[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | //////////////////////////////////////////////////////////////////////// |
---|
| 27 | // Optical Photon Boundary Process Class Implementation |
---|
| 28 | //////////////////////////////////////////////////////////////////////// |
---|
| 29 | // |
---|
| 30 | // File: G4OpBoundaryProcess.cc |
---|
| 31 | // Description: Discrete Process -- reflection/refraction at |
---|
| 32 | // optical interfaces |
---|
| 33 | // Version: 1.1 |
---|
| 34 | // Created: 1997-06-18 |
---|
| 35 | // Modified: 1998-05-25 - Correct parallel component of polarization |
---|
| 36 | // (thanks to: Stefano Magni + Giovanni Pieri) |
---|
| 37 | // 1998-05-28 - NULL Rindex pointer before reuse |
---|
| 38 | // (thanks to: Stefano Magni) |
---|
| 39 | // 1998-06-11 - delete *sint1 in oblique reflection |
---|
| 40 | // (thanks to: Giovanni Pieri) |
---|
| 41 | // 1998-06-19 - move from GetLocalExitNormal() to the new |
---|
| 42 | // method: GetLocalExitNormal(&valid) to get |
---|
| 43 | // the surface normal in all cases |
---|
| 44 | // 1998-11-07 - NULL OpticalSurface pointer before use |
---|
| 45 | // comparison not sharp for: std::abs(cost1) < 1.0 |
---|
| 46 | // remove sin1, sin2 in lines 556,567 |
---|
| 47 | // (thanks to Stefano Magni) |
---|
| 48 | // 1999-10-10 - Accommodate changes done in DoAbsorption by |
---|
| 49 | // changing logic in DielectricMetal |
---|
| 50 | // 2001-10-18 - avoid Linux (gcc-2.95.2) warning about variables |
---|
| 51 | // might be used uninitialized in this function |
---|
| 52 | // moved E2_perp, E2_parl and E2_total out of 'if' |
---|
| 53 | // 2003-11-27 - Modified line 168-9 to reflect changes made to |
---|
| 54 | // G4OpticalSurface class ( by Fan Lei) |
---|
| 55 | // 2004-02-02 - Set theStatus = Undefined at start of DoIt |
---|
| 56 | // 2005-07-28 - add G4ProcessType to constructor |
---|
| 57 | // 2006-11-04 - add capability of calculating the reflectivity |
---|
| 58 | // off a metal surface by way of a complex index |
---|
| 59 | // of refraction - Thanks to Sehwook Lee and John |
---|
| 60 | // Hauptman (Dept. of Physics - Iowa State Univ.) |
---|
| 61 | // |
---|
| 62 | // Author: Peter Gumplinger |
---|
| 63 | // adopted from work by Werner Keil - April 2/96 |
---|
| 64 | // mail: gum@triumf.ca |
---|
| 65 | // |
---|
| 66 | //////////////////////////////////////////////////////////////////////// |
---|
| 67 | |
---|
| 68 | #include "G4ios.hh" |
---|
[963] | 69 | #include "G4OpProcessSubType.hh" |
---|
| 70 | |
---|
[819] | 71 | #include "G4OpBoundaryProcess.hh" |
---|
| 72 | #include "G4GeometryTolerance.hh" |
---|
| 73 | |
---|
| 74 | ///////////////////////// |
---|
| 75 | // Class Implementation |
---|
| 76 | ///////////////////////// |
---|
| 77 | |
---|
| 78 | ////////////// |
---|
| 79 | // Operators |
---|
| 80 | ////////////// |
---|
| 81 | |
---|
| 82 | // G4OpBoundaryProcess::operator=(const G4OpBoundaryProcess &right) |
---|
| 83 | // { |
---|
| 84 | // } |
---|
| 85 | |
---|
| 86 | ///////////////// |
---|
| 87 | // Constructors |
---|
| 88 | ///////////////// |
---|
| 89 | |
---|
| 90 | G4OpBoundaryProcess::G4OpBoundaryProcess(const G4String& processName, |
---|
| 91 | G4ProcessType type) |
---|
| 92 | : G4VDiscreteProcess(processName, type) |
---|
| 93 | { |
---|
| 94 | if ( verboseLevel > 0) { |
---|
| 95 | G4cout << GetProcessName() << " is created " << G4endl; |
---|
| 96 | } |
---|
| 97 | |
---|
[963] | 98 | SetProcessSubType(fOpBoundary); |
---|
| 99 | |
---|
[819] | 100 | theStatus = Undefined; |
---|
| 101 | theModel = glisur; |
---|
| 102 | theFinish = polished; |
---|
| 103 | theReflectivity = 1.; |
---|
| 104 | theEfficiency = 0.; |
---|
| 105 | |
---|
| 106 | prob_sl = 0.; |
---|
| 107 | prob_ss = 0.; |
---|
| 108 | prob_bs = 0.; |
---|
| 109 | |
---|
| 110 | kCarTolerance = G4GeometryTolerance::GetInstance() |
---|
| 111 | ->GetSurfaceTolerance(); |
---|
| 112 | |
---|
| 113 | } |
---|
| 114 | |
---|
| 115 | // G4OpBoundaryProcess::G4OpBoundaryProcess(const G4OpBoundaryProcess &right) |
---|
| 116 | // { |
---|
| 117 | // } |
---|
| 118 | |
---|
| 119 | //////////////// |
---|
| 120 | // Destructors |
---|
| 121 | //////////////// |
---|
| 122 | |
---|
| 123 | G4OpBoundaryProcess::~G4OpBoundaryProcess(){} |
---|
| 124 | |
---|
| 125 | //////////// |
---|
| 126 | // Methods |
---|
| 127 | //////////// |
---|
| 128 | |
---|
| 129 | // PostStepDoIt |
---|
| 130 | // ------------ |
---|
| 131 | // |
---|
| 132 | G4VParticleChange* |
---|
