 } <<
121 G4double tmin = LowEnergyLimit()*fRatio; <<
122 G4double tmax = HighEnergyLimit()*fRatio; <<
123 fModelData = new G4PAIModelData(tmin, tmax <<
124 <<
125 // Prepare initialization <<
126 const G4MaterialTable* theMaterialTable = <<
127 std::size_t numOfMat = G4Material::GetNu <<
128 std::size_t numRegions = fPAIRegionVector. <<
129 129
130 // protect for unit tests << 130 G4double tmin = LowEnergyLimit()*fRatio;
131 if(0 == numRegions) { << 131 G4double tmax = HighEnergyLimit()*fRatio;
132 G4Exception("G4PAIModel::Initialise()"," << 132 fModelData = new G4PAIModelData(tmin, tmax, fVerbose);
133 "no G4Regions are registered <<
134 fPAIRegionVector.push_back(G4RegionStore <<
135 ->GetRegion("DefaultRegionForTheWorld <<
136 numRegions = 1; <<
137 } 133 }
>> 134 // Prepare initialization
>> 135 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
>> 136 size_t numOfMat = G4Material::GetNumberOfMaterials();
>> 137 size_t numRegions = fPAIRegionVector.size();
138 138
139 if(fVerbose > 1) { << 139 if(fVerbose > 0) {
140 G4cout << "G4PAIModel is defined for " < 140 G4cout << "G4PAIModel is defined for " << numRegions << " regions "
141 << "; number of materials " << numOfMat << 141 << G4endl;
>> 142 G4cout << " total number of materials " << numOfMat << G4endl;
142 } 143 }
143 for(std::size_t iReg = 0; iReg<numRegions; << 144 for(size_t iReg = 0; iReg<numRegions; ++iReg) {
144 const G4Region* curReg = fPAIRegionVecto 145 const G4Region* curReg = fPAIRegionVector[iReg];
145 G4Region* reg = const_cast<G4Region*>(cu 146 G4Region* reg = const_cast<G4Region*>(curReg);
146 147
147 for(std::size_t jMat = 0; jMat<numOfMat; << 148 for(size_t jMat = 0; jMat<numOfMat; ++jMat) {
148 G4Material* mat = (*theMaterialTable)[jMat]; 149 G4Material* mat = (*theMaterialTable)[jMat];
149 const G4MaterialCutsCouple* cutCouple = reg- 150 const G4MaterialCutsCouple* cutCouple = reg->FindCouple(mat);
150 std::size_t n = fMaterialCutsCoupleVector.si << 151 size_t n = fMaterialCutsCoupleVector.size();
151 if(nullptr != cutCouple) { << 152 /*
152 if(fVerbose > 1) { << 153 G4cout << "Region: " << reg->GetName() << " " << reg
>> 154 << " Couple " << cutCouple
>> 155 << " PAI defined for " << n << " couples"
>> 156 << " jMat= " << jMat << " " << mat->GetName()
>> 157 << G4endl;
>> 158 */
>> 159 if(cutCouple) {
>> 160 if(fVerbose > 0) {
153 G4cout << "Region <" << curReg->GetName( 161 G4cout << "Region <" << curReg->GetName() << "> mat <"
154 << mat->GetName() << "> CoupleIndex= " 162 << mat->GetName() << "> CoupleIndex= "
155 << cutCouple->GetIndex() 163 << cutCouple->GetIndex()
156 << " " << p->GetParticleName() 164 << " " << p->GetParticleName()
157 << " cutsize= " << cuts.size() << G4end 165 << " cutsize= " << cuts.size() << G4endl;
158 } 166 }
159 // check if this couple is not already ini 167 // check if this couple is not already initialized
160 G4bool isnew = true; 168 G4bool isnew = true;
161 if(0 < n) { 169 if(0 < n) {
162 for(std::size_t i=0; i<n; ++i) { << 170 for(size_t i=0; i<n; ++i) {
163 G4cout << i << G4endl; <<
164 if(cutCouple == fMaterialCutsCoupleVec 171 if(cutCouple == fMaterialCutsCoupleVector[i]) {
165 isnew = false; 172 isnew = false;
166 break; 173 break;
167 } 174 }
168 } 175 }
