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 | // $Id: G4OpBoundaryProcess.hh,v 1.16 2007/10/15 21:16:24 gum Exp $ |
---|
28 | // GEANT4 tag $Name: $ |
---|
29 | // |
---|
30 | // |
---|
31 | //////////////////////////////////////////////////////////////////////// |
---|
32 | // Optical Photon Boundary Process Class Definition |
---|
33 | //////////////////////////////////////////////////////////////////////// |
---|
34 | // |
---|
35 | // File: G4OpBoundaryProcess.hh |
---|
36 | // Description: Discrete Process -- reflection/refraction at |
---|
37 | // optical interfaces |
---|
38 | // Version: 1.1 |
---|
39 | // Created: 1997-06-18 |
---|
40 | // Modified: 2005-07-28 add G4ProcessType to constructor |
---|
41 | // 1999-10-29 add method and class descriptors |
---|
42 | // 1999-10-10 - Fill NewMomentum/NewPolarization in |
---|
43 | // DoAbsorption. These members need to be |
---|
44 | // filled since DoIt calls |
---|
45 | // aParticleChange.SetMomentumChange etc. |
---|
46 | // upon return (thanks to: Clark McGrew) |
---|
47 | // 2006-11-04 - add capability of calculating the reflectivity |
---|
48 | // off a metal surface by way of a complex index |
---|
49 | // of refraction - Thanks to Sehwook Lee and John |
---|
50 | // Hauptman (Dept. of Physics - Iowa State Univ.) |
---|
51 | // |
---|
52 | // Author: Peter Gumplinger |
---|
53 | // adopted from work by Werner Keil - April 2/96 |
---|
54 | // mail: gum@triumf.ca |
---|
55 | // |
---|
56 | // CVS version tag: |
---|
57 | //////////////////////////////////////////////////////////////////////// |
---|
58 | |
---|
59 | #ifndef G4OpBoundaryProcess_h |
---|
60 | #define G4OpBoundaryProcess_h 1 |
---|
61 | |
---|
62 | ///////////// |
---|
63 | // Includes |
---|
64 | ///////////// |
---|
65 | |
---|
66 | #include "globals.hh" |
---|
67 | #include "templates.hh" |
---|
68 | #include "geomdefs.hh" |
---|
69 | #include "Randomize.hh" |
---|
70 | #include "G4Step.hh" |
---|
71 | #include "G4VDiscreteProcess.hh" |
---|
72 | #include "G4DynamicParticle.hh" |
---|
73 | #include "G4Material.hh" |
---|
74 | #include "G4LogicalBorderSurface.hh" |
---|
75 | #include "G4LogicalSkinSurface.hh" |
---|
76 | #include "G4OpticalSurface.hh" |
---|
77 | #include "G4OpticalPhoton.hh" |
---|
78 | #include "G4TransportationManager.hh" |
---|
79 | |
---|
80 | // Class Description: |
---|
81 | // Discrete Process -- reflection/refraction at optical interfaces. |
---|
82 | // Class inherits publicly from G4VDiscreteProcess. |
---|
83 | // Class Description - End: |
---|
84 | |
---|
85 | ///////////////////// |
---|
86 | // Class Definition |
---|
87 | ///////////////////// |
---|
88 | |
---|
89 | enum G4OpBoundaryProcessStatus { Undefined, |
---|
90 | FresnelRefraction, FresnelReflection, |
---|
91 | TotalInternalReflection, |
---|
92 | LambertianReflection, LobeReflection, |
---|
93 | SpikeReflection, BackScattering, |
---|
94 | Absorption, Detection, NotAtBoundary, |
---|
95 | SameMaterial, StepTooSmall, NoRINDEX }; |
---|
96 | |
---|
97 | class G4OpBoundaryProcess : public G4VDiscreteProcess |
---|
98 | { |
---|
99 | |
---|
100 | private: |
---|
101 | |
---|
102 | ////////////// |
---|
103 | // Operators |