| 133 | G4OpBoundaryProcess::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep) |
---|
| 134 | { |
---|
| 135 | theStatus = Undefined; |
---|
| 136 | |
---|
| 137 | aParticleChange.Initialize(aTrack); |
---|
| 138 | |
---|
| 139 | G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint(); |
---|
| 140 | G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint(); |
---|
| 141 | |
---|
| 142 | if (pPostStepPoint->GetStepStatus() != fGeomBoundary){ |
---|
| 143 | theStatus = NotAtBoundary; |
---|
| 144 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 145 | } |
---|
| 146 | if (aTrack.GetStepLength()<=kCarTolerance/2){ |
---|
| 147 | theStatus = StepTooSmall; |
---|
| 148 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 149 | } |
---|
| 150 | |
---|
| 151 | Material1 = pPreStepPoint -> GetMaterial(); |
---|
| 152 | Material2 = pPostStepPoint -> GetMaterial(); |
---|
| 153 | |
---|
| 154 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
---|
| 155 | |
---|
| 156 | thePhotonMomentum = aParticle->GetTotalMomentum(); |
---|
| 157 | OldMomentum = aParticle->GetMomentumDirection(); |
---|
| 158 | OldPolarization = aParticle->GetPolarization(); |
---|
| 159 | |
---|
| 160 | G4ThreeVector theGlobalPoint = pPostStepPoint->GetPosition(); |
---|
| 161 | |
---|
| 162 | G4Navigator* theNavigator = |
---|
| 163 | G4TransportationManager::GetTransportationManager()-> |
---|
| 164 | GetNavigatorForTracking(); |
---|
| 165 | |
---|
| 166 | G4ThreeVector theLocalPoint = theNavigator-> |
---|
| 167 | GetGlobalToLocalTransform(). |
---|
| 168 | TransformPoint(theGlobalPoint); |
---|
| 169 | |
---|
| 170 | G4ThreeVector theLocalNormal; // Normal points back into volume |
---|
| 171 | |
---|
| 172 | G4bool valid; |
---|
| 173 | theLocalNormal = theNavigator->GetLocalExitNormal(&valid); |
---|
| 174 | |
---|
| 175 | if (valid) { |
---|
| 176 | theLocalNormal = -theLocalNormal; |
---|
| 177 | } |
---|
| 178 | else { |
---|
| 179 | G4cerr << " G4OpBoundaryProcess/PostStepDoIt(): " |
---|
| 180 | << " The Navigator reports that it returned an invalid normal" |
---|
| 181 | << G4endl; |
---|
| 182 | } |
---|
| 183 | |
---|
| 184 | theGlobalNormal = theNavigator->GetLocalToGlobalTransform(). |
---|
| 185 | TransformAxis(theLocalNormal); |
---|
| 186 | |
---|
| 187 | if (OldMomentum * theGlobalNormal > 0.0) { |
---|
| 188 | #ifdef G4DEBUG_OPTICAL |
---|
| 189 | G4cerr << " G4OpBoundaryProcess/PostStepDoIt(): " |
---|
| 190 | << " theGlobalNormal points the wrong direction " |
---|
| 191 | << G4endl; |
---|
| 192 | #endif |
---|
| 193 | theGlobalNormal = -theGlobalNormal; |
---|
| 194 | } |
---|
| 195 | |
---|
| 196 | G4MaterialPropertiesTable* aMaterialPropertiesTable; |
---|
| 197 | G4MaterialPropertyVector* Rindex; |
---|
| 198 | |
---|
| 199 | aMaterialPropertiesTable = Material1->GetMaterialPropertiesTable(); |
---|
| 200 | if (aMaterialPropertiesTable) { |
---|
| 201 | Rindex = aMaterialPropertiesTable->GetProperty("RINDEX"); |
---|
| 202 | } |
---|
| 203 | else { |
---|
| 204 | theStatus = NoRINDEX; |
---|
| 205 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 206 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 207 | } |
---|
| 208 | |
---|
| 209 | if (Rindex) { |
---|
| 210 | Rindex1 = Rindex->GetProperty(thePhotonMomentum); |
---|
| 211 | } |
---|
| 212 | else { |
---|
| 213 | theStatus = NoRINDEX; |
---|
| 214 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 215 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 216 | } |
---|
| 217 | |
---|
| 218 | theModel = glisur; |
---|
| 219 | theFinish = polished; |
---|
| 220 | |
---|
| 221 | G4SurfaceType type = dielectric_dielectric; |
---|
| 222 | |
---|
| 223 | Rindex = NULL; |
---|
| 224 | OpticalSurface = NULL; |
---|
| 225 | |
---|
[963] | 226 | G4LogicalSurface* Surface = NULL; |
---|
[819] | 227 | |
---|
[963] | 228 | Surface = G4LogicalBorderSurface::GetSurface |
---|
| 229 | (pPreStepPoint ->GetPhysicalVolume(), |
---|
| 230 | pPostStepPoint->GetPhysicalVolume()); |
---|
| 231 | |
---|
[819] | 232 | if (Surface == NULL){ |
---|
| 233 | G4bool enteredDaughter=(pPostStepPoint->GetPhysicalVolume() |
---|
| 234 | ->GetMotherLogical() == |
---|
| 235 | pPreStepPoint->GetPhysicalVolume() |
---|
| 236 | ->GetLogicalVolume()); |
---|
| 237 | if(enteredDaughter){ |
---|
| 238 | Surface = G4LogicalSkinSurface::GetSurface |
---|
| 239 | (pPostStepPoint->GetPhysicalVolume()-> |
---|
| 240 | GetLogicalVolume()); |
---|
| 241 | if(Surface == NULL) |
---|
| 242 | Surface = G4LogicalSkinSurface::GetSurface |
---|
