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25 // 25 //
26 // 26 //
>> 27 // $Id: G4OpRayleigh.cc,v 1.17 2008/10/24 19:51:12 gum Exp $
>> 28 // GEANT4 tag $Name: geant4-09-02-patch-04 $
27 // 29 //
28 // << 30 //
29 ////////////////////////////////////////////// 31 ////////////////////////////////////////////////////////////////////////
30 // Optical Photon Rayleigh Scattering Class Im 32 // Optical Photon Rayleigh Scattering Class Implementation
31 ////////////////////////////////////////////// 33 ////////////////////////////////////////////////////////////////////////
32 // 34 //
33 // File: G4OpRayleigh.cc << 35 // File: G4OpRayleigh.cc
34 // Description: Discrete Process -- Rayleigh s << 36 // Description: Discrete Process -- Rayleigh scattering of optical
35 // photons << 37 // photons
36 // Version: 1.0 38 // Version: 1.0
37 // Created: 1996-05-31 << 39 // Created: 1996-05-31
38 // Author: Juliet Armstrong 40 // Author: Juliet Armstrong
39 // Updated: 2014-10-10 - This version cal << 41 // Updated: 2005-07-28 - add G4ProcessType to constructor
40 // length for more materials than <<
41 // default is kept). To do this t <<
42 // ISOTHERMAL_COMPRESSIBILITY as <<
43 // optionally an RS_SCALE_LENGTH <<
44 // from Philip Graham (Queen Mary <<
45 // 2010-06-11 - Fix Bug 207; Than <<
46 // (Kellogg Radiation Lab of Calt <<
47 // 2005-07-28 - add G4ProcessType <<
48 // 2001-10-18 by Peter Gumplinger 42 // 2001-10-18 by Peter Gumplinger
49 // eliminate unused variable warn 43 // eliminate unused variable warning on Linux (gcc-2.95.2)
50 // 2001-09-18 by mma 44 // 2001-09-18 by mma
51 // >numOfMaterials=G4Material::Ge << 45 // >numOfMaterials=G4Material::GetNumberOfMaterials() in BuildPhy
52 // 2001-01-30 by Peter Gumplinger 46 // 2001-01-30 by Peter Gumplinger
53 // > allow for positiv and negati 47 // > allow for positiv and negative CosTheta and force the
54 // > new momentum direction to be 48 // > new momentum direction to be in the same plane as the
55 // > new and old polarization vec 49 // > new and old polarization vectors
56 // 2001-01-29 by Peter Gumplinger 50 // 2001-01-29 by Peter Gumplinger
57 // > fix calculation of SinTheta 51 // > fix calculation of SinTheta (from CosTheta)
58 // 1997-04-09 by Peter Gumplinger 52 // 1997-04-09 by Peter Gumplinger
59 // > new physics/tracking scheme 53 // > new physics/tracking scheme
>> 54 // mail: gum@triumf.ca
60 // 55 //
61 ////////////////////////////////////////////// 56 ////////////////////////////////////////////////////////////////////////
62 57
63 #include "G4OpRayleigh.hh" <<
64 #include "G4ios.hh" 58 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" <<
66 #include "G4SystemOfUnits.hh" <<
67 #include "G4OpticalParameters.hh" <<
68 #include "G4OpProcessSubType.hh" 59 #include "G4OpProcessSubType.hh"
69 60
70 //....oooOO0OOooo........oooOO0OOooo........oo << 61 #include "G4OpRayleigh.hh"
>> 62
>> 63 /////////////////////////
>> 64 // Class Implementation
>> 65 /////////////////////////
>> 66
>> 67 //////////////
>> 68 // Operators
>> 69 //////////////
>> 70
>> 71 // G4OpRayleigh::operator=(const G4OpRayleigh &right)
>> 72 // {
>> 73 // }
>> 74
>> 75 /////////////////
>> 76 // Constructors
>> 77 /////////////////
>> 78
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro 79 G4OpRayleigh::G4OpRayleigh(const G4String& processName, G4ProcessType type)
72 : G4VDiscreteProcess(processName, type) << 80 : G4VDiscreteProcess(processName, type)
73 { 81 {
74 Initialise(); << 82 SetProcessSubType(fOpRayleigh);
75 SetProcessSubType(fOpRayleigh); << 83
76 thePhysicsTable = nullptr; << 84 thePhysicsTable = 0;
77 << 85
