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26 // 26 //
27 // 27 //
28 // 28 //
29 ////////////////////////////////////////////// 29 ////////////////////////////////////////////////////////////////////////
30 // Optical Photon Rayleigh Scattering Class Im 30 // Optical Photon Rayleigh Scattering Class Implementation
31 ////////////////////////////////////////////// 31 ////////////////////////////////////////////////////////////////////////
32 // 32 //
33 // File: G4OpRayleigh.cc 33 // File: G4OpRayleigh.cc
34 // Description: Discrete Process -- Rayleigh s 34 // Description: Discrete Process -- Rayleigh scattering of optical
35 // photons 35 // photons
36 // Version: 1.0 36 // Version: 1.0
37 // Created: 1996-05-31 37 // Created: 1996-05-31
38 // Author: Juliet Armstrong 38 // Author: Juliet Armstrong
39 // Updated: 2014-10-10 - This version cal 39 // Updated: 2014-10-10 - This version calculates the Rayleigh scattering
40 // length for more materials than 40 // length for more materials than just Water (although the Water
41 // default is kept). To do this t 41 // default is kept). To do this the user would need to specify the
42 // ISOTHERMAL_COMPRESSIBILITY as 42 // ISOTHERMAL_COMPRESSIBILITY as a material property and
43 // optionally an RS_SCALE_LENGTH 43 // optionally an RS_SCALE_LENGTH (useful for testing). Code comes
44 // from Philip Graham (Queen Mary 44 // from Philip Graham (Queen Mary University of London).
45 // 2010-06-11 - Fix Bug 207; Than 45 // 2010-06-11 - Fix Bug 207; Thanks to Xin Qian
46 // (Kellogg Radiation Lab of Calt 46 // (Kellogg Radiation Lab of Caltech)
47 // 2005-07-28 - add G4ProcessType 47 // 2005-07-28 - add G4ProcessType to constructor
48 // 2001-10-18 by Peter Gumplinger 48 // 2001-10-18 by Peter Gumplinger
49 // eliminate unused variable warn 49 // eliminate unused variable warning on Linux (gcc-2.95.2)
50 // 2001-09-18 by mma 50 // 2001-09-18 by mma
51 // >numOfMaterials=G4Material::Ge 51 // >numOfMaterials=G4Material::GetNumberOfMaterials() in BuildPhy
52 // 2001-01-30 by Peter Gumplinger 52 // 2001-01-30 by Peter Gumplinger
53 // > allow for positiv and negati 53 // > allow for positiv and negative CosTheta and force the
54 // > new momentum direction to be 54 // > new momentum direction to be in the same plane as the
55 // > new and old polarization vec 55 // > new and old polarization vectors
56 // 2001-01-29 by Peter Gumplinger 56 // 2001-01-29 by Peter Gumplinger
57 // > fix calculation of SinTheta 57 // > fix calculation of SinTheta (from CosTheta)
58 // 1997-04-09 by Peter Gumplinger 58 // 1997-04-09 by Peter Gumplinger
59 // > new physics/tracking scheme 59 // > new physics/tracking scheme
60 // 60 //
61 ////////////////////////////////////////////// 61 ////////////////////////////////////////////////////////////////////////
62 62
63 #include "G4OpRayleigh.hh" 63 #include "G4OpRayleigh.hh"
64 #include "G4ios.hh" 64 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" 65 #include "G4PhysicalConstants.hh"
66 #include "G4SystemOfUnits.hh" 66 #include "G4SystemOfUnits.hh"
67 #include "G4OpticalParameters.hh" 67 #include "G4OpticalParameters.hh"
68 #include "G4OpProcessSubType.hh" 68 #include "G4OpProcessSubType.hh"
69 69
70 //....oooOO0OOooo........oooOO0OOooo........oo 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro 71 G4OpRayleigh::G4OpRayleigh(const G4String& processName, G4ProcessType type)
