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25 // 25 //
26 // 26 //
>> 27 // $Id: G4OpRayleigh.cc,v 1.19 2010-10-29 23:18:35 gum Exp $
>> 28 // GEANT4 tag $Name: not supported by cvs2svn $
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: 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 42 // (Kellogg Radiation Lab of Caltech)
47 // 2005-07-28 - add G4ProcessType 43 // 2005-07-28 - add G4ProcessType to constructor
48 // 2001-10-18 by Peter Gumplinger 44 // 2001-10-18 by Peter Gumplinger
49 // eliminate unused variable warn 45 // eliminate unused variable warning on Linux (gcc-2.95.2)
50 // 2001-09-18 by mma 46 // 2001-09-18 by mma
51 // >numOfMaterials=G4Material::Ge << 47 // >numOfMaterials=G4Material::GetNumberOfMaterials() in BuildPhy
52 // 2001-01-30 by Peter Gumplinger 48 // 2001-01-30 by Peter Gumplinger
53 // > allow for positiv and negati 49 // > allow for positiv and negative CosTheta and force the
54 // > new momentum direction to be 50 // > new momentum direction to be in the same plane as the
55 // > new and old polarization vec 51 // > new and old polarization vectors
56 // 2001-01-29 by Peter Gumplinger 52 // 2001-01-29 by Peter Gumplinger
57 // > fix calculation of SinTheta 53 // > fix calculation of SinTheta (from CosTheta)
58 // 1997-04-09 by Peter Gumplinger 54 // 1997-04-09 by Peter Gumplinger
59 // > new physics/tracking scheme 55 // > new physics/tracking scheme
>> 56 // mail: gum@triumf.ca
60 // 57 //
61 ////////////////////////////////////////////// 58 ////////////////////////////////////////////////////////////////////////
62 59
63 #include "G4OpRayleigh.hh" <<
64 #include "G4ios.hh" 60 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" <<
66 #include "G4SystemOfUnits.hh" <<
67 #include "G4OpticalParameters.hh" <<
68 #include "G4OpProcessSubType.hh" 61 #include "G4OpProcessSubType.hh"
69 62
70 //....oooOO0OOooo........oooOO0OOooo........oo << 63 #include "G4OpRayleigh.hh"
>> 64
>> 65 /////////////////////////
>> 66 // Class Implementation
>> 67 /////////////////////////
>> 68
>> 69 //////////////
>> 70 // Operators
>> 71 //////////////
>> 72
>> 73 // G4OpRayleigh::operator=(const G4OpRayleigh &right)
>> 74 // {
>> 75 // }
>> 76
>> 77 /////////////////
>> 78 // Constructors
>> 79 /////////////////
>> 80
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro 81 G4OpRayleigh::G4OpRayleigh(const G4String& processName, G4ProcessType type)
72 : G4VDiscreteProcess(processName, type) << 82 : G4VDiscreteProcess(processName, type)
73 { 83 {
74 Initialise(); << 84 SetProcessSubType(fOpRayleigh);
75 SetProcessSubType(fOpRayleigh); << 85
76 thePhysicsTable = nullptr; << 86 thePhysicsTable = 0;
77 << 87
78 if(verboseLevel > 0) << 88 DefaultWater = false;
79 { << 89
80 G4cout << GetProcessName() << " is created << 90 if (verboseLevel>0) {
81 } << 91 G4cout << GetProcessName() << " is created " << G4endl;
>> 92 }
>> 93
>> 94 BuildThePhysicsTable();
82 } 95 }
83 96
84 //....oooOO0OOooo........oooOO0OOooo........oo << 97 // G4OpRayleigh::G4OpRayleigh(const G4OpRayleigh &right)
>> 98 // {
>> 99 // }
>> 100
>> 101 ////////////////
>> 102 // Destructors
>> 103 ////////////////
>> 104
85 G4OpRayleigh::~G4OpRayleigh() 105 G4OpRayleigh::~G4OpRayleigh()
86 { 106 {
87 // VI: inside this PhysicsTable all properti << 107 if (thePhysicsTable!= 0) {
88 // it is not possible to destroy << 108 thePhysicsTable->clearAndDestroy();
89 delete thePhysicsTable; << 109 delete thePhysicsTable;
>> 110 }
90 } 111 }
91 112
92 //....oooOO0OOooo........oooOO0OOooo........oo << 113 ////////////
93 void G4OpRayleigh::PreparePhysicsTable(const G << 114 // Methods
94 { << 115 ////////////
95 Initialise(); <<
96 } <<
97 116
98 //....oooOO0OOooo........oooOO0OOooo........oo << 117 // PostStepDoIt
99 void G4OpRayleigh::Initialise() << 118 // -------------
>> 119 //
>> 120 G4VParticleChange*
>> 121 G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
100 { 122 {