| 243 | (pPreStepPoint->GetPhysicalVolume()-> |
---|
| 244 | GetLogicalVolume()); |
---|
| 245 | } |
---|
| 246 | else { |
---|
| 247 | Surface = G4LogicalSkinSurface::GetSurface |
---|
| 248 | (pPreStepPoint->GetPhysicalVolume()-> |
---|
| 249 | GetLogicalVolume()); |
---|
| 250 | if(Surface == NULL) |
---|
| 251 | Surface = G4LogicalSkinSurface::GetSurface |
---|
| 252 | (pPostStepPoint->GetPhysicalVolume()-> |
---|
| 253 | GetLogicalVolume()); |
---|
| 254 | } |
---|
| 255 | } |
---|
| 256 | |
---|
[963] | 257 | if (Surface) OpticalSurface = |
---|
| 258 | dynamic_cast <G4OpticalSurface*> (Surface->GetSurfaceProperty()); |
---|
[819] | 259 | |
---|
| 260 | if (OpticalSurface) { |
---|
| 261 | |
---|
| 262 | type = OpticalSurface->GetType(); |
---|
| 263 | theModel = OpticalSurface->GetModel(); |
---|
| 264 | theFinish = OpticalSurface->GetFinish(); |
---|
| 265 | |
---|
| 266 | aMaterialPropertiesTable = OpticalSurface-> |
---|
| 267 | GetMaterialPropertiesTable(); |
---|
| 268 | |
---|
| 269 | if (aMaterialPropertiesTable) { |
---|
| 270 | |
---|
| 271 | if (theFinish == polishedbackpainted || |
---|
| 272 | theFinish == groundbackpainted ) { |
---|
| 273 | Rindex = aMaterialPropertiesTable->GetProperty("RINDEX"); |
---|
| 274 | if (Rindex) { |
---|
| 275 | Rindex2 = Rindex->GetProperty(thePhotonMomentum); |
---|
| 276 | } |
---|
| 277 | else { |
---|
| 278 | theStatus = NoRINDEX; |
---|
| 279 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 280 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 281 | } |
---|
| 282 | } |
---|
| 283 | |
---|
| 284 | G4MaterialPropertyVector* PropertyPointer; |
---|
| 285 | G4MaterialPropertyVector* PropertyPointer1; |
---|
| 286 | G4MaterialPropertyVector* PropertyPointer2; |
---|
| 287 | |
---|
| 288 | PropertyPointer = |
---|
| 289 | aMaterialPropertiesTable->GetProperty("REFLECTIVITY"); |
---|
| 290 | PropertyPointer1 = |
---|
| 291 | aMaterialPropertiesTable->GetProperty("REALRINDEX"); |
---|
| 292 | PropertyPointer2 = |
---|
| 293 | aMaterialPropertiesTable->GetProperty("IMAGINARYRINDEX"); |
---|
| 294 | |
---|
| 295 | iTE = 1; |
---|
| 296 | iTM = 1; |
---|
| 297 | |
---|
| 298 | if (PropertyPointer) { |
---|
| 299 | |
---|
| 300 | theReflectivity = |
---|
| 301 | PropertyPointer->GetProperty(thePhotonMomentum); |
---|
| 302 | |
---|
| 303 | } else if (PropertyPointer1 && PropertyPointer2) { |
---|
| 304 | |
---|
| 305 | G4double RealRindex = |
---|
| 306 | PropertyPointer1->GetProperty(thePhotonMomentum); |
---|
| 307 | G4double ImaginaryRindex = |
---|
| 308 | PropertyPointer2->GetProperty(thePhotonMomentum); |
---|
| 309 | |
---|
| 310 | // calculate FacetNormal |
---|
| 311 | if ( theFinish == ground ) { |
---|
| 312 | theFacetNormal = |
---|
| 313 | GetFacetNormal(OldMomentum, theGlobalNormal); |
---|
| 314 | } else { |
---|
| 315 | theFacetNormal = theGlobalNormal; |
---|
| 316 | } |
---|
| 317 | |
---|
| 318 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
| 319 | cost1 = -PdotN; |
---|
| 320 | |
---|
| 321 | if (std::abs(cost1) < 1.0 - kCarTolerance) { |
---|
| 322 | sint1 = std::sqrt(1. - cost1*cost1); |
---|
| 323 | } else { |
---|
| 324 | sint1 = 0.0; |
---|
| 325 | } |
---|
| 326 | |
---|
| 327 | G4ThreeVector A_trans, A_paral, E1pp, E1pl; |
---|
| 328 | G4double E1_perp, E1_parl; |
---|
| 329 | |
---|
| 330 | if (sint1 > 0.0 ) { |
---|
| 331 | A_trans = OldMomentum.cross(theFacetNormal); |
---|
| 332 | A_trans = A_trans.unit(); |
---|
| 333 | E1_perp = OldPolarization * A_trans; |
---|
| 334 | E1pp = E1_perp * A_trans; |
---|
| 335 | E1pl = OldPolarization - E1pp; |
---|
| 336 | E1_parl = E1pl.mag(); |
---|
| 337 | } |
---|
| 338 | else { |
---|
| 339 | A_trans = OldPolarization; |
---|
| 340 | // Here we Follow Jackson's conventions and we set the |
---|
| 341 | // parallel component = 1 in case of a ray perpendicular |
---|
| 342 | // to the surface |
---|
| 343 | E1_perp = 0.0; |
---|
| 344 | E1_parl = 1.0; |
---|
| 345 | } |
---|
| 346 | |
---|
| 347 | //calculate incident angle |
---|
| 348 | G4double incidentangle = GetIncidentAngle(); |
---|
| 349 | |
---|
| 350 | //calculate the reflectivity depending on incident angle, |
---|
| 351 | //polarization and complex refractive |
---|
| 352 | |
---|
| 353 | theReflectivity = |
---|
| 354 | GetReflectivity(E1_perp, E1_parl, incidentangle, |
---|
| 355 | RealRindex, ImaginaryRindex); |
---|
| 356 | |
---|
| 357 | } else { |
---|
| 358 | theReflectivity = 1.0; |
---|
| 359 | } |
---|
| 360 | |
---|
| 361 | PropertyPointer = |
---|
| 362 | aMaterialPropertiesTable->GetProperty("EFFICIENCY"); |
