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25 // 22 //
>> 23 //
>> 24 // $Id: G4Cerenkov.cc,v 1.14 2003/02/12 08:52:55 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-05-02-patch-01 $
>> 26 //
26 ////////////////////////////////////////////// 27 ////////////////////////////////////////////////////////////////////////
27 // Cerenkov Radiation Class Implementation 28 // Cerenkov Radiation Class Implementation
28 ////////////////////////////////////////////// 29 ////////////////////////////////////////////////////////////////////////
29 // 30 //
30 // File: G4Cerenkov.cc << 31 // File: G4Cerenkov.cc
31 // Description: Discrete Process -- Generation << 32 // Description: Continuous Process -- Generation of Cerenkov Photons
32 // Version: 2.1 33 // Version: 2.1
33 // Created: 1996-02-21 << 34 // Created: 1996-02-21
34 // Author: Juliet Armstrong 35 // Author: Juliet Armstrong
35 // Updated: 2007-09-30 by Peter Gumplinger << 36 // Updated: 2001-09-17, migration of Materials to pure STL (mma)
36 // > change inheritance to G4VDis <<
37 // GetContinuousStepLimit -> GetM <<
38 // AlongStepDoIt -> PostStepDoIt <<
39 // 2005-08-17 by Peter Gumplinger <<
40 // > change variable name MeanNum <<
41 // 2005-07-28 by Peter Gumplinger <<
42 // > add G4ProcessType to constru <<
43 // 2001-09-17, migration of Mater <<
44 // 2000-11-12 by Peter Gumplinger 37 // 2000-11-12 by Peter Gumplinger
45 // > add check on CerenkovAngleIn 38 // > add check on CerenkovAngleIntegrals->IsFilledVectorExist()
46 // in method GetAverageNumberOfPh << 39 // in method GetAverageNumberOfPhotons
47 // > and a test for MeanNumberOfP << 40 // > and a test for MeanNumPhotons <= 0.0 in DoIt
48 // 2000-09-18 by Peter Gumplinger 41 // 2000-09-18 by Peter Gumplinger
49 // > change: aSecondaryPosition=x 42 // > change: aSecondaryPosition=x0+rand*aStep.GetDeltaPosition();
50 // aSecondaryTrack->Set 43 // aSecondaryTrack->SetTouchable(0);
51 // 1999-10-29 by Peter Gumplinger 44 // 1999-10-29 by Peter Gumplinger
52 // > change: == into <= in GetCon 45 // > change: == into <= in GetContinuousStepLimit
53 // 1997-08-08 by Peter Gumplinger 46 // 1997-08-08 by Peter Gumplinger
54 // > add protection against /0 47 // > add protection against /0
55 // > G4MaterialPropertiesTable; n 48 // > G4MaterialPropertiesTable; new physics/tracking scheme
56 // 49 //
>> 50 // mail: gum@triumf.ca
>> 51 //
57 ////////////////////////////////////////////// 52 ////////////////////////////////////////////////////////////////////////
58 53
59 #include "G4Cerenkov.hh" <<
60 <<
61 #include "G4ios.hh" 54 #include "G4ios.hh"
62 #include "G4LossTableManager.hh" <<
63 #include "G4Material.hh" <<
64 #include "G4MaterialCutsCouple.hh" <<
65 #include "G4MaterialPropertiesTable.hh" <<
66 #include "G4OpticalParameters.hh" <<
67 #include "G4OpticalPhoton.hh" <<
68 #include "G4ParticleDefinition.hh" <<
69 #include "G4ParticleMomentum.hh" <<
70 #include "G4PhysicalConstants.hh" <<
71 #include "G4PhysicsFreeVector.hh" <<
72 #include "G4Poisson.hh" 55 #include "G4Poisson.hh"
73 #include "G4SystemOfUnits.hh" << 56 #include "G4Cerenkov.hh"
74 #include "G4ThreeVector.hh" <<
75 #include "Randomize.hh" <<
76 #include "G4PhysicsModelCatalog.hh" <<
77 <<
78 //....oooOO0OOooo........oooOO0OOooo........oo <<
79 G4Cerenkov::G4Cerenkov(const G4String& process <<
80 : G4VProcess(processName, type) <<
81 , fNumPhotons(0) <<
82 { <<
83 secID = G4PhysicsModelCatalog::GetModelID("m <<
84 SetProcessSubType(fCerenkov); <<
85 57
86 thePhysicsTable = nullptr; << 58 /////////////////////////
>> 59 // Class Implementation
>> 60 /////////////////////////
87 61
88 if(verboseLevel > 0) << 62 //////////////
89 { << 63 // Operators
90 G4cout << GetProcessName() << " is created << 64 //////////////
91 } <<
92 Initialise(); <<
93 } <<
94 65
95 //....oooOO0OOooo........oooOO0OOooo........oo << 66 // G4Cerenkov::operator=(const G4Cerenkov &right)
96 G4Cerenkov::~G4Cerenkov() << 67 // {
97 { << 68 // }
98 if(thePhysicsTable != nullptr) <<
99 { <<
100 thePhysicsTable->clearAndDestroy(); <<
101 delete thePhysicsTable; <<
102 } <<
103 } <<
104 69
105 void G4Cerenkov::ProcessDescription(std::ostre << 70 /////////////////
106 { << 71 // Constructors
107 out << "The Cerenkov effect simulates optica << 72 /////////////////
108 out << "passage of charged particles through <<
109 out << "to have the property RINDEX (refract <<
110 G4VProcess::DumpInfo(); <<
111 <<
112 G4OpticalParameters* params = G4OpticalParam <<
113 out << "Maximum beta change per step: " << p <<
114 out << "Maximum photons per step: " << param <<
115 out << "Track secondaries first: " <<