101 SetVerboseLevel(G4OpticalParameters::Instanc << 123 aParticleChange.Initialize(aTrack);
102 } <<
103 124
104 //....oooOO0OOooo........oooOO0OOooo........oo << 125 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( <<
106 <<
107 { <<
108 aParticleChange.Initialize(aTrack); <<
109 const G4DynamicParticle* aParticle = aTrack. <<
110 126
111 if(verboseLevel > 1) << 127 if (verboseLevel>0) {
112 { << 128 G4cout << "Scattering Photon!" << G4endl;
113 G4cout << "OpRayleigh: Scattering Photon!" << 129 G4cout << "Old Momentum Direction: "
114 << "Old Momentum Direction: " << aP << 130 << aParticle->GetMomentumDirection() << G4endl;
115 << G4endl << "Old Polarization: " < << 131 G4cout << "Old Polarization: "
116 << G4endl; << 132 << aParticle->GetPolarization() << G4endl;
117 } << 133 }
118 << 134
119 G4double cosTheta; << 135 G4double cosTheta;
120 G4ThreeVector oldMomDir, newMomDir; << 136 G4ThreeVector OldMomentumDirection, NewMomentumDirection;
121 G4ThreeVector oldPol, newPol; << 137 G4ThreeVector OldPolarization, NewPolarization;
122 G4double rand; << 138
123 G4double cost, sint, sinphi, cosphi; << 139 do {
124 << 140 // Try to simulate the scattered photon momentum direction
125 do << 141 // w.r.t. the initial photon momentum direction
126 { << 142
127 // Try to simulate the scattered photon mo << 143 G4double CosTheta = G4UniformRand();
128 // w.r.t. the initial photon momentum dire << 144 G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
129 cost = G4UniformRand(); << 145 // consider for the angle 90-180 degrees
130 sint = std::sqrt(1. - cost * cost); << 146 if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
131 // consider for the angle 90-180 degrees << 147
132 if(G4UniformRand() < 0.5) << 148 // simulate the phi angle
133 cost = -cost; << 149 G4double rand = twopi*G4UniformRand();
134 << 150 G4double SinPhi = std::sin(rand);
135 // simulate the phi angle << 151 G4double CosPhi = std::cos(rand);
136 rand = twopi * G4UniformRand(); << 152
137 sinphi = std::sin(rand); << 153 // start constructing the new momentum direction
138 cosphi = std::cos(rand); << 154 G4double unit_x = SinTheta * CosPhi;
139 << 155 G4double unit_y = SinTheta * SinPhi;
140 // construct the new momentum direction << 156 G4double unit_z = CosTheta;
141 newMomDir.set(sint * cosphi, sint * sinphi << 157 NewMomentumDirection.set (unit_x,unit_y,unit_z);
142 oldMomDir = aParticle->GetMomentumDirectio << 158
143 newMomDir.rotateUz(oldMomDir); << 159 // Rotate the new momentum direction into global reference system
144 << 160 OldMomentumDirection = aParticle->GetMomentumDirection();
145 // calculate the new polarization directio << 161 OldMomentumDirection = OldMomentumDirection.unit();
146 // The new polarization needs to be in the << 162 NewMomentumDirection.rotateUz(OldMomentumDirection);
147 // momentum direction and the old polariza << 163 NewMomentumDirection = NewMomentumDirection.unit();
148 oldPol = aParticle->GetPolarization(); << 164
149 newPol = (oldPol - newMomDir.dot(oldPol) * << 165 // calculate the new polarization direction
150 << 166 // The new polarization needs to be in the same plane as the new
151 // There is a corner case, where the new m << 167 // momentum direction and the old polarization direction
152 // is the same as old polarization directi << 168 OldPolarization = aParticle->GetPolarization();
153 // random generate the azimuthal angle w.r << 169 G4double constant = -1./NewMomentumDirection.dot(OldPolarization);
154 if(newPol.mag() == 0.) << 170
155 { << 171 NewPolarization = NewMomentumDirection + constant*OldPolarization;
156 rand = G4UniformRand() * twopi; << 172 NewPolarization = NewPolarization.unit();
157 newPol.set(std::cos(rand), std::sin(rand << 173
158 newPol.rotateUz(newMomDir); << 174 // There is a corner case, where the Newmomentum direction
159 } << 175 // is the same as oldpolariztion direction:
