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25 // 25 //
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 // mail: gum@triumf.ca
60 // 61 //
61 ////////////////////////////////////////////// 62 ////////////////////////////////////////////////////////////////////////
62 63
63 #include "G4OpRayleigh.hh" 64 #include "G4OpRayleigh.hh"
>> 65
64 #include "G4ios.hh" 66 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" 67 #include "G4PhysicalConstants.hh"
66 #include "G4SystemOfUnits.hh" 68 #include "G4SystemOfUnits.hh"
67 #include "G4OpticalParameters.hh" <<
68 #include "G4OpProcessSubType.hh" 69 #include "G4OpProcessSubType.hh"
69 70
70 //....oooOO0OOooo........oooOO0OOooo........oo << 71 /////////////////////////
>> 72 // Class Implementation
>> 73 /////////////////////////
>> 74
>> 75 //////////////
>> 76 // Operators
>> 77 //////////////
>> 78
>> 79 // G4OpRayleigh::operator=(const G4OpRayleigh &right)
>> 80 // {
>> 81 // }
>> 82
>> 83 /////////////////
>> 84 // Constructors
>> 85 /////////////////
>> 86
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro 87 G4OpRayleigh::G4OpRayleigh(const G4String& processName, G4ProcessType type)
72 : G4VDiscreteProcess(processName, type) << 88 : G4VDiscreteProcess(processName, type)
73 { 89 {
74 Initialise(); << 90 SetProcessSubType(fOpRayleigh);
75 SetProcessSubType(fOpRayleigh); <<
76 thePhysicsTable = nullptr; <<
77 91
78 if(verboseLevel > 0) << 92 thePhysicsTable = NULL;
79 { <<
80 G4cout << GetProcessName() << " is created <<
81 } <<
82 } <<
83 93
84 //....oooOO0OOooo........oooOO0OOooo........oo << 94 if (verboseLevel>0) {
85 G4OpRayleigh::~G4OpRayleigh() << 95 G4cout << GetProcessName() << " is created " << G4endl;
86 { << 96 }
87 // VI: inside this PhysicsTable all properti <<
88 // it is not possible to destroy <<
89 delete thePhysicsTable; <<
90 } 97 }
91 98
92 //....oooOO0OOooo........oooOO0OOooo........oo << 99 // G4OpRayleigh::G4OpRayleigh(const G4OpRayleigh &right)
93 void G4OpRayleigh::PreparePhysicsTable(const G << 100 // {
94 { << 101 // }
95 Initialise(); << 102
96 } << 103 ////////////////
>> 104 // Destructors
>> 105 ////////////////
97 106
98 //....oooOO0OOooo........oooOO0OOooo........oo << 107 G4OpRayleigh::~G4OpRayleigh()
99 void G4OpRayleigh::Initialise() <<
100 { 108 {
101 SetVerboseLevel(G4OpticalParameters::Instanc << 109 if (thePhysicsTable) {
>> 110 thePhysicsTable->clearAndDestroy();
>> 111 delete thePhysicsTable;
>> 112 }
102 } 113 }
103 114
104 //....oooOO0OOooo........oooOO0OOooo........oo << 115 ////////////
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( << 116 // Methods
106 << 117 ////////////
107 { <<
108 aParticleChange.Initialize(aTrack); <<
109 const G4DynamicParticle* aParticle = aTrack. <<
110 <<
111 if(verboseLevel > 1) <<
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; <<
124 118
125 do << 119 // PostStepDoIt
126 { << 120 // -------------
127 // Try to simulate the scattered photon mo << 121 //
128 // w.r.t. the initial photon momentum dire << 122 G4VParticleChange*
129 cost = G4UniformRand(); << 123 G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
130 sint = std::sqrt(1. - cost * cost); << 124 {
131 // consider for the angle 90-180 degrees << 125 aParticleChange.Initialize(aTrack);
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 <<
171 126
172 aParticleChange.ProposePolarization(newPol); << 127 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
173 aParticleChange.ProposeMomentumDirection(new <<
174 128
175 if(verboseLevel > 1) << 129 if (verboseLevel>0) {
176 { << 130 G4cout << "Scattering Photon!" << G4endl;
177 G4cout << "New Polarization: " << newPol < << 131 G4cout << "Old Momentum Direction: "
178 << "Polarization Change: " << *(aPa << 132 << aParticle->GetMomentumDirection() << G4endl;