---|
| 363 | if (PropertyPointer) { |
---|
| 364 | theEfficiency = |
---|
| 365 | PropertyPointer->GetProperty(thePhotonMomentum); |
---|
| 366 | } else { |
---|
| 367 | theEfficiency = 0.0; |
---|
| 368 | } |
---|
| 369 | |
---|
| 370 | if ( theModel == unified ) { |
---|
| 371 | PropertyPointer = |
---|
| 372 | aMaterialPropertiesTable->GetProperty("SPECULARLOBECONSTANT"); |
---|
| 373 | if (PropertyPointer) { |
---|
| 374 | prob_sl = |
---|
| 375 | PropertyPointer->GetProperty(thePhotonMomentum); |
---|
| 376 | } else { |
---|
| 377 | prob_sl = 0.0; |
---|
| 378 | } |
---|
| 379 | |
---|
| 380 | PropertyPointer = |
---|
| 381 | aMaterialPropertiesTable->GetProperty("SPECULARSPIKECONSTANT"); |
---|
| 382 | if (PropertyPointer) { |
---|
| 383 | prob_ss = |
---|
| 384 | PropertyPointer->GetProperty(thePhotonMomentum); |
---|
| 385 | } else { |
---|
| 386 | prob_ss = 0.0; |
---|
| 387 | } |
---|
| 388 | |
---|
| 389 | PropertyPointer = |
---|
| 390 | aMaterialPropertiesTable->GetProperty("BACKSCATTERCONSTANT"); |
---|
| 391 | if (PropertyPointer) { |
---|
| 392 | prob_bs = |
---|
| 393 | PropertyPointer->GetProperty(thePhotonMomentum); |
---|
| 394 | } else { |
---|
| 395 | prob_bs = 0.0; |
---|
| 396 | } |
---|
| 397 | } |
---|
| 398 | } |
---|
| 399 | else if (theFinish == polishedbackpainted || |
---|
| 400 | theFinish == groundbackpainted ) { |
---|
| 401 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 402 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 403 | } |
---|
| 404 | } |
---|
| 405 | |
---|
| 406 | if (type == dielectric_dielectric ) { |
---|
| 407 | if (theFinish == polished || theFinish == ground ) { |
---|
| 408 | |
---|
| 409 | if (Material1 == Material2){ |
---|
| 410 | theStatus = SameMaterial; |
---|
| 411 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 412 | } |
---|
| 413 | aMaterialPropertiesTable = |
---|
| 414 | Material2->GetMaterialPropertiesTable(); |
---|
| 415 | if (aMaterialPropertiesTable) |
---|
| 416 | Rindex = aMaterialPropertiesTable->GetProperty("RINDEX"); |
---|
| 417 | if (Rindex) { |
---|
| 418 | Rindex2 = Rindex->GetProperty(thePhotonMomentum); |
---|
| 419 | } |
---|
| 420 | else { |
---|
| 421 | theStatus = NoRINDEX; |
---|
| 422 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 423 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 424 | } |
---|
| 425 | } |
---|
| 426 | } |
---|
| 427 | |
---|
| 428 | if ( verboseLevel > 0 ) { |
---|
| 429 | G4cout << " Photon at Boundary! " << G4endl; |
---|
| 430 | G4cout << " Old Momentum Direction: " << OldMomentum << G4endl; |
---|
| 431 | G4cout << " Old Polarization: " << OldPolarization << G4endl; |
---|
| 432 | } |
---|
| 433 | |
---|
| 434 | if (type == dielectric_metal) { |
---|
| 435 | |
---|
| 436 | DielectricMetal(); |
---|
| 437 | |
---|
[963] | 438 | // Uncomment the following lines if you wish to have |
---|
| 439 | // Transmission instead of Absorption |
---|
| 440 | // if (theStatus == Absorption) { |
---|
| 441 | // return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 442 | // } |
---|
| 443 | |
---|
[819] | 444 | } |
---|
| 445 | else if (type == dielectric_dielectric) { |
---|
| 446 | |
---|
| 447 | if ( theFinish == polishedfrontpainted || |
---|
| 448 | theFinish == groundfrontpainted ) { |
---|
| 449 | |
---|
| 450 | if( !G4BooleanRand(theReflectivity) ) { |
---|
| 451 | DoAbsorption(); |
---|
| 452 | } |
---|
| 453 | else { |
---|
| 454 | if ( theFinish == groundfrontpainted ) |
---|
| 455 | theStatus = LambertianReflection; |
---|
| 456 | DoReflection(); |
---|
| 457 | } |
---|
| 458 | } |
---|
| 459 | else { |
---|
| 460 | DielectricDielectric(); |
---|
| 461 | } |
---|
| 462 | } |
---|
| 463 | else { |
---|
| 464 | |
---|
| 465 | G4cerr << " Error: G4BoundaryProcess: illegal boundary type " << G4endl; |
---|
| 466 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 467 | |
---|
| 468 | } |
---|
| 469 | |
---|
| 470 | NewMomentum = NewMomentum.unit(); |
---|
| 471 | NewPolarization = NewPolarization.unit(); |
---|
| 472 | |
---|
| 473 | if ( verboseLevel > 0) { |
---|
| 474 | G4cout << " New Momentum Direction: " << NewMomentum << G4endl; |
---|
| 475 | G4cout << " New Polarization: " << NewPolarization << G4endl; |
---|
| 476 | if ( theStatus == Undefined ) |
---|
| 477 | G4cout << " *** Undefined *** " << G4endl; |
---|
| 478 | if ( theStatus == FresnelRefraction ) |
---|
| 479 | G4cout << " *** FresnelRefraction *** " << G4endl; |
---|
| 480 | if ( theStatus == FresnelReflection ) |
---|
