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25 // 25 //
26 // 26 //
>> 27 // $Id: G4OpRayleigh.cc 71487 2013-06-17 08:19:40Z gcosmo $
27 // 28 //
28 // << 29 //
29 ////////////////////////////////////////////// 30 ////////////////////////////////////////////////////////////////////////
30 // Optical Photon Rayleigh Scattering Class Im 31 // Optical Photon Rayleigh Scattering Class Implementation
31 ////////////////////////////////////////////// 32 ////////////////////////////////////////////////////////////////////////
32 // 33 //
33 // File: G4OpRayleigh.cc << 34 // File: G4OpRayleigh.cc
34 // Description: Discrete Process -- Rayleigh s << 35 // Description: Discrete Process -- Rayleigh scattering of optical
35 // photons << 36 // photons
36 // Version: 1.0 37 // Version: 1.0
37 // Created: 1996-05-31 << 38 // Created: 1996-05-31
38 // Author: Juliet Armstrong 39 // Author: Juliet Armstrong
39 // Updated: 2014-10-10 - This version cal << 40 // Updated: 2010-06-11 - Fix Bug 207; Thanks to Xin Qian
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 41 // (Kellogg Radiation Lab of Caltech)
47 // 2005-07-28 - add G4ProcessType 42 // 2005-07-28 - add G4ProcessType to constructor
48 // 2001-10-18 by Peter Gumplinger 43 // 2001-10-18 by Peter Gumplinger
49 // eliminate unused variable warn 44 // eliminate unused variable warning on Linux (gcc-2.95.2)
50 // 2001-09-18 by mma 45 // 2001-09-18 by mma
51 // >numOfMaterials=G4Material::Ge << 46 // >numOfMaterials=G4Material::GetNumberOfMaterials() in BuildPhy
52 // 2001-01-30 by Peter Gumplinger 47 // 2001-01-30 by Peter Gumplinger
53 // > allow for positiv and negati 48 // > allow for positiv and negative CosTheta and force the
54 // > new momentum direction to be 49 // > new momentum direction to be in the same plane as the
55 // > new and old polarization vec 50 // > new and old polarization vectors
56 // 2001-01-29 by Peter Gumplinger 51 // 2001-01-29 by Peter Gumplinger
57 // > fix calculation of SinTheta 52 // > fix calculation of SinTheta (from CosTheta)
58 // 1997-04-09 by Peter Gumplinger 53 // 1997-04-09 by Peter Gumplinger
59 // > new physics/tracking scheme 54 // > new physics/tracking scheme
>> 55 // mail: gum@triumf.ca
60 // 56 //
61 ////////////////////////////////////////////// 57 ////////////////////////////////////////////////////////////////////////
62 58
63 #include "G4OpRayleigh.hh" 59 #include "G4OpRayleigh.hh"
>> 60
64 #include "G4ios.hh" 61 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" 62 #include "G4PhysicalConstants.hh"
66 #include "G4SystemOfUnits.hh" 63 #include "G4SystemOfUnits.hh"
67 #include "G4OpticalParameters.hh" <<
68 #include "G4OpProcessSubType.hh" 64 #include "G4OpProcessSubType.hh"
69 65
70 //....oooOO0OOooo........oooOO0OOooo........oo << 66 /////////////////////////
>> 67 // Class Implementation
>> 68 /////////////////////////
>> 69
>> 70 //////////////
>> 71 // Operators
>> 72 //////////////
>> 73
>> 74 // G4OpRayleigh::operator=(const G4OpRayleigh &right)
>> 75 // {
>> 76 // }
>> 77
>> 78 /////////////////
>> 79 // Constructors
>> 80 /////////////////
>> 81
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro 82 G4OpRayleigh::G4OpRayleigh(const G4String& processName, G4ProcessType type)
72 : G4VDiscreteProcess(processName, type) << 83 : G4VDiscreteProcess(processName, type)
73 { 84 {
74 Initialise(); << 85 SetProcessSubType(fOpRayleigh);
75 SetProcessSubType(fOpRayleigh); << 86
76 thePhysicsTable = nullptr; << 87 thePhysicsTable = NULL;
77 << 88
78 if(verboseLevel > 0) << 89 DefaultWater = false;
79 { << 90
80 G4cout << GetProcessName() << " is created << 91 if (verboseLevel>0) {
81 } << 92 G4cout << GetProcessName() << " is created " << G4endl;
>> 93 }
82 } 94 }
83 95
84 //....oooOO0OOooo........oooOO0OOooo........oo << 96 // G4OpRayleigh::G4OpRayleigh(const G4OpRayleigh &right)
>> 97 // {
>> 98 // }
>> 99
