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25 // 25 //
>> 26 //
>> 27 // $Id: G4Cerenkov.cc,v 1.23 2007/10/15 20:05:23 gum Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01-patch-01 $
>> 29 //
26 ////////////////////////////////////////////// 30 ////////////////////////////////////////////////////////////////////////
27 // Cerenkov Radiation Class Implementation 31 // Cerenkov Radiation Class Implementation
28 ////////////////////////////////////////////// 32 ////////////////////////////////////////////////////////////////////////
29 // 33 //
30 // File: G4Cerenkov.cc << 34 // File: G4Cerenkov.cc
31 // Description: Discrete Process -- Generation 35 // Description: Discrete Process -- Generation of Cerenkov Photons
32 // Version: 2.1 36 // Version: 2.1
33 // Created: 1996-02-21 << 37 // Created: 1996-02-21
34 // Author: Juliet Armstrong 38 // Author: Juliet Armstrong
35 // Updated: 2007-09-30 by Peter Gumplinger 39 // Updated: 2007-09-30 by Peter Gumplinger
36 // > change inheritance to G4VDis 40 // > change inheritance to G4VDiscreteProcess
37 // GetContinuousStepLimit -> GetM 41 // GetContinuousStepLimit -> GetMeanFreePath (StronglyForced)
38 // AlongStepDoIt -> PostStepDoIt 42 // AlongStepDoIt -> PostStepDoIt
39 // 2005-08-17 by Peter Gumplinger 43 // 2005-08-17 by Peter Gumplinger
40 // > change variable name MeanNum 44 // > change variable name MeanNumPhotons -> MeanNumberOfPhotons
41 // 2005-07-28 by Peter Gumplinger 45 // 2005-07-28 by Peter Gumplinger
42 // > add G4ProcessType to constru 46 // > add G4ProcessType to constructor
43 // 2001-09-17, migration of Mater << 47 // 2001-09-17, migration of Materials to pure STL (mma)
44 // 2000-11-12 by Peter Gumplinger 48 // 2000-11-12 by Peter Gumplinger
45 // > add check on CerenkovAngleIn 49 // > add check on CerenkovAngleIntegrals->IsFilledVectorExist()
46 // in method GetAverageNumberOfPh << 50 // in method GetAverageNumberOfPhotons
47 // > and a test for MeanNumberOfP 51 // > and a test for MeanNumberOfPhotons <= 0.0 in DoIt
48 // 2000-09-18 by Peter Gumplinger 52 // 2000-09-18 by Peter Gumplinger
49 // > change: aSecondaryPosition=x 53 // > change: aSecondaryPosition=x0+rand*aStep.GetDeltaPosition();
50 // aSecondaryTrack->Set 54 // aSecondaryTrack->SetTouchable(0);
51 // 1999-10-29 by Peter Gumplinger 55 // 1999-10-29 by Peter Gumplinger
52 // > change: == into <= in GetCon 56 // > change: == into <= in GetContinuousStepLimit
53 // 1997-08-08 by Peter Gumplinger 57 // 1997-08-08 by Peter Gumplinger
54 // > add protection against /0 58 // > add protection against /0
55 // > G4MaterialPropertiesTable; n 59 // > G4MaterialPropertiesTable; new physics/tracking scheme
56 // 60 //
>> 61 // mail: gum@triumf.ca
>> 62 //
57 ////////////////////////////////////////////// 63 ////////////////////////////////////////////////////////////////////////
58 64
59 #include "G4Cerenkov.hh" <<
60 <<
61 #include "G4ios.hh" 65 #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" 66 #include "G4Poisson.hh"
73 #include "G4SystemOfUnits.hh" << 67 #include "G4Cerenkov.hh"
74 #include "G4ThreeVector.hh" << 68
75 #include "Randomize.hh" << 69 using namespace std;
76 #include "G4PhysicsModelCatalog.hh" << 70
>> 71 /////////////////////////
>> 72 // Class Implementation
>> 73 /////////////////////////
>> 74
>> 75 //////////////
>> 76 // Operators
>> 77 //////////////
>> 78
>> 79 // G4Cerenkov::operator=(const G4Cerenkov &right)
>> 80 // {
>> 81 // }
>> 82
>> 83 /////////////////
