Geant4 Cross Reference

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Geant4/processes/electromagnetic/utils/src/G4VMultipleScattering.cc

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Diff markup

Differences between /processes/electromagnetic/utils/src/G4VMultipleScattering.cc (Version 11.3.0) and /processes/electromagnetic/utils/src/G4VMultipleScattering.cc (Version 11.2.1)


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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 //                                                 26 //
 27 // -------------------------------------------     27 // -------------------------------------------------------------------
 28 //                                                 28 //
 29 // GEANT4 Class file                               29 // GEANT4 Class file
 30 //                                                 30 //
 31 //                                                 31 //
 32 // File name:     G4VMultipleScattering            32 // File name:     G4VMultipleScattering
 33 //                                                 33 //
 34 // Author:        Vladimir Ivanchenko on base      34 // Author:        Vladimir Ivanchenko on base of Laszlo Urban code
 35 //                                                 35 //
 36 // Creation date: 25.03.2003                       36 // Creation date: 25.03.2003
 37 //                                                 37 //
 38 // Modifications:                                  38 // Modifications:
 39 //                                                 39 //
 40 // 16-07-03 Use G4VMscModel interface (V.Ivanc     40 // 16-07-03 Use G4VMscModel interface (V.Ivanchenko)
 41 // 03-11-03 Fix initialisation problem in Retr     41 // 03-11-03 Fix initialisation problem in RetrievePhysicsTable (V.Ivanchenko)
 42 // 04-11-03 Update PrintInfoDefinition (V.Ivan     42 // 04-11-03 Update PrintInfoDefinition (V.Ivanchenko)
 43 // 01-03-04 SampleCosineTheta signature change     43 // 01-03-04 SampleCosineTheta signature changed
 44 // 22-04-04 SampleCosineTheta signature change     44 // 22-04-04 SampleCosineTheta signature changed back to original
 45 // 27-08-04 Add InitialiseForRun method (V.Iva     45 // 27-08-04 Add InitialiseForRun method (V.Ivanchneko)
 46 // 08-11-04 Migration to new interface of Stor     46 // 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
 47 // 11-03-05 Shift verbose level by 1 (V.Ivantc     47 // 11-03-05 Shift verbose level by 1 (V.Ivantchenko)
 48 // 15-04-05 optimize internal interface (V.Iva     48 // 15-04-05 optimize internal interface (V.Ivanchenko)
 49 // 15-04-05 remove boundary flag (V.Ivanchenko     49 // 15-04-05 remove boundary flag (V.Ivanchenko)
 50 // 27-10-05 introduce virtual function MscStep     50 // 27-10-05 introduce virtual function MscStepLimitation() (V.Ivanchenko)
 51 // 12-04-07 Add verbosity at destruction (V.Iv     51 // 12-04-07 Add verbosity at destruction (V.Ivanchenko)
 52 // 27-10-07 Virtual functions moved to source      52 // 27-10-07 Virtual functions moved to source (V.Ivanchenko)
 53 // 11-03-08 Set skin value does not effect ste     53 // 11-03-08 Set skin value does not effect step limit type (V.Ivanchenko)
 54 // 24-06-09 Removed hidden bin in G4PhysicsVec     54 // 24-06-09 Removed hidden bin in G4PhysicsVector (V.Ivanchenko)
 55 // 04-06-13 Adoptation to MT mode (V.Ivanchenk     55 // 04-06-13 Adoptation to MT mode (V.Ivanchenko)
 56 //                                                 56 //
 57                                                    57 
 58 // -------------------------------------------     58 // -------------------------------------------------------------------
 59 //                                                 59 //
 60 //....oooOO0OOooo........oooOO0OOooo........oo     60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 61 //....oooOO0OOooo........oooOO0OOooo........oo     61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 62                                                    62 
 63 #include "G4VMultipleScattering.hh"                63 #include "G4VMultipleScattering.hh"
 64 #include "G4PhysicalConstants.hh"                  64 #include "G4PhysicalConstants.hh"
 65 #include "G4SystemOfUnits.hh"                      65 #include "G4SystemOfUnits.hh"
 66 #include "G4LossTableManager.hh"                   66 #include "G4LossTableManager.hh"
 67 #include "G4MaterialCutsCouple.hh"                 67 #include "G4MaterialCutsCouple.hh"
 68 #include "G4Step.hh"                               68 #include "G4Step.hh"
 69 #include "G4ParticleDefinition.hh"                 69 #include "G4ParticleDefinition.hh"
 70 #include "G4VEmFluctuationModel.hh"                70 #include "G4VEmFluctuationModel.hh"
 71 #include "G4UnitsTable.hh"                         71 #include "G4UnitsTable.hh"
