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25 // 25 //
>> 26 //
>> 27 // $Id: G4Cerenkov.cc,v 1.26 2008/11/14 20:16:51 gum Exp $
>> 28 // GEANT4 tag $Name: geant4-09-02 $
>> 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"
>> 66 #include "G4Poisson.hh"
>> 67 #include "G4EmProcessSubType.hh"
>> 68
62 #include "G4LossTableManager.hh" 69 #include "G4LossTableManager.hh"
63 #include "G4Material.hh" <<
64 #include "G4MaterialCutsCouple.hh" 70 #include "G4MaterialCutsCouple.hh"
65 #include "G4MaterialPropertiesTable.hh" <<
66 #include "G4OpticalParameters.hh" <<
67 #include "G4OpticalPhoton.hh" <<
68 #include "G4ParticleDefinition.hh" 71 #include "G4ParticleDefinition.hh"
69 #include "G4ParticleMomentum.hh" <<
70 #include "G4PhysicalConstants.hh" <<
71 #include "G4PhysicsFreeVector.hh" <<
72 #include "G4Poisson.hh" <<
73 #include "G4SystemOfUnits.hh" <<
74 #include "G4ThreeVector.hh" <<
75 #include "Randomize.hh" <<
76 #include "G4PhysicsModelCatalog.hh" <<
77 72
78 //....oooOO0OOooo........oooOO0OOooo........oo << 73 #include "G4Cerenkov.hh"
>> 74
>> 75 using namespace std;
>> 76
>> 77 /////////////////////////
>> 78 // Class Implementation
>> 79 /////////////////////////
>> 80
>> 81 //////////////
>> 82 // Operators
>> 83 //////////////
>> 84
>> 85 // G4Cerenkov::operator=(const G4Cerenkov &right)
>> 86 // {
>> 87 // }
>> 88
>> 89 /////////////////
>> 90 // Constructors
>> 91 /////////////////
>> 92
79 G4Cerenkov::G4Cerenkov(const G4String& process 93 G4Cerenkov::G4Cerenkov(const G4String& processName, G4ProcessType type)
80 : G4VProcess(processName, type) << 94 : G4VProcess(processName, type)
81 , fNumPhotons(0) <<
82 { 95 {
83 secID = G4PhysicsModelCatalog::GetModelID("m << 96 G4cout << "G4Cerenkov::G4Cerenkov constructor" << G4endl;
84 SetProcessSubType(fCerenkov); << 97 G4cout << "NOTE: this is now a G4VProcess!" << G4endl;
>> 98 G4cout << "Required change in UserPhysicsList: " << G4endl;
>> 99 G4cout << "change: pmanager->AddContinuousProcess(theCerenkovProcess);" << G4endl;
>> 100 G4cout << "to: pmanager->AddProcess(theCerenkovProcess);" << G4endl;
>> 101 G4cout << " pmanager->SetProcessOrdering(theCerenkovProcess,idxPostStep);" << G4endl;
85 102
86 thePhysicsTable = nullptr; << 103 SetProcessSubType(fCerenkov);
87 104
88 if(verboseLevel > 0) << 105 fTrackSecondariesFirst = false;
89 { << 106 fMaxBetaChange = 0.;
90 G4cout << GetProcessName() << " is created << 107 fMaxPhotons = 0;
91 } <<
92 Initialise(); <<
93 } <<
94 108
95 //....oooOO0OOooo........oooOO0OOooo........oo << 109 thePhysicsTable = NULL;
96 G4Cerenkov::~G4Cerenkov() <<
97 { <<
98 if(thePhysicsTable != nullptr) <<
99 { <<
100 thePhysicsTable->clearAndDestroy(); <<
101 delete thePhysicsTable; <<
102 } <<
103 } <<
104 110
105 void G4Cerenkov::ProcessDescription(std::ostre << 111 if (verboseLevel>0) {
106 { << 112 G4cout << GetProcessName() << " is created " << G4endl;
107 out << "The Cerenkov effect simulates optica << 113 }
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 } <<
120 114
121 //....oooOO0OOooo........oooOO0OOooo........oo << 115 BuildThePhysicsTable();