78 if(verboseLevel > 0) << 86 DefaultWater = false;
79 { << 87
80 G4cout << GetProcessName() << " is created << 88 if (verboseLevel>0) {
81 } << 89 G4cout << GetProcessName() << " is created " << G4endl;
>> 90 }
>> 91
>> 92 BuildThePhysicsTable();
82 } 93 }
83 94
84 //....oooOO0OOooo........oooOO0OOooo........oo << 95 // G4OpRayleigh::G4OpRayleigh(const G4OpRayleigh &right)
>> 96 // {
>> 97 // }
>> 98
>> 99 ////////////////
>> 100 // Destructors
>> 101 ////////////////
>> 102
85 G4OpRayleigh::~G4OpRayleigh() 103 G4OpRayleigh::~G4OpRayleigh()
86 { 104 {
87 // VI: inside this PhysicsTable all properti << 105 if (thePhysicsTable!= 0) {
88 // it is not possible to destroy << 106 thePhysicsTable->clearAndDestroy();
89 delete thePhysicsTable; << 107 delete thePhysicsTable;
>> 108 }
90 } 109 }
91 110
92 //....oooOO0OOooo........oooOO0OOooo........oo << 111 ////////////
93 void G4OpRayleigh::PreparePhysicsTable(const G << 112 // Methods
94 { << 113 ////////////
95 Initialise(); <<
96 } <<
97 114
98 //....oooOO0OOooo........oooOO0OOooo........oo << 115 // PostStepDoIt
99 void G4OpRayleigh::Initialise() << 116 // -------------
>> 117 //
>> 118 G4VParticleChange*
>> 119 G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
100 { 120 {
101 SetVerboseLevel(G4OpticalParameters::Instanc << 121 aParticleChange.Initialize(aTrack);
102 } <<
103 122
104 //....oooOO0OOooo........oooOO0OOooo........oo << 123 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( <<
106 <<
107 { <<
108 aParticleChange.Initialize(aTrack); <<
109 const G4DynamicParticle* aParticle = aTrack. <<
110 124
111 if(verboseLevel > 1) << 125 if (verboseLevel>0) {
112 { << 126 G4cout << "Scattering Photon!" << G4endl;
113 G4cout << "OpRayleigh: Scattering Photon!" << 127 G4cout << "Old Momentum Direction: "
114 << "Old Momentum Direction: " << aP << 128 << aParticle->GetMomentumDirection() << G4endl;
115 << G4endl << "Old Polarization: " < << 129 G4cout << "Old Polarization: "
116 << G4endl; << 130 << aParticle->GetPolarization() << G4endl;
117 } << 131 }
118 <<
119 G4double cosTheta; <<
120 G4ThreeVector oldMomDir, newMomDir; <<
121 G4ThreeVector oldPol, newPol; <<
122 G4double rand; <<
123 G4double cost, sint, sinphi, cosphi; <<
124 <<
125 do <<
126 { <<
127 // Try to simulate the scattered photon mo <<
128 // w.r.t. the initial photon momentum dire <<
129 cost = G4UniformRand(); <<
130 sint = std::sqrt(1. - cost * cost); <<
131 // consider for the angle 90-180 degrees <<
132 if(G4UniformRand() < 0.5) <<
133 cost = -cost; <<
134 <<
135 // simulate the phi angle <<
136 rand = twopi * G4UniformRand(); <<
137 sinphi = std::sin(rand); <<
138 cosphi = std::cos(rand); <<
139 <<
140 // construct the new momentum direction <<
141 newMomDir.set(sint * cosphi, sint * sinphi <<
142 oldMomDir = aParticle->GetMomentumDirectio <<
143 newMomDir.rotateUz(oldMomDir); <<
144 <<
145 // calculate the new polarization directio <<
146 // The new polarization needs to be in the <<
147 // momentum direction and the old polariza <<
148 oldPol = aParticle->GetPolarization(); <<
149 newPol = (oldPol - newMomDir.dot(oldPol) * <<
150 <<
151 // There is a corner case, where the new m <<
152 // is the same as old polarization directi <<
153 // random generate the azimuthal angle w.r <<
154 if(newPol.mag() == 0.) <<
155 { <<
156 rand = G4UniformRand() * twopi; <<
157 newPol.set(std::cos(rand), std::sin(rand <<
158 newPol.rotateUz(newMomDir); <<
159 } <<
160 else <<
161 { <<
162 // There are two directions perpendicula <<
163 if(G4UniformRand() < 0.5) <<
164 newPol = -newPol; <<
165 } <<
166 <<
167 // simulate according to the distribution <<
168 cosTheta = newPol.dot(oldPol); <<