---|
104 | ////////////// |
---|
105 | |
---|
106 | // G4OpBoundaryProcess& operator=(const G4OpBoundaryProcess &right); |
---|
107 | |
---|
108 | // G4OpBoundaryProcess(const G4OpBoundaryProcess &right); |
---|
109 | |
---|
110 | public: // Without description |
---|
111 | |
---|
112 | //////////////////////////////// |
---|
113 | // Constructors and Destructor |
---|
114 | //////////////////////////////// |
---|
115 | |
---|
116 | G4OpBoundaryProcess(const G4String& processName = "OpBoundary", |
---|
117 | G4ProcessType type = fOptical); |
---|
118 | |
---|
119 | ~G4OpBoundaryProcess(); |
---|
120 | |
---|
121 | //////////// |
---|
122 | // Methods |
---|
123 | //////////// |
---|
124 | |
---|
125 | public: // With description |
---|
126 | |
---|
127 | G4bool IsApplicable(const G4ParticleDefinition& aParticleType); |
---|
128 | // Returns true -> 'is applicable' only for an optical photon. |
---|
129 | |
---|
130 | G4double GetMeanFreePath(const G4Track& , |
---|
131 | G4double , |
---|
132 | G4ForceCondition* condition); |
---|
133 | // Returns infinity; i. e. the process does not limit the step, |
---|
134 | // but sets the 'Forced' condition for the DoIt to be invoked at |
---|
135 | // every step. However, only at a boundary will any action be |
---|
136 | // taken. |
---|
137 | |
---|
138 | G4VParticleChange* PostStepDoIt(const G4Track& aTrack, |
---|
139 | const G4Step& aStep); |
---|
140 | // This is the method implementing boundary processes. |
---|
141 | |
---|
142 | G4OpticalSurfaceModel GetModel() const; |
---|
143 | // Returns the optical surface mode. |
---|
144 | |
---|
145 | G4OpBoundaryProcessStatus GetStatus() const; |
---|
146 | // Returns the current status. |
---|
147 | |
---|
148 | G4double GetIncidentAngle(); |
---|
149 | // Returns the incident angle of optical photon |
---|
150 | |
---|
151 | G4double GetReflectivity(G4double E1_perp, |
---|
152 | G4double E1_parl, |
---|
153 | G4double incidentangle, |
---|
154 | G4double RealRindex, |
---|
155 | G4double ImaginaryRindex); |
---|
156 | // Returns the Reflectivity on a metalic surface |
---|
157 | |
---|
158 | void SetModel(G4OpticalSurfaceModel model); |
---|
159 | // Set the optical surface model to be followed |
---|
160 | // (glisur || unified). |
---|
161 | |
---|
162 | private: |
---|
163 | |
---|
164 | void G4Swap(G4double* a, G4double* b) const; |
---|
165 | |
---|
166 | void G4Swap(G4Material* a, G4Material* b) const; |
---|
167 | |
---|
168 | void G4VectorSwap(G4ThreeVector* vec1, G4ThreeVector* vec2) const; |
---|
169 | |
---|
170 | G4bool G4BooleanRand(const G4double prob) const; |
---|
171 | |
---|
172 | G4ThreeVector G4IsotropicRand() const; |
---|
173 | |
---|
174 | G4ThreeVector G4LambertianRand(const G4ThreeVector& normal); |
---|
175 | |
---|
176 | G4ThreeVector G4PlaneVectorRand(const G4ThreeVector& normal) const; |
---|
177 | |
---|
178 | G4ThreeVector GetFacetNormal(const G4ThreeVector& Momentum, |
---|
179 | const G4ThreeVector& Normal) const; |
---|
180 | |
---|
181 | void DielectricMetal(); |
---|
182 | void DielectricDielectric(); |
---|
183 | |
---|
184 | void ChooseReflection(); |
---|
185 | void DoAbsorption(); |
---|