179 << G4endl << "New Momentum Directio << 133 G4cout << "Old Polarization: "
180 << "Momentum Change: " << *(aPartic << 134 << aParticle->GetPolarization() << G4endl;
181 << G4endl; << 135 }
182 } << 136
>> 137 G4double cosTheta;
>> 138 G4ThreeVector OldMomentumDirection, NewMomentumDirection;
>> 139 G4ThreeVector OldPolarization, NewPolarization;
>> 140
>> 141 G4double rand, constant;
>> 142 G4double CosTheta, SinTheta, SinPhi, CosPhi, unit_x, unit_y, unit_z;
>> 143
>> 144 do {
>> 145 // Try to simulate the scattered photon momentum direction
>> 146 // w.r.t. the initial photon momentum direction
>> 147
>> 148 CosTheta = G4UniformRand();
>> 149 SinTheta = std::sqrt(1.-CosTheta*CosTheta);
>> 150 // consider for the angle 90-180 degrees
>> 151 if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
>> 152
>> 153 // simulate the phi angle
>> 154 rand = twopi*G4UniformRand();
>> 155 SinPhi = std::sin(rand);
>> 156 CosPhi = std::cos(rand);
>> 157
>> 158 // start constructing the new momentum direction
>> 159 unit_x = SinTheta * CosPhi;
>> 160 unit_y = SinTheta * SinPhi;
>> 161 unit_z = CosTheta;
>> 162 NewMomentumDirection.set (unit_x,unit_y,unit_z);
>> 163
>> 164 // Rotate the new momentum direction into global reference system
>> 165 OldMomentumDirection = aParticle->GetMomentumDirection();
>> 166 OldMomentumDirection = OldMomentumDirection.unit();
>> 167 NewMomentumDirection.rotateUz(OldMomentumDirection);
>> 168 NewMomentumDirection = NewMomentumDirection.unit();
>> 169
>> 170 // calculate the new polarization direction
>> 171 // The new polarization needs to be in the same plane as the new
>> 172 // momentum direction and the old polarization direction
>> 173 OldPolarization = aParticle->GetPolarization();
>> 174 constant = -NewMomentumDirection.dot(OldPolarization);
>> 175
>> 176 NewPolarization = OldPolarization + constant*NewMomentumDirection;
>> 177 NewPolarization = NewPolarization.unit();
>> 178
>> 179 // There is a corner case, where the Newmomentum direction
>> 180 // is the same as oldpolariztion direction:
>> 181 // random generate the azimuthal angle w.r.t. Newmomentum direction
>> 182 if (NewPolarization.mag() == 0.) {
>> 183 rand = G4UniformRand()*twopi;
>> 184 NewPolarization.set(std::cos(rand),std::sin(rand),0.);
>> 185 NewPolarization.rotateUz(NewMomentumDirection);
>> 186 } else {
>> 187 // There are two directions which are perpendicular
>> 188 // to the new momentum direction
>> 189 if (G4UniformRand() < 0.5) NewPolarization = -NewPolarization;
>> 190 }
>> 191
>> 192 // simulate according to the distribution cos^2(theta)
>> 193 cosTheta = NewPolarization.dot(OldPolarization);
>> 194 // Loop checking, 13-Aug-2015, Peter Gumplinger
>> 195 } while (std::pow(cosTheta,2) < G4UniformRand());
>> 196
>> 197 aParticleChange.ProposePolarization(NewPolarization);
>> 198 aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
>> 199
>> 200 if (verboseLevel>0) {
>> 201 G4cout << "New Polarization: "
>> 202 << NewPolarization << G4endl;
>> 203 G4cout << "Polarization Change: "
>> 204 << *(aParticleChange.GetPolarization()) << G4endl;
>> 205 G4cout << "New Momentum Direction: "
>> 206 << NewMomentumDirection << G4endl;
>> 207 G4cout << "Momentum Change: "
>> 208 << *(aParticleChange.GetMomentumDirection()) << G4endl;
>> 209 }
183 210
184 return G4VDiscreteProcess::PostStepDoIt(aTra << 211 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
185 } 212 }
186 213
187 //....oooOO0OOooo........oooOO0OOooo........oo << 214 // BuildPhysicsTable for the Rayleigh Scattering process
>> 215 // --------------------------------------------------------
188 void G4OpRayleigh::BuildPhysicsTable(const G4P 216 void G4OpRayleigh::BuildPhysicsTable(const G4ParticleDefinition&)
189 { 217 {