116 << params->GetCerenkovTrackSecondariesFi <<
117 out << "Stack photons: " << params->GetCeren <<
118 out << "Verbose level: " << params->GetCeren <<
119 } <<
120 73
121 //....oooOO0OOooo........oooOO0OOooo........oo << 74 G4Cerenkov::G4Cerenkov(const G4String& processName)
122 G4bool G4Cerenkov::IsApplicable(const G4Partic << 75 : G4VContinuousProcess(processName)
123 { 76 {
124 return (aParticleType.GetPDGCharge() != 0.0 << 77 fTrackSecondariesFirst = false;
125 aParticleType.GetPDGMass() != 0.0 && << 78 fMaxPhotons = 0;
126 aParticleType.GetParticleName() != " <<
127 !aParticleType.IsShortLived()) <<
128 ? true <<
129 : false; <<
130 } <<
131 79
132 //....oooOO0OOooo........oooOO0OOooo........oo << 80 thePhysicsTable = NULL;
133 void G4Cerenkov::Initialise() <<
134 { <<
135 G4OpticalParameters* params = G4OpticalParam <<
136 SetMaxBetaChangePerStep(params->GetCerenkovM <<
137 SetMaxNumPhotonsPerStep(params->GetCerenkovM <<
138 SetTrackSecondariesFirst(params->GetCerenkov <<
139 SetStackPhotons(params->GetCerenkovStackPhot <<
140 SetVerboseLevel(params->GetCerenkovVerboseLe <<
141 } <<
142 81
143 //....oooOO0OOooo........oooOO0OOooo........oo << 82 if (verboseLevel>0) {
144 void G4Cerenkov::BuildPhysicsTable(const G4Par << 83 G4cout << GetProcessName() << " is created " << G4endl;
145 { << 84 }
146 if(thePhysicsTable) <<
147 return; <<
148 85
149 const G4MaterialTable* theMaterialTable = G4 << 86 BuildThePhysicsTable();
150 std::size_t numOfMaterials = G4 << 87 }
151 88
152 thePhysicsTable = new G4PhysicsTable(numOfMa << 89 // G4Cerenkov::G4Cerenkov(const G4Cerenkov &right)
>> 90 // {
>> 91 // }
153 92
154 // loop over materials << 93 ////////////////
155 for(std::size_t i = 0; i < numOfMaterials; + << 94 // Destructors
156 { << 95 ////////////////
157 G4PhysicsFreeVector* cerenkovIntegral = nu <<
158 <<
159 // Retrieve vector of refraction indices f <<
160 // from the material's optical properties <<
161 G4Material* aMaterial = (*theMate <<
162 G4MaterialPropertiesTable* MPT = aMaterial <<
163 <<
164 if(MPT) <<
165 { <<
166 cerenkovIntegral <<
167 G4MaterialPropertyVector* refractiveInde <<
168 <<
169 if(refractiveIndex) <<
170 { <<
171 // Retrieve the first refraction index <<
172 // of (photon energy, refraction index <<
173 G4double currentRI = (*refractiveIndex <<
174 if(currentRI > 1.0) <<
175 { <<
176 // Create first (photon energy, Cere <<
177 G4double currentPM = refractiveInde <<
178 G4double currentCAI = 0.0; <<
179 <<
180 cerenkovIntegral->InsertValues(curre <<
181 <<
182 // Set previous values to current on <<
183 G4double prevPM = currentPM; <<
184 G4double prevCAI = currentCAI; <<
185 G4double prevRI = currentRI; <<
186 <<
187 // loop over all (photon energy, ref <<
188 // pairs stored for this material <<
189 for(std::size_t ii = 1; ii < refract <<
190 { <<
191 currentRI = (*refractiveIndex)[ii <<
192 currentPM = refractiveIndex->Ener <<
193 currentCAI = prevCAI + (currentPM <<
194 (1.0 / (p <<
195 1.0 / (c <<
196 <<
197 cerenkovIntegral->InsertValues(cur <<
198 <<
199 prevPM = currentPM; <<
200 prevCAI = currentCAI; <<
201 prevRI = currentRI; <<
202 } <<
203 } <<
204 } <<
205 } <<
206 96
207 // The Cerenkov integral for a given mater << 97 G4Cerenkov::~G4Cerenkov()
208 // thePhysicsTable according to the positi << 98 {
209 // the material table. << 99 if (thePhysicsTable != NULL) {
210 thePhysicsTable->insertAt(i, cerenkovInteg << 100 thePhysicsTable->clearAndDestroy();
211 } << 101 delete thePhysicsTable;
>> 102 }
212 } 103 }
213 104
214 //....oooOO0OOooo........oooOO0OOooo........oo << 105 ////////////
215 G4VParticleChange* G4Cerenkov::PostStepDoIt(co << 106 // Methods
216 co << 107 ////////////
>> 108
>> 109 // AlongStepDoIt
>> 110 // -------------
>> 111 //
>> 112 G4VParticleChange*
>> 113 G4Cerenkov::AlongStepDoIt(const G4Track& aTrack, const G4Step& aStep)
>> 114
217 // This routine is called for each tracking St 115 // This routine is called for each tracking Step of a charged particle
218 // in a radiator. A Poisson-distributed number 116 // in a radiator. A Poisson-distributed number of photons is generated
219 // according to the Cerenkov formula, distribu 117 // according to the Cerenkov formula, distributed evenly along the track
220 // segment and uniformly azimuth w.r.t. the pa << 118 // segment and uniformly azimuth w.r.t. the particle direction. The
221 // parameters are then transformed into the Ma << 119 // parameters are then transformed into the Master Reference System, and
222 // they are added to the particle change. << 120 // they are added to the particle change.