>> 100 ////////////////
>> 101 // Destructors
>> 102 ////////////////
>> 103
85 G4OpRayleigh::~G4OpRayleigh() 104 G4OpRayleigh::~G4OpRayleigh()
86 { 105 {
87 // VI: inside this PhysicsTable all properti << 106 if (thePhysicsTable!= NULL) {
88 // it is not possible to destroy << 107 thePhysicsTable->clearAndDestroy();
89 delete thePhysicsTable; << 108 delete thePhysicsTable;
>> 109 }
90 } 110 }
91 111
92 //....oooOO0OOooo........oooOO0OOooo........oo << 112 ////////////
93 void G4OpRayleigh::PreparePhysicsTable(const G << 113 // Methods
94 { << 114 ////////////
95 Initialise(); <<
96 } <<
97 115
98 //....oooOO0OOooo........oooOO0OOooo........oo << 116 void G4OpRayleigh::BuildPhysicsTable(const G4ParticleDefinition&)
99 void G4OpRayleigh::Initialise() <<
100 { 117 {
101 SetVerboseLevel(G4OpticalParameters::Instanc << 118 if (!thePhysicsTable) BuildThePhysicsTable();
102 } 119 }
103 120
104 //....oooOO0OOooo........oooOO0OOooo........oo << 121 // PostStepDoIt
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( << 122 // -------------
106 << 123 //
>> 124 G4VParticleChange*
>> 125 G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
107 { 126 {
108 aParticleChange.Initialize(aTrack); << 127 aParticleChange.Initialize(aTrack);
109 const G4DynamicParticle* aParticle = aTrack. <<
110 128
111 if(verboseLevel > 1) << 129 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
112 { <<
113 G4cout << "OpRayleigh: Scattering Photon!" <<
114 << "Old Momentum Direction: " << aP <<
115 << G4endl << "Old Polarization: " < <<
116 << G4endl; <<
117 } <<
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 } <<
183 130
184 return G4VDiscreteProcess::PostStepDoIt(aTra << 131 if (verboseLevel>0) {
185 } << 132 G4cout << "Scattering Photon!" << G4endl;
>> 133 G4cout << "Old Momentum Direction: "
>> 134 << aParticle->GetMomentumDirection() << G4endl;
>> 135 G4cout << "Old Polarization: "
>> 136 << aParticle->GetPolarization() << G4endl;
>> 137 }
>> 138
>> 139 G4double cosTheta;
>> 140 G4ThreeVector OldMomentumDirection, NewMomentumDirection;
>> 141 G4ThreeVector OldPolarization, NewPolarization;
>> 142
>> 143 do {
>> 144 // Try to simulate the scattered photon momentum direction
>> 145 // w.r.t. the initial photon momentum direction
>> 146
>> 147 G4double CosTheta = G4UniformRand();
>> 148 G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
>> 149 // consider for the angle 90-180 degrees
>> 150 if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
>> 151
>> 152 // simulate the phi angle
>> 153 G4double rand = twopi*G4UniformRand();
>> 154 G4double SinPhi = std::sin(rand);
>> 155 G4double CosPhi = std::cos(rand);
>> 156
>> 157 // start constructing the new momentum direction
>> 158 G4double unit_x = SinTheta * CosPhi;
>> 159 G4double unit_y = SinTheta * SinPhi;
>> 160 G4double unit_z = CosTheta;
>> 161 NewMomentumDirection.set (unit_x,unit_y,unit_z);
>> 162
>> 163 // Rotate the new momentum direction into global reference system
>> 164 OldMomentumDirection = aParticle->GetMomentumDirection();
>> 165 OldMomentumDirection = OldMomentumDirection.unit();
>> 166 NewMomentumDirection.rotateUz(OldMomentumDirection);
>> 167 NewMomentumDirection = NewMomentumDirection.unit();
>> 168
>> 169 // calculate the new polarization direction
>> 170 // The new polarization needs to be in the same plane as the new
>> 171 // momentum direction and the old polarization direction
>> 172 OldPolarization = aParticle->GetPolarization();
>> 173 G4double constant = -1./NewMomentumDirection.dot(OldPolarization);
>> 174
>> 175 NewPolarization = NewMomentumDirection + constant*OldPolarization;
>> 176 NewPolarization = NewPolarization.unit();
>> 177
>> 178 // There is a corner case, where the Newmomentum direction
>> 179 // is the same as oldpolariztion direction:
>> 180 // random generate the azimuthal angle w.r.t. Newmomentum direction
>> 181 if (NewPolarization.mag() == 0.) {