122 G4bool G4Cerenkov::IsApplicable(const G4Partic <<
123 { <<
124 return (aParticleType.GetPDGCharge() != 0.0 <<
125 aParticleType.GetPDGMass() != 0.0 && <<
126 aParticleType.GetParticleName() != " <<
127 !aParticleType.IsShortLived()) <<
128 ? true <<
129 : false; <<
130 } 116 }
131 117
132 //....oooOO0OOooo........oooOO0OOooo........oo << 118 // G4Cerenkov::G4Cerenkov(const G4Cerenkov &right)
133 void G4Cerenkov::Initialise() << 119 // {
>> 120 // }
>> 121
>> 122 ////////////////
>> 123 // Destructors
>> 124 ////////////////
>> 125
>> 126 G4Cerenkov::~G4Cerenkov()
134 { 127 {
135 G4OpticalParameters* params = G4OpticalParam << 128 if (thePhysicsTable != NULL) {
136 SetMaxBetaChangePerStep(params->GetCerenkovM << 129 thePhysicsTable->clearAndDestroy();
137 SetMaxNumPhotonsPerStep(params->GetCerenkovM << 130 delete thePhysicsTable;
138 SetTrackSecondariesFirst(params->GetCerenkov << 131 }
139 SetStackPhotons(params->GetCerenkovStackPhot <<
140 SetVerboseLevel(params->GetCerenkovVerboseLe <<
141 } 132 }
142 133
143 //....oooOO0OOooo........oooOO0OOooo........oo << 134 ////////////
144 void G4Cerenkov::BuildPhysicsTable(const G4Par << 135 // Methods
>> 136 ////////////
>> 137
>> 138 // PostStepDoIt
>> 139 // -------------
>> 140 //
>> 141 G4VParticleChange*
>> 142 G4Cerenkov::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
>> 143
>> 144 // This routine is called for each tracking Step of a charged particle
>> 145 // in a radiator. A Poisson-distributed number of photons is generated
>> 146 // according to the Cerenkov formula, distributed evenly along the track
>> 147 // segment and uniformly azimuth w.r.t. the particle direction. The
>> 148 // parameters are then transformed into the Master Reference System, and
>> 149 // they are added to the particle change.
>> 150
145 { 151 {
146 if(thePhysicsTable) << 152 //////////////////////////////////////////////////////
147 return; << 153 // Should we ensure that the material is dispersive?
>> 154 //////////////////////////////////////////////////////
>> 155
>> 156 aParticleChange.Initialize(aTrack);
>> 157
>> 158 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
>> 159 const G4Material* aMaterial = aTrack.GetMaterial();
>> 160
>> 161 G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint();
>> 162 G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint();
>> 163
>> 164 G4ThreeVector x0 = pPreStepPoint->GetPosition();
>> 165 G4ThreeVector p0 = aStep.GetDeltaPosition().unit();
>> 166 G4double t0 = pPreStepPoint->GetGlobalTime();
148 167
149 const G4MaterialTable* theMaterialTable = G4 << 168 G4MaterialPropertiesTable* aMaterialPropertiesTable =
150 std::size_t numOfMaterials = G4 << 169 aMaterial->GetMaterialPropertiesTable();
>> 170 if (!aMaterialPropertiesTable) return pParticleChange;
151 171
152 thePhysicsTable = new G4PhysicsTable(numOfMa << 172 const G4MaterialPropertyVector* Rindex =
>> 173 aMaterialPropertiesTable->GetProperty("RINDEX");
>> 174 if (!Rindex) return pParticleChange;
>> 175
>> 176 // particle charge
>> 177 const G4double charge = aParticle->GetDefinition()->GetPDGCharge();