186 | void DoReflection(); |
---|
187 | |
---|
188 | private: |
---|
189 | |
---|
190 | G4double thePhotonMomentum; |
---|
191 | |
---|
192 | G4ThreeVector OldMomentum; |
---|
193 | G4ThreeVector OldPolarization; |
---|
194 | |
---|
195 | G4ThreeVector NewMomentum; |
---|
196 | G4ThreeVector NewPolarization; |
---|
197 | |
---|
198 | G4ThreeVector theGlobalNormal; |
---|
199 | G4ThreeVector theFacetNormal; |
---|
200 | |
---|
201 | G4Material* Material1; |
---|
202 | G4Material* Material2; |
---|
203 | |
---|
204 | G4OpticalSurface* OpticalSurface; |
---|
205 | |
---|
206 | G4double Rindex1; |
---|
207 | G4double Rindex2; |
---|
208 | |
---|
209 | G4double cost1, cost2, sint1, sint2; |
---|
210 | |
---|
211 | G4OpBoundaryProcessStatus theStatus; |
---|
212 | |
---|
213 | G4OpticalSurfaceModel theModel; |
---|
214 | |
---|
215 | G4OpticalSurfaceFinish theFinish; |
---|
216 | |
---|
217 | G4double theReflectivity; |
---|
218 | G4double theEfficiency; |
---|
219 | G4double prob_sl, prob_ss, prob_bs; |
---|
220 | |
---|
221 | G4int iTE, iTM; |
---|
222 | |
---|
223 | G4double kCarTolerance; |
---|
224 | }; |
---|
225 | |
---|
226 | //////////////////// |
---|
227 | // Inline methods |
---|
228 | //////////////////// |
---|
229 | |
---|
230 | inline |
---|
231 | void G4OpBoundaryProcess::G4Swap(G4double* a, G4double* b) const |
---|
232 | { |
---|
233 | // swaps the contents of the objects pointed |
---|
234 | // to by 'a' and 'b'! |
---|
235 | |
---|
236 | G4double temp; |
---|
237 | |
---|
238 | temp = *a; |
---|
239 | *a = *b; |
---|
240 | *b = temp; |
---|
241 | } |
---|
242 | |
---|
243 | inline |
---|
244 | void G4OpBoundaryProcess::G4Swap(G4Material* a, G4Material* b) const |
---|
245 | { |
---|
246 | // ONLY swaps the pointers; i.e. what used to be pointed |
---|
247 | // to by 'a' is now pointed to by 'b' and vice versa! |
---|
248 | |
---|
249 | G4Material* temp = a; |
---|
250 | |
---|
251 | a = b; |
---|
252 | b = temp; |
---|
253 | } |
---|
254 | |
---|
255 | inline |
---|
256 | void G4OpBoundaryProcess::G4VectorSwap(G4ThreeVector* vec1, |
---|
257 | G4ThreeVector* vec2) const |
---|
258 | { |
---|
259 | // swaps the contents of the objects pointed |
---|
260 | // to by 'vec1' and 'vec2'! |
---|
261 | |
---|
262 | G4ThreeVector temp; |
---|
263 | |
---|
264 | temp = *vec1; |
---|
265 | *vec1 = *vec2; |
---|
266 | *vec2 = temp; |
---|
267 | } |
---|
268 | |
---|
269 | inline |
---|
270 | G4bool G4OpBoundaryProcess::G4BooleanRand(const G4double prob) const |
---|
271 | { |
---|
272 | /* Returns a random boolean variable with the specified probability */ |
---|
273 | |
---|
274 | return (G4UniformRand() < prob); |
---|
275 | } |
---|
276 | |
---|
277 | inline |
---|
278 | G4ThreeVector G4OpBoundaryProcess::G4IsotropicRand() const |
---|
279 | { |
---|
280 | /* Returns a random isotropic unit vector. */ |
---|
281 | |
---|
282 | G4ThreeVector vect; |
---|
283 | G4double len2; |
---|
284 | |
---|
285 | do { |
---|
286 | |
---|
287 | vect.setX(G4UniformRand() - 0.5); |
---|
288 | vect.setY(G4UniformRand() - 0.5); |
---|
289 | vect.setZ(G4UniformRand() - 0.5); |
---|
290 | |
---|
291 | len2 = vect.mag2(); |
---|
292 | |
---|