223 121
224 { 122 {
225 aParticleChange.Initialize(aTrack); << 123 //////////////////////////////////////////////////////
>> 124 // Should we ensure that the material is dispersive?
>> 125 //////////////////////////////////////////////////////
226 126
227 const G4DynamicParticle* aParticle = aTrack. << 127 aParticleChange.Initialize(aTrack);
228 const G4Material* aMaterial = aTrack. <<
229 128
230 G4StepPoint* pPreStepPoint = aStep.GetPreSt << 129 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
231 G4StepPoint* pPostStepPoint = aStep.GetPostS << 130 const G4Material* aMaterial = aTrack.GetMaterial();
232 131
233 G4ThreeVector x0 = pPreStepPoint->GetPositio << 132 G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint();
234 G4ThreeVector p0 = aStep.GetDeltaPosition(). << 133 G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint();
235 G4double t0 = pPreStepPoint->GetGlobalT <<
236 <<
237 G4MaterialPropertiesTable* MPT = aMaterial-> <<
238 if(!MPT) <<
239 return pParticleChange; <<
240 <<
241 G4MaterialPropertyVector* Rindex = MPT->GetP <<
242 if(!Rindex) <<
243 return pParticleChange; <<
244 <<
245 G4double charge = aParticle->GetDefinition() <<
246 <<
247 G4double beta1 = pPreStepPoint->GetBeta(); <<
248 G4double beta2 = pPostStepPoint->GetBeta(); <<
249 G4double beta = (beta1 + beta2) * 0.5; <<
250 <<
251 G4double MeanNumberOfPhotons = <<
252 GetAverageNumberOfPhotons(charge, beta, aM <<
253 G4double MeanNumberOfPhotons1 = <<
254 GetAverageNumberOfPhotons(charge, beta1, a <<
255 G4double MeanNumberOfPhotons2 = <<
256 GetAverageNumberOfPhotons(charge, beta2, a <<
257 <<
258 if(MeanNumberOfPhotons <= 0.0) <<
259 { <<
260 // return unchanged particle and no second <<
261 aParticleChange.SetNumberOfSecondaries(0); <<
262 return pParticleChange; <<
263 } <<
264 <<
265 MeanNumberOfPhotons *= aStep.GetStepLength() <<
266 fNumPhotons = (G4int) G4Poisson(Mean <<
267 <<
268 // third condition added to prevent infinite <<
269 // see bugzilla 2555 <<
270 if(fNumPhotons <= 0 || !fStackingFlag || <<
271 std::max(MeanNumberOfPhotons1, MeanNumber <<
272 { <<
273 // return unchanged particle and no second <<
274 aParticleChange.SetNumberOfSecondaries(0); <<
275 return pParticleChange; <<
276 } <<
277 <<
278 //////////////////////////////////////////// <<
279 aParticleChange.SetNumberOfSecondaries(fNumP <<
280 <<
281 if(fTrackSecondariesFirst) <<
282 { <<
283 if(aTrack.GetTrackStatus() == fAlive) <<
284 aParticleChange.ProposeTrackStatus(fSusp <<
285 } <<
286 <<
287 //////////////////////////////////////////// <<
288 G4double Pmin = Rindex->Energy(0); <<
289 G4double Pmax = Rindex->GetMaxEnergy(); <<
290 G4double dp = Pmax - Pmin; <<
291 <<
292 G4double nMax = Rindex->GetMaxValue() <<
293 G4double BetaInverse = 1. / beta; <<
294 <<
295 G4double maxCos = BetaInverse / nMax; <<
296 G4double maxSin2 = (1.0 - maxCos) * (1.0 + m <<
297 <<
298 for(G4int i = 0; i < fNumPhotons; ++i) <<
299 { <<
300 // Determine photon energy <<
301 G4double rand; <<
302 G4double sampledEnergy, sampledRI; <<
303 G4double cosTheta, sin2Theta; <<
304 <<
305 // sample an energy <<
306 do <<
307 { <<
308 rand = G4UniformRand(); <<
309 sampledEnergy = Pmin + rand * dp; <<
310 sampledRI = Rindex->Value(sampledEne <<
311 cosTheta = BetaInverse / sampledRI; <<
312 <<
313 sin2Theta = (1.0 - cosTheta) * (1.0 + co <<
314 rand = G4UniformRand(); <<
315 <<
316 // Loop checking, 07-Aug-2015, Vladimir <<
317 } while(rand * maxSin2 > sin2Theta); <<
318 <<
319 // Create photon momentum direction vector <<
320 // with respect to the coordinate system w <<
321 // direction is aligned with the z axis <<
322 rand = G4UniformRand(); <<
323 G4double phi = twopi * rand; <<
324 G4double sinPhi = std::sin(phi); <<
325 G4double cosPhi = std::cos(phi); <<
326 G4double sinTheta = std::sqrt(sin2Theta); <<
327 G4ParticleMomentum photonMomentum(sinTheta <<
328 cosTheta <<
329 <<
330 // Rotate momentum direction back to globa <<
331 photonMomentum.rotateUz(p0); <<
332 <<
333 // Determine polarization of new photon <<
334 G4ThreeVector photonPolarization(cosTheta <<
335 -sinTheta <<
336 <<
337 // Rotate back to original coord system <<