>> 178
>> 179 // particle beta
>> 180 const G4double beta = (pPreStepPoint ->GetBeta() +
>> 181 pPostStepPoint->GetBeta())/2.;
>> 182
>> 183 G4double MeanNumberOfPhotons =
>> 184 GetAverageNumberOfPhotons(charge,beta,aMaterial,Rindex);
>> 185
>> 186 if (MeanNumberOfPhotons <= 0.0) {
>> 187
>> 188 // return unchanged particle and no secondaries
>> 189
>> 190 aParticleChange.SetNumberOfSecondaries(0);
>> 191
>> 192 return pParticleChange;
153 193
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 } 194 }
204 } <<
205 } <<
206 195
207 // The Cerenkov integral for a given mater << 196 G4double step_length;
208 // thePhysicsTable according to the positi << 197 step_length = aStep.GetStepLength();
209 // the material table. <<
210 thePhysicsTable->insertAt(i, cerenkovInteg <<
211 } <<
212 } <<
213 198
214 //....oooOO0OOooo........oooOO0OOooo........oo << 199 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. <<
223 200
224 { << 201 G4int NumPhotons = (G4int) G4Poisson(MeanNumberOfPhotons);
225 aParticleChange.Initialize(aTrack); << 202
>> 203 if (NumPhotons <= 0) {
>> 204
>> 205 // return unchanged particle and no secondaries
>> 206
>> 207 aParticleChange.SetNumberOfSecondaries(0);
>> 208
>> 209 return pParticleChange;
>> 210 }
>> 211
>> 212 ////////////////////////////////////////////////////////////////
>> 213
>> 214 aParticleChange.SetNumberOfSecondaries(NumPhotons);
>> 215
>> 216 if (fTrackSecondariesFirst) {
>> 217 if (aTrack.GetTrackStatus() == fAlive )
>> 218 aParticleChange.ProposeTrackStatus(fSuspend);
>> 219 }
>> 220
>> 221 ////////////////////////////////////////////////////////////////
>> 222
>> 223 G4double Pmin = Rindex->GetMinPhotonEnergy();
>> 224 G4double Pmax = Rindex->GetMaxPhotonEnergy();
>> 225 G4double dp = Pmax - Pmin;
>> 226
>> 227 G4double nMax = Rindex->GetMaxProperty();
>> 228
>> 229 G4double BetaInverse = 1./beta;
>> 230
>> 231 G4double maxCos = BetaInverse / nMax;
>> 232 G4double maxSin2 = (1.0 - maxCos) * (1.0 + maxCos);
>> 233
>> 234 const G4double beta1 = pPreStepPoint ->GetBeta();
>> 235 const G4double beta2 = pPostStepPoint->GetBeta();
>> 236
>> 237 G4double MeanNumberOfPhotons1 =
>> 238 GetAverageNumberOfPhotons(charge,beta1,aMaterial,Rindex);
>> 239 G4double MeanNumberOfPhotons2 =
>> 240 GetAverageNumberOfPhotons(charge,beta2,aMaterial,Rindex);
>> 241
>> 242 for (G4int i = 0; i < NumPhotons; i++) {
>> 243
>> 244 // Determine photon energy
>> 245
>> 246 G4double rand;
>> 247 G4double sampledEnergy, sampledRI;
>> 248 G4double cosTheta, sin2Theta;
>> 249
>> 250 // sample an energy
>> 251
>> 252 do {
>> 253 rand = G4UniformRand();
>> 254 sampledEnergy = Pmin + rand * dp;
>> 255 sampledRI = Rindex->GetProperty(sampledEnergy);
>> 256 cosTheta = BetaInverse / sampledRI;
>> 257
>> 258 sin2Theta = (1.0 - cosTheta)*(1.0 + cosTheta);
>> 259 rand = G4UniformRand();
>> 260
>> 261 } while (rand*maxSin2 > sin2Theta);
>> 262
>> 263 // Generate random position of photon on cone surface
>> 264 // defined by Theta
>> 265
>> 266 rand = G4UniformRand();
>> 267
>> 268 G4double phi = twopi*rand;
>> 269 G4double sinPhi = sin(phi);