>> 84 // Constructors
>> 85 /////////////////
77 86
78 //....oooOO0OOooo........oooOO0OOooo........oo <<
79 G4Cerenkov::G4Cerenkov(const G4String& process 87 G4Cerenkov::G4Cerenkov(const G4String& processName, G4ProcessType type)
80 : G4VProcess(processName, type) << 88 : G4VDiscreteProcess(processName, type)
81 , fNumPhotons(0) <<
82 { 89 {
83 secID = G4PhysicsModelCatalog::GetModelID("m << 90 G4cout << "G4Cerenkov::G4Cerenkov constructor" << G4endl;
84 SetProcessSubType(fCerenkov); << 91 G4cout << "NOTE: this is now a G4VDiscreteProcess!" << G4endl;
>> 92 G4cout << "Required change in UserPhysicsList: " << G4endl;
>> 93 G4cout << "change: pmanager->AddContinuousProcess(theCerenkovProcess);" << G4endl;
>> 94 G4cout << "to: pmanager->AddProcess(theCerenkovProcess);" << G4endl;
>> 95 G4cout << " pmanager->SetProcessOrdering(theCerenkovProcess,idxPostStep);" << G4endl;
85 96
86 thePhysicsTable = nullptr; << 97 fTrackSecondariesFirst = false;
>> 98 fMaxPhotons = 0;
87 99
88 if(verboseLevel > 0) << 100 thePhysicsTable = NULL;
89 { <<
90 G4cout << GetProcessName() << " is created <<
91 } <<
92 Initialise(); <<
93 } <<
94 101
95 //....oooOO0OOooo........oooOO0OOooo........oo << 102 if (verboseLevel>0) {
96 G4Cerenkov::~G4Cerenkov() << 103 G4cout << GetProcessName() << " is created " << G4endl;
97 { << 104 }
98 if(thePhysicsTable != nullptr) <<
99 { <<
100 thePhysicsTable->clearAndDestroy(); <<
101 delete thePhysicsTable; <<
102 } <<
103 } <<
104 105
105 void G4Cerenkov::ProcessDescription(std::ostre << 106 BuildThePhysicsTable();
106 { <<
107 out << "The Cerenkov effect simulates optica <<
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 } 107 }
120 108
121 //....oooOO0OOooo........oooOO0OOooo........oo << 109 // G4Cerenkov::G4Cerenkov(const G4Cerenkov &right)
122 G4bool G4Cerenkov::IsApplicable(const G4Partic << 110 // {
123 { << 111 // }
124 return (aParticleType.GetPDGCharge() != 0.0 << 112
125 aParticleType.GetPDGMass() != 0.0 && << 113 ////////////////
126 aParticleType.GetParticleName() != " << 114 // Destructors
127 !aParticleType.IsShortLived()) << 115 ////////////////
128 ? true <<
129 : false; <<
130 } <<
131 116
132 //....oooOO0OOooo........oooOO0OOooo........oo << 117 G4Cerenkov::~G4Cerenkov()
133 void G4Cerenkov::Initialise() <<
134 { 118 {
135 G4OpticalParameters* params = G4OpticalParam << 119 if (thePhysicsTable != NULL) {
136 SetMaxBetaChangePerStep(params->GetCerenkovM << 120 thePhysicsTable->clearAndDestroy();
137 SetMaxNumPhotonsPerStep(params->GetCerenkovM << 121 delete thePhysicsTable;
138 SetTrackSecondariesFirst(params->GetCerenkov << 122 }
139 SetStackPhotons(params->GetCerenkovStackPhot <<
140 SetVerboseLevel(params->GetCerenkovVerboseLe <<
141 } 123 }
142 124
143 //....oooOO0OOooo........oooOO0OOooo........oo << 125 ////////////
144 void G4Cerenkov::BuildPhysicsTable(const G4Par << 126 // Methods
>> 127 ////////////
>> 128
>> 129 // PostStepDoIt
>> 130 // -------------
>> 131 //
>> 132 G4VParticleChange*
>> 133 G4Cerenkov::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
>> 134
>> 135 // This routine is called for each tracking Step of a charged particle
>> 136 // in a radiator. A Poisson-distributed number of photons is generated
>> 137 // according to the Cerenkov formula, distributed evenly along the track
>> 138 // segment and uniformly azimuth w.r.t. the particle direction. The
>> 139 // parameters are then transformed into the Master Reference System, and
>> 140 // they are added to the particle change.