338 photonPolarization.rotateUz(p0); <<
339 <<
340 // Generate a new photon: <<
341 auto aCerenkovPhoton = <<
342 new G4DynamicParticle(G4OpticalPhoton::O <<
343 <<
344 aCerenkovPhoton->SetPolarization(photonPol <<
345 aCerenkovPhoton->SetKineticEnergy(sampledE <<
346 <<
347 G4double NumberOfPhotons, N; <<
348 <<
349 do <<
350 { <<
351 rand = G4UniformRand(); <<
352 NumberOfPhotons = MeanNumberOfPhotons1 - <<
353 rand * (MeanNumberOfPh <<
354 N = <<
355 G4UniformRand() * std::max(MeanNumberO <<
356 // Loop checking, 07-Aug-2015, Vladimir <<
357 } while(N > NumberOfPhotons); <<
358 <<
359 G4double delta = rand * aStep.GetStepLengt <<
360 G4double deltaTime = <<
361 delta / <<
362 (pPreStepPoint->GetVelocity() + <<
363 rand * (pPostStepPoint->GetVelocity() - <<
364 0.5); <<
365 <<
366 G4double aSecondaryTime = t0 + de <<
367 G4ThreeVector aSecondaryPosition = x0 + ra <<
368 <<
369 // Generate new G4Track object: <<
370 G4Track* aSecondaryTrack = <<
371 new G4Track(aCerenkovPhoton, aSecondaryT <<
372 <<
373 aSecondaryTrack->SetTouchableHandle( <<
374 aStep.GetPreStepPoint()->GetTouchableHan <<
375 aSecondaryTrack->SetParentID(aTrack.GetTra <<
376 aSecondaryTrack->SetCreatorModelID(secID); <<
377 aParticleChange.AddSecondary(aSecondaryTra <<
378 } <<
379 <<
380 if(verboseLevel > 1) <<
381 { <<
382 G4cout << "\n Exiting from G4Cerenkov::DoI <<
383 << aParticleChange.GetNumberOfSecon <<
384 } <<
385 134
386 return pParticleChange; << 135 G4ThreeVector x0 = pPreStepPoint->GetPosition();
387 } << 136 G4ThreeVector p0 = aStep.GetDeltaPosition().unit();
>> 137 G4double t0 = pPreStepPoint->GetGlobalTime();
388 138
389 //....oooOO0OOooo........oooOO0OOooo........oo << 139 G4MaterialPropertiesTable* aMaterialPropertiesTable =
390 void G4Cerenkov::PreparePhysicsTable(const G4P << 140 aMaterial->GetMaterialPropertiesTable();
391 { << 141 if (!aMaterialPropertiesTable)
392 Initialise(); << 142 return G4VContinuousProcess::AlongStepDoIt(aTrack, aStep);
>> 143
>> 144 const G4MaterialPropertyVector* Rindex =
>> 145 aMaterialPropertiesTable->GetProperty("RINDEX");
>> 146 if (!Rindex)
>> 147 return G4VContinuousProcess::AlongStepDoIt(aTrack, aStep);
>> 148
>> 149 G4double MeanNumPhotons =
>> 150 GetAverageNumberOfPhotons(aParticle,aMaterial,Rindex);
>> 151
>> 152 if (MeanNumPhotons <= 0.0) {
>> 153
>> 154 // return unchanged particle and no secondaries
>> 155
>> 156 aParticleChange.SetNumberOfSecondaries(0);
>> 157
>> 158 return G4VContinuousProcess::AlongStepDoIt(aTrack, aStep);
>> 159
>> 160 }
>> 161
>> 162 G4double step_length;
>> 163 step_length = aStep.GetStepLength();
>> 164
>> 165 MeanNumPhotons = MeanNumPhotons * step_length;
>> 166
>> 167 G4int NumPhotons = (G4int) G4Poisson(MeanNumPhotons);
>> 168
>> 169 if (NumPhotons <= 0) {
>> 170
>> 171 // return unchanged particle and no secondaries
>> 172
>> 173 aParticleChange.SetNumberOfSecondaries(0);
>> 174
>> 175 return G4VContinuousProcess::AlongStepDoIt(aTrack, aStep);
>> 176 }
>> 177
>> 178 ////////////////////////////////////////////////////////////////
>> 179
>> 180 aParticleChange.SetNumberOfSecondaries(NumPhotons);
>> 181
>> 182 if (fTrackSecondariesFirst) {
>> 183 if (aTrack.GetTrackStatus() == fAlive )
>> 184 aParticleChange.SetStatusChange(fSuspend);
>> 185 }
>> 186
>> 187 ////////////////////////////////////////////////////////////////
>> 188
>> 189 G4double Pmin = Rindex->GetMinPhotonMomentum();
>> 190 G4double Pmax = Rindex->GetMaxPhotonMomentum();
>> 191 G4double dp = Pmax - Pmin;
>> 192
>> 193 G4double nMax = Rindex->GetMaxProperty();
>> 194
>> 195 G4double BetaInverse = aParticle->GetTotalEnergy() /
>> 196 aParticle->GetTotalMomentum();
>> 197
>> 198 G4double maxCos = BetaInverse / nMax;
>> 199 G4double maxSin2 = (1.0 - maxCos) * (1.0 + maxCos);
>> 200
>> 201 for (G4int i = 0; i < NumPhotons; i++) {
>> 202
>> 203 // Determine photon momentum
>> 204
>> 205 G4double rand;
>> 206 G4double sampledMomentum, sampledRI;
>> 207 G4double cosTheta, sin2Theta;
>> 208
>> 209 // sample a momentum
>> 210
>> 211 do {
>> 212 rand = G4UniformRand();
>> 213 sampledMomentum = Pmin + rand * dp;
>> 214 sampledRI = Rindex->GetProperty(sampledMomentum);