| 481 | G4cout << " *** FresnelReflection *** " << G4endl; |
---|
| 482 | if ( theStatus == TotalInternalReflection ) |
---|
| 483 | G4cout << " *** TotalInternalReflection *** " << G4endl; |
---|
| 484 | if ( theStatus == LambertianReflection ) |
---|
| 485 | G4cout << " *** LambertianReflection *** " << G4endl; |
---|
| 486 | if ( theStatus == LobeReflection ) |
---|
| 487 | G4cout << " *** LobeReflection *** " << G4endl; |
---|
| 488 | if ( theStatus == SpikeReflection ) |
---|
| 489 | G4cout << " *** SpikeReflection *** " << G4endl; |
---|
| 490 | if ( theStatus == BackScattering ) |
---|
| 491 | G4cout << " *** BackScattering *** " << G4endl; |
---|
| 492 | if ( theStatus == Absorption ) |
---|
| 493 | G4cout << " *** Absorption *** " << G4endl; |
---|
| 494 | if ( theStatus == Detection ) |
---|
| 495 | G4cout << " *** Detection *** " << G4endl; |
---|
| 496 | if ( theStatus == NotAtBoundary ) |
---|
| 497 | G4cout << " *** NotAtBoundary *** " << G4endl; |
---|
| 498 | if ( theStatus == SameMaterial ) |
---|
| 499 | G4cout << " *** SameMaterial *** " << G4endl; |
---|
| 500 | if ( theStatus == StepTooSmall ) |
---|
| 501 | G4cout << " *** StepTooSmall *** " << G4endl; |
---|
| 502 | if ( theStatus == NoRINDEX ) |
---|
| 503 | G4cout << " *** NoRINDEX *** " << G4endl; |
---|
| 504 | } |
---|
| 505 | |
---|
| 506 | aParticleChange.ProposeMomentumDirection(NewMomentum); |
---|
| 507 | aParticleChange.ProposePolarization(NewPolarization); |
---|
| 508 | |
---|
| 509 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 510 | } |
---|
| 511 | |
---|
| 512 | G4ThreeVector |
---|
| 513 | G4OpBoundaryProcess::GetFacetNormal(const G4ThreeVector& Momentum, |
---|
| 514 | const G4ThreeVector& Normal ) const |
---|
| 515 | { |
---|
| 516 | G4ThreeVector FacetNormal; |
---|
| 517 | |
---|
| 518 | if (theModel == unified) { |
---|
| 519 | |
---|
| 520 | /* This function code alpha to a random value taken from the |
---|
| 521 | distribution p(alpha) = g(alpha; 0, sigma_alpha)*std::sin(alpha), |
---|
| 522 | for alpha > 0 and alpha < 90, where g(alpha; 0, sigma_alpha) |
---|
| 523 | is a gaussian distribution with mean 0 and standard deviation |
---|
| 524 | sigma_alpha. */ |
---|
| 525 | |
---|
| 526 | G4double alpha; |
---|
| 527 | |
---|
| 528 | G4double sigma_alpha = 0.0; |
---|
| 529 | if (OpticalSurface) sigma_alpha = OpticalSurface->GetSigmaAlpha(); |
---|
| 530 | |
---|
| 531 | G4double f_max = std::min(1.0,4.*sigma_alpha); |
---|
| 532 | |
---|
| 533 | do { |
---|
| 534 | do { |
---|
| 535 | alpha = G4RandGauss::shoot(0.0,sigma_alpha); |
---|
| 536 | } while (G4UniformRand()*f_max > std::sin(alpha) || alpha >= halfpi ); |
---|
| 537 | |
---|
| 538 | G4double phi = G4UniformRand()*twopi; |
---|
| 539 | |
---|
| 540 | G4double SinAlpha = std::sin(alpha); |
---|
| 541 | G4double CosAlpha = std::cos(alpha); |
---|
| 542 | G4double SinPhi = std::sin(phi); |
---|
| 543 | G4double CosPhi = std::cos(phi); |
---|
| 544 | |
---|
| 545 | G4double unit_x = SinAlpha * CosPhi; |
---|
| 546 | G4double unit_y = SinAlpha * SinPhi; |
---|
| 547 | G4double unit_z = CosAlpha; |
---|
| 548 | |
---|
| 549 | FacetNormal.setX(unit_x); |
---|
| 550 | FacetNormal.setY(unit_y); |
---|
| 551 | FacetNormal.setZ(unit_z); |
---|
| 552 | |
---|
| 553 | G4ThreeVector tmpNormal = Normal; |
---|
| 554 | |
---|
| 555 | FacetNormal.rotateUz(tmpNormal); |
---|
| 556 | } while (Momentum * FacetNormal >= 0.0); |
---|
| 557 | } |
---|
| 558 | else { |
---|
| 559 | |
---|
| 560 | G4double polish = 1.0; |
---|
| 561 | if (OpticalSurface) polish = OpticalSurface->GetPolish(); |
---|
| 562 | |
---|
| 563 | if (polish < 1.0) { |
---|
| 564 | do { |
---|
| 565 | G4ThreeVector smear; |
---|
| 566 | do { |
---|
| 567 | smear.setX(2.*G4UniformRand()-1.0); |
---|
| 568 | smear.setY(2.*G4UniformRand()-1.0); |
---|
| 569 | smear.setZ(2.*G4UniformRand()-1.0); |
---|
| 570 | } while (smear.mag()>1.0); |
---|
| 571 | smear = (1.-polish) * smear; |
---|
| 572 | FacetNormal = Normal + smear; |
---|
| 573 | } while (Momentum * FacetNormal >= 0.0); |
---|
| 574 | FacetNormal = FacetNormal.unit(); |
---|
| 575 | } |
---|
| 576 | else { |
---|
| 577 | FacetNormal = Normal; |
---|
| 578 | } |
---|
| 579 | } |
---|
| 580 | return FacetNormal; |
---|
| 581 | } |
---|
| 582 | |
---|
| 583 | void G4OpBoundaryProcess::DielectricMetal() |
---|
| 584 | { |
---|
| 585 | G4int n = 0; |
---|
| 586 | |
---|
| 587 | do { |
---|
| 588 | |
---|
| 589 | n++; |
---|
| 590 | |
---|
| 591 | if( !G4BooleanRand(theReflectivity) && n == 1 ) { |
---|
| 592 | |
---|