160 else << 176 // random generate the azimuthal angle w.r.t. Newmomentum direction
161 { << 177 if (NewPolarization.mag() == 0.) {
162 // There are two directions perpendicula << 178 rand = G4UniformRand()*twopi;
163 if(G4UniformRand() < 0.5) << 179 NewPolarization.set(std::cos(rand),std::sin(rand),0.);
164 newPol = -newPol; << 180 NewPolarization.rotateUz(NewMomentumDirection);
165 } << 181 } else {
166 << 182 // There are two directions which are perpendicular
167 // simulate according to the distribution << 183 // to the new momentum direction
168 cosTheta = newPol.dot(oldPol); << 184 if (G4UniformRand() < 0.5) NewPolarization = -NewPolarization;
169 // Loop checking, 13-Aug-2015, Peter Gumpl << 185 }
170 } while(std::pow(cosTheta, 2) < G4UniformRan << 186
171 << 187 // simulate according to the distribution cos^2(theta)
172 aParticleChange.ProposePolarization(newPol); << 188 cosTheta = NewPolarization.dot(OldPolarization);
173 aParticleChange.ProposeMomentumDirection(new << 189 } while (std::pow(cosTheta,2) < G4UniformRand());
174 << 190
175 if(verboseLevel > 1) << 191 aParticleChange.ProposePolarization(NewPolarization);
176 { << 192 aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
177 G4cout << "New Polarization: " << newPol < << 193
178 << "Polarization Change: " << *(aPa << 194 if (verboseLevel>0) {
179 << G4endl << "New Momentum Directio << 195 G4cout << "New Polarization: "
180 << "Momentum Change: " << *(aPartic << 196 << NewPolarization << G4endl;
181 << G4endl; << 197 G4cout << "Polarization Change: "
182 } << 198 << *(aParticleChange.GetPolarization()) << G4endl;
>> 199 G4cout << "New Momentum Direction: "
>> 200 << NewMomentumDirection << G4endl;
>> 201 G4cout << "Momentum Change: "
>> 202 << *(aParticleChange.GetMomentumDirection()) << G4endl;
>> 203 }
183 204
184 return G4VDiscreteProcess::PostStepDoIt(aTra << 205 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
185 } 206 }
186 207
187 //....oooOO0OOooo........oooOO0OOooo........oo << 208 // BuildThePhysicsTable for the Rayleigh Scattering process
188 void G4OpRayleigh::BuildPhysicsTable(const G4P << 209 // --------------------------------------------------------
>> 210 //
>> 211 void G4OpRayleigh::BuildThePhysicsTable()
189 { 212 {
190 if(thePhysicsTable) << 213 // Builds a table of scattering lengths for each material
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 } <<
215 214
216 //....oooOO0OOooo........oooOO0OOooo........oo << 215 if (thePhysicsTable) return;
217 G4double G4OpRayleigh::GetMeanFreePath(const G << 216
218 G4Force << 217 const G4MaterialTable* theMaterialTable=
219 { << 218 G4Material::GetMaterialTable();
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 219 G4int numOfMaterials = G4Material::GetNumberOfMaterials();
221 (*thePhysicsTable)(aTrack.GetMaterial()- << 220
>> 221 // create a new physics table
>> 222
>> 223 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 224
>> 225 // loop for materials
>> 226
>> 227 for (G4int i=0 ; i < numOfMaterials; i++)
>> 228 {
>> 229 G4PhysicsOrderedFreeVector* ScatteringLengths = NULL;
>> 230
>> 231 G4MaterialPropertiesTable *aMaterialPropertiesTable =
>> 232 (*theMaterialTable)[i]->GetMaterialPropertiesTable();
>> 233
>> 234 if(aMaterialPropertiesTable){
>> 235
>> 236 G4MaterialPropertyVector* AttenuationLengthVector =
>> 237 aMaterialPropertiesTable->GetProperty("RAYLEIGH");
>> 238
>> 239 if(!AttenuationLengthVector){
222 240
223 G4double rsLength = DBL_MAX; << 241 if ((*theMaterialTable)[i]->GetName() == "Water")
224 if(rayleigh) << 242 {
225 { << 243 // Call utility routine to Generate
226 rsLength = rayleigh->Value(aTrack.GetDynam << 244 // Rayleigh Scattering Lengths
227 idx_rslength); << 245
228 } << 246 DefaultWater = true;
229 return rsLength; << 247
>> 248 ScatteringLengths =
>> 249 RayleighAttenuationLengthGenerator(aMaterialPropertiesTable);
>> 250 }
>> 251 }
>> 252 }
>> 253
>> 254 thePhysicsTable->insertAt(i,ScatteringLengths);