169 } 176 }
170 // initialise data banks 177 // initialise data banks
171 // G4cout << " isNew: " << isnew << " " << 178 //G4cout << " isNew: " << isnew << " " << cutCouple << G4endl;
172 if(isnew) { 179 if(isnew) {
173 fMaterialCutsCoupleVector.push_back(cutC 180 fMaterialCutsCoupleVector.push_back(cutCouple);
174 fModelData->Initialise(cutCouple, this); << 181 G4double deltaCutInKinEnergy = cuts[cutCouple->GetIndex()];
>> 182 fModelData->Initialise(cutCouple, deltaCutInKinEnergy, this);
175 } 183 }
176 } 184 }
177 } 185 }
178 } 186 }
179 InitialiseElementSelectors(p, cuts); <<
180 } 187 }
181 } 188 }
182 189
183 ////////////////////////////////////////////// 190 /////////////////////////////////////////////////////////////////////////
184 191
185 void G4PAIModel::InitialiseLocal(const G4Parti << 192 void G4PAIModel::InitialiseLocal(const G4ParticleDefinition*,
186 G4VEmModel* masterModel) 193 G4VEmModel* masterModel)
187 { 194 {
188 fModelData = static_cast<G4PAIModel*>(master 195 fModelData = static_cast<G4PAIModel*>(masterModel)->GetPAIModelData();
189 fMaterialCutsCoupleVector = <<
190 static_cast<G4PAIModel*>(masterModel)->Get <<
191 SetElementSelectors(masterModel->GetElementS 196 SetElementSelectors(masterModel->GetElementSelectors());
192 } 197 }
193 198
194 ////////////////////////////////////////////// 199 //////////////////////////////////////////////////////////////////////////////
195 200
196 G4double G4PAIModel::MinEnergyCut(const G4Part <<
197 const G4MaterialCutsCouple*) <<
198 { <<
199 return fLowestTcut; <<
200 } <<
201 <<
202 ////////////////////////////////////////////// <<
203 <<
204 G4double G4PAIModel::ComputeDEDXPerVolume(cons 201 G4double G4PAIModel::ComputeDEDXPerVolume(const G4Material*,
205 const G4ParticleDefinition* p, 202 const G4ParticleDefinition* p,
206 G4double kineticEnergy, 203 G4double kineticEnergy,
207 G4double cutEnergy) 204 G4double cutEnergy)
208 { << 205 {
>> 206 /*
>> 207 G4cout << "===1=== " << CurrentCouple()
>> 208 << " idx= " << CurrentCouple()->GetIndex()
>> 209 << " " << fMaterialCutsCoupleVector[0]
>> 210 << G4endl;
>> 211 */
209 G4int coupleIndex = FindCoupleIndex(CurrentC 212 G4int coupleIndex = FindCoupleIndex(CurrentCouple());
>> 213 //G4cout << "===2=== " << coupleIndex << G4endl;
210 if(0 > coupleIndex) { return 0.0; } 214 if(0 > coupleIndex) { return 0.0; }
211 215
212 G4double cut = std::min(MaxSecondaryEnergy(p 216 G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
>> 217
213 G4double scaledTkin = kineticEnergy*fRatio; 218 G4double scaledTkin = kineticEnergy*fRatio;
214 G4double dedx = fChargeSquare*fModelData->DE << 219
215 return dedx; << 220 return fChargeSquare*fModelData->DEDXPerVolume(coupleIndex, scaledTkin, cut);
216 } 221 }
217 222
218 ////////////////////////////////////////////// 223 /////////////////////////////////////////////////////////////////////////
219 224
220 G4double G4PAIModel::CrossSectionPerVolume( co 225 G4double G4PAIModel::CrossSectionPerVolume( const G4Material*,
221 const G4ParticleDefinition* p, 226 const G4ParticleDefinition* p,
222 G4double kineticEnergy, 227 G4double kineticEnergy,
223 G4double cutEnergy, 228 G4double cutEnergy,
224 G4double maxEnergy ) 229 G4double maxEnergy )
