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26 // 26 //
>> 27 // $Id: G4OpRayleigh.cc 84717 2014-10-20 07:39:47Z 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: 2014-10-10 - This version calculates the Rayleigh scattering
40 // length for more materials than 41 // length for more materials than just Water (although the Water
41 // default is kept). To do this t 42 // default is kept). To do this the user would need to specify the
42 // ISOTHERMAL_COMPRESSIBILITY as 43 // ISOTHERMAL_COMPRESSIBILITY as a material property and
43 // optionally an RS_SCALE_LENGTH 44 // optionally an RS_SCALE_LENGTH (useful for testing). Code comes
44 // from Philip Graham (Queen Mary 45 // from Philip Graham (Queen Mary University of London).
45 // 2010-06-11 - Fix Bug 207; Than 46 // 2010-06-11 - Fix Bug 207; Thanks to Xin Qian
46 // (Kellogg Radiation Lab of Calt 47 // (Kellogg Radiation Lab of Caltech)
47 // 2005-07-28 - add G4ProcessType 48 // 2005-07-28 - add G4ProcessType to constructor
48 // 2001-10-18 by Peter Gumplinger 49 // 2001-10-18 by Peter Gumplinger
49 // eliminate unused variable warn 50 // eliminate unused variable warning on Linux (gcc-2.95.2)
50 // 2001-09-18 by mma 51 // 2001-09-18 by mma
51 // >numOfMaterials=G4Material::Ge << 52 // >numOfMaterials=G4Material::GetNumberOfMaterials() in BuildPhy
52 // 2001-01-30 by Peter Gumplinger 53 // 2001-01-30 by Peter Gumplinger
53 // > allow for positiv and negati 54 // > allow for positiv and negative CosTheta and force the
54 // > new momentum direction to be 55 // > new momentum direction to be in the same plane as the
55 // > new and old polarization vec 56 // > new and old polarization vectors
56 // 2001-01-29 by Peter Gumplinger 57 // 2001-01-29 by Peter Gumplinger
57 // > fix calculation of SinTheta 58 // > fix calculation of SinTheta (from CosTheta)
58 // 1997-04-09 by Peter Gumplinger 59 // 1997-04-09 by Peter Gumplinger
59 // > new physics/tracking scheme 60 // > new physics/tracking scheme
>> 61 // mail: gum@triumf.ca
60 // 62 //
61 ////////////////////////////////////////////// 63 ////////////////////////////////////////////////////////////////////////
62 64
63 #include "G4OpRayleigh.hh" 65 #include "G4OpRayleigh.hh"
>> 66
64 #include "G4ios.hh" 67 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" 68 #include "G4PhysicalConstants.hh"
66 #include "G4SystemOfUnits.hh" 69 #include "G4SystemOfUnits.hh"
67 #include "G4OpticalParameters.hh" <<
68 #include "G4OpProcessSubType.hh" 70 #include "G4OpProcessSubType.hh"
69 71
70 //....oooOO0OOooo........oooOO0OOooo........oo << 72 /////////////////////////
>> 73 // Class Implementation
>> 74 /////////////////////////
>> 75
>> 76 //////////////
>> 77 // Operators
>> 78 //////////////
>> 79
>> 80 // G4OpRayleigh::operator=(const G4OpRayleigh &right)
>> 81 // {
>> 82 // }
>> 83
>> 84 /////////////////
>> 85 // Constructors
>> 86 /////////////////
>> 87
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro 88 G4OpRayleigh::G4OpRayleigh(const G4String& processName, G4ProcessType type)
72 : G4VDiscreteProcess(processName, type) << 89 : G4VDiscreteProcess(processName, type)
73 { 90 {
74 Initialise(); << 91 SetProcessSubType(fOpRayleigh);
75 SetProcessSubType(fOpRayleigh); <<
76 thePhysicsTable = nullptr; <<
77 92
78 if(verboseLevel > 0) << 93 thePhysicsTable = NULL;