>> 270 G4double cosPhi = cos(phi);
>> 271
>> 272 // calculate x,y, and z components of photon energy
>> 273 // (in coord system with primary particle direction
>> 274 // aligned with the z axis)
>> 275
>> 276 G4double sinTheta = sqrt(sin2Theta);
>> 277 G4double px = sinTheta*cosPhi;
>> 278 G4double py = sinTheta*sinPhi;
>> 279 G4double pz = cosTheta;
>> 280
>> 281 // Create photon momentum direction vector
>> 282 // The momentum direction is still with respect
>> 283 // to the coordinate system where the primary
>> 284 // particle direction is aligned with the z axis
>> 285
>> 286 G4ParticleMomentum photonMomentum(px, py, pz);
>> 287
>> 288 // Rotate momentum direction back to global reference
>> 289 // system
>> 290
>> 291 photonMomentum.rotateUz(p0);
>> 292
>> 293 // Determine polarization of new photon
>> 294
>> 295 G4double sx = cosTheta*cosPhi;
>> 296 G4double sy = cosTheta*sinPhi;
>> 297 G4double sz = -sinTheta;
>> 298
>> 299 G4ThreeVector photonPolarization(sx, sy, sz);
>> 300
>> 301 // Rotate back to original coord system
>> 302
>> 303 photonPolarization.rotateUz(p0);
>> 304
>> 305 // Generate a new photon:
>> 306
>> 307 G4DynamicParticle* aCerenkovPhoton =
>> 308 new G4DynamicParticle(G4OpticalPhoton::OpticalPhoton(),
>> 309 photonMomentum);
>> 310 aCerenkovPhoton->SetPolarization
>> 311 (photonPolarization.x(),
>> 312 photonPolarization.y(),
>> 313 photonPolarization.z());
>> 314
>> 315 aCerenkovPhoton->SetKineticEnergy(sampledEnergy);
>> 316
>> 317 // Generate new G4Track object:
>> 318
>> 319 G4double delta, NumberOfPhotons, N;
>> 320
>> 321 do {
>> 322 rand = G4UniformRand();
>> 323 delta = rand * aStep.GetStepLength();
>> 324 NumberOfPhotons = MeanNumberOfPhotons1 - delta *
>> 325 (MeanNumberOfPhotons1-MeanNumberOfPhotons2)/
>> 326 aStep.GetStepLength();
>> 327 N = G4UniformRand() *
>> 328 std::max(MeanNumberOfPhotons1,MeanNumberOfPhotons2);
>> 329 } while (N > NumberOfPhotons);
>> 330
>> 331 G4double deltaTime = delta /
>> 332 ((pPreStepPoint->GetVelocity()+
>> 333 pPostStepPoint->GetVelocity())/2.);
>> 334
>> 335 G4double aSecondaryTime = t0 + deltaTime;
226 336
227 const G4DynamicParticle* aParticle = aTrack. << 337 G4ThreeVector aSecondaryPosition =
228 const G4Material* aMaterial = aTrack. << 338 x0 + rand * aStep.GetDeltaPosition();
229 339
230 G4StepPoint* pPreStepPoint = aStep.GetPreSt << 340 G4Track* aSecondaryTrack =
231 G4StepPoint* pPostStepPoint = aStep.GetPostS << 341 new G4Track(aCerenkovPhoton,aSecondaryTime,aSecondaryPosition);
232 342
233 G4ThreeVector x0 = pPreStepPoint->GetPositio << 343 aSecondaryTrack->SetTouchableHandle(
234 G4ThreeVector p0 = aStep.GetDeltaPosition(). << 344 aStep.GetPreStepPoint()->GetTouchableHandle());
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 } <<
385 345
386 return pParticleChange; << 346 aSecondaryTrack->SetParentID(aTrack.GetTrackID());
>> 347
>> 348 aParticleChange.AddSecondary(aSecondaryTrack);
>> 349 }
>> 350
>> 351 if (verboseLevel>0) {
>> 352 G4cout << "\n Exiting from G4Cerenkov::DoIt -- NumberOfSecondaries = "
>> 353 << aParticleChange.GetNumberOfSecondaries() << G4endl;
>> 354 }