>> 141
145 { 142 {
146 if(thePhysicsTable) <<
147 return; <<
148 143
149 const G4MaterialTable* theMaterialTable = G4 << 144 //////////////////////////////////////////////////////
150 std::size_t numOfMaterials = G4 << 145 // Should we ensure that the material is dispersive?
>> 146 //////////////////////////////////////////////////////
>> 147
>> 148 aParticleChange.Initialize(aTrack);
>> 149
>> 150 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
>> 151 const G4Material* aMaterial = aTrack.GetMaterial();
>> 152
>> 153 G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint();
>> 154 G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint();
>> 155
>> 156 G4ThreeVector x0 = pPreStepPoint->GetPosition();
>> 157 G4ThreeVector p0 = aStep.GetDeltaPosition().unit();
>> 158 G4double t0 = pPreStepPoint->GetGlobalTime();
>> 159
>> 160 G4MaterialPropertiesTable* aMaterialPropertiesTable =
>> 161 aMaterial->GetMaterialPropertiesTable();
>> 162 if (!aMaterialPropertiesTable)
>> 163 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
>> 164
>> 165 const G4MaterialPropertyVector* Rindex =
>> 166 aMaterialPropertiesTable->GetProperty("RINDEX");
>> 167 if (!Rindex)
>> 168 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
151 169
152 thePhysicsTable = new G4PhysicsTable(numOfMa << 170 // particle charge
>> 171 const G4double charge = aParticle->GetDefinition()->GetPDGCharge();
>> 172
>> 173 // particle beta
>> 174 const G4double beta = (pPreStepPoint ->GetBeta() +
>> 175 pPostStepPoint->GetBeta())/2.;
>> 176
>> 177 G4double MeanNumberOfPhotons =
>> 178 GetAverageNumberOfPhotons(charge,beta,aMaterial,Rindex);
>> 179
>> 180 if (MeanNumberOfPhotons <= 0.0) {
>> 181
>> 182 // return unchanged particle and no secondaries
>> 183
>> 184 aParticleChange.SetNumberOfSecondaries(0);
>> 185
>> 186 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
153 187
154 // loop over materials <<
155 for(std::size_t i = 0; i < numOfMaterials; + <<
156 { <<
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 } 188 }
204 } <<
205 } <<
206 189
207 // The Cerenkov integral for a given mater << 190 G4double step_length;
208 // thePhysicsTable according to the positi << 191 step_length = aStep.GetStepLength();
209 // the material table. <<
210 thePhysicsTable->insertAt(i, cerenkovInteg <<
211 } <<
212 } <<
213 192
214 //....oooOO0OOooo........oooOO0OOooo........oo << 193 MeanNumberOfPhotons = MeanNumberOfPhotons * step_length;
215 G4VParticleChange* G4Cerenkov::PostStepDoIt(co <<
216 co <<
217 // This routine is called for each tracking St <<
218 // in a radiator. A Poisson-distributed number <<
219 // according to the Cerenkov formula, distribu <<
220 // segment and uniformly azimuth w.r.t. the pa <<
221 // parameters are then transformed into the Ma <<
222 // they are added to the particle change. <<
223 194
224 { << 195 G4int NumPhotons = (G4int) G4Poisson(MeanNumberOfPhotons);