79 { <<
80 G4cout << GetProcessName() << " is created <<
81 } <<
82 } <<
83 94
84 //....oooOO0OOooo........oooOO0OOooo........oo << 95 if (verboseLevel>0) {
85 G4OpRayleigh::~G4OpRayleigh() << 96 G4cout << GetProcessName() << " is created " << G4endl;
86 { << 97 }
87 // VI: inside this PhysicsTable all properti <<
88 // it is not possible to destroy <<
89 delete thePhysicsTable; <<
90 } 98 }
91 99
92 //....oooOO0OOooo........oooOO0OOooo........oo << 100 // G4OpRayleigh::G4OpRayleigh(const G4OpRayleigh &right)
93 void G4OpRayleigh::PreparePhysicsTable(const G << 101 // {
94 { << 102 // }
95 Initialise(); << 103
96 } << 104 ////////////////
>> 105 // Destructors
>> 106 ////////////////
97 107
98 //....oooOO0OOooo........oooOO0OOooo........oo << 108 G4OpRayleigh::~G4OpRayleigh()
99 void G4OpRayleigh::Initialise() <<
100 { 109 {
101 SetVerboseLevel(G4OpticalParameters::Instanc << 110 if (thePhysicsTable) {
>> 111 thePhysicsTable->clearAndDestroy();
>> 112 delete thePhysicsTable;
>> 113 }
102 } 114 }
103 115
104 //....oooOO0OOooo........oooOO0OOooo........oo << 116 ////////////
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( << 117 // Methods
106 << 118 ////////////
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; <<
124 119
125 do << 120 // PostStepDoIt
126 { << 121 // -------------
127 // Try to simulate the scattered photon mo << 122 //
128 // w.r.t. the initial photon momentum dire << 123 G4VParticleChange*
129 cost = G4UniformRand(); << 124 G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
130 sint = std::sqrt(1. - cost * cost); << 125 {
131 // consider for the angle 90-180 degrees << 126 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 <<
171 127
172 aParticleChange.ProposePolarization(newPol); << 128 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
173 aParticleChange.ProposeMomentumDirection(new <<
174 129
175 if(verboseLevel > 1) << 130 if (verboseLevel>0) {
176 { << 131 G4cout << "Scattering Photon!" << G4endl;
177 G4cout << "New Polarization: " << newPol < << 132 G4cout << "Old Momentum Direction: "
178 << "Polarization Change: " << *(aPa << 133 << aParticle->GetMomentumDirection() << G4endl;
179 << G4endl << "New Momentum Directio << 134 G4cout << "Old Polarization: "
180 << "Momentum Change: " << *(aPartic << 135 << aParticle->GetPolarization() << G4endl;
181 << G4endl; << 136 }
182 } << 137
>> 138 G4double cosTheta;
>> 139 G4ThreeVector OldMomentumDirection, NewMomentumDirection;
>> 140 G4ThreeVector OldPolarization, NewPolarization;
>> 141
>> 142 do {
>> 143 // Try to simulate the scattered photon momentum direction
>> 144 // w.r.t. the initial photon momentum direction
>> 145
>> 146 G4double CosTheta = G4UniformRand();
>> 147 G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
>> 148 // consider for the angle 90-180 degrees
>> 149 if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
>> 150
>> 151 // simulate the phi angle
>> 152 G4double rand = twopi*G4UniformRand();
>> 153 G4double SinPhi = std::sin(rand);
>> 154 G4double CosPhi = std::cos(rand);
>> 155
>> 156 // start constructing the new momentum direction
>> 157 G4double unit_x = SinTheta * CosPhi;
>> 158 G4double unit_y = SinTheta * SinPhi;
>> 159 G4double unit_z = CosTheta;
>> 160 NewMomentumDirection.set (unit_x,unit_y,unit_z);
>> 161