72 : G4VDiscreteProcess(processName, type) 72 : G4VDiscreteProcess(processName, type)
73 { 73 {
74 Initialise(); 74 Initialise();
75 SetProcessSubType(fOpRayleigh); 75 SetProcessSubType(fOpRayleigh);
76 thePhysicsTable = nullptr; 76 thePhysicsTable = nullptr;
77 77
78 if(verboseLevel > 0) 78 if(verboseLevel > 0)
79 { 79 {
80 G4cout << GetProcessName() << " is created 80 G4cout << GetProcessName() << " is created " << G4endl;
81 } 81 }
82 } 82 }
83 83
84 //....oooOO0OOooo........oooOO0OOooo........oo 84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
85 G4OpRayleigh::~G4OpRayleigh() 85 G4OpRayleigh::~G4OpRayleigh()
86 { 86 {
87 // VI: inside this PhysicsTable all properti 87 // VI: inside this PhysicsTable all properties are unique
88 // it is not possible to destroy 88 // it is not possible to destroy
89 delete thePhysicsTable; << 89 if(thePhysicsTable)
>> 90 {
>> 91 delete thePhysicsTable;
>> 92 }
90 } 93 }
91 94
92 //....oooOO0OOooo........oooOO0OOooo........oo 95 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93 void G4OpRayleigh::PreparePhysicsTable(const G 96 void G4OpRayleigh::PreparePhysicsTable(const G4ParticleDefinition&)
94 { 97 {
95 Initialise(); 98 Initialise();
96 } 99 }
97 100
98 //....oooOO0OOooo........oooOO0OOooo........oo 101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
99 void G4OpRayleigh::Initialise() 102 void G4OpRayleigh::Initialise()
100 { 103 {
101 SetVerboseLevel(G4OpticalParameters::Instanc 104 SetVerboseLevel(G4OpticalParameters::Instance()->GetRayleighVerboseLevel());
102 } 105 }
103 106
104 //....oooOO0OOooo........oooOO0OOooo........oo 107 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( 108 G4VParticleChange* G4OpRayleigh::PostStepDoIt(const G4Track& aTrack,
106 109 const G4Step& aStep)
107 { 110 {
108 aParticleChange.Initialize(aTrack); 111 aParticleChange.Initialize(aTrack);
109 const G4DynamicParticle* aParticle = aTrack. 112 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
110 113
111 if(verboseLevel > 1) 114 if(verboseLevel > 1)
112 { 115 {
113 G4cout << "OpRayleigh: Scattering Photon!" 116 G4cout << "OpRayleigh: Scattering Photon!" << G4endl
114 << "Old Momentum Direction: " << aP 117 << "Old Momentum Direction: " << aParticle->GetMomentumDirection()
115 << G4endl << "Old Polarization: " < 118 << G4endl << "Old Polarization: " << aParticle->GetPolarization()
116 << G4endl; 119 << G4endl;
117 } 120 }
118 121
119 G4double cosTheta; 122 G4double cosTheta;
120 G4ThreeVector oldMomDir, newMomDir; 123 G4ThreeVector oldMomDir, newMomDir;
121 G4ThreeVector oldPol, newPol; 124 G4ThreeVector oldPol, newPol;
122 G4double rand; 125 G4double rand;
123 G4double cost, sint, sinphi, cosphi; 126 G4double cost, sint, sinphi, cosphi;
124 127
125 do 128 do
126 { 129 {
127 // Try to simulate the scattered photon mo 130 // Try to simulate the scattered photon momentum direction
128 // w.r.t. the initial photon momentum dire 131 // w.r.t. the initial photon momentum direction
129 cost = G4UniformRand(); 132 cost = G4UniformRand();
130 sint = std::sqrt(1. - cost * cost); 133 sint = std::sqrt(1. - cost * cost);
131 // consider for the angle 90-180 degrees 134 // consider for the angle 90-180 degrees
132 if(G4UniformRand() < 0.5) 135 if(G4UniformRand() < 0.5)
133 cost = -cost; 136 cost = -cost;
134 137
135 // simulate the phi angle 138 // simulate the phi angle
136 rand = twopi * G4UniformRand(); 139 rand = twopi * G4UniformRand();
137 sinphi = std::sin(rand); 140 sinphi = std::sin(rand);