>> 182 rand = G4UniformRand()*twopi;
>> 183 NewPolarization.set(std::cos(rand),std::sin(rand),0.);
>> 184 NewPolarization.rotateUz(NewMomentumDirection);
>> 185 } else {
>> 186 // There are two directions which are perpendicular
>> 187 // to the new momentum direction
>> 188 if (G4UniformRand() < 0.5) NewPolarization = -NewPolarization;
>> 189 }
>> 190
>> 191 // simulate according to the distribution cos^2(theta)
>> 192 cosTheta = NewPolarization.dot(OldPolarization);
>> 193 } while (std::pow(cosTheta,2) < G4UniformRand());
>> 194
>> 195 aParticleChange.ProposePolarization(NewPolarization);
>> 196 aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
>> 197
>> 198 if (verboseLevel>0) {
>> 199 G4cout << "New Polarization: "
>> 200 << NewPolarization << G4endl;
>> 201 G4cout << "Polarization Change: "
>> 202 << *(aParticleChange.GetPolarization()) << G4endl;
>> 203 G4cout << "New Momentum Direction: "
>> 204 << NewMomentumDirection << G4endl;
>> 205 G4cout << "Momentum Change: "
>> 206 << *(aParticleChange.GetMomentumDirection()) << G4endl;
>> 207 }
186 208
187 //....oooOO0OOooo........oooOO0OOooo........oo << 209 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
188 void G4OpRayleigh::BuildPhysicsTable(const G4P <<
189 { <<
190 if(thePhysicsTable) <<
191 { <<
192 // thePhysicsTable->clearAndDestroy(); <<
193 delete thePhysicsTable; <<
194 thePhysicsTable = nullptr; <<
195 } <<
196 <<
197 const G4MaterialTable* theMaterialTable = G4 <<
198 const size_t numOfMaterials = G4 <<
199 thePhysicsTable = ne <<
200 <<
201 for(size_t i = 0; i < numOfMaterials; ++i) <<
202 { <<
203 G4Material* material = (*the <<
204 G4MaterialPropertiesTable* matProp = mater <<
205 G4PhysicsFreeVector* rayleigh = nullptr; <<
206 if(matProp) <<
207 { <<
208 rayleigh = matProp->GetProperty(kRAYLEIG <<
209 if(rayleigh == nullptr) <<
210 rayleigh = CalculateRayleighMeanFreePa <<
211 } <<
212 thePhysicsTable->insertAt(i, rayleigh); <<
213 } <<
214 } 210 }
215 211
216 //....oooOO0OOooo........oooOO0OOooo........oo << 212 // BuildThePhysicsTable for the Rayleigh Scattering process
217 G4double G4OpRayleigh::GetMeanFreePath(const G << 213 // --------------------------------------------------------
218 G4Force << 214 //
>> 215 void G4OpRayleigh::BuildThePhysicsTable()
219 { 216 {
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 217 // Builds a table of scattering lengths for each material
221 (*thePhysicsTable)(aTrack.GetMaterial()- << 218
>> 219 if (thePhysicsTable) return;
>> 220
>> 221 const G4MaterialTable* theMaterialTable=
>> 222 G4Material::GetMaterialTable();
>> 223 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
>> 224
>> 225 // create a new physics table
>> 226
>> 227 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 228
>> 229 // loop for materials
>> 230
>> 231 for (G4int i=0 ; i < numOfMaterials; i++)
>> 232 {
>> 233 G4PhysicsOrderedFreeVector* ScatteringLengths = NULL;
>> 234
>> 235 G4MaterialPropertiesTable *aMaterialPropertiesTable =
>> 236 (*theMaterialTable)[i]->GetMaterialPropertiesTable();
>> 237
>> 238 if(aMaterialPropertiesTable){
>> 239
>> 240 G4MaterialPropertyVector* AttenuationLengthVector =
>> 241 aMaterialPropertiesTable->GetProperty("RAYLEIGH");
>> 242
>> 243 if(!AttenuationLengthVector){
>> 244
>> 245 if ((*theMaterialTable)[i]->GetName() == "Water")
>> 246 {
>> 247 // Call utility routine to Generate
>> 248 // Rayleigh Scattering Lengths
222 249
223 G4double rsLength = DBL_MAX; << 250 DefaultWater = true;
224 if(rayleigh) << 251
225 { << 252 ScatteringLengths =
226 rsLength = rayleigh->Value(aTrack.GetDynam << 253 RayleighAttenuationLengthGenerator(aMaterialPropertiesTable);
227 idx_rslength); << 254 }
228 } << 255 }
229 return rsLength; << 256 }
>> 257
>> 258 thePhysicsTable->insertAt(i,ScatteringLengths);
>> 259 }
230 } 260 }
231 261
232 //....oooOO0OOooo........oooOO0OOooo........oo << 262 // GetMeanFreePath()
