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25 // 22 //
26 // 23 //
>> 24 // $Id: G4OpRayleigh.cc,v 1.5.2.1 2001/06/28 19:15:10 gunter Exp $
>> 25 // GEANT4 tag $Name: $
27 // 26 //
28 // << 27 //
29 ////////////////////////////////////////////// 28 ////////////////////////////////////////////////////////////////////////
30 // Optical Photon Rayleigh Scattering Class Im 29 // Optical Photon Rayleigh Scattering Class Implementation
31 ////////////////////////////////////////////// 30 ////////////////////////////////////////////////////////////////////////
32 // 31 //
33 // File: G4OpRayleigh.cc << 32 // File: G4OpRayleigh.cc
34 // Description: Discrete Process -- Rayleigh s << 33 // Description: Discrete Process -- Rayleigh scattering of optical
35 // photons << 34 // photons
36 // Version: 1.0 35 // Version: 1.0
37 // Created: 1996-05-31 << 36 // Created: 1996-05-31
38 // Author: Juliet Armstrong 37 // Author: Juliet Armstrong
39 // Updated: 2014-10-10 - This version cal << 38 // Updated: 2001-01-30 by Peter Gumplinger
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 <<
47 // 2005-07-28 - add G4ProcessType <<
48 // 2001-10-18 by Peter Gumplinger <<
49 // eliminate unused variable warn <<
50 // 2001-09-18 by mma <<
51 // >numOfMaterials=G4Material::Ge <<
52 // 2001-01-30 by Peter Gumplinger <<
53 // > allow for positiv and negati 39 // > allow for positiv and negative CosTheta and force the
54 // > new momentum direction to be 40 // > new momentum direction to be in the same plane as the
55 // > new and old polarization vec 41 // > new and old polarization vectors
56 // 2001-01-29 by Peter Gumplinger 42 // 2001-01-29 by Peter Gumplinger
57 // > fix calculation of SinTheta 43 // > fix calculation of SinTheta (from CosTheta)
58 // 1997-04-09 by Peter Gumplinger 44 // 1997-04-09 by Peter Gumplinger
59 // > new physics/tracking scheme 45 // > new physics/tracking scheme
>> 46 // mail: gum@triumf.ca
60 // 47 //
61 ////////////////////////////////////////////// 48 ////////////////////////////////////////////////////////////////////////
62 49
63 #include "G4OpRayleigh.hh" <<
64 #include "G4ios.hh" 50 #include "G4ios.hh"
65 #include "G4PhysicalConstants.hh" << 51 #include "G4OpRayleigh.hh"
66 #include "G4SystemOfUnits.hh" << 52
67 #include "G4OpticalParameters.hh" << 53 /////////////////////////
68 #include "G4OpProcessSubType.hh" << 54 // Class Implementation
69 << 55 /////////////////////////
70 //....oooOO0OOooo........oooOO0OOooo........oo << 56
71 G4OpRayleigh::G4OpRayleigh(const G4String& pro << 57 //////////////
72 : G4VDiscreteProcess(processName, type) << 58 // Operators
>> 59 //////////////
>> 60
>> 61 // G4OpRayleigh::operator=(const G4OpRayleigh &right)
>> 62 // {
>> 63 // }
>> 64
>> 65 /////////////////
>> 66 // Constructors
>> 67 /////////////////
>> 68
>> 69 G4OpRayleigh::G4OpRayleigh(const G4String& processName)
>> 70 : G4VDiscreteProcess(processName)
73 { 71 {
74 Initialise(); << 72
75 SetProcessSubType(fOpRayleigh); << 73 thePhysicsTable = NULL;
76 thePhysicsTable = nullptr; << 74
77 << 75 if (verboseLevel>0) {
78 if(verboseLevel > 0) << 76 G4cout << GetProcessName() << " is created " << G4endl;
79 { << 77 }
80 G4cout << GetProcessName() << " is created << 78
81 } << 79 BuildThePhysicsTable();
82 } 80 }
83 81
84 //....oooOO0OOooo........oooOO0OOooo........oo << 82 // G4OpRayleigh::G4OpRayleigh(const G4OpRayleigh &right)
>> 83 // {