190 if(thePhysicsTable) << 218 if (thePhysicsTable) {
191 { << 219 thePhysicsTable->clearAndDestroy();
192 // thePhysicsTable->clearAndDestroy(); << 220 delete thePhysicsTable;
193 delete thePhysicsTable; << 221 thePhysicsTable = NULL;
194 thePhysicsTable = nullptr; <<
195 } 222 }
196 223
197 const G4MaterialTable* theMaterialTable = G4 224 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
198 const size_t numOfMaterials = G4 << 225 const G4int numOfMaterials = G4Material::GetNumberOfMaterials();
199 thePhysicsTable = ne <<
200 226
201 for(size_t i = 0; i < numOfMaterials; ++i) << 227 thePhysicsTable = new G4PhysicsTable( numOfMaterials );
202 { << 228
203 G4Material* material = (*the << 229 for( G4int iMaterial = 0; iMaterial < numOfMaterials; iMaterial++ )
204 G4MaterialPropertiesTable* matProp = mater << 230 {
205 G4PhysicsFreeVector* rayleigh = nullptr; << 231 G4Material* material = (*theMaterialTable)[iMaterial];
206 if(matProp) << 232 G4MaterialPropertiesTable* materialProperties =
207 { << 233 material->GetMaterialPropertiesTable();
208 rayleigh = matProp->GetProperty(kRAYLEIG << 234 G4PhysicsOrderedFreeVector* rayleigh = NULL;
209 if(rayleigh == nullptr) << 235 if ( materialProperties != NULL ) {
210 rayleigh = CalculateRayleighMeanFreePa << 236 rayleigh = materialProperties->GetProperty( kRAYLEIGH );
211 } << 237 if ( rayleigh == NULL ) rayleigh =
212 thePhysicsTable->insertAt(i, rayleigh); << 238 CalculateRayleighMeanFreePaths( material );
>> 239 }
>> 240 thePhysicsTable->insertAt( iMaterial, rayleigh );
213 } 241 }
214 } 242 }
215 243
216 //....oooOO0OOooo........oooOO0OOooo........oo << 244 // GetMeanFreePath()
217 G4double G4OpRayleigh::GetMeanFreePath(const G << 245 // -----------------
218 G4Force << 246 //
>> 247 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack,
>> 248 G4double ,
>> 249 G4ForceCondition* )
219 { 250 {
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 251 const G4DynamicParticle* particle = aTrack.GetDynamicParticle();
221 (*thePhysicsTable)(aTrack.GetMaterial()- << 252 const G4double photonMomentum = particle->GetTotalMomentum();
222 << 253 const G4Material* material = aTrack.GetMaterial();
>> 254
>> 255 G4PhysicsOrderedFreeVector* rayleigh =
>> 256 static_cast<G4PhysicsOrderedFreeVector*>
>> 257 ((*thePhysicsTable)(material->GetIndex()));
>> 258
223 G4double rsLength = DBL_MAX; 259 G4double rsLength = DBL_MAX;
224 if(rayleigh) << 260 if( rayleigh != NULL ) rsLength = rayleigh->Value( photonMomentum );
225 { <<
226 rsLength = rayleigh->Value(aTrack.GetDynam <<
227 idx_rslength); <<
228 } <<
229 return rsLength; 261 return rsLength;
230 } 262 }
231 263
232 //....oooOO0OOooo........oooOO0OOooo........oo << 264 // CalculateRayleighMeanFreePaths()
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 265 // --------------------------------
234 const G4Material* material) const << 266 // Private method to compute Rayleigh Scattering Lengths
>> 267 G4PhysicsOrderedFreeVector*
>> 268 G4OpRayleigh::CalculateRayleighMeanFreePaths( const G4Material* material ) const
235 { 269 {
236 G4MaterialPropertiesTable* MPT = material->G << 270 G4MaterialPropertiesTable* materialProperties =
>> 271 material->GetMaterialPropertiesTable();
237 272
238 // Retrieve the beta_T or isothermal compres 273 // Retrieve the beta_T or isothermal compressibility value. For backwards
239 // compatibility use a constant if the mater 274 // compatibility use a constant if the material is "Water". If the material
240 // doesn't have an ISOTHERMAL_COMPRESSIBILIT 275 // doesn't have an ISOTHERMAL_COMPRESSIBILITY constant then return
241 G4double betat; 276 G4double betat;
242 if(material->GetName() == "Water") << 277 if ( material->GetName() == "Water" )
243 { << 278 betat = 7.658e-23*m3/MeV;