225 aParticleChange.Initialize(aTrack); <<
226 196
227 const G4DynamicParticle* aParticle = aTrack. << 197 if (NumPhotons <= 0) {
228 const G4Material* aMaterial = aTrack. <<
229 198
230 G4StepPoint* pPreStepPoint = aStep.GetPreSt << 199 // return unchanged particle and no secondaries
231 G4StepPoint* pPostStepPoint = aStep.GetPostS <<
232 200
233 G4ThreeVector x0 = pPreStepPoint->GetPositio << 201 aParticleChange.SetNumberOfSecondaries(0);
234 G4ThreeVector p0 = aStep.GetDeltaPosition(). << 202
235 G4double t0 = pPreStepPoint->GetGlobalT << 203 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
236 << 204 }
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 } <<
385 205
386 return pParticleChange; << 206 ////////////////////////////////////////////////////////////////
387 } <<
388 207
389 //....oooOO0OOooo........oooOO0OOooo........oo << 208 aParticleChange.SetNumberOfSecondaries(NumPhotons);
390 void G4Cerenkov::PreparePhysicsTable(const G4P << 209
391 { << 210 if (fTrackSecondariesFirst) {
392 Initialise(); << 211 if (aTrack.GetTrackStatus() == fAlive )
>> 212 aParticleChange.ProposeTrackStatus(fSuspend);
>> 213 }
>> 214
>> 215 ////////////////////////////////////////////////////////////////
>> 216
>> 217 G4double Pmin = Rindex->GetMinPhotonMomentum();
>> 218 G4double Pmax = Rindex->GetMaxPhotonMomentum();
>> 219 G4double dp = Pmax - Pmin;
>> 220
>> 221 G4double nMax = Rindex->GetMaxProperty();
>> 222
>> 223 G4double BetaInverse = 1./beta;
>> 224
>> 225 G4double maxCos = BetaInverse / nMax;
>> 226 G4double maxSin2 = (1.0 - maxCos) * (1.0 + maxCos);
>> 227
>> 228 for (G4int i = 0; i < NumPhotons; i++) {
>> 229
>> 230 // Determine photon momentum
>> 231
>> 232 G4double rand;
>> 233 G4double sampledMomentum, sampledRI;
>> 234 G4double cosTheta, sin2Theta;
>> 235
>> 236 // sample a momentum
>> 237
>> 238 do {
>> 239 rand = G4UniformRand();
>> 240 sampledMomentum = Pmin + rand * dp;
>> 241 sampledRI = Rindex->GetProperty(sampledMomentum);
>> 242 cosTheta = BetaInverse / sampledRI;
>> 243
>> 244 sin2Theta = (1.0 - cosTheta)*(1.0 + cosTheta);
>> 245 rand = G4UniformRand();
>> 246
>> 247 } while (rand*maxSin2 > sin2Theta);
>> 248
>> 249 // Generate random position of photon on cone surface
>> 250 // defined by Theta
>> 251
>> 252 rand = G4UniformRand();
>> 253
>> 254 G4double phi = twopi*rand;
>> 255 G4double sinPhi = sin(phi);
>> 256 G4double cosPhi = cos(phi);
>> 257
>> 258 // calculate x,y, and z components of photon momentum
>> 259 // (in coord system with primary particle direction
>> 260 // aligned with the z axis)
>> 261
>> 262 G4double sinTheta = sqrt(sin2Theta);
>> 263 G4double px = sinTheta*cosPhi;
>> 264 G4double py = sinTheta*sinPhi;
>> 265 G4double pz = cosTheta;
>> 266
>> 267 // Create photon momentum direction vector
>> 268 // The momentum direction is still with respect
>> 269 // to the coordinate system where the primary