225 { 230 {
226 G4int coupleIndex = FindCoupleIndex(CurrentC 231 G4int coupleIndex = FindCoupleIndex(CurrentCouple());
227 if(0 > coupleIndex) { return 0.0; } 232 if(0 > coupleIndex) { return 0.0; }
228 233
229 G4double tmax = std::min(MaxSecondaryEnergy( 234 G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
230 if(tmax <= cutEnergy) { return 0.0; } 235 if(tmax <= cutEnergy) { return 0.0; }
231 236
232 G4double scaledTkin = kineticEnergy*fRatio; 237 G4double scaledTkin = kineticEnergy*fRatio;
233 G4double xs = fChargeSquare*fModelData->Cros << 238
234 scal << 239 return fChargeSquare*fModelData->CrossSectionPerVolume(coupleIndex,
235 return xs; << 240 scaledTkin,
>> 241 cutEnergy, tmax);
236 } 242 }
237 243
238 ////////////////////////////////////////////// 244 ///////////////////////////////////////////////////////////////////////////
239 // 245 //
240 // It is analog of PostStepDoIt in terms of se 246 // It is analog of PostStepDoIt in terms of secondary electron.
241 // 247 //
242 248
243 void G4PAIModel::SampleSecondaries(std::vector 249 void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
244 const G4MaterialCutsCouple* matCC, 250 const G4MaterialCutsCouple* matCC,
245 const G4DynamicParticle* dp, 251 const G4DynamicParticle* dp,
246 G4double tmin, 252 G4double tmin,
247 G4double maxEnergy) 253 G4double maxEnergy)
248 { 254 {
249 G4int coupleIndex = FindCoupleIndex(matCC); 255 G4int coupleIndex = FindCoupleIndex(matCC);
250 <<
251 //G4cout << "G4PAIModel::SampleSecondaries: <<
252 if(0 > coupleIndex) { return; } 256 if(0 > coupleIndex) { return; }
253 257
254 SetParticle(dp->GetDefinition()); 258 SetParticle(dp->GetDefinition());
255 G4double kineticEnergy = dp->GetKineticEnerg 259 G4double kineticEnergy = dp->GetKineticEnergy();
256 260
257 G4double tmax = MaxSecondaryEnergy(fParticle 261 G4double tmax = MaxSecondaryEnergy(fParticle, kineticEnergy);
258 if(maxEnergy < tmax) { tmax = maxEnergy; } 262 if(maxEnergy < tmax) { tmax = maxEnergy; }
259 if(tmin >= tmax) { return; } 263 if(tmin >= tmax) { return; }
260 264
261 G4ThreeVector direction= dp->GetMomentumDire 265 G4ThreeVector direction= dp->GetMomentumDirection();
262 G4double scaledTkin = kineticEnergy*fRati 266 G4double scaledTkin = kineticEnergy*fRatio;
263 G4double totalEnergy = kineticEnergy + fMa 267 G4double totalEnergy = kineticEnergy + fMass;
264 G4double totalMomentum = sqrt(kineticEnergy* 268 G4double totalMomentum = sqrt(kineticEnergy*(totalEnergy+fMass));
265 269
266 G4double deltaTkin = 270 G4double deltaTkin =
267 fModelData->SamplePostStepTransfer(coupleI << 271 fModelData->SamplePostStepTransfer(coupleIndex, scaledTkin, tmax);
268 272
269 //G4cout<<"G4PAIModel::SampleSecondaries; de 273 //G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV
270 // <<" keV "<< " Escaled(MeV)= " << scaledT 274 // <<" keV "<< " Escaled(MeV)= " << scaledTkin << G4endl;
271 275
272 if( !(deltaTkin <= 0.) && !(deltaTkin > 0)) 276 if( !(deltaTkin <= 0.) && !(deltaTkin > 0)) {
273 G4cout<<"G4PAIModel::SampleSecondaries; de 277 G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV
274 <<" keV "<< " Escaled(MeV)= " << scaledTki 278 <<" keV "<< " Escaled(MeV)= " << scaledTkin << G4endl;
275 return; 279 return;