>> 355
>> 356 return pParticleChange;
387 } 357 }
388 358
389 //....oooOO0OOooo........oooOO0OOooo........oo << 359 // BuildThePhysicsTable for the Cerenkov process
390 void G4Cerenkov::PreparePhysicsTable(const G4P << 360 // ---------------------------------------------
>> 361 //
>> 362
>> 363 void G4Cerenkov::BuildThePhysicsTable()
391 { 364 {
392 Initialise(); << 365 if (thePhysicsTable) return;
>> 366
>> 367 const G4MaterialTable* theMaterialTable=
>> 368 G4Material::GetMaterialTable();
>> 369 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
>> 370
>> 371 // create new physics table
>> 372
>> 373 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 374
>> 375 // loop for materials
>> 376
>> 377 for (G4int i=0 ; i < numOfMaterials; i++)
>> 378 {
>> 379 G4PhysicsOrderedFreeVector* aPhysicsOrderedFreeVector =
>> 380 new G4PhysicsOrderedFreeVector();
>> 381
>> 382 // Retrieve vector of refraction indices for the material
>> 383 // from the material's optical properties table
>> 384
>> 385 G4Material* aMaterial = (*theMaterialTable)[i];
>> 386
>> 387 G4MaterialPropertiesTable* aMaterialPropertiesTable =
>> 388 aMaterial->GetMaterialPropertiesTable();
>> 389
>> 390 if (aMaterialPropertiesTable) {
>> 391
>> 392 G4MaterialPropertyVector* theRefractionIndexVector =
>> 393 aMaterialPropertiesTable->GetProperty("RINDEX");
>> 394
>> 395 if (theRefractionIndexVector) {
>> 396
>> 397 // Retrieve the first refraction index in vector
>> 398 // of (photon energy, refraction index) pairs
>> 399
>> 400 theRefractionIndexVector->ResetIterator();
>> 401 ++(*theRefractionIndexVector); // advance to 1st entry
>> 402
>> 403 G4double currentRI = theRefractionIndexVector->
>> 404 GetProperty();
>> 405
>> 406 if (currentRI > 1.0) {
>> 407
>> 408 // Create first (photon energy, Cerenkov Integral)
>> 409 // pair
>> 410
>> 411 G4double currentPM = theRefractionIndexVector->
>> 412 GetPhotonEnergy();
>> 413 G4double currentCAI = 0.0;
>> 414
>> 415 aPhysicsOrderedFreeVector->
>> 416 InsertValues(currentPM , currentCAI);
>> 417
>> 418 // Set previous values to current ones prior to loop
>> 419
>> 420 G4double prevPM = currentPM;
>> 421 G4double prevCAI = currentCAI;
>> 422 G4double prevRI = currentRI;
>> 423
>> 424 // loop over all (photon energy, refraction index)
>> 425 // pairs stored for this material
>> 426
>> 427 while(++(*theRefractionIndexVector))
>> 428 {
>> 429 currentRI=theRefractionIndexVector->
>> 430 GetProperty();
>> 431
>> 432 currentPM = theRefractionIndexVector->
>> 433 GetPhotonEnergy();
>> 434
>> 435 currentCAI = 0.5*(1.0/(prevRI*prevRI) +
>> 436 1.0/(currentRI*currentRI));
>> 437
>> 438 currentCAI = prevCAI +
>> 439 (currentPM - prevPM) * currentCAI;
>> 440
>> 441 aPhysicsOrderedFreeVector->
>> 442 InsertValues(currentPM, currentCAI);
>> 443
>> 444 prevPM = currentPM;
>> 445 prevCAI = currentCAI;
>> 446 prevRI = currentRI;
>> 447 }
>> 448
>> 449 }
>> 450 }
>> 451 }
>> 452
>> 453 // The Cerenkov integral for a given material
>> 454 // will be inserted in thePhysicsTable
>> 455 // according to the position of the material in
>> 456 // the material table.