[963] | 593 | // Comment out DoAbsorption and uncomment theStatus = Absorption; |
---|
| 594 | // if you wish to have Transmission instead of Absorption |
---|
| 595 | |
---|
[819] | 596 | DoAbsorption(); |
---|
[963] | 597 | // theStatus = Absorption; |
---|
[819] | 598 | break; |
---|
| 599 | |
---|
| 600 | } |
---|
| 601 | else { |
---|
| 602 | |
---|
| 603 | if ( theModel == glisur || theFinish == polished ) { |
---|
| 604 | |
---|
| 605 | DoReflection(); |
---|
| 606 | |
---|
| 607 | } else { |
---|
| 608 | |
---|
| 609 | if ( n == 1 ) ChooseReflection(); |
---|
| 610 | |
---|
| 611 | if ( theStatus == LambertianReflection ) { |
---|
| 612 | DoReflection(); |
---|
| 613 | } |
---|
| 614 | else if ( theStatus == BackScattering ) { |
---|
| 615 | NewMomentum = -OldMomentum; |
---|
| 616 | NewPolarization = -OldPolarization; |
---|
| 617 | } |
---|
| 618 | else { |
---|
| 619 | |
---|
| 620 | if(theStatus==LobeReflection)theFacetNormal = |
---|
| 621 | GetFacetNormal(OldMomentum,theGlobalNormal); |
---|
| 622 | |
---|
| 623 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
| 624 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
| 625 | G4double EdotN = OldPolarization * theFacetNormal; |
---|
| 626 | |
---|
| 627 | G4ThreeVector A_trans, A_paral; |
---|
| 628 | |
---|
| 629 | if (sint1 > 0.0 ) { |
---|
| 630 | A_trans = OldMomentum.cross(theFacetNormal); |
---|
| 631 | A_trans = A_trans.unit(); |
---|
| 632 | } else { |
---|
| 633 | A_trans = OldPolarization; |
---|
| 634 | } |
---|
| 635 | A_paral = NewMomentum.cross(A_trans); |
---|
| 636 | A_paral = A_paral.unit(); |
---|
| 637 | |
---|
| 638 | if(iTE>0&&iTM>0) { |
---|
| 639 | NewPolarization = |
---|
| 640 | -OldPolarization + (2.*EdotN)*theFacetNormal; |
---|
| 641 | } else if (iTE>0) { |
---|
| 642 | NewPolarization = -A_trans; |
---|
| 643 | } else if (iTM>0) { |
---|
| 644 | NewPolarization = -A_paral; |
---|
| 645 | } |
---|
| 646 | |
---|
| 647 | } |
---|
| 648 | |
---|
| 649 | } |
---|
| 650 | |
---|
| 651 | OldMomentum = NewMomentum; |
---|
| 652 | OldPolarization = NewPolarization; |
---|
| 653 | |
---|
| 654 | } |
---|
| 655 | |
---|
| 656 | } while (NewMomentum * theGlobalNormal < 0.0); |
---|
| 657 | } |
---|
| 658 | |
---|
| 659 | void G4OpBoundaryProcess::DielectricDielectric() |
---|
| 660 | { |
---|
| 661 | G4bool Inside = false; |
---|
| 662 | G4bool Swap = false; |
---|
| 663 | |
---|
| 664 | leap: |
---|
| 665 | |
---|
| 666 | G4bool Through = false; |
---|
| 667 | G4bool Done = false; |
---|
| 668 | |
---|
| 669 | do { |
---|
| 670 | |
---|
| 671 | if (Through) { |
---|
| 672 | Swap = !Swap; |
---|
| 673 | Through = false; |
---|
| 674 | theGlobalNormal = -theGlobalNormal; |
---|
[963] | 675 | G4SwapPtr(Material1,Material2); |
---|
| 676 | G4SwapObj(&Rindex1,&Rindex2); |
---|
[819] | 677 | } |
---|
| 678 | |
---|
| 679 | if ( theFinish == ground || theFinish == groundbackpainted ) { |
---|
| 680 | theFacetNormal = |
---|
| 681 | GetFacetNormal(OldMomentum,theGlobalNormal); |
---|
| 682 | } |
---|
| 683 | else { |
---|
| 684 | theFacetNormal = theGlobalNormal; |
---|
| 685 | } |
---|
| 686 | |
---|
| 687 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
| 688 | G4double EdotN = OldPolarization * theFacetNormal; |
---|
| 689 | |
---|
| 690 | cost1 = - PdotN; |
---|
| 691 | if (std::abs(cost1) < 1.0-kCarTolerance){ |
---|
| 692 | sint1 = std::sqrt(1.-cost1*cost1); |
---|
| 693 | sint2 = sint1*Rindex1/Rindex2; // *** Snell's Law *** |
---|
| 694 | } |
---|
| 695 | else { |
---|
| 696 | sint1 = 0.0; |
---|
| 697 | sint2 = 0.0; |
---|
| 698 | } |
---|
| 699 | |
---|
| 700 | if (sint2 >= 1.0) { |
---|
| 701 | |
---|
| 702 | // Simulate total internal reflection |
---|
| 703 | |
---|
| 704 | if (Swap) Swap = !Swap; |
---|
| 705 | |
---|
| 706 | theStatus = TotalInternalReflection; |
---|
| 707 | |
---|
| 708 | if ( theModel == unified && theFinish != polished ) |
---|
| 709 | ChooseReflection(); |
---|
| 710 | |
---|
| 711 | if ( theStatus == LambertianReflection ) { |
---|
| 712 | DoReflection(); |
---|
| 713 | } |
---|
| 714 | else if ( theStatus == BackScattering ) { |
---|
| 715 | NewMomentum = -OldMomentum; |
---|
| 716 | NewPolarization = -OldPolarization; |
---|
| 717 | } |
---|
| 718 | else { |
---|
| 719 | |
---|
| 720 | PdotN = OldMomentum * theFacetNormal; |
---|
| 721 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
| 722 | EdotN = OldPolarization * theFacetNormal; |
---|
| 723 | NewPolarization = -OldPolarization + (2.*EdotN)*theFacetNormal; |
---|
| 724 | |
---|
| 725 | } |