>> 255 }
230 } 256 }
231 257
232 //....oooOO0OOooo........oooOO0OOooo........oo << 258 // GetMeanFreePath()
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 259 // -----------------
234 const G4Material* material) const << 260 //
>> 261 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack,
>> 262 G4double ,
>> 263 G4ForceCondition* )
235 { 264 {
236 G4MaterialPropertiesTable* MPT = material->G << 265 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
>> 266 const G4Material* aMaterial = aTrack.GetMaterial();
237 267
238 // Retrieve the beta_T or isothermal compres << 268 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 } <<
300 269
301 rayleighMFPs->InsertValues(energy, meanFre << 270 G4double AttenuationLength = DBL_MAX;
302 } <<
303 271
304 return rayleighMFPs; << 272 if (aMaterial->GetName() == "Water" && DefaultWater){
>> 273
>> 274 G4bool isOutRange;
>> 275
>> 276 AttenuationLength =
>> 277 (*thePhysicsTable)(aMaterial->GetIndex())->
>> 278 GetValue(thePhotonEnergy, isOutRange);
>> 279 }
>> 280 else {
>> 281
>> 282 G4MaterialPropertiesTable* aMaterialPropertyTable =
>> 283 aMaterial->GetMaterialPropertiesTable();
>> 284
>> 285 if(aMaterialPropertyTable){
>> 286 G4MaterialPropertyVector* AttenuationLengthVector =
>> 287 aMaterialPropertyTable->GetProperty("RAYLEIGH");
>> 288 if(AttenuationLengthVector){
>> 289 AttenuationLength = AttenuationLengthVector ->
>> 290 Value(thePhotonEnergy);
>> 291 }
>> 292 else{
>> 293 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 294 }
>> 295 }
>> 296 else{
>> 297 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 298 }
>> 299 }
>> 300
>> 301 return AttenuationLength;
305 } 302 }
306 303
307 //....oooOO0OOooo........oooOO0OOooo........oo << 304 // RayleighAttenuationLengthGenerator()
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo << 305 // ------------------------------------
>> 306 // Private method to compute Rayleigh Scattering Lengths (for water)
>> 307 //
>> 308 G4PhysicsOrderedFreeVector*
>> 309 G4OpRayleigh::RayleighAttenuationLengthGenerator(G4MaterialPropertiesTable *aMPT)
309 { 310 {
310 verboseLevel = verbose; << 311 // Physical Constants
311 G4OpticalParameters::Instance()->SetRayleigh << 312
>> 313 // isothermal compressibility of water
>> 314 G4double betat = 7.658e-23*m3/MeV;
>> 315
>> 316 // K Boltzman
>> 317 G4double kboltz = 8.61739e-11*MeV/kelvin;
>> 318
>> 319 // Temperature of water is 10 degrees celsius
>> 320 // conversion to kelvin:
>> 321 // TCelsius = TKelvin - 273.15 => 273.15 + 10 = 283.15
>> 322 G4double temp = 283.15*kelvin;
>> 323
>> 324 // Retrieve vectors for refraction index
>> 325 // and photon energy from the material properties table
>> 326
>> 327 G4MaterialPropertyVector* Rindex = aMPT->GetProperty("RINDEX");
>> 328
>> 329 G4double refsq;
>> 330 G4double e;
>> 331 G4double xlambda;
>> 332 G4double c1, c2, c3, c4;
>> 333 G4double Dist;
>> 334 G4double refraction_index;
>> 335
>> 336 G4PhysicsOrderedFreeVector *RayleighScatteringLengths =
>> 337 new G4PhysicsOrderedFreeVector();
>> 338
>> 339 if (Rindex ) {
>> 340
>> 341 for (size_t i = 0; i < Rindex->GetVectorLength(); i++) {
>> 342
>> 343 e = Rindex->Energy(i);
>> 344
>> 345 refraction_index = (*Rindex)[i];
>> 346
>> 347 refsq = refraction_index*refraction_index;
>> 348 xlambda = h_Planck*c_light/e;
>> 349
>> 350 if (verboseLevel>0) {
>> 351 G4cout << Rindex->Energy(i) << " MeV\t";
>> 352 G4cout << xlambda << " mm\t";
>> 353 }
>> 354
>> 355 c1 = 1 / (6.0 * pi);
>> 356 c2 = std::pow((2.0 * pi / xlambda), 4);
>> 357 c3 = std::pow( ( (refsq - 1.0) * (refsq + 2.0) / 3.0 ), 2);
>> 358 c4 = betat * temp * kboltz;
>> 359
>> 360 Dist = 1.0 / (c1*c2*c3*c4);
>> 361
>> 362 if (verboseLevel>0) {
>> 363 G4cout << Dist << " mm" << G4endl;
>> 364 }
>> 365 RayleighScatteringLengths->
>> 366 InsertValues(Rindex->Energy(i), Dist);
>> 367 }
>> 368
>> 369 }
>> 370
>> 371 return RayleighScatteringLengths;
312 } 372 }
313 373