>> 162 // Rotate the new momentum direction into global reference system
>> 163 OldMomentumDirection = aParticle->GetMomentumDirection();
>> 164 OldMomentumDirection = OldMomentumDirection.unit();
>> 165 NewMomentumDirection.rotateUz(OldMomentumDirection);
>> 166 NewMomentumDirection = NewMomentumDirection.unit();
>> 167
>> 168 // calculate the new polarization direction
>> 169 // The new polarization needs to be in the same plane as the new
>> 170 // momentum direction and the old polarization direction
>> 171 OldPolarization = aParticle->GetPolarization();
>> 172 G4double constant = -1./NewMomentumDirection.dot(OldPolarization);
>> 173
>> 174 NewPolarization = NewMomentumDirection + constant*OldPolarization;
>> 175 NewPolarization = NewPolarization.unit();
>> 176
>> 177 // There is a corner case, where the Newmomentum direction
>> 178 // is the same as oldpolariztion direction:
>> 179 // random generate the azimuthal angle w.r.t. Newmomentum direction
>> 180 if (NewPolarization.mag() == 0.) {
>> 181 rand = G4UniformRand()*twopi;
>> 182 NewPolarization.set(std::cos(rand),std::sin(rand),0.);
>> 183 NewPolarization.rotateUz(NewMomentumDirection);
>> 184 } else {
>> 185 // There are two directions which are perpendicular
>> 186 // to the new momentum direction
>> 187 if (G4UniformRand() < 0.5) NewPolarization = -NewPolarization;
>> 188 }
>> 189
>> 190 // simulate according to the distribution cos^2(theta)
>> 191 cosTheta = NewPolarization.dot(OldPolarization);
>> 192 } while (std::pow(cosTheta,2) < G4UniformRand());
>> 193
>> 194 aParticleChange.ProposePolarization(NewPolarization);
>> 195 aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
>> 196
>> 197 if (verboseLevel>0) {
>> 198 G4cout << "New Polarization: "
>> 199 << NewPolarization << G4endl;
>> 200 G4cout << "Polarization Change: "
>> 201 << *(aParticleChange.GetPolarization()) << G4endl;
>> 202 G4cout << "New Momentum Direction: "
>> 203 << NewMomentumDirection << G4endl;
>> 204 G4cout << "Momentum Change: "
>> 205 << *(aParticleChange.GetMomentumDirection()) << G4endl;
>> 206 }
183 207
184 return G4VDiscreteProcess::PostStepDoIt(aTra << 208 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
185 } 209 }
186 210
187 //....oooOO0OOooo........oooOO0OOooo........oo << 211 // BuildPhysicsTable for the Rayleigh Scattering process
>> 212 // --------------------------------------------------------
188 void G4OpRayleigh::BuildPhysicsTable(const G4P 213 void G4OpRayleigh::BuildPhysicsTable(const G4ParticleDefinition&)
189 { 214 {
190 if(thePhysicsTable) << 215 if (thePhysicsTable) {
191 { << 216 thePhysicsTable->clearAndDestroy();
192 // thePhysicsTable->clearAndDestroy(); << 217 delete thePhysicsTable;
193 delete thePhysicsTable; << 218 thePhysicsTable = NULL;
194 thePhysicsTable = nullptr; <<
195 } 219 }
196 220
197 const G4MaterialTable* theMaterialTable = G4 221 const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
198 const size_t numOfMaterials = G4 << 222 const G4int numOfMaterials = G4Material::GetNumberOfMaterials();
199 thePhysicsTable = ne <<
200 223
201 for(size_t i = 0; i < numOfMaterials; ++i) << 224 thePhysicsTable = new G4PhysicsTable( numOfMaterials );
202 { << 225
203 G4Material* material = (*the << 226 for( G4int iMaterial = 0; iMaterial < numOfMaterials; iMaterial++ )