 72 #include "G4ProductionCutsTable.hh"                72 #include "G4ProductionCutsTable.hh"
 73 #include "G4Electron.hh"                           73 #include "G4Electron.hh"
 74 #include "G4GenericIon.hh"                         74 #include "G4GenericIon.hh"
 75 #include "G4TransportationManager.hh"              75 #include "G4TransportationManager.hh"
 76 #include "G4SafetyHelper.hh"                       76 #include "G4SafetyHelper.hh"
 77 #include "G4ParticleTable.hh"                      77 #include "G4ParticleTable.hh"
 78 #include "G4ProcessVector.hh"                      78 #include "G4ProcessVector.hh"
 79 #include "G4ProcessManager.hh"                     79 #include "G4ProcessManager.hh"
 80 #include "G4LossTableBuilder.hh"                   80 #include "G4LossTableBuilder.hh"
 81 #include "G4EmTableUtil.hh"                        81 #include "G4EmTableUtil.hh"
 82 #include <iostream>                                82 #include <iostream>
 83                                                    83 
 84 //....oooOO0OOooo........oooOO0OOooo........oo     84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 85                                                    85 
 86 G4VMultipleScattering::G4VMultipleScattering(c     86 G4VMultipleScattering::G4VMultipleScattering(const G4String&, G4ProcessType)
 87   : G4VContinuousDiscreteProcess("msc", fElect     87   : G4VContinuousDiscreteProcess("msc", fElectromagnetic),
 88   fNewPosition(0.,0.,0.),                          88   fNewPosition(0.,0.,0.),
 89   fNewDirection(0.,0.,1.)                          89   fNewDirection(0.,0.,1.)
 90 {                                                  90 {
 91   theParameters = G4EmParameters::Instance();      91   theParameters = G4EmParameters::Instance();
 92   SetVerboseLevel(1);                              92   SetVerboseLevel(1);
 93   SetProcessSubType(fMultipleScattering);          93   SetProcessSubType(fMultipleScattering);
 94                                                    94 
 95   lowestKinEnergy = 10*CLHEP::eV;                  95   lowestKinEnergy = 10*CLHEP::eV;
 96                                                    96 
 97   geomMin = 0.05*CLHEP::nm;                        97   geomMin = 0.05*CLHEP::nm;
 98   minDisplacement2 = geomMin*geomMin;              98   minDisplacement2 = geomMin*geomMin;
 99                                                    99 
100   pParticleChange = &fParticleChange;             100   pParticleChange = &fParticleChange;
101                                                   101 
102   modelManager = new G4EmModelManager();          102   modelManager = new G4EmModelManager();
103   emManager = G4LossTableManager::Instance();     103   emManager = G4LossTableManager::Instance();
104   mscModels.reserve(2);                           104   mscModels.reserve(2);
105   emManager->Register(this);                      105   emManager->Register(this);
106 }                                                 106 }
107                                                   107 
108 //....oooOO0OOooo........oooOO0OOooo........oo    108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
109                                                   109 
110 G4VMultipleScattering::~G4VMultipleScattering(    110 G4VMultipleScattering::~G4VMultipleScattering()
111 {                                                 111 {
112   delete modelManager;                            112   delete modelManager;
113   emManager->DeRegister(this);                    113   emManager->DeRegister(this);
114 }                                                 114 }
115                                                   115 
116 //....oooOO0OOooo........oooOO0OOooo........oo    116 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
117                                                   117 
118 void G4VMultipleScattering::AddEmModel(G4int o    118 void G4VMultipleScattering::AddEmModel(G4int order, G4VMscModel* ptr,
119                                        const G    119                                        const G4Region* region)
120 {                                                 120 {
121   if(nullptr == ptr) { return; }                  121   if(nullptr == ptr) { return; }
122   G4VEmFluctuationModel* fm = nullptr;            122   G4VEmFluctuationModel* fm = nullptr;
123   modelManager->AddEmModel(order, ptr, fm, reg    123   modelManager->AddEmModel(order, ptr, fm, region);
124   ptr->SetParticleChange(pParticleChange);        124   ptr->SetParticleChange(pParticleChange);
125 }                                                 125 }
126                                                   126 
127 //....oooOO0OOooo........oooOO0OOooo........oo    127 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