>> 215 cosTheta = BetaInverse / sampledRI;
>> 216
>> 217 sin2Theta = (1.0 - cosTheta)*(1.0 + cosTheta);
>> 218 rand = G4UniformRand();
>> 219
>> 220 } while (rand*maxSin2 > sin2Theta);
>> 221
>> 222 // Generate random position of photon on cone surface
>> 223 // defined by Theta
>> 224
>> 225 rand = G4UniformRand();
>> 226
>> 227 G4double phi = 2*M_PI*rand;
>> 228 G4double sinPhi = sin(phi);
>> 229 G4double cosPhi = cos(phi);
>> 230
>> 231 // calculate x,y, and z components of photon momentum
>> 232 // (in coord system with primary particle direction
>> 233 // aligned with the z axis)
>> 234
>> 235 G4double sinTheta = sqrt(sin2Theta);
>> 236 G4double px = sinTheta*cosPhi;
>> 237 G4double py = sinTheta*sinPhi;
>> 238 G4double pz = cosTheta;
>> 239
>> 240 // Create photon momentum direction vector
>> 241 // The momentum direction is still with respect
>> 242 // to the coordinate system where the primary
>> 243 // particle direction is aligned with the z axis
>> 244
>> 245 G4ParticleMomentum photonMomentum(px, py, pz);
>> 246
>> 247 // Rotate momentum direction back to global reference
>> 248 // system
>> 249
>> 250 photonMomentum.rotateUz(p0);
>> 251
>> 252 // Determine polarization of new photon
>> 253
>> 254 G4double sx = cosTheta*cosPhi;
>> 255 G4double sy = cosTheta*sinPhi;
>> 256 G4double sz = -sinTheta;
>> 257
>> 258 G4ThreeVector photonPolarization(sx, sy, sz);
>> 259
>> 260 // Rotate back to original coord system
>> 261
>> 262 photonPolarization.rotateUz(p0);
>> 263
>> 264 // Generate a new photon:
>> 265
>> 266 G4DynamicParticle* aCerenkovPhoton =
>> 267 new G4DynamicParticle(G4OpticalPhoton::OpticalPhoton(),
>> 268 photonMomentum);
>> 269 aCerenkovPhoton->SetPolarization
>> 270 (photonPolarization.x(),
>> 271 photonPolarization.y(),
>> 272 photonPolarization.z());
>> 273
>> 274 aCerenkovPhoton->SetKineticEnergy(sampledMomentum);
>> 275
>> 276 // Generate new G4Track object:
>> 277
>> 278 rand = G4UniformRand();
>> 279
>> 280 G4double delta = rand * aStep.GetStepLength();
>> 281 G4double deltaTime = delta /
>> 282 ((pPreStepPoint->GetVelocity()+
>> 283 pPostStepPoint->GetVelocity())/2.);
>> 284
>> 285 G4double aSecondaryTime = t0 + deltaTime;
>> 286
>> 287 G4ThreeVector aSecondaryPosition =
>> 288 x0 + rand * aStep.GetDeltaPosition();
>> 289
>> 290 G4Track* aSecondaryTrack =
>> 291 new G4Track(aCerenkovPhoton,aSecondaryTime,aSecondaryPosition);
>> 292
>> 293 aSecondaryTrack->SetTouchableHandle((G4VTouchable*)0);
>> 294
>> 295 aSecondaryTrack->SetParentID(aTrack.GetTrackID());
>> 296
>> 297 aParticleChange.AddSecondary(aSecondaryTrack);
>> 298 }
>> 299
>> 300 if (verboseLevel>0) {
>> 301 G4cout << "\n Exiting from G4Cerenkov::DoIt -- NumberOfSecondaries = "
>> 302 << aParticleChange.GetNumberOfSecondaries() << G4endl;
>> 303 }
>> 304
>> 305 return G4VContinuousProcess::AlongStepDoIt(aTrack, aStep);
393 } 306 }
394 307
395 //....oooOO0OOooo........oooOO0OOooo........oo << 308 // BuildThePhysicsTable for the Cerenkov process
396 G4double G4Cerenkov::GetMeanFreePath(const G4T << 309 // ---------------------------------------------
397 G4ForceCo << 310 //
>> 311
>> 312 void G4Cerenkov::BuildThePhysicsTable()
398 { 313 {
399 return 1.; << 314 if (thePhysicsTable) return;
>> 315
>> 316 const G4MaterialTable* theMaterialTable=
>> 317 G4Material::GetMaterialTable();
>> 318 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
>> 319
>> 320 // create new physics table
>> 321
>> 322 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 323
>> 324 // loop for materials
>> 325
>> 326 for (G4int i=0 ; i < numOfMaterials; i++)
>> 327 {
>> 328 G4PhysicsOrderedFreeVector* aPhysicsOrderedFreeVector =
>> 329 new G4PhysicsOrderedFreeVector();
>> 330
>> 331 // Retrieve vector of refraction indices for the material
>> 332 // from the material's optical properties table
>> 333
>> 334 G4Material* aMaterial = (*theMaterialTable)[i];
>> 335
>> 336 G4MaterialPropertiesTable* aMaterialPropertiesTable =
>> 337 aMaterial->GetMaterialPropertiesTable();
>> 338
>> 339 if (aMaterialPropertiesTable) {
>> 340
>> 341 G4MaterialPropertyVector* theRefractionIndexVector =
>> 342 aMaterialPropertiesTable->GetProperty("RINDEX");