169 // Loop checking, 13-Aug-2015, Peter Gumpl <<
170 } while(std::pow(cosTheta, 2) < G4UniformRan <<
171 <<
172 aParticleChange.ProposePolarization(newPol); <<
173 aParticleChange.ProposeMomentumDirection(new <<
174 <<
175 if(verboseLevel > 1) <<
176 { <<
177 G4cout << "New Polarization: " << newPol < <<
178 << "Polarization Change: " << *(aPa <<
179 << G4endl << "New Momentum Directio <<
180 << "Momentum Change: " << *(aPartic <<
181 << G4endl; <<
182 } <<
183 132
184 return G4VDiscreteProcess::PostStepDoIt(aTra << 133 // find polar angle w.r.t. old polarization vector
185 } <<
186 134
187 //....oooOO0OOooo........oooOO0OOooo........oo << 135 G4double rand = G4UniformRand();
188 void G4OpRayleigh::BuildPhysicsTable(const G4P << 136
189 { << 137 G4double CosTheta = std::pow(rand, 1./3.);
190 if(thePhysicsTable) << 138 G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
191 { << 139
192 // thePhysicsTable->clearAndDestroy(); << 140 if(G4UniformRand() < 0.5)CosTheta = -CosTheta;
193 delete thePhysicsTable; << 141
194 thePhysicsTable = nullptr; << 142 // find azimuthal angle w.r.t old polarization vector
195 } << 143
196 << 144 rand = G4UniformRand();
197 const G4MaterialTable* theMaterialTable = G4 << 145
198 const size_t numOfMaterials = G4 << 146 G4double Phi = twopi*rand;
199 thePhysicsTable = ne << 147 G4double SinPhi = std::sin(Phi);
200 << 148 G4double CosPhi = std::cos(Phi);
201 for(size_t i = 0; i < numOfMaterials; ++i) << 149
202 { << 150 G4double unit_x = SinTheta * CosPhi;
203 G4Material* material = (*the << 151 G4double unit_y = SinTheta * SinPhi;
204 G4MaterialPropertiesTable* matProp = mater << 152 G4double unit_z = CosTheta;
205 G4PhysicsFreeVector* rayleigh = nullptr; << 153
206 if(matProp) << 154 G4ThreeVector NewPolarization (unit_x,unit_y,unit_z);
207 { << 155
208 rayleigh = matProp->GetProperty(kRAYLEIG << 156 // Rotate new polarization direction into global reference system
209 if(rayleigh == nullptr) << 157
210 rayleigh = CalculateRayleighMeanFreePa << 158 G4ThreeVector OldPolarization = aParticle->GetPolarization();
211 } << 159 OldPolarization = OldPolarization.unit();
212 thePhysicsTable->insertAt(i, rayleigh); << 160
213 } << 161 NewPolarization.rotateUz(OldPolarization);
>> 162 NewPolarization = NewPolarization.unit();
>> 163
>> 164 // -- new momentum direction is normal to the new
>> 165 // polarization vector and in the same plane as the
>> 166 // old and new polarization vectors --
>> 167
>> 168 G4ThreeVector NewMomentumDirection =
>> 169 OldPolarization - NewPolarization * CosTheta;
>> 170
>> 171 if(G4UniformRand() < 0.5)NewMomentumDirection = -NewMomentumDirection;
>> 172 NewMomentumDirection = NewMomentumDirection.unit();
>> 173
>> 174 aParticleChange.ProposePolarization(NewPolarization);
>> 175
>> 176 aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
>> 177
>> 178 if (verboseLevel>0) {
>> 179 G4cout << "New Polarization: "
>> 180 << NewPolarization << G4endl;
>> 181 G4cout << "Polarization Change: "
>> 182 << *(aParticleChange.GetPolarization()) << G4endl;
>> 183 G4cout << "New Momentum Direction: "
>> 184 << NewMomentumDirection << G4endl;
>> 185 G4cout << "Momentum Change: "
>> 186 << *(aParticleChange.GetMomentumDirection()) << G4endl;
>> 187 }
>> 188
>> 189 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
214 } 190 }
215 191
216 //....oooOO0OOooo........oooOO0OOooo........oo << 192 // BuildThePhysicsTable for the Rayleigh Scattering process
217 G4double G4OpRayleigh::GetMeanFreePath(const G << 193 // --------------------------------------------------------
218 G4Force << 194 //
>> 195 void G4OpRayleigh::BuildThePhysicsTable()