128                                                   128 
129 void G4VMultipleScattering::SetEmModel(G4VMscM    129 void G4VMultipleScattering::SetEmModel(G4VMscModel* ptr, G4int)
130 {                                                 130 {
131   if(nullptr == ptr) { return; }                  131   if(nullptr == ptr) { return; }
132   if(!mscModels.empty()) {                        132   if(!mscModels.empty()) { 
133     for(auto & msc : mscModels) { if(msc == pt    133     for(auto & msc : mscModels) { if(msc == ptr) { return; } } 
134   }                                               134   }
135   mscModels.push_back(ptr);                       135   mscModels.push_back(ptr);
136 }                                                 136 }
137                                                   137 
138 //....oooOO0OOooo........oooOO0OOooo........oo    138 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
139                                                   139 
140 void                                              140 void 
141 G4VMultipleScattering::PreparePhysicsTable(con    141 G4VMultipleScattering::PreparePhysicsTable(const G4ParticleDefinition& part)
142 {                                                 142 {
143   G4bool master = emManager->IsMaster();          143   G4bool master = emManager->IsMaster();
144   if (nullptr == firstParticle) { firstParticl << 144   if(nullptr == firstParticle) { firstParticle = &part; }
145                                                   145 
146   emManager->PreparePhysicsTable(&part, this);    146   emManager->PreparePhysicsTable(&part, this);
147   currParticle = nullptr;                         147   currParticle = nullptr;
148                                                   148 
149   if(firstParticle == &part) {                    149   if(firstParticle == &part) {
150     baseMat = emManager->GetTableBuilder()->Ge    150     baseMat = emManager->GetTableBuilder()->GetBaseMaterialFlag();
                                                   >> 151 
151     G4EmTableUtil::PrepareMscProcess(this, par    152     G4EmTableUtil::PrepareMscProcess(this, part, modelManager,
152              stepLimit, facrange,              << 153                                      stepLimit, facrange,
153              latDisplacement, master,          << 154                                      latDisplacement, master,
154              isIon, baseMat);                  << 155                                      isIon, baseMat);
155                                                   156 
156     numberOfModels = modelManager->NumberOfMod    157     numberOfModels = modelManager->NumberOfModels();
157     currentModel = GetModelByIndex(0);            158     currentModel = GetModelByIndex(0);
158                                                   159 
159     if (nullptr == safetyHelper) {             << 160     if(nullptr == safetyHelper) {
160       safetyHelper = G4TransportationManager::    161       safetyHelper = G4TransportationManager::GetTransportationManager()
161   ->GetSafetyHelper();                         << 162         ->GetSafetyHelper();
162       safetyHelper->InitialiseHelper();           163       safetyHelper->InitialiseHelper();
163     }                                             164     }
164   }                                               165   }
165 }                                                 166 }
166                                                   167 
167 //....oooOO0OOooo........oooOO0OOooo........oo    168 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
168                                                   169 
169 void G4VMultipleScattering::BuildPhysicsTable(    170 void G4VMultipleScattering::BuildPhysicsTable(const G4ParticleDefinition& part)
170 {                                                 171 {
171   G4bool master = emManager->IsMaster();          172   G4bool master = emManager->IsMaster();
172                                                   173 
173   if(firstParticle == &part) {                 << 174   if(firstParticle == &part) { 
174     emManager->BuildPhysicsTable(&part);       << 175     emManager->BuildPhysicsTable(firstParticle);
175   }                                               176   }
176   const G4VMultipleScattering* ptr = this;        177   const G4VMultipleScattering* ptr = this;
177   if(!master) {                                   178   if(!master) {
178     ptr = static_cast<const G4VMultipleScatter    179     ptr = static_cast<const G4VMultipleScattering*>(GetMasterProcess());
179   }                                               180   }
180                                                   181 
181   G4EmTableUtil::BuildMscProcess(this, ptr, pa    182   G4EmTableUtil::BuildMscProcess(this, ptr, part, firstParticle,