>> 84 // }
>> 85
>> 86 ////////////////
>> 87 // Destructors
>> 88 ////////////////
>> 89
85 G4OpRayleigh::~G4OpRayleigh() 90 G4OpRayleigh::~G4OpRayleigh()
86 { 91 {
87 // VI: inside this PhysicsTable all properti << 92 if (thePhysicsTable!= NULL) {
88 // it is not possible to destroy << 93 thePhysicsTable->clearAndDestroy();
89 delete thePhysicsTable; << 94 delete thePhysicsTable;
>> 95 }
90 } 96 }
91 97
92 //....oooOO0OOooo........oooOO0OOooo........oo << 98 ////////////
93 void G4OpRayleigh::PreparePhysicsTable(const G << 99 // Methods
94 { << 100 ////////////
95 Initialise(); <<
96 } <<
97 101
98 //....oooOO0OOooo........oooOO0OOooo........oo << 102 // PostStepDoIt
99 void G4OpRayleigh::Initialise() << 103 // -------------
>> 104 //
>> 105 G4VParticleChange*
>> 106 G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
100 { 107 {
101 SetVerboseLevel(G4OpticalParameters::Instanc << 108 aParticleChange.Initialize(aTrack);
102 } <<
103 109
104 //....oooOO0OOooo........oooOO0OOooo........oo << 110 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
105 G4VParticleChange* G4OpRayleigh::PostStepDoIt( << 111 const G4Material* aMaterial = aTrack.GetMaterial();
106 <<
107 { <<
108 aParticleChange.Initialize(aTrack); <<
109 const G4DynamicParticle* aParticle = aTrack. <<
110 112
111 if(verboseLevel > 1) << 113 if (verboseLevel>0) {
112 { << 114 G4cout << "Scattering Photon!" << G4endl;
113 G4cout << "OpRayleigh: Scattering Photon!" << 115 G4cout << "Old Momentum Direction: "
114 << "Old Momentum Direction: " << aP << 116 << aParticle->GetMomentumDirection() << G4endl;
115 << G4endl << "Old Polarization: " < << 117 G4cout << "Old Polarization: "
116 << G4endl; << 118 << aParticle->GetPolarization() << G4endl;
117 } << 119 }
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 } <<
183 120
184 return G4VDiscreteProcess::PostStepDoIt(aTra << 121 // find polar angle w.r.t. old polarization vector
185 } <<
186 122
187 //....oooOO0OOooo........oooOO0OOooo........oo << 123 G4double rand = G4UniformRand();
188 void G4OpRayleigh::BuildPhysicsTable(const G4P << 124
189 { << 125 G4double CosTheta = pow(rand, 1./3.);
190 if(thePhysicsTable) << 126 G4double SinTheta = sqrt(1.-CosTheta*CosTheta);
191 { << 127
192 // thePhysicsTable->clearAndDestroy(); << 128 if(G4UniformRand() < 0.5)CosTheta = -CosTheta;
193 delete thePhysicsTable; << 129
194 thePhysicsTable = nullptr; << 130 // find azimuthal angle w.r.t old polarization vector
195 } << 131
196 << 132 rand = G4UniformRand();
197 const G4MaterialTable* theMaterialTable = G4 << 133
198 const size_t numOfMaterials = G4 << 134 G4double Phi = twopi*rand;
199 thePhysicsTable = ne << 135 G4double SinPhi = sin(Phi);
200 << 136 G4double CosPhi = cos(Phi);
201 for(size_t i = 0; i < numOfMaterials; ++i) << 137
202 { << 138 G4double unit_x = SinTheta * CosPhi;
203 G4Material* material = (*the << 139 G4double unit_y = SinTheta * SinPhi;
204 G4MaterialPropertiesTable* matProp = mater << 140 G4double unit_z = CosTheta;
205 G4PhysicsFreeVector* rayleigh = nullptr; << 141
206 if(matProp) << 142 G4ThreeVector NewPolarization (unit_x,unit_y,unit_z);
207 { << 143
208 rayleigh = matProp->GetProperty(kRAYLEIG << 144 // Rotate new polarization direction into global reference system
209 if(rayleigh == nullptr) << 145
210 rayleigh = CalculateRayleighMeanFreePa << 146 G4ThreeVector OldPolarization = aParticle->GetPolarization();