138 cosphi = std::cos(rand); 141 cosphi = std::cos(rand);
139 142
140 // construct the new momentum direction 143 // construct the new momentum direction
141 newMomDir.set(sint * cosphi, sint * sinphi 144 newMomDir.set(sint * cosphi, sint * sinphi, cost);
142 oldMomDir = aParticle->GetMomentumDirectio 145 oldMomDir = aParticle->GetMomentumDirection();
143 newMomDir.rotateUz(oldMomDir); 146 newMomDir.rotateUz(oldMomDir);
144 147
145 // calculate the new polarization directio 148 // calculate the new polarization direction
146 // The new polarization needs to be in the 149 // The new polarization needs to be in the same plane as the new
147 // momentum direction and the old polariza 150 // momentum direction and the old polarization direction
148 oldPol = aParticle->GetPolarization(); 151 oldPol = aParticle->GetPolarization();
149 newPol = (oldPol - newMomDir.dot(oldPol) * 152 newPol = (oldPol - newMomDir.dot(oldPol) * newMomDir).unit();
150 153
151 // There is a corner case, where the new m 154 // There is a corner case, where the new momentum direction
152 // is the same as old polarization directi 155 // is the same as old polarization direction:
153 // random generate the azimuthal angle w.r 156 // random generate the azimuthal angle w.r.t. new momentum direction
154 if(newPol.mag() == 0.) 157 if(newPol.mag() == 0.)
155 { 158 {
156 rand = G4UniformRand() * twopi; 159 rand = G4UniformRand() * twopi;
157 newPol.set(std::cos(rand), std::sin(rand 160 newPol.set(std::cos(rand), std::sin(rand), 0.);
158 newPol.rotateUz(newMomDir); 161 newPol.rotateUz(newMomDir);
159 } 162 }
160 else 163 else
161 { 164 {
162 // There are two directions perpendicula 165 // There are two directions perpendicular to the new momentum direction
163 if(G4UniformRand() < 0.5) 166 if(G4UniformRand() < 0.5)
164 newPol = -newPol; 167 newPol = -newPol;
165 } 168 }
166 169
167 // simulate according to the distribution 170 // simulate according to the distribution cos^2(theta)
168 cosTheta = newPol.dot(oldPol); 171 cosTheta = newPol.dot(oldPol);
169 // Loop checking, 13-Aug-2015, Peter Gumpl 172 // Loop checking, 13-Aug-2015, Peter Gumplinger
170 } while(std::pow(cosTheta, 2) < G4UniformRan 173 } while(std::pow(cosTheta, 2) < G4UniformRand());
171 174
172 aParticleChange.ProposePolarization(newPol); 175 aParticleChange.ProposePolarization(newPol);
173 aParticleChange.ProposeMomentumDirection(new 176 aParticleChange.ProposeMomentumDirection(newMomDir);
174 177
175 if(verboseLevel > 1) 178 if(verboseLevel > 1)
176 { 179 {
177 G4cout << "New Polarization: " << newPol < 180 G4cout << "New Polarization: " << newPol << G4endl
178 << "Polarization Change: " << *(aPa 181 << "Polarization Change: " << *(aParticleChange.GetPolarization())
179 << G4endl << "New Momentum Directio 182 << G4endl << "New Momentum Direction: " << newMomDir << G4endl
180 << "Momentum Change: " << *(aPartic 183 << "Momentum Change: " << *(aParticleChange.GetMomentumDirection())
181 << G4endl; 184 << G4endl;
182 } 185 }
183 186
184 return G4VDiscreteProcess::PostStepDoIt(aTra 187 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
185 } 188 }
186 189
187 //....oooOO0OOooo........oooOO0OOooo........oo 190 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
188 void G4OpRayleigh::BuildPhysicsTable(const G4P 191 void G4OpRayleigh::BuildPhysicsTable(const G4ParticleDefinition&)
189 { 192 {
190 if(thePhysicsTable) 193 if(thePhysicsTable)