182          numberOfModels, master);                 183          numberOfModels, master);
183 }                                                 184 }
184                                                   185 
185 //....oooOO0OOooo........oooOO0OOooo........oo    186 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
186                                                   187 
187 void G4VMultipleScattering::StreamInfo(std::os    188 void G4VMultipleScattering::StreamInfo(std::ostream& outFile, 
188                   const G4ParticleDefinition&     189                   const G4ParticleDefinition& part, G4bool rst) const
189 {                                                 190 {
190   G4String indent = (rst ? "  " : "");            191   G4String indent = (rst ? "  " : "");
191   outFile << G4endl << indent << GetProcessNam    192   outFile << G4endl << indent << GetProcessName() << ": ";
192   if (!rst) outFile << " for " << part.GetPart    193   if (!rst) outFile << " for " << part.GetParticleName();
193   outFile  << "  SubType= " << GetProcessSubTy    194   outFile  << "  SubType= " << GetProcessSubType() << G4endl;
194   modelManager->DumpModelList(outFile, verbose    195   modelManager->DumpModelList(outFile, verboseLevel);
195 }                                                 196 }
196                                                   197 
197 //....oooOO0OOooo........oooOO0OOooo........oo    198 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
198                                                   199 
199 void G4VMultipleScattering::StartTracking(G4Tr    200 void G4VMultipleScattering::StartTracking(G4Track* track)
200 {                                                 201 {
201   G4VEnergyLossProcess* eloss = nullptr;          202   G4VEnergyLossProcess* eloss = nullptr;
202   if(track->GetParticleDefinition() != currPar    203   if(track->GetParticleDefinition() != currParticle) {
203     currParticle = track->GetParticleDefinitio    204     currParticle = track->GetParticleDefinition();
204     fIonisation = emManager->GetEnergyLossProc    205     fIonisation = emManager->GetEnergyLossProcess(currParticle);
205     eloss = fIonisation;                          206     eloss = fIonisation;
206   }                                               207   }
207   for(G4int i=0; i<numberOfModels; ++i) {         208   for(G4int i=0; i<numberOfModels; ++i) {
208     G4VMscModel* msc = GetModelByIndex(i);        209     G4VMscModel* msc = GetModelByIndex(i);
209     msc->StartTracking(track);                    210     msc->StartTracking(track);
210     if(nullptr != eloss) {                        211     if(nullptr != eloss) {
211       msc->SetIonisation(eloss, currParticle);    212       msc->SetIonisation(eloss, currParticle);
212     }                                             213     }
213   }                                               214   }
214 }                                                 215 }
215                                                   216 
216 //....oooOO0OOooo........oooOO0OOooo........oo    217 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
217                                                   218 
218 G4double G4VMultipleScattering::AlongStepGetPh    219 G4double G4VMultipleScattering::AlongStepGetPhysicalInteractionLength(
219                              const G4Track& tr    220                              const G4Track& track,
220                              G4double,            221                              G4double,
221                              G4double currentM    222                              G4double currentMinimalStep,
222                              G4double&,           223                              G4double&,
223                              G4GPILSelection*     224                              G4GPILSelection* selection)
224 {                                                 225 {
225   // get Step limit proposed by the process       226   // get Step limit proposed by the process
226   *selection = NotCandidateForSelection;          227   *selection = NotCandidateForSelection;
227   physStepLimit = gPathLength = tPathLength =     228   physStepLimit = gPathLength = tPathLength = currentMinimalStep;
228                                                   229 
229   G4double ekin = track.GetKineticEnergy();       230   G4double ekin = track.GetKineticEnergy();
230   /*                                              231   /*
231   G4cout << "MSC::AlongStepGPIL: Ekin= " << ek    232   G4cout << "MSC::AlongStepGPIL: Ekin= " << ekin
232          << "  " << currParticle->GetParticleN    233          << "  " << currParticle->GetParticleName() 
233          << " currMod " << currentModel           234          << " currMod " << currentModel 