>> 270 // particle direction is aligned with the z axis
>> 271
>> 272 G4ParticleMomentum photonMomentum(px, py, pz);
>> 273
>> 274 // Rotate momentum direction back to global reference
>> 275 // system
>> 276
>> 277 photonMomentum.rotateUz(p0);
>> 278
>> 279 // Determine polarization of new photon
>> 280
>> 281 G4double sx = cosTheta*cosPhi;
>> 282 G4double sy = cosTheta*sinPhi;
>> 283 G4double sz = -sinTheta;
>> 284
>> 285 G4ThreeVector photonPolarization(sx, sy, sz);
>> 286
>> 287 // Rotate back to original coord system
>> 288
>> 289 photonPolarization.rotateUz(p0);
>> 290
>> 291 // Generate a new photon:
>> 292
>> 293 G4DynamicParticle* aCerenkovPhoton =
>> 294 new G4DynamicParticle(G4OpticalPhoton::OpticalPhoton(),
>> 295 photonMomentum);
>> 296 aCerenkovPhoton->SetPolarization
>> 297 (photonPolarization.x(),
>> 298 photonPolarization.y(),
>> 299 photonPolarization.z());
>> 300
>> 301 aCerenkovPhoton->SetKineticEnergy(sampledMomentum);
>> 302
>> 303 // Generate new G4Track object:
>> 304
>> 305 rand = G4UniformRand();
>> 306
>> 307 G4double delta = rand * aStep.GetStepLength();
>> 308 G4double deltaTime = delta /
>> 309 ((pPreStepPoint->GetVelocity()+
>> 310 pPostStepPoint->GetVelocity())/2.);
>> 311
>> 312 G4double aSecondaryTime = t0 + deltaTime;
>> 313
>> 314 G4ThreeVector aSecondaryPosition =
>> 315 x0 + rand * aStep.GetDeltaPosition();
>> 316
>> 317 G4Track* aSecondaryTrack =
>> 318 new G4Track(aCerenkovPhoton,aSecondaryTime,aSecondaryPosition);
>> 319
>> 320 aSecondaryTrack->SetTouchableHandle((G4VTouchable*)0);
>> 321
>> 322 aSecondaryTrack->SetParentID(aTrack.GetTrackID());
>> 323
>> 324 aParticleChange.AddSecondary(aSecondaryTrack);
>> 325 }
>> 326
>> 327 if (verboseLevel>0) {
>> 328 G4cout << "\n Exiting from G4Cerenkov::DoIt -- NumberOfSecondaries = "
>> 329 << aParticleChange.GetNumberOfSecondaries() << G4endl;
>> 330 }
>> 331
>> 332 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
393 } 333 }
394 334
395 //....oooOO0OOooo........oooOO0OOooo........oo << 335 // BuildThePhysicsTable for the Cerenkov process
396 G4double G4Cerenkov::GetMeanFreePath(const G4T << 336 // ---------------------------------------------
397 G4ForceCo << 337 //
>> 338
>> 339 void G4Cerenkov::BuildThePhysicsTable()
398 { 340 {
399 return 1.; << 341 if (thePhysicsTable) return;
>> 342
>> 343 const G4MaterialTable* theMaterialTable=
>> 344 G4Material::GetMaterialTable();
>> 345 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
>> 346
>> 347 // create new physics table
>> 348
>> 349 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 350
>> 351 // loop for materials
>> 352
>> 353 for (G4int i=0 ; i < numOfMaterials; i++)
>> 354 {
>> 355 G4PhysicsOrderedFreeVector* aPhysicsOrderedFreeVector =
>> 356 new G4PhysicsOrderedFreeVector();
>> 357
>> 358 // Retrieve vector of refraction indices for the material
>> 359 // from the material's optical properties table
>> 360