---|
| 726 | } |
---|
| 727 | else if (sint2 < 1.0) { |
---|
| 728 | |
---|
| 729 | // Calculate amplitude for transmission (Q = P x N) |
---|
| 730 | |
---|
| 731 | if (cost1 > 0.0) { |
---|
| 732 | cost2 = std::sqrt(1.-sint2*sint2); |
---|
| 733 | } |
---|
| 734 | else { |
---|
| 735 | cost2 = -std::sqrt(1.-sint2*sint2); |
---|
| 736 | } |
---|
| 737 | |
---|
| 738 | G4ThreeVector A_trans, A_paral, E1pp, E1pl; |
---|
| 739 | G4double E1_perp, E1_parl; |
---|
| 740 | |
---|
| 741 | if (sint1 > 0.0) { |
---|
| 742 | A_trans = OldMomentum.cross(theFacetNormal); |
---|
| 743 | A_trans = A_trans.unit(); |
---|
| 744 | E1_perp = OldPolarization * A_trans; |
---|
| 745 | E1pp = E1_perp * A_trans; |
---|
| 746 | E1pl = OldPolarization - E1pp; |
---|
| 747 | E1_parl = E1pl.mag(); |
---|
| 748 | } |
---|
| 749 | else { |
---|
| 750 | A_trans = OldPolarization; |
---|
| 751 | // Here we Follow Jackson's conventions and we set the |
---|
| 752 | // parallel component = 1 in case of a ray perpendicular |
---|
| 753 | // to the surface |
---|
| 754 | E1_perp = 0.0; |
---|
| 755 | E1_parl = 1.0; |
---|
| 756 | } |
---|
| 757 | |
---|
| 758 | G4double s1 = Rindex1*cost1; |
---|
| 759 | G4double E2_perp = 2.*s1*E1_perp/(Rindex1*cost1+Rindex2*cost2); |
---|
| 760 | G4double E2_parl = 2.*s1*E1_parl/(Rindex2*cost1+Rindex1*cost2); |
---|
| 761 | G4double E2_total = E2_perp*E2_perp + E2_parl*E2_parl; |
---|
| 762 | G4double s2 = Rindex2*cost2*E2_total; |
---|
| 763 | |
---|
| 764 | G4double TransCoeff; |
---|
| 765 | |
---|
| 766 | if (cost1 != 0.0) { |
---|
| 767 | TransCoeff = s2/s1; |
---|
| 768 | } |
---|
| 769 | else { |
---|
| 770 | TransCoeff = 0.0; |
---|
| 771 | } |
---|
| 772 | |
---|
| 773 | G4double E2_abs, C_parl, C_perp; |
---|
| 774 | |
---|
| 775 | if ( !G4BooleanRand(TransCoeff) ) { |
---|
| 776 | |
---|
| 777 | // Simulate reflection |
---|
| 778 | |
---|
| 779 | if (Swap) Swap = !Swap; |
---|
| 780 | |
---|
| 781 | theStatus = FresnelReflection; |
---|
| 782 | |
---|
| 783 | if ( theModel == unified && theFinish != polished ) |
---|
| 784 | ChooseReflection(); |
---|
| 785 | |
---|
| 786 | if ( theStatus == LambertianReflection ) { |
---|
| 787 | DoReflection(); |
---|
| 788 | } |
---|
| 789 | else if ( theStatus == BackScattering ) { |
---|
| 790 | NewMomentum = -OldMomentum; |
---|
| 791 | NewPolarization = -OldPolarization; |
---|
| 792 | } |
---|
| 793 | else { |
---|
| 794 | |
---|
| 795 | PdotN = OldMomentum * theFacetNormal; |
---|
| 796 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
| 797 | |
---|
| 798 | if (sint1 > 0.0) { // incident ray oblique |
---|
| 799 | |
---|
| 800 | E2_parl = Rindex2*E2_parl/Rindex1 - E1_parl; |
---|
| 801 | E2_perp = E2_perp - E1_perp; |
---|
| 802 | E2_total = E2_perp*E2_perp + E2_parl*E2_parl; |
---|
| 803 | A_paral = NewMomentum.cross(A_trans); |
---|
| 804 | A_paral = A_paral.unit(); |
---|
| 805 | E2_abs = std::sqrt(E2_total); |
---|
| 806 | C_parl = E2_parl/E2_abs; |
---|
| 807 | C_perp = E2_perp/E2_abs; |
---|
| 808 | |
---|
| 809 | NewPolarization = C_parl*A_paral + C_perp*A_trans; |
---|
| 810 | |
---|
| 811 | } |
---|
| 812 | |
---|
| 813 | else { // incident ray perpendicular |
---|
| 814 | |
---|
| 815 | if (Rindex2 > Rindex1) { |
---|
| 816 | NewPolarization = - OldPolarization; |
---|
| 817 | } |
---|
| 818 | else { |
---|
| 819 | NewPolarization = OldPolarization; |
---|
| 820 | } |
---|
| 821 | |
---|
| 822 | } |
---|
| 823 | } |
---|
| 824 | } |
---|
| 825 | else { // photon gets transmitted |
---|
| 826 | |
---|
| 827 | // Simulate transmission/refraction |
---|
| 828 | |
---|
| 829 | Inside = !Inside; |
---|
| 830 | Through = true; |
---|
| 831 | theStatus = FresnelRefraction; |
---|
| 832 | |
---|
| 833 | if (sint1 > 0.0) { // incident ray oblique |
---|
| 834 | |
---|
| 835 | G4double alpha = cost1 - cost2*(Rindex2/Rindex1); |
---|
| 836 | NewMomentum = OldMomentum + alpha*theFacetNormal; |
---|
| 837 | NewMomentum = NewMomentum.unit(); |
---|
| 838 | PdotN = -cost2; |
---|
| 839 | A_paral = NewMomentum.cross(A_trans); |
---|
| 840 | A_paral = A_paral.unit(); |
---|
| 841 | E2_abs = std::sqrt(E2_total); |
---|
| 842 | C_parl = E2_parl/E2_abs; |
---|
| 843 | C_perp = E2_perp/E2_abs; |
---|
| 844 | |
---|
| 845 | NewPolarization = C_parl*A_paral + C_perp*A_trans; |
---|
| 846 | |
---|
| 847 | } |
---|
| 848 | else { // incident ray perpendicular |
---|
| 849 | |
---|
| 850 | NewMomentum = OldMomentum; |
---|
| 851 | NewPolarization = OldPolarization; |
---|
| 852 | |
---|
| 853 | } |
---|
| 854 | } |
---|