234          << G4endl;                               235          << G4endl;
235   */                                              236   */
236   // isIon flag is used only to select a model    237   // isIon flag is used only to select a model
237   if(isIon) {                                     238   if(isIon) { 
238     ekin *= proton_mass_c2/track.GetParticleDe    239     ekin *= proton_mass_c2/track.GetParticleDefinition()->GetPDGMass(); 
239   }                                               240   }
240   const G4MaterialCutsCouple* couple = track.G    241   const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple();
241                                                   242   
242   // select new model, static cast is possible    243   // select new model, static cast is possible in this class
243   if(1 < numberOfModels) {                        244   if(1 < numberOfModels) {
244     currentModel =                                245     currentModel =
245       static_cast<G4VMscModel*>(SelectModel(ek    246       static_cast<G4VMscModel*>(SelectModel(ekin,couple->GetIndex()));
246   }                                               247   }
247   currentModel->SetCurrentCouple(couple);         248   currentModel->SetCurrentCouple(couple);
248   // msc is active is model is active, energy     249   // msc is active is model is active, energy above the limit,
249   // and step size is above the limit;            250   // and step size is above the limit;
250   // if it is active msc may limit the step       251   // if it is active msc may limit the step
251   if(currentModel->IsActive(ekin) && tPathLeng    252   if(currentModel->IsActive(ekin) && tPathLength > geomMin
252      && ekin >= lowestKinEnergy) {                253      && ekin >= lowestKinEnergy) {
253     isActive = true;                              254     isActive = true;
254     tPathLength =                                 255     tPathLength = 
255       currentModel->ComputeTruePathLengthLimit    256       currentModel->ComputeTruePathLengthLimit(track, gPathLength);
256     if (tPathLength < physStepLimit) {            257     if (tPathLength < physStepLimit) { 
257       *selection = CandidateForSelection;         258       *selection = CandidateForSelection; 
258     }                                             259     }
259   } else {                                        260   } else { 
260     isActive = false;                             261     isActive = false;
261     gPathLength = DBL_MAX;                        262     gPathLength = DBL_MAX;
262   }                                               263   }
263                                                   264   
264   //if(currParticle->GetPDGMass() > GeV)          265   //if(currParticle->GetPDGMass() > GeV)    
265   /*                                              266   /*
266   G4cout << "MSC::AlongStepGPIL: Ekin= " << ek    267   G4cout << "MSC::AlongStepGPIL: Ekin= " << ekin
267          << "  " << currParticle->GetParticleN    268          << "  " << currParticle->GetParticleName()
268          << " gPathLength= " << gPathLength       269          << " gPathLength= " << gPathLength
269          << " tPathLength= " << tPathLength       270          << " tPathLength= " << tPathLength
270          << " currentMinimalStep= " << current    271          << " currentMinimalStep= " << currentMinimalStep
271          << " isActive " << isActive << G4endl    272          << " isActive " << isActive << G4endl;
272   */                                              273   */
273   return gPathLength;                             274   return gPathLength;
274 }                                                 275 }
275                                                   276 
276 //....oooOO0OOooo........oooOO0OOooo........oo    277 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
277                                                   278 
278 G4double                                          279 G4double 
279 G4VMultipleScattering::PostStepGetPhysicalInte    280 G4VMultipleScattering::PostStepGetPhysicalInteractionLength(
280               const G4Track&, G4double, G4Forc    281               const G4Track&, G4double, G4ForceCondition* condition)
281 {                                                 282 {
282   *condition = NotForced;                         283   *condition = NotForced;
283   return DBL_MAX;                                 284   return DBL_MAX;
284 }                                                 285 }
285                                                   286 
286 //....oooOO0OOooo........oooOO0OOooo........oo    287 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
287                                                   288 