>> 361 G4Material* aMaterial = (*theMaterialTable)[i];
>> 362
>> 363 G4MaterialPropertiesTable* aMaterialPropertiesTable =
>> 364 aMaterial->GetMaterialPropertiesTable();
>> 365
>> 366 if (aMaterialPropertiesTable) {
>> 367
>> 368 G4MaterialPropertyVector* theRefractionIndexVector =
>> 369 aMaterialPropertiesTable->GetProperty("RINDEX");
>> 370
>> 371 if (theRefractionIndexVector) {
>> 372
>> 373 // Retrieve the first refraction index in vector
>> 374 // of (photon momentum, refraction index) pairs
>> 375
>> 376 theRefractionIndexVector->ResetIterator();
>> 377 ++(*theRefractionIndexVector); // advance to 1st entry
>> 378
>> 379 G4double currentRI = theRefractionIndexVector->
>> 380 GetProperty();
>> 381
>> 382 if (currentRI > 1.0) {
>> 383
>> 384 // Create first (photon momentum, Cerenkov Integral)
>> 385 // pair
>> 386
>> 387 G4double currentPM = theRefractionIndexVector->
>> 388 GetPhotonMomentum();
>> 389 G4double currentCAI = 0.0;
>> 390
>> 391 aPhysicsOrderedFreeVector->
>> 392 InsertValues(currentPM , currentCAI);
>> 393
>> 394 // Set previous values to current ones prior to loop
>> 395
>> 396 G4double prevPM = currentPM;
>> 397 G4double prevCAI = currentCAI;
>> 398 G4double prevRI = currentRI;
>> 399
>> 400 // loop over all (photon momentum, refraction index)
>> 401 // pairs stored for this material
>> 402
>> 403 while(++(*theRefractionIndexVector))
>> 404 {
>> 405 currentRI=theRefractionIndexVector->
>> 406 GetProperty();
>> 407
>> 408 currentPM = theRefractionIndexVector->
>> 409 GetPhotonMomentum();
>> 410
>> 411 currentCAI = 0.5*(1.0/(prevRI*prevRI) +
>> 412 1.0/(currentRI*currentRI));
>> 413
>> 414 currentCAI = prevCAI +
>> 415 (currentPM - prevPM) * currentCAI;
>> 416
>> 417 aPhysicsOrderedFreeVector->
>> 418 InsertValues(currentPM, currentCAI);
>> 419
>> 420 prevPM = currentPM;
>> 421 prevCAI = currentCAI;
>> 422 prevRI = currentRI;
>> 423 }
>> 424
>> 425 }
>> 426 }
>> 427 }
>> 428
>> 429 // The Cerenkov integral for a given material
>> 430 // will be inserted in thePhysicsTable
>> 431 // according to the position of the material in
>> 432 // the material table.
>> 433
>> 434 thePhysicsTable->insertAt(i,aPhysicsOrderedFreeVector);
>> 435
>> 436 }
400 } 437 }
401 438
402 //....oooOO0OOooo........oooOO0OOooo........oo << 439 // GetMeanFreePath
403 G4double G4Cerenkov::PostStepGetPhysicalIntera << 440 // ---------------
404 const G4Track& aTrack, G4double, G4ForceCond << 441 //
>> 442
>> 443 G4double G4Cerenkov::GetMeanFreePath(const G4Track& aTrack,
>> 444 G4double,
>> 445 G4ForceCondition* condition)
405 { 446 {
406 *condition = NotForced; << 447 *condition = StronglyForced;
407 G4double StepLimit = DBL_MAX; << 448
408 fNumPhotons = 0; << 449 // If user has defined an average maximum number of photons to
409 << 450 // be generated in a Step, then return the Step length for that
410 const G4Material* aMaterial = aTrack.GetMate << 451 // number of photons.