191 { 194 {
192 // thePhysicsTable->clearAndDestroy(); 195 // thePhysicsTable->clearAndDestroy();
193 delete thePhysicsTable; 196 delete thePhysicsTable;
194 thePhysicsTable = nullptr; 197 thePhysicsTable = nullptr;
195 } 198 }
196 199
197 const G4MaterialTable* theMaterialTable = G4 200 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
198 const size_t numOfMaterials = G4 201 const size_t numOfMaterials = G4Material::GetNumberOfMaterials();
199 thePhysicsTable = ne 202 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
200 203
201 for(size_t i = 0; i < numOfMaterials; ++i) 204 for(size_t i = 0; i < numOfMaterials; ++i)
202 { 205 {
203 G4Material* material = (*the 206 G4Material* material = (*theMaterialTable)[i];
204 G4MaterialPropertiesTable* matProp = mater 207 G4MaterialPropertiesTable* matProp = material->GetMaterialPropertiesTable();
205 G4PhysicsFreeVector* rayleigh = nullptr; << 208 G4PhysicsOrderedFreeVector* rayleigh = nullptr;
206 if(matProp) 209 if(matProp)
207 { 210 {
208 rayleigh = matProp->GetProperty(kRAYLEIG 211 rayleigh = matProp->GetProperty(kRAYLEIGH);
209 if(rayleigh == nullptr) 212 if(rayleigh == nullptr)
210 rayleigh = CalculateRayleighMeanFreePa 213 rayleigh = CalculateRayleighMeanFreePaths(material);
211 } 214 }
212 thePhysicsTable->insertAt(i, rayleigh); 215 thePhysicsTable->insertAt(i, rayleigh);
213 } 216 }
214 } 217 }
215 218
216 //....oooOO0OOooo........oooOO0OOooo........oo 219 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
217 G4double G4OpRayleigh::GetMeanFreePath(const G 220 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack, G4double,
218 G4Force 221 G4ForceCondition*)
219 { 222 {
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 223 G4PhysicsOrderedFreeVector* rayleigh =
>> 224 static_cast<G4PhysicsOrderedFreeVector*>(
221 (*thePhysicsTable)(aTrack.GetMaterial()- 225 (*thePhysicsTable)(aTrack.GetMaterial()->GetIndex()));
222 226
223 G4double rsLength = DBL_MAX; 227 G4double rsLength = DBL_MAX;
224 if(rayleigh) 228 if(rayleigh)
225 { 229 {
226 rsLength = rayleigh->Value(aTrack.GetDynam 230 rsLength = rayleigh->Value(aTrack.GetDynamicParticle()->GetTotalMomentum(),
227 idx_rslength); 231 idx_rslength);
228 } 232 }
229 return rsLength; 233 return rsLength;
230 } 234 }
231 235
232 //....oooOO0OOooo........oooOO0OOooo........oo 236 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 237 G4PhysicsOrderedFreeVector* G4OpRayleigh::CalculateRayleighMeanFreePaths(
234 const G4Material* material) const 238 const G4Material* material) const
235 { 239 {
236 G4MaterialPropertiesTable* MPT = material->G 240 G4MaterialPropertiesTable* MPT = material->GetMaterialPropertiesTable();
237 241
238 // Retrieve the beta_T or isothermal compres 242 // Retrieve the beta_T or isothermal compressibility value. For backwards
239 // compatibility use a constant if the mater 243 // compatibility use a constant if the material is "Water". If the material
240 // doesn't have an ISOTHERMAL_COMPRESSIBILIT 244 // doesn't have an ISOTHERMAL_COMPRESSIBILITY constant then return
241 G4double betat; 245 G4double betat;
242 if(material->GetName() == "Water") 246 if(material->GetName() == "Water")
243 { 247 {
244 betat = 7.658e-23 * m3 / MeV; 248 betat = 7.658e-23 * m3 / MeV;
245 } 249 }
246 else if(MPT->ConstPropertyExists(kISOTHERMAL 250 else if(MPT->ConstPropertyExists(kISOTHERMAL_COMPRESSIBILITY))
247 { 251 {