288 G4VParticleChange*                                289 G4VParticleChange* 
289 G4VMultipleScattering::AlongStepDoIt(const G4T    290 G4VMultipleScattering::AlongStepDoIt(const G4Track& track, const G4Step& step)
290 {                                                 291 {
291   fParticleChange.InitialiseMSC(track, step);     292   fParticleChange.InitialiseMSC(track, step);
292   fNewPosition = fParticleChange.GetProposedPo    293   fNewPosition = fParticleChange.GetProposedPosition();
293   fPositionChanged = false;                       294   fPositionChanged = false;
294                                                   295 
295   G4double geomLength = step.GetStepLength();     296   G4double geomLength = step.GetStepLength();
296                                                   297 
297   // very small step - no msc                     298   // very small step - no msc
298   if(!isActive) {                                 299   if(!isActive) {
299     tPathLength = geomLength;                     300     tPathLength = geomLength;
300                                                   301 
301     // sample msc                                 302     // sample msc
302   } else {                                        303   } else {
303     G4double range =                              304     G4double range = 
304       currentModel->GetRange(currParticle,trac    305       currentModel->GetRange(currParticle,track.GetKineticEnergy(),
305                              track.GetMaterial    306                              track.GetMaterialCutsCouple());
306                                                   307 
307     tPathLength = currentModel->ComputeTrueSte    308     tPathLength = currentModel->ComputeTrueStepLength(geomLength);
308                                                   309   
309     /*                                            310     /*    
310     if(currParticle->GetPDGMass() > 0.9*GeV)      311     if(currParticle->GetPDGMass() > 0.9*GeV)    
311     G4cout << "G4VMsc::AlongStepDoIt: GeomLeng    312     G4cout << "G4VMsc::AlongStepDoIt: GeomLength= " 
312            << geomLength                          313            << geomLength 
313            << " tPathLength= " << tPathLength     314            << " tPathLength= " << tPathLength
314            << " physStepLimit= " << physStepLi    315            << " physStepLimit= " << physStepLimit
315            << " dr= " << range - tPathLength      316            << " dr= " << range - tPathLength
316            << " ekin= " << track.GetKineticEne    317            << " ekin= " << track.GetKineticEnergy() << G4endl;
317     */                                            318     */
318     // protection against wrong t->g->t conver    319     // protection against wrong t->g->t conversion
319     tPathLength = std::min(tPathLength, physSt    320     tPathLength = std::min(tPathLength, physStepLimit);
320                                                   321 
321     // do not sample scattering at the last or    322     // do not sample scattering at the last or at a small step
322     if(tPathLength < range && tPathLength > ge    323     if(tPathLength < range && tPathLength > geomMin) {
323                                                   324 
324       static const G4double minSafety = 1.20*C    325       static const G4double minSafety = 1.20*CLHEP::nm;
325       static const G4double sFact = 0.99;         326       static const G4double sFact = 0.99;
326                                                   327 
327       G4ThreeVector displacement = currentMode    328       G4ThreeVector displacement = currentModel->SampleScattering(
328         step.GetPostStepPoint()->GetMomentumDi    329         step.GetPostStepPoint()->GetMomentumDirection(),minSafety);
329                                                   330 
330       G4double r2 = displacement.mag2();          331       G4double r2 = displacement.mag2();
331       //G4cout << "    R= " << sqrt(r2) << " R    332       //G4cout << "    R= " << sqrt(r2) << " Rmin= " << sqrt(minDisplacement2)
332       //     << " flag= " << fDispBeyondSafety    333       //     << " flag= " << fDispBeyondSafety << G4endl;
333       if(r2 > minDisplacement2) {                 334       if(r2 > minDisplacement2) {
334                                                   335 
335         fPositionChanged = true;                  336         fPositionChanged = true;
336         G4double dispR = std::sqrt(r2);           337         G4double dispR = std::sqrt(r2);
337         G4double postSafety =                     338         G4double postSafety = 
338           sFact*safetyHelper->ComputeSafety(fN    339           sFact*safetyHelper->ComputeSafety(fNewPosition, dispR); 
339         //G4cout<<"    R= "<< dispR<<" postSaf    340         //G4cout<<"    R= "<< dispR<<" postSafety= "<<postSafety<<G4endl;