>> 343
>> 344 if (theRefractionIndexVector) {
>> 345
>> 346 // Retrieve the first refraction index in vector
>> 347 // of (photon momentum, refraction index) pairs
>> 348
>> 349 theRefractionIndexVector->ResetIterator();
>> 350 ++(*theRefractionIndexVector); // advance to 1st entry
>> 351
>> 352 G4double currentRI = theRefractionIndexVector->
>> 353 GetProperty();
>> 354
>> 355 if (currentRI > 1.0) {
>> 356
>> 357 // Create first (photon momentum, Cerenkov Integral)
>> 358 // pair
>> 359
>> 360 G4double currentPM = theRefractionIndexVector->
>> 361 GetPhotonMomentum();
>> 362 G4double currentCAI = 0.0;
>> 363
>> 364 aPhysicsOrderedFreeVector->
>> 365 InsertValues(currentPM , currentCAI);
>> 366
>> 367 // Set previous values to current ones prior to loop
>> 368
>> 369 G4double prevPM = currentPM;
>> 370 G4double prevCAI = currentCAI;
>> 371 G4double prevRI = currentRI;
>> 372
>> 373 // loop over all (photon momentum, refraction index)
>> 374 // pairs stored for this material
>> 375
>> 376 while(++(*theRefractionIndexVector))
>> 377 {
>> 378 currentRI=theRefractionIndexVector->
>> 379 GetProperty();
>> 380
>> 381 currentPM = theRefractionIndexVector->
>> 382 GetPhotonMomentum();
>> 383
>> 384 currentCAI = 0.5*(1.0/(prevRI*prevRI) +
>> 385 1.0/(currentRI*currentRI));
>> 386
>> 387 currentCAI = prevCAI +
>> 388 (currentPM - prevPM) * currentCAI;
>> 389
>> 390 aPhysicsOrderedFreeVector->
>> 391 InsertValues(currentPM, currentCAI);
>> 392
>> 393 prevPM = currentPM;
>> 394 prevCAI = currentCAI;
>> 395 prevRI = currentRI;
>> 396 }
>> 397
>> 398 }
>> 399 }
>> 400 }
>> 401
>> 402 // The Cerenkov integral for a given material
>> 403 // will be inserted in thePhysicsTable
>> 404 // according to the position of the material in
>> 405 // the material table.
>> 406
>> 407 thePhysicsTable->insertAt(i,aPhysicsOrderedFreeVector);
>> 408
>> 409 }
400 } 410 }
401 411
402 //....oooOO0OOooo........oooOO0OOooo........oo << 412 // GetContinuousStepLimit
403 G4double G4Cerenkov::PostStepGetPhysicalIntera << 413 // ----------------------
404 const G4Track& aTrack, G4double, G4ForceCond << 414 //
>> 415
>> 416 G4double
>> 417 G4Cerenkov::GetContinuousStepLimit(const G4Track& aTrack,
>> 418 G4double ,
>> 419 G4double ,
>> 420 G4double& )
405 { 421 {
406 *condition = NotForced; << 422 // If user has defined an average maximum number of photons to
407 G4double StepLimit = DBL_MAX; << 423 // be generated in a Step, then return the Step length for that
408 fNumPhotons = 0; << 424 // number of photons.
409 << 425
410 const G4Material* aMaterial = aTrack.GetMate << 426 if (fMaxPhotons <= 0) return DBL_MAX;
411 std::size_t materialIndex = aMaterial->Get << 427
412 << 428 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
413 // If Physics Vector is not defined no Ceren << 429 const G4Material* aMaterial = aTrack.GetMaterial();
414 if(!(*thePhysicsTable)[materialIndex]) << 430
415 { << 431 G4MaterialPropertiesTable* aMaterialPropertiesTable =
416 return StepLimit; << 432 aMaterial->GetMaterialPropertiesTable();
417 } << 433 if (!aMaterialPropertiesTable) return DBL_MAX;
418 << 434
419 const G4DynamicParticle* aParticle = aTrack. << 435 const G4MaterialPropertyVector* Rindex =
420 const G4MaterialCutsCouple* couple = aTrack. << 436 aMaterialPropertiesTable->GetProperty("RINDEX");
421 << 437 if (!Rindex) return DBL_MAX;
422 G4double kineticEnergy = a << 438
423 const G4ParticleDefinition* particleType = a << 439 G4double MeanNumPhotons =
424 G4double mass = p << 440 GetAverageNumberOfPhotons(aParticle,aMaterial,Rindex);
425 << 441
426 G4double beta = aParticle->GetTotalMomentum << 442 if(MeanNumPhotons <= 0.0) return DBL_MAX;
427 G4double gamma = aParticle->GetTotalEnergy() << 443
428 << 444 G4double StepLimit = fMaxPhotons / MeanNumPhotons;
429 G4MaterialPropertiesTable* aMaterialProperti <<
430 aMaterial->GetMaterialPropertiesTable(); <<
431 <<
432 G4MaterialPropertyVector* Rindex = nullptr; <<
433 <<
434 if(aMaterialPropertiesTable) <<
435 Rindex = aMaterialPropertiesTable->GetProp <<
436 <<
437 G4double nMax; <<
438 if(Rindex) <<
439 { <<
440 nMax = Rindex->GetMaxValue(); <<
441 } <<
442 else <<
443 { <<
