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