204 G4MaterialPropertiesTable* matProp = mater << 227 {
205 G4PhysicsFreeVector* rayleigh = nullptr; << 228 G4Material* material = (*theMaterialTable)[iMaterial];
206 if(matProp) << 229 G4MaterialPropertiesTable* materialProperties =
207 { << 230 material->GetMaterialPropertiesTable();
208 rayleigh = matProp->GetProperty(kRAYLEIG << 231 G4PhysicsOrderedFreeVector* rayleigh = NULL;
209 if(rayleigh == nullptr) << 232 if ( materialProperties != NULL ) {
210 rayleigh = CalculateRayleighMeanFreePa << 233 rayleigh = materialProperties->GetProperty( "RAYLEIGH" );
211 } << 234 if ( rayleigh == NULL ) rayleigh =
212 thePhysicsTable->insertAt(i, rayleigh); << 235 CalculateRayleighMeanFreePaths( material );
>> 236 }
>> 237 thePhysicsTable->insertAt( iMaterial, rayleigh );
213 } 238 }
214 } 239 }
215 240
216 //....oooOO0OOooo........oooOO0OOooo........oo << 241 // GetMeanFreePath()
217 G4double G4OpRayleigh::GetMeanFreePath(const G << 242 // -----------------
218 G4Force << 243 //
>> 244 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack,
>> 245 G4double ,
>> 246 G4ForceCondition* )
219 { 247 {
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 248 const G4DynamicParticle* particle = aTrack.GetDynamicParticle();
221 (*thePhysicsTable)(aTrack.GetMaterial()- << 249 const G4double photonMomentum = particle->GetTotalMomentum();
222 << 250 const G4Material* material = aTrack.GetMaterial();
>> 251
>> 252 G4PhysicsOrderedFreeVector* rayleigh =
>> 253 static_cast<G4PhysicsOrderedFreeVector*>
>> 254 ((*thePhysicsTable)(material->GetIndex()));
>> 255
223 G4double rsLength = DBL_MAX; 256 G4double rsLength = DBL_MAX;
224 if(rayleigh) << 257 if( rayleigh != NULL ) rsLength = rayleigh->Value( photonMomentum );
225 { <<
226 rsLength = rayleigh->Value(aTrack.GetDynam <<
227 idx_rslength); <<
228 } <<
229 return rsLength; 258 return rsLength;
230 } 259 }
231 260
232 //....oooOO0OOooo........oooOO0OOooo........oo << 261 // CalculateRayleighMeanFreePaths()
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 262 // --------------------------------
234 const G4Material* material) const << 263 // Private method to compute Rayleigh Scattering Lengths
>> 264 G4PhysicsOrderedFreeVector*
>> 265 G4OpRayleigh::CalculateRayleighMeanFreePaths( const G4Material* material ) const
235 { 266 {
236 G4MaterialPropertiesTable* MPT = material->G << 267 G4MaterialPropertiesTable* materialProperties =
>> 268 material->GetMaterialPropertiesTable();
237 269
238 // Retrieve the beta_T or isothermal compres 270 // Retrieve the beta_T or isothermal compressibility value. For backwards
239 // compatibility use a constant if the mater 271 // compatibility use a constant if the material is "Water". If the material
240 // doesn't have an ISOTHERMAL_COMPRESSIBILIT 272 // doesn't have an ISOTHERMAL_COMPRESSIBILITY constant then return
241 G4double betat; 273 G4double betat;
242 if(material->GetName() == "Water") << 274 if ( material->GetName() == "Water" )
243 { << 275 betat = 7.658e-23*m3/MeV;
244 betat = 7.658e-23 * m3 / MeV; << 276 else if(materialProperties->ConstPropertyExists("ISOTHERMAL_COMPRESSIBILITY"))
245 } << 277 betat = materialProperties->GetConstProperty("ISOTHERMAL_COMPRESSIBILITY");
246 else if(MPT->ConstPropertyExists(kISOTHERMAL <<
247 { <<
248 betat = MPT->GetConstProperty(kISOTHERMAL_ <<
249 } <<
250 else 278 else