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 263 // -----------------
234 const G4Material* material) const << 264 //
>> 265 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack,
>> 266 G4double ,
>> 267 G4ForceCondition* )
235 { 268 {
236 G4MaterialPropertiesTable* MPT = material->G << 269 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
>> 270 const G4Material* aMaterial = aTrack.GetMaterial();
237 271
238 // Retrieve the beta_T or isothermal compres << 272 G4double thePhotonEnergy = aParticle->GetTotalEnergy();
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 } <<
300 273
301 rayleighMFPs->InsertValues(energy, meanFre << 274 G4double AttenuationLength = DBL_MAX;
302 } <<
303 275
304 return rayleighMFPs; << 276 if (aMaterial->GetName() == "Water" && DefaultWater){
>> 277
>> 278 G4bool isOutRange;
>> 279
>> 280 AttenuationLength =
>> 281 (*thePhysicsTable)(aMaterial->GetIndex())->
>> 282 GetValue(thePhotonEnergy, isOutRange);
>> 283 }
>> 284 else {
>> 285
>> 286 G4MaterialPropertiesTable* aMaterialPropertyTable =
>> 287 aMaterial->GetMaterialPropertiesTable();
>> 288
>> 289 if(aMaterialPropertyTable){
>> 290 G4MaterialPropertyVector* AttenuationLengthVector =
>> 291 aMaterialPropertyTable->GetProperty("RAYLEIGH");
>> 292 if(AttenuationLengthVector){
>> 293 AttenuationLength = AttenuationLengthVector ->
>> 294 Value(thePhotonEnergy);
>> 295 }
>> 296 else{
>> 297 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 298 }
>> 299 }
>> 300 else{
>> 301 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 302 }
>> 303 }
>> 304
>> 305 return AttenuationLength;
305 } 306 }
306 307
307 //....oooOO0OOooo........oooOO0OOooo........oo << 308 // RayleighAttenuationLengthGenerator()
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo << 309 // ------------------------------------
>> 310 // Private method to compute Rayleigh Scattering Lengths (for water)
>> 311 //
>> 312 G4PhysicsOrderedFreeVector*
>> 313 G4OpRayleigh::RayleighAttenuationLengthGenerator(G4MaterialPropertiesTable *aMPT)
309 { 314 {
310 verboseLevel = verbose; << 315 // Physical Constants
311 G4OpticalParameters::Instance()->SetRayleigh << 316
>> 317 // isothermal compressibility of water
>> 318 G4double betat = 7.658e-23*m3/MeV;
>> 319
>> 320 // K Boltzman
>> 321 G4double kboltz = 8.61739e-11*MeV/kelvin;
>> 322
>> 323 // Temperature of water is 10 degrees celsius
>> 324 // conversion to kelvin:
>> 325 // TCelsius = TKelvin - 273.15 => 273.15 + 10 = 283.15
>> 326 G4double temp = 283.15*kelvin;
>> 327
>> 328 // Retrieve vectors for refraction index
>> 329 // and photon energy from the material properties table
>> 330
>> 331 G4MaterialPropertyVector* Rindex = aMPT->GetProperty("RINDEX");
>> 332
>> 333 G4double refsq;
>> 334 G4double e;
>> 335 G4double xlambda;
>> 336 G4double c1, c2, c3, c4;
>> 337 G4double Dist;
>> 338 G4double refraction_index;
>> 339
>> 340 G4PhysicsOrderedFreeVector *RayleighScatteringLengths =
>> 341 new G4PhysicsOrderedFreeVector();
>> 342
>> 343 if (Rindex ) {
>> 344
>> 345 for (size_t i = 0; i < Rindex->GetVectorLength(); i++) {
>> 346
>> 347 e = Rindex->Energy(i);
>> 348
>> 349 refraction_index = (*Rindex)[i];
>> 350
>> 351 refsq = refraction_index*refraction_index;
>> 352 xlambda = h_Planck*c_light/e;
>> 353
>> 354 if (verboseLevel>0) {
>> 355 G4cout << Rindex->Energy(i) << " MeV\t";
>> 356 G4cout << xlambda << " mm\t";
>> 357 }
>> 358
>> 359 c1 = 1 / (6.0 * pi);
>> 360 c2 = std::pow((2.0 * pi / xlambda), 4);
>> 361 c3 = std::pow( ( (refsq - 1.0) * (refsq + 2.0) / 3.0 ), 2);
>> 362 c4 = betat * temp * kboltz;
>> 363
>> 364 Dist = 1.0 / (c1*c2*c3*c4);
>> 365
>> 366 if (verboseLevel>0) {
>> 367 G4cout << Dist << " mm" << G4endl;
>> 368 }
>> 369 RayleighScatteringLengths->
>> 370 InsertValues(Rindex->Energy(i), Dist);
>> 371 }
>> 372
>> 373 }
>> 374
>> 375 return RayleighScatteringLengths;
312 } 376 }
313 377