>> 457
>> 458 thePhysicsTable->insertAt(i,aPhysicsOrderedFreeVector);
>> 459
>> 460 }
393 } 461 }
394 462
395 //....oooOO0OOooo........oooOO0OOooo........oo << 463 // GetMeanFreePath
396 G4double G4Cerenkov::GetMeanFreePath(const G4T << 464 // ---------------
397 G4ForceCo << 465 //
>> 466
>> 467 G4double G4Cerenkov::GetMeanFreePath(const G4Track&,
>> 468 G4double,
>> 469 G4ForceCondition*)
398 { 470 {
399 return 1.; << 471 return 1.;
400 } 472 }
401 473
402 //....oooOO0OOooo........oooOO0OOooo........oo <<
403 G4double G4Cerenkov::PostStepGetPhysicalIntera 474 G4double G4Cerenkov::PostStepGetPhysicalInteractionLength(
404 const G4Track& aTrack, G4double, G4ForceCond << 475 const G4Track& aTrack,
405 { << 476 G4double,
406 *condition = NotForced; << 477 G4ForceCondition* condition)
407 G4double StepLimit = DBL_MAX; << 478 {
408 fNumPhotons = 0; << 479 *condition = NotForced;
409 << 480 G4double StepLimit = DBL_MAX;
410 const G4Material* aMaterial = aTrack.GetMate << 481
411 std::size_t materialIndex = aMaterial->Get << 482 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
412 << 483 const G4Material* aMaterial = aTrack.GetMaterial();
413 // If Physics Vector is not defined no Ceren << 484 const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple();
414 if(!(*thePhysicsTable)[materialIndex]) << 485
415 { << 486 const G4double kineticEnergy = aParticle->GetKineticEnergy();
416 return StepLimit; << 487 const G4ParticleDefinition* particleType = aParticle->GetDefinition();
417 } << 488 const G4double mass = particleType->GetPDGMass();
418 << 489
419 const G4DynamicParticle* aParticle = aTrack. << 490 // particle beta
420 const G4MaterialCutsCouple* couple = aTrack. << 491 const G4double beta = aParticle->GetTotalMomentum() /
421 << 492 aParticle->GetTotalEnergy();
422 G4double kineticEnergy = a << 493 // particle gamma
423 const G4ParticleDefinition* particleType = a << 494 const G4double gamma = 1./std::sqrt(1.-beta*beta);
424 G4double mass = p << 495
425 << 496 G4MaterialPropertiesTable* aMaterialPropertiesTable =
426 G4double beta = aParticle->GetTotalMomentum << 497 aMaterial->GetMaterialPropertiesTable();
427 G4double gamma = aParticle->GetTotalEnergy() << 498
428 << 499 const G4MaterialPropertyVector* Rindex = NULL;
429 G4MaterialPropertiesTable* aMaterialProperti << 500
430 aMaterial->GetMaterialPropertiesTable(); << 501 if (aMaterialPropertiesTable)
431 << 502 Rindex = aMaterialPropertiesTable->GetProperty("RINDEX");
432 G4MaterialPropertyVector* Rindex = nullptr; << 503
433 << 504 G4double nMax;
434 if(aMaterialPropertiesTable) << 505 if (Rindex) {
435 Rindex = aMaterialPropertiesTable->GetProp << 506 nMax = Rindex->GetMaxProperty();
436 << 507 } else {
437 G4double nMax; << 508 return StepLimit;
438 if(Rindex) << 509 }
439 { << 510
440 nMax = Rindex->GetMaxValue(); << 511 G4double BetaMin = 1./nMax;
441 } << 512 if ( BetaMin >= 1. ) return StepLimit;
442 else << 513
443 { << 514 G4double GammaMin = 1./std::sqrt(1.-BetaMin*BetaMin);
444 return StepLimit; << 515
445 } << 516 if (gamma < GammaMin ) return StepLimit;
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 } <<
498 517
499 *condition = StronglyForced; << 518 G4double kinEmin = mass*(GammaMin-1.);
500 return StepLimit; << 519
>> 520 G4double RangeMin = G4LossTableManager::Instance()->
>> 521 GetRange(particleType,
>> 522 kinEmin,
>> 523 couple);
>> 524 G4double Range = G4LossTableManager::Instance()->
>> 525 GetRange(particleType,
>> 526 kineticEnergy,
>> 527 couple);
>> 528
>> 529 G4double Step = Range - RangeMin;
>> 530 if (Step < 1.*um ) return StepLimit;
>> 531
>> 532 if (Step > 0. && Step < StepLimit) StepLimit = Step;
>> 533
>> 534 // If user has defined an average maximum number of photons to
>> 535 // be generated in a Step, then calculate the Step length for
>> 536 // that number of photons.