244 betat = 7.658e-23 * m3 / MeV; << 279 else if(materialProperties->ConstPropertyExists("ISOTHERMAL_COMPRESSIBILITY"))
245 } << 280 betat = materialProperties->GetConstProperty(kISOTHERMAL_COMPRESSIBILITY);
246 else if(MPT->ConstPropertyExists(kISOTHERMAL <<
247 { <<
248 betat = MPT->GetConstProperty(kISOTHERMAL_ <<
249 } <<
250 else 281 else
251 { << 282 return NULL;
252 return nullptr; <<
253 } <<
254 283
255 // If the material doesn't have a RINDEX pro 284 // If the material doesn't have a RINDEX property vector then return
256 G4MaterialPropertyVector* rIndex = MPT->GetP << 285 G4MaterialPropertyVector* rIndex = materialProperties->GetProperty(kRINDEX);
257 if(rIndex == nullptr) << 286 if ( rIndex == NULL ) return NULL;
258 return nullptr; <<
259 287
260 // Retrieve the optional scale factor (scale << 288 // Retrieve the optional scale factor, (this just scales the scattering length
261 G4double scaleFactor = 1.0; 289 G4double scaleFactor = 1.0;
262 if(MPT->ConstPropertyExists(kRS_SCALE_FACTOR << 290 if( materialProperties->ConstPropertyExists( "RS_SCALE_FACTOR" ) )
263 { << 291 scaleFactor= materialProperties->GetConstProperty(kRS_SCALE_FACTOR );
264 scaleFactor = MPT->GetConstProperty(kRS_SC <<
265 } <<
266 292
267 // Retrieve the material temperature. For ba << 293 // Retrieve the material temperature. For backwards compatibility use a
268 // constant if the material is "Water" 294 // constant if the material is "Water"
269 G4double temperature; 295 G4double temperature;
270 if(material->GetName() == "Water") << 296 if( material->GetName() == "Water" )
271 { << 297 temperature = 283.15*kelvin; // Temperature of water is 10 degrees celsius
272 temperature = <<
273 283.15 * kelvin; // Temperature of wate <<
274 } <<
275 else 298 else
276 { <<
277 temperature = material->GetTemperature(); 299 temperature = material->GetTemperature();
278 } <<
279 300
280 auto rayleighMFPs = new G4PhysicsFreeVector( << 301 G4PhysicsOrderedFreeVector* rayleighMeanFreePaths =
>> 302 new G4PhysicsOrderedFreeVector();
281 // This calculates the meanFreePath via the 303 // This calculates the meanFreePath via the Einstein-Smoluchowski formula
282 const G4double c1 = << 304 const G4double c1 = scaleFactor * betat * temperature * k_Boltzmann /
283 scaleFactor * betat * temperature * k_Bolt << 305 ( 6.0 * pi );
284 306
285 for(size_t uRIndex = 0; uRIndex < rIndex->Ge << 307 for( size_t uRIndex = 0; uRIndex < rIndex->GetVectorLength(); uRIndex++ )
286 { 308 {
287 const G4double energy = rIndex->Ene << 309 const G4double energy = rIndex->Energy( uRIndex );
288 const G4double rIndexSquared = (*rIndex)[u << 310 const G4double rIndexSquared = (*rIndex)[uRIndex] * (*rIndex)[uRIndex];
289 const G4double xlambda = h_Planck * << 311 const G4double xlambda = h_Planck * c_light / energy;
290 const G4double c2 = std::pow(tw << 312 const G4double c2 = std::pow(twopi/xlambda,4);
291 const G4double c3 = << 313 const G4double c3 =
292 std::pow(((rIndexSquared - 1.0) * (rInde << 314 std::pow(((rIndexSquared-1.0)*(rIndexSquared+2.0 )/3.0),2);
293 <<
294 const G4double meanFreePath = 1.0 / (c1 * <<
295 <<
296 if(verboseLevel > 0) <<
297 { <<
298 G4cout << energy << "MeV\t" << meanFreeP <<
299 } <<
300 315
301 rayleighMFPs->InsertValues(energy, meanFre << 316 const G4double meanFreePath = 1.0 / ( c1 * c2 * c3 );
302 } <<
303 317
304 return rayleighMFPs; << 318 if( verboseLevel>0 )
305 } << 319 G4cout << energy << "MeV\t" << meanFreePath << "mm" << G4endl;
306 320
307 //....oooOO0OOooo........oooOO0OOooo........oo << 321 rayleighMeanFreePaths->InsertValues( energy, meanFreePath );
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo << 322 }
309 { << 323
310 verboseLevel = verbose; << 324 return rayleighMeanFreePaths;
311 G4OpticalParameters::Instance()->SetRayleigh <<
312 } 325 }
313 326