| 855 | } |
---|
| 856 | |
---|
| 857 | OldMomentum = NewMomentum.unit(); |
---|
| 858 | OldPolarization = NewPolarization.unit(); |
---|
| 859 | |
---|
| 860 | if (theStatus == FresnelRefraction) { |
---|
| 861 | Done = (NewMomentum * theGlobalNormal <= 0.0); |
---|
| 862 | } |
---|
| 863 | else { |
---|
| 864 | Done = (NewMomentum * theGlobalNormal >= 0.0); |
---|
| 865 | } |
---|
| 866 | |
---|
| 867 | } while (!Done); |
---|
| 868 | |
---|
| 869 | if (Inside && !Swap) { |
---|
| 870 | if( theFinish == polishedbackpainted || |
---|
| 871 | theFinish == groundbackpainted ) { |
---|
| 872 | |
---|
| 873 | if( !G4BooleanRand(theReflectivity) ) { |
---|
| 874 | DoAbsorption(); |
---|
| 875 | } |
---|
| 876 | else { |
---|
| 877 | if (theStatus != FresnelRefraction ) { |
---|
| 878 | theGlobalNormal = -theGlobalNormal; |
---|
| 879 | } |
---|
| 880 | else { |
---|
| 881 | Swap = !Swap; |
---|
[963] | 882 | G4SwapPtr(Material1,Material2); |
---|
| 883 | G4SwapObj(&Rindex1,&Rindex2); |
---|
[819] | 884 | } |
---|
| 885 | if ( theFinish == groundbackpainted ) |
---|
| 886 | theStatus = LambertianReflection; |
---|
| 887 | |
---|
| 888 | DoReflection(); |
---|
| 889 | |
---|
| 890 | theGlobalNormal = -theGlobalNormal; |
---|
| 891 | OldMomentum = NewMomentum; |
---|
| 892 | |
---|
| 893 | goto leap; |
---|
| 894 | } |
---|
| 895 | } |
---|
| 896 | } |
---|
| 897 | } |
---|
| 898 | |
---|
| 899 | // GetMeanFreePath |
---|
| 900 | // --------------- |
---|
| 901 | // |
---|
| 902 | G4double G4OpBoundaryProcess::GetMeanFreePath(const G4Track& , |
---|
| 903 | G4double , |
---|
| 904 | G4ForceCondition* condition) |
---|
| 905 | { |
---|
| 906 | *condition = Forced; |
---|
| 907 | |
---|
| 908 | return DBL_MAX; |
---|
| 909 | } |
---|
| 910 | |
---|
| 911 | G4double G4OpBoundaryProcess::GetIncidentAngle() |
---|
| 912 | { |
---|
| 913 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
| 914 | G4double magP= OldMomentum.mag(); |
---|
| 915 | G4double magN= theFacetNormal.mag(); |
---|
| 916 | G4double incidentangle = pi - std::acos(PdotN/(magP*magN)); |
---|
| 917 | |
---|
| 918 | return incidentangle; |
---|
| 919 | } |
---|
| 920 | |
---|
| 921 | G4double G4OpBoundaryProcess::GetReflectivity(G4double E1_perp, |
---|
| 922 | G4double E1_parl, |
---|
| 923 | G4double incidentangle, |
---|
| 924 | G4double RealRindex, |
---|
| 925 | G4double ImaginaryRindex) |
---|
| 926 | { |
---|
| 927 | |
---|
| 928 | G4complex Reflectivity, Reflectivity_TE, Reflectivity_TM; |
---|
| 929 | G4complex N(RealRindex, ImaginaryRindex); |
---|
| 930 | G4complex CosPhi; |
---|
| 931 | |
---|
| 932 | G4complex u(1,0); //unit number 1 |
---|
| 933 | |
---|
| 934 | G4complex numeratorTE; // E1_perp=1 E1_parl=0 -> TE polarization |
---|
| 935 | G4complex numeratorTM; // E1_parl=1 E1_perp=0 -> TM polarization |
---|
| 936 | G4complex denominatorTE, denominatorTM; |
---|
| 937 | G4complex rTM, rTE; |
---|
| 938 | |
---|
| 939 | // Following two equations, rTM and rTE, are from: "Introduction To Modern |
---|
| 940 | // Optics" written by Fowles |
---|
| 941 | |
---|
| 942 | CosPhi=std::sqrt(u-((std::sin(incidentangle)*std::sin(incidentangle))/(N*N))); |
---|
| 943 | |
---|
| 944 | numeratorTE = std::cos(incidentangle) - N*CosPhi; |
---|
| 945 | denominatorTE = std::cos(incidentangle) + N*CosPhi; |
---|
| 946 | rTE = numeratorTE/denominatorTE; |
---|
| 947 | |
---|
| 948 | numeratorTM = N*std::cos(incidentangle) - CosPhi; |
---|
| 949 | denominatorTM = N*std::cos(incidentangle) + CosPhi; |
---|
| 950 | rTM = numeratorTM/denominatorTM; |
---|
| 951 | |
---|
| 952 | // This is my calculaton for reflectivity on a metalic surface |
---|
| 953 | // depending on the fraction of TE and TM polarization |
---|
| 954 | // when TE polarization, E1_parl=0 and E1_perp=1, R=abs(rTE)^2 and |
---|
| 955 | // when TM polarization, E1_parl=1 and E1_perp=0, R=abs(rTM)^2 |
---|
| 956 | |
---|
| 957 | Reflectivity_TE = (rTE*conj(rTE))*(E1_perp*E1_perp) |
---|
| 958 | / (E1_perp*E1_perp + E1_parl*E1_parl); |
---|
| 959 | Reflectivity_TM = (rTM*conj(rTM))*(E1_parl*E1_parl) |
---|
| 960 | / (E1_perp*E1_perp + E1_parl*E1_parl); |
---|
| 961 | Reflectivity = Reflectivity_TE + Reflectivity_TM; |
---|
| 962 | |
---|
| 963 | do { |
---|
| 964 | if(G4UniformRand()*real(Reflectivity) > real(Reflectivity_TE))iTE = -1; |
---|
| 965 | if(G4UniformRand()*real(Reflectivity) > real(Reflectivity_TM))iTM = -1; |
---|
| 966 | } while(iTE<0&&iTM<0); |
---|
| 967 | |
---|
| 968 | return real(Reflectivity); |
---|
| 969 | |
---|
| 970 | } |
---|