>> 537
>> 538 if (fMaxPhotons > 0) {
>> 539
>> 540 // particle charge
>> 541 const G4double charge = aParticle->
>> 542 GetDefinition()->GetPDGCharge();
>> 543
>> 544 G4double MeanNumberOfPhotons =
>> 545 GetAverageNumberOfPhotons(charge,beta,aMaterial,Rindex);
>> 546
>> 547 G4double Step = 0.;
>> 548 if (MeanNumberOfPhotons > 0.0) Step = fMaxPhotons /
>> 549 MeanNumberOfPhotons;
>> 550
>> 551 if (Step > 0. && Step < StepLimit) StepLimit = Step;
>> 552 }
>> 553
>> 554 // If user has defined an maximum allowed change in beta per step
>> 555 if (fMaxBetaChange > 0.) {
>> 556
>> 557 G4double dedx = G4LossTableManager::Instance()->
>> 558 GetDEDX(particleType,
>> 559 kineticEnergy,
>> 560 couple);
>> 561
>> 562 G4double deltaGamma = gamma -
>> 563 1./std::sqrt(1.-beta*beta*
>> 564 (1.-fMaxBetaChange)*
>> 565 (1.-fMaxBetaChange));
>> 566
>> 567 G4double Step = mass * deltaGamma / dedx;
>> 568
>> 569 if (Step > 0. && Step < StepLimit) StepLimit = Step;
>> 570
>> 571 }
>> 572
>> 573 *condition = StronglyForced;
>> 574 return StepLimit;
501 } 575 }
502 576
503 //....oooOO0OOooo........oooOO0OOooo........oo << 577 // GetAverageNumberOfPhotons
504 G4double G4Cerenkov::GetAverageNumberOfPhotons << 578 // -------------------------
505 const G4double charge, const G4double beta, <<
506 G4MaterialPropertyVector* Rindex) const <<
507 // This routine computes the number of Cerenko 579 // This routine computes the number of Cerenkov photons produced per
508 // Geant4-unit (millimeter) in the current med << 580 // GEANT-unit (millimeter) in the current medium.