444 return StepLimit; <<
445 } <<
446 <<
447 G4double BetaMin = 1. / nMax; <<
448 if(BetaMin >= 1.) <<
449 return StepLimit; <<
450 <<
451 G4double GammaMin = 1. / std::sqrt(1. - Beta <<
452 if(gamma < GammaMin) <<
453 return StepLimit; <<
454 <<
455 G4double kinEmin = mass * (GammaMin - 1.); <<
456 G4double RangeMin = <<
457 G4LossTableManager::Instance()->GetRange(p <<
458 G4double Range = G4LossTableManager::Instanc <<
459 particleType, kineticEnergy, couple); <<
460 G4double Step = Range - RangeMin; <<
461 <<
462 // If the step is smaller than G4ThreeVector <<
463 // that the particle does not move. See bug <<
464 static const G4double minAllowedStep = G4Thr <<
465 if(Step < minAllowedStep) <<
466 return StepLimit; <<
467 <<
468 if(Step < StepLimit) <<
469 StepLimit = Step; <<
470 <<
471 // If user has defined an average maximum nu <<
472 // a Step, then calculate the Step length fo <<
473 if(fMaxPhotons > 0) <<
474 { <<
475 const G4double charge = aParticle->GetDefi <<
476 G4double MeanNumberOfPhotons = <<
477 GetAverageNumberOfPhotons(charge, beta, <<
478 Step = 0.; <<
479 if(MeanNumberOfPhotons > 0.0) <<
480 Step = fMaxPhotons / MeanNumberOfPhotons <<
481 if(Step > 0. && Step < StepLimit) <<
482 StepLimit = Step; <<
483 } <<
484 <<
485 // If user has defined an maximum allowed ch <<
486 if(fMaxBetaChange > 0.) <<
487 { <<
488 G4double dedx = G4LossTableManager::Instan <<
489 particleType, kineticEnergy, couple); <<
490 G4double deltaGamma = <<
491 gamma - 1. / std::sqrt(1. - beta * beta <<
492 (1. - fMax <<
493 <<
494 Step = mass * deltaGamma / dedx; <<
495 if(Step > 0. && Step < StepLimit) <<
496 StepLimit = Step; <<
497 } <<
498 445
499 *condition = StronglyForced; << 446 return StepLimit;
500 return StepLimit; <<
501 } 447 }
502 448
503 //....oooOO0OOooo........oooOO0OOooo........oo << 449 // GetAverageNumberOfPhotons
504 G4double G4Cerenkov::GetAverageNumberOfPhotons << 450 // -------------------------
505 const G4double charge, const G4double beta, <<
506 G4MaterialPropertyVector* Rindex) const <<
507 // This routine computes the number of Cerenko 451 // This routine computes the number of Cerenkov photons produced per
508 // Geant4-unit (millimeter) in the current med << 452 // GEANT-unit (millimeter) in the current medium.
>> 453 // ^^^^^^^^^^
>> 454
>> 455 G4double
>> 456 G4Cerenkov::GetAverageNumberOfPhotons(const G4DynamicParticle* aParticle,
>> 457 const G4Material* aMaterial,
>> 458 const G4MaterialPropertyVector* Rindex) const
509 { 459 {
510 constexpr G4double Rfact = 369.81 / (eV * cm << 460 const G4double Rfact = 369.81/(eV * cm);
511 if(beta <= 0.0) <<
512 return 0.0; <<
513 G4double BetaInverse = 1. / beta; <<
514 <<
515 // Vectors used in computation of Cerenkov A <<
516 // - Refraction Indices for the current mat <<
517 // - new G4PhysicsFreeVector allocated to h <<
518 std::size_t materialIndex = aMaterial->GetIn <<
519 <<
520 // Retrieve the Cerenkov Angle Integrals for <<
521 G4PhysicsVector* CerenkovAngleIntegrals = (( <<
522 <<
523 std::size_t length = CerenkovAngleIntegrals- <<
524 if(0 == length) <<
525 return 0.0; <<
526 <<
527 // Min and Max photon energies <<
528 G4double Pmin = Rindex->Energy(0); <<
529 G4double Pmax = Rindex->GetMaxEnergy(); <<
530 <<
531 // Min and Max Refraction Indices <<
532 G4double nMin = Rindex->GetMinValue(); <<
533 G4double nMax = Rindex->GetMaxValue(); <<
534 <<
535 // Max Cerenkov Angle Integral <<
536 G4double CAImax = (*CerenkovAngleIntegrals)[ <<
537 <<
538 G4double dp, ge; <<
539 // If n(Pmax) < 1/Beta -- no photons generat <<
540 if(nMax < BetaInverse) <<
541 { <<
542 dp = 0.0; <<
543 ge = 0.0; <<
544 } <<
545 // otherwise if n(Pmin) >= 1/Beta -- photons <<
546 else if(nMin > BetaInverse) <<
547 { <<
548 dp = Pmax - Pmin; <<
549 ge = CAImax; <<
550 } <<
551 // If n(Pmin) < 1/Beta, and n(Pmax) >= 1/Bet <<
552 // that the value of n(P) == 1/Beta. Interpo <<
553 // GetEnergy() and Value() methods of the G4 <<
554 // the Value() method of G4PhysicsVector. <<
555 else <<
556 { <<
557 Pmin = Rindex->GetEnergy(BetaInverse); <<
558 dp = Pmax - Pmin; <<
559 <<
560 G4double CAImin = CerenkovAngleIntegrals-> <<
561 ge = CAImax - CAImin; <<