340                                                   341 
341         // far away from geometry boundary        342         // far away from geometry boundary
342         if(postSafety > 0.0 && dispR <= postSa    343         if(postSafety > 0.0 && dispR <= postSafety) {
343           fNewPosition += displacement;           344           fNewPosition += displacement;
344                                                   345 
345           //near the boundary                     346           //near the boundary
346         } else {                                  347         } else {
347           // displaced point is definitely wit    348           // displaced point is definitely within the volume
348           //G4cout<<"    R= "<<dispR<<" postSa    349           //G4cout<<"    R= "<<dispR<<" postSafety= "<<postSafety<<G4endl;
349           if(dispR < postSafety) {                350           if(dispR < postSafety) {
350             fNewPosition += displacement;         351             fNewPosition += displacement;
351                                                   352 
352             // reduced displacement               353             // reduced displacement
353           } else if(postSafety > geomMin) {       354           } else if(postSafety > geomMin) {
354             fNewPosition += displacement*(post    355             fNewPosition += displacement*(postSafety/dispR); 
355                                                   356 
356             // very small postSafety              357             // very small postSafety
357           } else {                                358           } else {
358             fPositionChanged = false;             359             fPositionChanged = false;
359           }                                       360           }
360         }                                         361         }
361         if(fPositionChanged) {                    362         if(fPositionChanged) { 
362           safetyHelper->ReLocateWithinVolume(f    363           safetyHelper->ReLocateWithinVolume(fNewPosition);
363           fParticleChange.ProposePosition(fNew    364           fParticleChange.ProposePosition(fNewPosition); 
364         }                                         365         }
365       }                                           366       }
366     }                                             367     }
367   }                                               368   }
368   fParticleChange.ProposeTrueStepLength(tPathL    369   fParticleChange.ProposeTrueStepLength(tPathLength);
369   return &fParticleChange;                        370   return &fParticleChange;
370 }                                                 371 }
371                                                   372 
372 //....oooOO0OOooo........oooOO0OOooo........oo    373 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
373                                                   374 
374 G4double G4VMultipleScattering::GetContinuousS    375 G4double G4VMultipleScattering::GetContinuousStepLimit(
375                                        const G    376                                        const G4Track& track,
376                                        G4doubl    377                                        G4double previousStepSize,
377                                        G4doubl    378                                        G4double currentMinimalStep,
378                                        G4doubl    379                                        G4double& currentSafety)
379 {                                                 380 {
380   G4GPILSelection selection = NotCandidateForS    381   G4GPILSelection selection = NotCandidateForSelection;
381   G4double x = AlongStepGetPhysicalInteraction    382   G4double x = AlongStepGetPhysicalInteractionLength(track,previousStepSize,
382                                                   383                                                      currentMinimalStep,
383                                                   384                                                      currentSafety, 
384                                                   385                                                      &selection);
385   return x;                                       386   return x;
386 }                                                 387 }
387                                                   388 
388 //....oooOO0OOooo........oooOO0OOooo........oo    389 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
389                                                   390 
390 G4double G4VMultipleScattering::ContinuousStep    391 G4double G4VMultipleScattering::ContinuousStepLimit(