248 betat = MPT->GetConstProperty(kISOTHERMAL_ 252 betat = MPT->GetConstProperty(kISOTHERMAL_COMPRESSIBILITY);
249 } 253 }
250 else 254 else
251 { 255 {
252 return nullptr; 256 return nullptr;
253 } 257 }
254 258
255 // If the material doesn't have a RINDEX pro 259 // If the material doesn't have a RINDEX property vector then return
256 G4MaterialPropertyVector* rIndex = MPT->GetP 260 G4MaterialPropertyVector* rIndex = MPT->GetProperty(kRINDEX);
257 if(rIndex == nullptr) 261 if(rIndex == nullptr)
258 return nullptr; 262 return nullptr;
259 263
260 // Retrieve the optional scale factor (scale 264 // Retrieve the optional scale factor (scales the scattering length)
261 G4double scaleFactor = 1.0; 265 G4double scaleFactor = 1.0;
262 if(MPT->ConstPropertyExists(kRS_SCALE_FACTOR 266 if(MPT->ConstPropertyExists(kRS_SCALE_FACTOR))
263 { 267 {
264 scaleFactor = MPT->GetConstProperty(kRS_SC 268 scaleFactor = MPT->GetConstProperty(kRS_SCALE_FACTOR);
265 } 269 }
266 270
267 // Retrieve the material temperature. For ba 271 // Retrieve the material temperature. For backwards compatibility use a
268 // constant if the material is "Water" 272 // constant if the material is "Water"
269 G4double temperature; 273 G4double temperature;
270 if(material->GetName() == "Water") 274 if(material->GetName() == "Water")
271 { 275 {
272 temperature = 276 temperature =
273 283.15 * kelvin; // Temperature of wate 277 283.15 * kelvin; // Temperature of water is 10 degrees celsius
274 } 278 }
275 else 279 else
276 { 280 {
277 temperature = material->GetTemperature(); 281 temperature = material->GetTemperature();
278 } 282 }
279 283
280 auto rayleighMFPs = new G4PhysicsFreeVector( << 284 G4PhysicsOrderedFreeVector* rayleighMFPs = new G4PhysicsOrderedFreeVector();
281 // This calculates the meanFreePath via the 285 // This calculates the meanFreePath via the Einstein-Smoluchowski formula
282 const G4double c1 = 286 const G4double c1 =
283 scaleFactor * betat * temperature * k_Bolt 287 scaleFactor * betat * temperature * k_Boltzmann / (6.0 * pi);
284 288
285 for(size_t uRIndex = 0; uRIndex < rIndex->Ge 289 for(size_t uRIndex = 0; uRIndex < rIndex->GetVectorLength(); ++uRIndex)
286 { 290 {
287 const G4double energy = rIndex->Ene 291 const G4double energy = rIndex->Energy(uRIndex);
288 const G4double rIndexSquared = (*rIndex)[u 292 const G4double rIndexSquared = (*rIndex)[uRIndex] * (*rIndex)[uRIndex];
289 const G4double xlambda = h_Planck * 293 const G4double xlambda = h_Planck * c_light / energy;
290 const G4double c2 = std::pow(tw 294 const G4double c2 = std::pow(twopi / xlambda, 4);
291 const G4double c3 = 295 const G4double c3 =
292 std::pow(((rIndexSquared - 1.0) * (rInde 296 std::pow(((rIndexSquared - 1.0) * (rIndexSquared + 2.0) / 3.0), 2);
293 297
294 const G4double meanFreePath = 1.0 / (c1 * 298 const G4double meanFreePath = 1.0 / (c1 * c2 * c3);
295 299
296 if(verboseLevel > 0) 300 if(verboseLevel > 0)
297 { 301 {
298 G4cout << energy << "MeV\t" << meanFreeP 302 G4cout << energy << "MeV\t" << meanFreePath << "mm" << G4endl;
299 } 303 }
300 304
301 rayleighMFPs->InsertValues(energy, meanFre 305 rayleighMFPs->InsertValues(energy, meanFreePath);
302 } 306 }
303 307
304 return rayleighMFPs; 308 return rayleighMFPs;
305 } <<
306 <<
307 //....oooOO0OOooo........oooOO0OOooo........oo <<
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo <<
309 { <<
310 verboseLevel = verbose; <<
311 G4OpticalParameters::Instance()->SetRayleigh <<
312 } 309 }
313 310