219 { 196 {
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 197 // Builds a table of scattering lengths for each material
221 (*thePhysicsTable)(aTrack.GetMaterial()- << 198
>> 199 if (thePhysicsTable) return;
222 200
223 G4double rsLength = DBL_MAX; << 201 const G4MaterialTable* theMaterialTable=
224 if(rayleigh) << 202 G4Material::GetMaterialTable();
225 { << 203 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
226 rsLength = rayleigh->Value(aTrack.GetDynam << 204
227 idx_rslength); << 205 // create a new physics table
228 } << 206
229 return rsLength; << 207 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 208
>> 209 // loop for materials
>> 210
>> 211 for (G4int i=0 ; i < numOfMaterials; i++)
>> 212 {
>> 213 G4PhysicsOrderedFreeVector* ScatteringLengths =
>> 214 new G4PhysicsOrderedFreeVector();
>> 215
>> 216 G4MaterialPropertiesTable *aMaterialPropertiesTable =
>> 217 (*theMaterialTable)[i]->GetMaterialPropertiesTable();
>> 218
>> 219 if(aMaterialPropertiesTable){
>> 220
>> 221 G4MaterialPropertyVector* AttenuationLengthVector =
>> 222 aMaterialPropertiesTable->GetProperty("RAYLEIGH");
>> 223
>> 224 if(!AttenuationLengthVector){
>> 225
>> 226 if ((*theMaterialTable)[i]->GetName() == "Water")
>> 227 {
>> 228 // Call utility routine to Generate
>> 229 // Rayleigh Scattering Lengths
>> 230
>> 231 DefaultWater = true;
>> 232
>> 233 ScatteringLengths =
>> 234 RayleighAttenuationLengthGenerator(aMaterialPropertiesTable);
>> 235 }
>> 236 }
>> 237 }
>> 238
>> 239 thePhysicsTable->insertAt(i,ScatteringLengths);
>> 240 }
230 } 241 }
231 242
232 //....oooOO0OOooo........oooOO0OOooo........oo << 243 // GetMeanFreePath()
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 244 // -----------------
234 const G4Material* material) const << 245 //
>> 246 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack,
>> 247 G4double ,
>> 248 G4ForceCondition* )
235 { 249 {
236 G4MaterialPropertiesTable* MPT = material->G << 250 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
>> 251 const G4Material* aMaterial = aTrack.GetMaterial();
>> 252
>> 253 G4double thePhotonEnergy = aParticle->GetTotalEnergy();
237 254
238 // Retrieve the beta_T or isothermal compres << 255 G4double AttenuationLength = DBL_MAX;
239 // compatibility use a constant if the mater <<
240 // doesn't have an ISOTHERMAL_COMPRESSIBILIT <<
241 G4double betat; <<
242 if(material->GetName() == "Water") <<
243 { <<
244 betat = 7.658e-23 * m3 / MeV; <<
245 } <<
246 else if(MPT->ConstPropertyExists(kISOTHERMAL <<
247 { <<
248 betat = MPT->GetConstProperty(kISOTHERMAL_ <<
249 } <<
250 else <<
251 { <<
252 return nullptr; <<
253 } <<
254 <<
255 // If the material doesn't have a RINDEX pro <<
256 G4MaterialPropertyVector* rIndex = MPT->GetP <<
257 if(rIndex == nullptr) <<
258 return nullptr; <<
259 <<
260 // Retrieve the optional scale factor (scale <<
261 G4double scaleFactor = 1.0; <<
262 if(MPT->ConstPropertyExists(kRS_SCALE_FACTOR <<
263 { <<
264 scaleFactor = MPT->GetConstProperty(kRS_SC <<
265 } <<
266 <<
267 // Retrieve the material temperature. For ba <<
268 // constant if the material is "Water" <<
269 G4double temperature; <<
270 if(material->GetName() == "Water") <<
271 { <<
272 temperature = <<
273 283.15 * kelvin; // Temperature of wate <<
274 } <<
275 else <<
276 { <<
277 temperature = material->GetTemperature(); <<
278 } <<
279 <<
280 auto rayleighMFPs = new G4PhysicsFreeVector( <<
281 // This calculates the meanFreePath via the <<
282 const G4double c1 = <<
283 scaleFactor * betat * temperature * k_Bolt <<
284 <<
285 for(size_t uRIndex = 0; uRIndex < rIndex->Ge <<
286 { <<
287 const G4double energy = rIndex->Ene <<