276 } 280 }
277 if( deltaTkin <= 0.) { return; } 281 if( deltaTkin <= 0.) { return; }
278 282
279 if( deltaTkin > tmax) { deltaTkin = tmax; } 283 if( deltaTkin > tmax) { deltaTkin = tmax; }
280 284
281 const G4Element* anElement = SelectTargetAto << 285 const G4Element* anElement = SelectRandomAtom(matCC,fParticle,kineticEnergy);
282 << 286 G4int Z = G4lrint(anElement->GetZ());
283 <<
284 G4int Z = anElement->GetZasInt(); <<
285 287
286 auto deltaRay = new G4DynamicParticle(fElect << 288 G4DynamicParticle* deltaRay = new G4DynamicParticle(fElectron,
287 GetAngularDistribution()->SampleDirectio 289 GetAngularDistribution()->SampleDirection(dp, deltaTkin,
288 Z, matCC->GetMaterial()), 290 Z, matCC->GetMaterial()),
289 deltaTkin); 291 deltaTkin);
290 292
291 // primary change 293 // primary change
292 kineticEnergy -= deltaTkin; 294 kineticEnergy -= deltaTkin;
293 G4ThreeVector dir = totalMomentum*direction 295 G4ThreeVector dir = totalMomentum*direction - deltaRay->GetMomentum();
294 direction = dir.unit(); 296 direction = dir.unit();
295 fParticleChange->SetProposedKineticEnergy(ki 297 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
296 fParticleChange->SetProposedMomentumDirectio 298 fParticleChange->SetProposedMomentumDirection(direction);
297 299
298 vdp->push_back(deltaRay); 300 vdp->push_back(deltaRay);
299 } 301 }
300 302
301 ////////////////////////////////////////////// 303 ///////////////////////////////////////////////////////////////////////
302 304
303 G4double G4PAIModel::SampleFluctuations(const << 305 G4double G4PAIModel::SampleFluctuations( const G4MaterialCutsCouple* matCC,
304 const << 306 const G4DynamicParticle* aParticle,
305 const << 307 G4double, G4double step,
306 const G4double, << 308 G4double eloss)
307 const <<
308 const G4double eloss) <<
309 { 309 {
310 G4int coupleIndex = FindCoupleIndex(matCC); 310 G4int coupleIndex = FindCoupleIndex(matCC);
311 if(0 > coupleIndex) { return eloss; } 311 if(0 > coupleIndex) { return eloss; }
312 312
313 SetParticle(aParticle->GetDefinition()); 313 SetParticle(aParticle->GetDefinition());
314 314
315 /* 315 /*
316 G4cout << "G4PAIModel::SampleFluctuations st 316 G4cout << "G4PAIModel::SampleFluctuations step(mm)= "<< step/mm
317 << " Eloss(keV)= " << eloss/keV << " in " 317 << " Eloss(keV)= " << eloss/keV << " in "
318 << matCC->Getmaterial()->GetName() << G4end 318 << matCC->Getmaterial()->GetName() << G4endl;
319 */ 319 */
320 320
321 G4double Tkin = aParticle->GetKineticE 321 G4double Tkin = aParticle->GetKineticEnergy();
322 G4double scaledTkin = Tkin*fRatio; 322 G4double scaledTkin = Tkin*fRatio;
323 323
324 G4double loss = fModelData->SampleAlongStepT 324 G4double loss = fModelData->SampleAlongStepTransfer(coupleIndex, Tkin,
325 scaledTkin, tcut, << 325 scaledTkin,
326 step*fChargeSquare); 326 step*fChargeSquare);
327 327
328 // G4cout<<"PAIModel AlongStepLoss = "<<loss 328 // G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = "
329 //<<step/mm<<" mm"<<G4endl; 329 //<<step/mm<<" mm"<<G4endl;
330 return loss; 330 return loss;
331 331
332 } 332 }
333 333
334 ////////////////////////////////////////////// 334 //////////////////////////////////////////////////////////////////////
335 // 335 //