562 <<
563 if(verboseLevel > 1) <<
564 { <<
565 G4cout << "CAImin = " << CAImin << G4end <<
566 } <<
567 } <<
568 <<
569 // Calculate number of photons <<
570 G4double NumPhotons = Rfact * charge / eplus <<
571 (dp - ge * BetaInverse <<
572 461
573 return NumPhotons; << 462 if(aParticle->GetTotalMomentum() <= 0.0)return 0.0;
574 } <<
575 463
576 //....oooOO0OOooo........oooOO0OOooo........oo << 464 G4double BetaInverse = aParticle->GetTotalEnergy() /
577 void G4Cerenkov::SetTrackSecondariesFirst(cons << 465 aParticle->GetTotalMomentum();
578 { <<
579 fTrackSecondariesFirst = state; <<
580 G4OpticalParameters::Instance()->SetCerenkov <<
581 fTrackSecondariesFirst); <<
582 } <<
583 466
584 //....oooOO0OOooo........oooOO0OOooo........oo << 467 // Vectors used in computation of Cerenkov Angle Integral:
585 void G4Cerenkov::SetMaxBetaChangePerStep(const << 468 // - Refraction Indices for the current material
586 { << 469 // - new G4PhysicsOrderedFreeVector allocated to hold CAI's
587 fMaxBetaChange = value * CLHEP::perCent; << 470
588 G4OpticalParameters::Instance()->SetCerenkov << 471 G4int materialIndex = aMaterial->GetIndex();
589 } <<
590 472
591 //....oooOO0OOooo........oooOO0OOooo........oo << 473 // Retrieve the Cerenkov Angle Integrals for this material
592 void G4Cerenkov::SetMaxNumPhotonsPerStep(const <<
593 { <<
594 fMaxPhotons = NumPhotons; <<
595 G4OpticalParameters::Instance()->SetCerenkov <<
596 } <<
597 474
598 void G4Cerenkov::SetStackPhotons(const G4bool << 475 G4PhysicsOrderedFreeVector* CerenkovAngleIntegrals =
599 { << 476 (G4PhysicsOrderedFreeVector*)((*thePhysicsTable)(materialIndex));
600 fStackingFlag = stackingFlag; <<
601 G4OpticalParameters::Instance()->SetCerenkov <<
602 } <<
603 477
604 //....oooOO0OOooo........oooOO0OOooo........oo << 478 if(!(CerenkovAngleIntegrals->IsFilledVectorExist()))return 0.0;
605 void G4Cerenkov::DumpPhysicsTable() const <<
606 { <<
607 G4cout << "Dump Physics Table!" << G4endl; <<
608 for(std::size_t i = 0; i < thePhysicsTable-> <<
609 { <<
610 (*thePhysicsTable)[i]->DumpValues(); <<
611 } <<
612 } <<
613 479
614 //....oooOO0OOooo........oooOO0OOooo........oo << 480 // Min and Max photon momenta
615 void G4Cerenkov::SetVerboseLevel(G4int verbose << 481 G4double Pmin = Rindex->GetMinPhotonMomentum();
616 { << 482 G4double Pmax = Rindex->GetMaxPhotonMomentum();
617 verboseLevel = verbose; << 483
618 G4OpticalParameters::Instance()->SetCerenkov << 484 // Min and Max Refraction Indices
>> 485 G4double nMin = Rindex->GetMinProperty();
>> 486 G4double nMax = Rindex->GetMaxProperty();
>> 487
>> 488 // Max Cerenkov Angle Integral
>> 489 G4double CAImax = CerenkovAngleIntegrals->GetMaxValue();
>> 490
>> 491 G4double dp, ge;
>> 492
>> 493 // If n(Pmax) < 1/Beta -- no photons generated
>> 494
>> 495 if (nMax < BetaInverse) {
>> 496 dp = 0;
>> 497 ge = 0;
>> 498 }
>> 499
>> 500 // otherwise if n(Pmin) >= 1/Beta -- photons generated
>> 501
>> 502 else if (nMin > BetaInverse) {
>> 503 dp = Pmax - Pmin;
>> 504 ge = CAImax;
>> 505 }
>> 506
>> 507 // If n(Pmin) < 1/Beta, and n(Pmax) >= 1/Beta, then
>> 508 // we need to find a P such that the value of n(P) == 1/Beta.
>> 509 // Interpolation is performed by the GetPhotonMomentum() and
>> 510 // GetProperty() methods of the G4MaterialPropertiesTable and
>> 511 // the GetValue() method of G4PhysicsVector.
>> 512
>> 513 else {
>> 514 Pmin = Rindex->GetPhotonMomentum(BetaInverse);
>> 515 dp = Pmax - Pmin;
>> 516
>> 517 // need boolean for current implementation of G4PhysicsVector
>> 518 // ==> being phased out
>> 519 G4bool isOutRange;
>> 520 G4double CAImin = CerenkovAngleIntegrals->
>> 521 GetValue(Pmin, isOutRange);
>> 522 ge = CAImax - CAImin;
>> 523
>> 524 if (verboseLevel>0) {
>> 525 G4cout << "CAImin = " << CAImin << G4endl;
>> 526 G4cout << "ge = " << ge << G4endl;
>> 527 }
>> 528 }
>> 529
>> 530 // particle charge
>> 531 G4double charge = aParticle->GetDefinition()->GetPDGCharge();
>> 532
>> 533 // Calculate number of photons
>> 534 G4double NumPhotons = Rfact * charge/eplus * charge/eplus *
>> 535 (dp - ge * BetaInverse*BetaInverse);
>> 536
>> 537 return NumPhotons;
619 } 538 }
620 539