411 std::size_t materialIndex = aMaterial->Get << 452
412 << 453 if (fMaxPhotons <= 0) return DBL_MAX;
413 // If Physics Vector is not defined no Ceren << 454
414 if(!(*thePhysicsTable)[materialIndex]) << 455 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
415 { << 456 const G4Material* aMaterial = aTrack.GetMaterial();
416 return StepLimit; << 457
417 } << 458 G4MaterialPropertiesTable* aMaterialPropertiesTable =
418 << 459 aMaterial->GetMaterialPropertiesTable();
419 const G4DynamicParticle* aParticle = aTrack. << 460 if (!aMaterialPropertiesTable) return DBL_MAX;
420 const G4MaterialCutsCouple* couple = aTrack. << 461
421 << 462 const G4MaterialPropertyVector* Rindex =
422 G4double kineticEnergy = a << 463 aMaterialPropertiesTable->GetProperty("RINDEX");
423 const G4ParticleDefinition* particleType = a << 464 if (!Rindex) return DBL_MAX;
424 G4double mass = p << 465
425 << 466 // particle charge
426 G4double beta = aParticle->GetTotalMomentum << 467 const G4double charge = aParticle->GetDefinition()->GetPDGCharge();
427 G4double gamma = aParticle->GetTotalEnergy() << 468
428 << 469 // particle beta
429 G4MaterialPropertiesTable* aMaterialProperti << 470 const G4double beta = aParticle->GetTotalMomentum() /
430 aMaterial->GetMaterialPropertiesTable(); << 471 aParticle->GetTotalEnergy();
431 << 472
432 G4MaterialPropertyVector* Rindex = nullptr; << 473 G4double MeanNumberOfPhotons =
433 << 474 GetAverageNumberOfPhotons(charge,beta,aMaterial,Rindex);
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 } <<
498 475
499 *condition = StronglyForced; << 476 if(MeanNumberOfPhotons <= 0.0) return DBL_MAX;
500 return StepLimit; << 477
>> 478 G4double StepLimit = fMaxPhotons / MeanNumberOfPhotons;
>> 479
>> 480 return StepLimit;
501 } 481 }
502 482
503 //....oooOO0OOooo........oooOO0OOooo........oo << 483 // GetAverageNumberOfPhotons
504 G4double G4Cerenkov::GetAverageNumberOfPhotons << 484 // -------------------------
505 const G4double charge, const G4double beta, <<
506 G4MaterialPropertyVector* Rindex) const <<
507 // This routine computes the number of Cerenko 485 // This routine computes the number of Cerenkov photons produced per
508 // Geant4-unit (millimeter) in the current med << 486 // GEANT-unit (millimeter) in the current medium.
>> 487 // ^^^^^^^^^^
>> 488
>> 489 G4double
>> 490 G4Cerenkov::GetAverageNumberOfPhotons(const G4double charge,
>> 491 const G4double beta,
>> 492 const G4Material* aMaterial,
>> 493 const G4MaterialPropertyVector* Rindex) const
509 { 494 {
510 constexpr G4double Rfact = 369.81 / (eV * cm << 495 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 <<
572 496
573 return NumPhotons; << 497 if(beta <= 0.0)return 0.0;
574 } <<
575 498
576 //....oooOO0OOooo........oooOO0OOooo........oo << 499 G4double BetaInverse = 1./beta;
577 void G4Cerenkov::SetTrackSecondariesFirst(cons <<
578 { <<
579 fTrackSecondariesFirst = state; <<
580 G4OpticalParameters::Instance()->SetCerenkov <<
581 fTrackSecondariesFirst); <<
582 } <<
583 500