211 } << 147 OldPolarization = OldPolarization.unit();
212 thePhysicsTable->insertAt(i, rayleigh); << 148
213 } << 149 NewPolarization.rotateUz(OldPolarization);
>> 150 NewPolarization = NewPolarization.unit();
>> 151
>> 152 // -- new momentum direction is normal to the new
>> 153 // polarization vector and in the same plane as the
>> 154 // old and new polarization vectors --
>> 155
>> 156 G4ThreeVector NewMomentumDirection =
>> 157 OldPolarization - NewPolarization * CosTheta;
>> 158
>> 159 if(G4UniformRand() < 0.5)NewMomentumDirection = -NewMomentumDirection;
>> 160 NewMomentumDirection = NewMomentumDirection.unit();
>> 161
>> 162 aParticleChange.SetPolarizationChange(NewPolarization);
>> 163
>> 164 aParticleChange.SetMomentumChange(NewMomentumDirection);
>> 165
>> 166 if (verboseLevel>0) {
>> 167 G4cout << "New Polarization: "
>> 168 << NewPolarization << G4endl;
>> 169 G4cout << "Polarization Change: "
>> 170 << *(aParticleChange.GetPolarizationChange()) << G4endl;
>> 171 G4cout << "New Momentum Direction: "
>> 172 << NewMomentumDirection << G4endl;
>> 173 G4cout << "Momentum Change: "
>> 174 << *(aParticleChange.GetMomentumChange()) << G4endl;
>> 175 }
>> 176
>> 177 return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
214 } 178 }
215 179
216 //....oooOO0OOooo........oooOO0OOooo........oo << 180 // BuildThePhysicsTable for the Rayleigh Scattering process
217 G4double G4OpRayleigh::GetMeanFreePath(const G << 181 // --------------------------------------------------------
218 G4Force << 182 //
>> 183 void G4OpRayleigh::BuildThePhysicsTable()
219 { 184 {
220 auto rayleigh = static_cast<G4PhysicsFreeVec << 185 // Builds a table of scattering lengths for each material
221 (*thePhysicsTable)(aTrack.GetMaterial()- << 186
>> 187 if (thePhysicsTable) return;
>> 188
>> 189 const G4MaterialTable* theMaterialTable=
>> 190 G4Material::GetMaterialTable();
>> 191 G4int numOfMaterials = theMaterialTable->length();
>> 192
>> 193 // create a new physics table
>> 194
>> 195 thePhysicsTable = new G4PhysicsTable(numOfMaterials);
>> 196
>> 197 // loop for materials
>> 198
>> 199 for (G4int i=0 ; i < numOfMaterials; i++)
>> 200 {
>> 201 G4PhysicsOrderedFreeVector* ScatteringLengths =
>> 202 new G4PhysicsOrderedFreeVector();
222 203
223 G4double rsLength = DBL_MAX; << 204 if ((*theMaterialTable)[i]->GetName() == "Water")
224 if(rayleigh) << 205 {
225 { << 206 G4MaterialPropertiesTable *MaterialPT =
226 rsLength = rayleigh->Value(aTrack.GetDynam << 207 (*theMaterialTable)[i]->GetMaterialPropertiesTable();
227 idx_rslength); << 208 // Call utility routine to Generate
228 } << 209 // Rayleigh Scattering Lengths
229 return rsLength; << 210 ScatteringLengths =
>> 211 RayleighAttenuationLengthGenerator(MaterialPT);
>> 212 }
>> 213
>> 214 thePhysicsTable->insertAt(i,ScatteringLengths);
>> 215 }
230 } 216 }
231 217
232 //....oooOO0OOooo........oooOO0OOooo........oo << 218 // GetMeanFreePath()
233 G4PhysicsFreeVector* G4OpRayleigh::CalculateRa << 219 // -----------------
234 const G4Material* material) const << 220 //
>> 221 G4double G4OpRayleigh::GetMeanFreePath(const G4Track& aTrack,
>> 222 G4double ,
>> 223 G4ForceCondition* )
235 { 224 {
236 G4MaterialPropertiesTable* MPT = material->G << 225 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
>> 226 const G4Material* aMaterial = aTrack.GetMaterial();
>> 227
>> 228 G4double thePhotonMomentum = aParticle->GetTotalMomentum();