336 // Returns the statistical estimation of the e 336 // Returns the statistical estimation of the energy loss distribution variance
337 // 337 //
338 338
339 339
340 G4double G4PAIModel::Dispersion( const G4Mater 340 G4double G4PAIModel::Dispersion( const G4Material* material,
341 const G4Dynam 341 const G4DynamicParticle* aParticle,
342 const G4double tcut, << 342 G4double tmax,
343 const G4double tmax, << 343 G4double step )
344 const G4double step ) <<
345 { 344 {
346 G4double particleMass = aParticle->GetMass( 345 G4double particleMass = aParticle->GetMass();
347 G4double electronDensity = material->GetElec 346 G4double electronDensity = material->GetElectronDensity();
348 G4double kineticEnergy = aParticle->GetKinet 347 G4double kineticEnergy = aParticle->GetKineticEnergy();
349 G4double q = aParticle->GetCharge()/eplus; 348 G4double q = aParticle->GetCharge()/eplus;
350 G4double etot = kineticEnergy + particleMass 349 G4double etot = kineticEnergy + particleMass;
351 G4double beta2 = kineticEnergy*(kineticEnerg 350 G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*particleMass)/(etot*etot);
352 G4double siga = (tmax/beta2 - 0.5*tcut) * t << 351 G4double siga = (1.0/beta2 - 0.5) * twopi_mc2_rcl2 * tmax * step
353 * electronDensity * q * q; 352 * electronDensity * q * q;
354 353
355 return siga; 354 return siga;
>> 355 /*
>> 356 G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.;
>> 357 for(G4int i = 0; i < fMeanNumber; i++)
>> 358 {
>> 359 loss = SampleFluctuations(material,aParticle,tmax,step,meanLoss);
>> 360 sumLoss += loss;
>> 361 sumLoss2 += loss*loss;
>> 362 }
>> 363 meanLoss = sumLoss/fMeanNumber;
>> 364 sigma2 = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber;
>> 365 return sigma2;
>> 366 */
356 } 367 }
357 368
358 ////////////////////////////////////////////// 369 /////////////////////////////////////////////////////////////////////
359 370
360 G4double G4PAIModel::MaxSecondaryEnergy( const 371 G4double G4PAIModel::MaxSecondaryEnergy( const G4ParticleDefinition* p,
361 G4double kinEnergy) 372 G4double kinEnergy)
362 { 373 {
363 SetParticle(p); 374 SetParticle(p);
364 G4double tmax = kinEnergy; 375 G4double tmax = kinEnergy;
365 if(p == fElectron) { tmax *= 0.5; } 376 if(p == fElectron) { tmax *= 0.5; }
366 else if(p != fPositron) { 377 else if(p != fPositron) {
367 G4double ratio= electron_mass_c2/fMass; 378 G4double ratio= electron_mass_c2/fMass;
368 G4double gamma= kinEnergy/fMass + 1.0; 379 G4double gamma= kinEnergy/fMass + 1.0;
369 tmax = 2.0*electron_mass_c2*(gamma*gamma - 380 tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
370 (1. + 2.0*gamma*ratio + rati 381 (1. + 2.0*gamma*ratio + ratio*ratio);
371 } 382 }
372 return tmax; 383 return tmax;
373 } 384 }
374 385
375 ////////////////////////////////////////////// 386 ///////////////////////////////////////////////////////////////
376 387
377 void G4PAIModel::DefineForRegion(const G4Regio 388 void G4PAIModel::DefineForRegion(const G4Region* r)
378 { 389 {
379 fPAIRegionVector.push_back(r); 390 fPAIRegionVector.push_back(r);
380 } 391 }
381 392
382 ////////////////////////////////////////////// << 393 //
383 << 394 //
>> 395 /////////////////////////////////////////////////
384 396