584 //....oooOO0OOooo........oooOO0OOooo........oo << 501 // Vectors used in computation of Cerenkov Angle Integral:
585 void G4Cerenkov::SetMaxBetaChangePerStep(const << 502 // - Refraction Indices for the current material
586 { << 503 // - new G4PhysicsOrderedFreeVector allocated to hold CAI's
587 fMaxBetaChange = value * CLHEP::perCent; << 504
588 G4OpticalParameters::Instance()->SetCerenkov << 505 G4int materialIndex = aMaterial->GetIndex();
589 } <<
590 506
591 //....oooOO0OOooo........oooOO0OOooo........oo << 507 // Retrieve the Cerenkov Angle Integrals for this material
592 void G4Cerenkov::SetMaxNumPhotonsPerStep(const <<
593 { <<
594 fMaxPhotons = NumPhotons; <<
595 G4OpticalParameters::Instance()->SetCerenkov <<
596 } <<
597 508
598 void G4Cerenkov::SetStackPhotons(const G4bool << 509 G4PhysicsOrderedFreeVector* CerenkovAngleIntegrals =
599 { << 510 (G4PhysicsOrderedFreeVector*)((*thePhysicsTable)(materialIndex));
600 fStackingFlag = stackingFlag; <<
601 G4OpticalParameters::Instance()->SetCerenkov <<
602 } <<
603 511
604 //....oooOO0OOooo........oooOO0OOooo........oo << 512 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 } <<
613 513
614 //....oooOO0OOooo........oooOO0OOooo........oo << 514 // Min and Max photon momenta
615 void G4Cerenkov::SetVerboseLevel(G4int verbose << 515 G4double Pmin = Rindex->GetMinPhotonMomentum();
616 { << 516 G4double Pmax = Rindex->GetMaxPhotonMomentum();
617 verboseLevel = verbose; << 517
618 G4OpticalParameters::Instance()->SetCerenkov << 518 // Min and Max Refraction Indices
>> 519 G4double nMin = Rindex->GetMinProperty();
>> 520 G4double nMax = Rindex->GetMaxProperty();
>> 521
>> 522 // Max Cerenkov Angle Integral
>> 523 G4double CAImax = CerenkovAngleIntegrals->GetMaxValue();
>> 524
>> 525 G4double dp, ge;
>> 526
>> 527 // If n(Pmax) < 1/Beta -- no photons generated
>> 528
>> 529 if (nMax < BetaInverse) {
>> 530 dp = 0;
>> 531 ge = 0;
>> 532 }
>> 533
>> 534 // otherwise if n(Pmin) >= 1/Beta -- photons generated
>> 535
>> 536 else if (nMin > BetaInverse) {
>> 537 dp = Pmax - Pmin;
>> 538 ge = CAImax;
>> 539 }
>> 540
>> 541 // If n(Pmin) < 1/Beta, and n(Pmax) >= 1/Beta, then
>> 542 // we need to find a P such that the value of n(P) == 1/Beta.
>> 543 // Interpolation is performed by the GetPhotonMomentum() and
>> 544 // GetProperty() methods of the G4MaterialPropertiesTable and
>> 545 // the GetValue() method of G4PhysicsVector.
>> 546
>> 547 else {
>> 548 Pmin = Rindex->GetPhotonMomentum(BetaInverse);
>> 549 dp = Pmax - Pmin;
>> 550
>> 551 // need boolean for current implementation of G4PhysicsVector
>> 552 // ==> being phased out
>> 553 G4bool isOutRange;
>> 554 G4double CAImin = CerenkovAngleIntegrals->
>> 555 GetValue(Pmin, isOutRange);
>> 556 ge = CAImax - CAImin;
>> 557
>> 558 if (verboseLevel>0) {
>> 559 G4cout << "CAImin = " << CAImin << G4endl;
>> 560 G4cout << "ge = " << ge << G4endl;
>> 561 }
>> 562 }
>> 563
>> 564 // Calculate number of photons
>> 565 G4double NumPhotons = Rfact * charge/eplus * charge/eplus *
>> 566 (dp - ge * BetaInverse*BetaInverse);
>> 567
>> 568 return NumPhotons;
619 } 569 }
620 570