391                                        const G    392                                        const G4Track& track,
392                                        G4doubl    393                                        G4double previousStepSize,
393                                        G4doubl    394                                        G4double currentMinimalStep,
394                                        G4doubl    395                                        G4double& currentSafety)
395 {                                                 396 {
396   return GetContinuousStepLimit(track,previous    397   return GetContinuousStepLimit(track,previousStepSize,currentMinimalStep,
397                                 currentSafety)    398                                 currentSafety);
398 }                                                 399 }
399                                                   400 
400 //....oooOO0OOooo........oooOO0OOooo........oo    401 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
401                                                   402 
402 G4double G4VMultipleScattering::GetMeanFreePat    403 G4double G4VMultipleScattering::GetMeanFreePath(
403               const G4Track&, G4double, G4Forc    404               const G4Track&, G4double, G4ForceCondition* condition)
404 {                                                 405 {
405   *condition = Forced;                            406   *condition = Forced;
406   return DBL_MAX;                                 407   return DBL_MAX;
407 }                                                 408 }
408                                                   409 
409 //....oooOO0OOooo........oooOO0OOooo........oo    410 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
410                                                   411 
411 G4bool                                            412 G4bool 
412 G4VMultipleScattering::StorePhysicsTable(const    413 G4VMultipleScattering::StorePhysicsTable(const G4ParticleDefinition* part,
413                                          const    414                                          const G4String& directory,
414                                          G4boo    415                                          G4bool ascii)
415 {                                                 416 {
416   G4bool yes = true;                              417   G4bool yes = true;
417   if(part != firstParticle || !emManager->IsMa    418   if(part != firstParticle || !emManager->IsMaster()) { return yes; }
418                                                   419 
419   return G4EmTableUtil::StoreMscTable(this, pa    420   return G4EmTableUtil::StoreMscTable(this, part, directory,
420               numberOfModels, verboseLevel,       421               numberOfModels, verboseLevel,
421                                       ascii);     422                                       ascii);
422 }                                                 423 }
423                                                   424 
424 //....oooOO0OOooo........oooOO0OOooo........oo    425 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
425                                                   426 
426 G4bool                                            427 G4bool 
427 G4VMultipleScattering::RetrievePhysicsTable(co    428 G4VMultipleScattering::RetrievePhysicsTable(const G4ParticleDefinition*,
428                                             co    429                                             const G4String&,
429                                             G4    430                                             G4bool)
430 {                                                 431 {
431   return true;                                    432   return true;
432 }                                                 433 }
433                                                   434 
434 //....oooOO0OOooo........oooOO0OOooo........oo    435 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
435                                                   436 
436 void G4VMultipleScattering::ProcessDescription    437 void G4VMultipleScattering::ProcessDescription(std::ostream& outFile) const
437 {                                                 438 {
438   if(nullptr != firstParticle) {                  439   if(nullptr != firstParticle) {
439     StreamInfo(outFile, *firstParticle, true);    440     StreamInfo(outFile, *firstParticle, true);
440   }                                               441   }
441 }                                                 442 }
442                                                   443 
443 //....oooOO0OOooo........oooOO0OOooo........oo    444 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
444                                                   445 
445                                                   446