288 const G4double rIndexSquared = (*rIndex)[u <<
289 const G4double xlambda = h_Planck * <<
290 const G4double c2 = std::pow(tw <<
291 const G4double c3 = <<
292 std::pow(((rIndexSquared - 1.0) * (rInde <<
293 <<
294 const G4double meanFreePath = 1.0 / (c1 * <<
295 <<
296 if(verboseLevel > 0) <<
297 { <<
298 G4cout << energy << "MeV\t" << meanFreeP <<
299 } <<
300 256
301 rayleighMFPs->InsertValues(energy, meanFre << 257 if (aMaterial->GetName() == "Water" && DefaultWater){
302 } <<
303 258
304 return rayleighMFPs; << 259 G4bool isOutRange;
>> 260
>> 261 AttenuationLength =
>> 262 (*thePhysicsTable)(aMaterial->GetIndex())->
>> 263 GetValue(thePhotonEnergy, isOutRange);
>> 264 }
>> 265 else {
>> 266
>> 267 G4MaterialPropertiesTable* aMaterialPropertyTable =
>> 268 aMaterial->GetMaterialPropertiesTable();
>> 269
>> 270 if(aMaterialPropertyTable){
>> 271 G4MaterialPropertyVector* AttenuationLengthVector =
>> 272 aMaterialPropertyTable->GetProperty("RAYLEIGH");
>> 273 if(AttenuationLengthVector){
>> 274 AttenuationLength = AttenuationLengthVector ->
>> 275 GetProperty(thePhotonEnergy);
>> 276 }
>> 277 else{
>> 278 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 279 }
>> 280 }
>> 281 else{
>> 282 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 283 }
>> 284 }
>> 285
>> 286 return AttenuationLength;
305 } 287 }
306 288
307 //....oooOO0OOooo........oooOO0OOooo........oo << 289 // RayleighAttenuationLengthGenerator()
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo << 290 // ------------------------------------
>> 291 // Private method to compute Rayleigh Scattering Lengths (for water)
>> 292 //
>> 293 G4PhysicsOrderedFreeVector*
>> 294 G4OpRayleigh::RayleighAttenuationLengthGenerator(G4MaterialPropertiesTable *aMPT)
309 { 295 {
310 verboseLevel = verbose; << 296 // Physical Constants
311 G4OpticalParameters::Instance()->SetRayleigh << 297
>> 298 // isothermal compressibility of water
>> 299 G4double betat = 7.658e-23*m3/MeV;
>> 300
>> 301 // K Boltzman
>> 302 G4double kboltz = 8.61739e-11*MeV/kelvin;
>> 303
>> 304 // Temperature of water is 10 degrees celsius
>> 305 // conversion to kelvin:
>> 306 // TCelsius = TKelvin - 273.15 => 273.15 + 10 = 283.15
>> 307 G4double temp = 283.15*kelvin;
>> 308
>> 309 // Retrieve vectors for refraction index
>> 310 // and photon energy from the material properties table
>> 311
>> 312 G4MaterialPropertyVector* Rindex = aMPT->GetProperty("RINDEX");
>> 313
>> 314 G4double refsq;
>> 315 G4double e;
>> 316 G4double xlambda;
>> 317 G4double c1, c2, c3, c4;
>> 318 G4double Dist;
>> 319 G4double refraction_index;
>> 320
>> 321 G4PhysicsOrderedFreeVector *RayleighScatteringLengths =
>> 322 new G4PhysicsOrderedFreeVector();
>> 323
>> 324 if (Rindex ) {
>> 325
>> 326 Rindex->ResetIterator();
>> 327
>> 328 while (++(*Rindex)) {
>> 329
>> 330 e = (Rindex->GetPhotonEnergy());
>> 331
>> 332 refraction_index = Rindex->GetProperty();
>> 333 refsq = refraction_index*refraction_index;
>> 334 xlambda = h_Planck*c_light/e;
>> 335
>> 336 if (verboseLevel>0) {
>> 337 G4cout << Rindex->GetPhotonEnergy() << " MeV\t";
>> 338 G4cout << xlambda << " mm\t";
>> 339 }
>> 340
>> 341 c1 = 1 / (6.0 * pi);
>> 342 c2 = std::pow((2.0 * pi / xlambda), 4);
>> 343 c3 = std::pow( ( (refsq - 1.0) * (refsq + 2.0) / 3.0 ), 2);
>> 344 c4 = betat * temp * kboltz;
>> 345
>> 346 Dist = 1.0 / (c1*c2*c3*c4);
>> 347
>> 348 if (verboseLevel>0) {
>> 349 G4cout << Dist << " mm" << G4endl;
>> 350 }
>> 351 RayleighScatteringLengths->
>> 352 InsertValues(Rindex->GetPhotonEnergy(), Dist);
>> 353 }
>> 354
>> 355 }
>> 356
>> 357 return RayleighScatteringLengths;
312 } 358 }
313 359