251 { << 279 return NULL;
252 return nullptr; <<
253 } <<
254 280
255 // If the material doesn't have a RINDEX pro 281 // If the material doesn't have a RINDEX property vector then return
256 G4MaterialPropertyVector* rIndex = MPT->GetP << 282 G4MaterialPropertyVector* rIndex = materialProperties->GetProperty("RINDEX");
257 if(rIndex == nullptr) << 283 if ( rIndex == NULL ) return NULL;
258 return nullptr; <<
259 284
260 // Retrieve the optional scale factor (scale << 285 // Retrieve the optional scale factor, (this just scales the scattering length
261 G4double scaleFactor = 1.0; 286 G4double scaleFactor = 1.0;
262 if(MPT->ConstPropertyExists(kRS_SCALE_FACTOR << 287 if( materialProperties->ConstPropertyExists( "RS_SCALE_FACTOR" ) )
263 { << 288 scaleFactor= materialProperties->GetConstProperty("RS_SCALE_FACTOR" );
264 scaleFactor = MPT->GetConstProperty(kRS_SC <<
265 } <<
266 289
267 // Retrieve the material temperature. For ba << 290 // Retrieve the material temperature. For backwards compatibility use a
268 // constant if the material is "Water" 291 // constant if the material is "Water"
269 G4double temperature; 292 G4double temperature;
270 if(material->GetName() == "Water") << 293 if( material->GetName() == "Water" )
271 { << 294 temperature = 283.15*kelvin; // Temperature of water is 10 degrees celsius
272 temperature = <<
273 283.15 * kelvin; // Temperature of wate <<
274 } <<
275 else 295 else
276 { <<
277 temperature = material->GetTemperature(); 296 temperature = material->GetTemperature();
278 } <<
279 297
280 auto rayleighMFPs = new G4PhysicsFreeVector( << 298 G4PhysicsOrderedFreeVector* rayleighMeanFreePaths =
>> 299 new G4PhysicsOrderedFreeVector();
281 // This calculates the meanFreePath via the 300 // This calculates the meanFreePath via the Einstein-Smoluchowski formula
282 const G4double c1 = << 301 const G4double c1 = scaleFactor * betat * temperature * k_Boltzmann /
283 scaleFactor * betat * temperature * k_Bolt << 302 ( 6.0 * pi );
284 303
285 for(size_t uRIndex = 0; uRIndex < rIndex->Ge << 304 for( size_t uRIndex = 0; uRIndex < rIndex->GetVectorLength(); uRIndex++ )
286 { 305 {
287 const G4double energy = rIndex->Ene << 306 const G4double energy = rIndex->Energy( uRIndex );
288 const G4double rIndexSquared = (*rIndex)[u << 307 const G4double rIndexSquared = (*rIndex)[uRIndex] * (*rIndex)[uRIndex];
289 const G4double xlambda = h_Planck * << 308 const G4double xlambda = h_Planck * c_light / energy;
290 const G4double c2 = std::pow(tw << 309 const G4double c2 = std::pow(twopi/xlambda,4);
291 const G4double c3 = << 310 const G4double c3 =
292 std::pow(((rIndexSquared - 1.0) * (rInde << 311 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 } <<
300 312
301 rayleighMFPs->InsertValues(energy, meanFre << 313 const G4double meanFreePath = 1.0 / ( c1 * c2 * c3 );
302 } <<
303 314
304 return rayleighMFPs; << 315 if( verboseLevel>0 )
305 } << 316 G4cout << energy << "MeV\t" << meanFreePath << "mm" << G4endl;
306 317
307 //....oooOO0OOooo........oooOO0OOooo........oo << 318 rayleighMeanFreePaths->InsertValues( energy, meanFreePath );
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo << 319 }
309 { << 320
310 verboseLevel = verbose; << 321 return rayleighMeanFreePaths;
311 G4OpticalParameters::Instance()->SetRayleigh <<
312 } 322 }
313 323