>> 581 // ^^^^^^^^^^
>> 582
>> 583 G4double
>> 584 G4Cerenkov::GetAverageNumberOfPhotons(const G4double charge,
>> 585 const G4double beta,
>> 586 const G4Material* aMaterial,
>> 587 const G4MaterialPropertyVector* Rindex) const
509 { 588 {
510 constexpr G4double Rfact = 369.81 / (eV * cm << 589 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 <<
572 590
573 return NumPhotons; << 591 if(beta <= 0.0)return 0.0;
574 } <<
575 592
576 //....oooOO0OOooo........oooOO0OOooo........oo << 593 G4double BetaInverse = 1./beta;
577 void G4Cerenkov::SetTrackSecondariesFirst(cons <<
578 { <<
579 fTrackSecondariesFirst = state; <<
580 G4OpticalParameters::Instance()->SetCerenkov <<
581 fTrackSecondariesFirst); <<
582 } <<
583 594
584 //....oooOO0OOooo........oooOO0OOooo........oo << 595 // Vectors used in computation of Cerenkov Angle Integral:
585 void G4Cerenkov::SetMaxBetaChangePerStep(const << 596 // - Refraction Indices for the current material
586 { << 597 // - new G4PhysicsOrderedFreeVector allocated to hold CAI's
587 fMaxBetaChange = value * CLHEP::perCent; << 598
588 G4OpticalParameters::Instance()->SetCerenkov << 599 G4int materialIndex = aMaterial->GetIndex();
589 } <<
590 600
591 //....oooOO0OOooo........oooOO0OOooo........oo << 601 // Retrieve the Cerenkov Angle Integrals for this material
592 void G4Cerenkov::SetMaxNumPhotonsPerStep(const <<
593 { <<
594 fMaxPhotons = NumPhotons; <<
595 G4OpticalParameters::Instance()->SetCerenkov <<
596 } <<
597 602
598 void G4Cerenkov::SetStackPhotons(const G4bool << 603 G4PhysicsOrderedFreeVector* CerenkovAngleIntegrals =
599 { << 604 (G4PhysicsOrderedFreeVector*)((*thePhysicsTable)(materialIndex));
600 fStackingFlag = stackingFlag; <<
601 G4OpticalParameters::Instance()->SetCerenkov <<
602 } <<
603 605
604 //....oooOO0OOooo........oooOO0OOooo........oo << 606 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 } <<
613 607
614 //....oooOO0OOooo........oooOO0OOooo........oo << 608 // Min and Max photon energies
615 void G4Cerenkov::SetVerboseLevel(G4int verbose << 609 G4double Pmin = Rindex->GetMinPhotonEnergy();
616 { << 610 G4double Pmax = Rindex->GetMaxPhotonEnergy();
617 verboseLevel = verbose; << 611
618 G4OpticalParameters::Instance()->SetCerenkov << 612 // Min and Max Refraction Indices
>> 613 G4double nMin = Rindex->GetMinProperty();
>> 614 G4double nMax = Rindex->GetMaxProperty();
>> 615
>> 616 // Max Cerenkov Angle Integral
>> 617 G4double CAImax = CerenkovAngleIntegrals->GetMaxValue();
>> 618
>> 619 G4double dp, ge;
>> 620
>> 621 // If n(Pmax) < 1/Beta -- no photons generated
>> 622
>> 623 if (nMax < BetaInverse) {
>> 624 dp = 0;
>> 625 ge = 0;
>> 626 }
>> 627
>> 628 // otherwise if n(Pmin) >= 1/Beta -- photons generated
>> 629
>> 630 else if (nMin > BetaInverse) {
>> 631 dp = Pmax - Pmin;
>> 632 ge = CAImax;
>> 633 }
>> 634
>> 635 // If n(Pmin) < 1/Beta, and n(Pmax) >= 1/Beta, then
>> 636 // we need to find a P such that the value of n(P) == 1/Beta.
>> 637 // Interpolation is performed by the GetPhotonEnergy() and
>> 638 // GetProperty() methods of the G4MaterialPropertiesTable and
>> 639 // the GetValue() method of G4PhysicsVector.
>> 640
>> 641 else {
>> 642 Pmin = Rindex->GetPhotonEnergy(BetaInverse);
>> 643 dp = Pmax - Pmin;
>> 644
>> 645 // need boolean for current implementation of G4PhysicsVector
>> 646 // ==> being phased out
>> 647 G4bool isOutRange;
>> 648 G4double CAImin = CerenkovAngleIntegrals->
>> 649 GetValue(Pmin, isOutRange);
>> 650 ge = CAImax - CAImin;
>> 651
>> 652 if (verboseLevel>0) {
>> 653 G4cout << "CAImin = " << CAImin << G4endl;
>> 654 G4cout << "ge = " << ge << G4endl;
>> 655 }
>> 656 }
>> 657
>> 658 // Calculate number of photons
>> 659 G4double NumPhotons = Rfact * charge/eplus * charge/eplus *
>> 660 (dp - ge * BetaInverse*BetaInverse);
>> 661
>> 662 return NumPhotons;
619 } 663 }
620 664