>> 229
>> 230 G4double AttenuationLength = DBL_MAX;
237 231
238 // Retrieve the beta_T or isothermal compres << 232 if (aMaterial->GetName() == "Water") {
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 } <<
300 233
301 rayleighMFPs->InsertValues(energy, meanFre << 234 G4bool isOutRange;
302 } << 235
>> 236 AttenuationLength =
>> 237 (*thePhysicsTable)(aMaterial->GetIndex())->
>> 238 GetValue(thePhotonMomentum, isOutRange);
>> 239 }
>> 240 else {
>> 241
>> 242 G4MaterialPropertiesTable* aMaterialPropertyTable =
>> 243 aMaterial->GetMaterialPropertiesTable();
>> 244
>> 245 if(aMaterialPropertyTable){
>> 246 G4MaterialPropertyVector* AttenuationLengthVector =
>> 247 aMaterialPropertyTable->GetProperty("RAYLEIGH");
>> 248 if(AttenuationLengthVector){
>> 249 AttenuationLength = AttenuationLengthVector ->
>> 250 GetProperty(thePhotonMomentum);
>> 251 }
>> 252 else{
>> 253 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 254 }
>> 255 }
>> 256 else{
>> 257 // G4cout << "No Rayleigh scattering length specified" << G4endl;
>> 258 }
>> 259 }
303 260
304 return rayleighMFPs; << 261 return AttenuationLength;
305 } 262 }
306 263
307 //....oooOO0OOooo........oooOO0OOooo........oo << 264 // RayleighAttenuationLengthGenerator()
308 void G4OpRayleigh::SetVerboseLevel(G4int verbo << 265 // ------------------------------------
>> 266 // Private method to compute Rayleigh Scattering Lengths (for water)
>> 267 //
>> 268 G4PhysicsOrderedFreeVector*
>> 269 G4OpRayleigh::RayleighAttenuationLengthGenerator(G4MaterialPropertiesTable *aMPT)
309 { 270 {
310 verboseLevel = verbose; << 271 // Physical Constants
311 G4OpticalParameters::Instance()->SetRayleigh << 272
>> 273 // isothermal compressibility of water
>> 274 G4double betat = 7.658e-23*m3/MeV;
>> 275
>> 276 // K Boltzman
>> 277 G4double kboltz = 8.61739e-11*MeV/kelvin;
>> 278
>> 279 // Temperature of water is 10 degrees celsius
>> 280 // conversion to kelvin:
>> 281 // TCelsius = TKelvin - 273.15 => 273.15 + 10 = 283.15
>> 282 G4double temp = 283.15*kelvin;
>> 283
>> 284 // Retrieve vectors for refraction index
>> 285 // and photon momentum from the material properties table
>> 286
>> 287 G4MaterialPropertyVector* Rindex = aMPT->GetProperty("RINDEX");
>> 288
>> 289 G4double refsq;
>> 290 G4double e;
>> 291 G4double xlambda;
>> 292 G4double c1, c2, c3, c4;
>> 293 G4double Dist;
>> 294 G4double refraction_index;
>> 295
>> 296 G4double no_unit = 1.0;
>> 297
>> 298 G4PhysicsOrderedFreeVector *RayleighScatteringLengths =
>> 299 new G4PhysicsOrderedFreeVector();
>> 300 Rindex->ResetIterator();
>> 301
>> 302 while (++(*Rindex)) {
>> 303
>> 304 e = (Rindex->GetPhotonMomentum());
>> 305
>> 306 refraction_index = Rindex->GetProperty();
>> 307 refsq = refraction_index*refraction_index;
>> 308 xlambda = h_Planck*c_light/e;
>> 309
>> 310 if (verboseLevel>0) {
>> 311 G4cout << Rindex->GetPhotonMomentum() << " MeV\t";
>> 312 G4cout << xlambda << " mm\t";
>> 313 }
>> 314
>> 315 c1 = 1 / (6.0 * pi);
>> 316 c2 = pow((2.0 * pi / xlambda), 4);
>> 317 c3 = pow( ( (refsq - 1.0) * (refsq + 2.0) / 3.0 ), 2);
>> 318 c4 = betat * temp * kboltz;
>> 319
>> 320 Dist = 1.0 / (c1*c2*c3*c4);
>> 321
>> 322 if (verboseLevel>0) {
>> 323 G4cout << Dist << " mm" << G4endl;
>> 324 }
>> 325 RayleighScatteringLengths->
>> 326 InsertValues(Rindex->GetPhotonMomentum(), Dist);
>> 327 }
>> 328
>> 329 return RayleighScatteringLengths;
312 } 330 }
313 331