293 | } while (len2 < 0.01 || len2 > 0.25); |
---|
294 | |
---|
295 | return vect.unit(); |
---|
296 | } |
---|
297 | |
---|
298 | inline |
---|
299 | G4ThreeVector G4OpBoundaryProcess:: |
---|
300 | G4LambertianRand(const G4ThreeVector& normal) |
---|
301 | { |
---|
302 | /* Returns a random lambertian unit vector. */ |
---|
303 | |
---|
304 | G4ThreeVector vect; |
---|
305 | G4double ndotv; |
---|
306 | |
---|
307 | do { |
---|
308 | vect = G4IsotropicRand(); |
---|
309 | |
---|
310 | ndotv = normal * vect; |
---|
311 | |
---|
312 | if (ndotv < 0.0) { |
---|
313 | vect = -vect; |
---|
314 | ndotv = -ndotv; |
---|
315 | } |
---|
316 | |
---|
317 | } while (!G4BooleanRand(ndotv)); |
---|
318 | return vect; |
---|
319 | } |
---|
320 | |
---|
321 | inline |
---|
322 | G4ThreeVector G4OpBoundaryProcess:: |
---|
323 | G4PlaneVectorRand(const G4ThreeVector& normal) const |
---|
324 | |
---|
325 | /* This function chooses a random vector within a plane given |
---|
326 | by the unit normal */ |
---|
327 | { |
---|
328 | G4ThreeVector vec1 = normal.orthogonal(); |
---|
329 | |
---|
330 | G4ThreeVector vec2 = vec1.cross(normal); |
---|
331 | |
---|
332 | G4double phi = twopi*G4UniformRand(); |
---|
333 | G4double cosphi = std::cos(phi); |
---|
334 | G4double sinphi = std::sin(phi); |
---|
335 | |
---|
336 | return cosphi * vec1 + sinphi * vec2; |
---|
337 | } |
---|
338 | |
---|
339 | inline |
---|
340 | G4bool G4OpBoundaryProcess::IsApplicable(const G4ParticleDefinition& |
---|
341 | aParticleType) |
---|
342 | { |
---|
343 | return ( &aParticleType == G4OpticalPhoton::OpticalPhoton() ); |
---|
344 | } |
---|
345 | |
---|
346 | inline |
---|
347 | G4OpticalSurfaceModel G4OpBoundaryProcess::GetModel() const |
---|
348 | { |
---|
349 | return theModel; |
---|
350 | } |
---|
351 | |
---|
352 | inline |
---|
353 | G4OpBoundaryProcessStatus G4OpBoundaryProcess::GetStatus() const |
---|
354 | { |
---|
355 | return theStatus; |
---|
356 | } |
---|
357 | |
---|
358 | inline |
---|
359 | void G4OpBoundaryProcess::SetModel(G4OpticalSurfaceModel model) |
---|
360 | { |
---|
361 | theModel = model; |
---|
362 | } |
---|
363 | |
---|
364 | inline |
---|
365 | void G4OpBoundaryProcess::ChooseReflection() |
---|
366 | { |
---|
367 | G4double rand = G4UniformRand(); |
---|
368 | if ( rand >= 0.0 && rand < prob_ss ) { |
---|
369 | theStatus = SpikeReflection; |
---|
370 | theFacetNormal = theGlobalNormal; |
---|
371 | } |
---|
372 | else if ( rand >= prob_ss && |
---|
373 | rand <= prob_ss+prob_sl) { |
---|
374 | theStatus = LobeReflection; |
---|
375 | } |
---|
376 | else if ( rand > prob_ss+prob_sl && |
---|
377 | rand < prob_ss+prob_sl+prob_bs ) { |
---|
378 | theStatus = BackScattering; |
---|
379 | } |
---|
380 | else { |
---|
381 | theStatus = LambertianReflection; |
---|
382 | } |
---|
383 | } |
---|
384 | |
---|
385 | inline |
---|
386 | void G4OpBoundaryProcess::DoAbsorption() |
---|
387 | { |
---|
388 | theStatus = Absorption; |
---|
389 | |
---|
390 | if ( G4BooleanRand(theEfficiency) ) { |
---|
391 | |
---|
392 | // EnergyDeposited =/= 0 means: photon has been detected |
---|
393 | theStatus = Detection; |
---|
394 | aParticleChange.ProposeLocalEnergyDeposit(thePhotonMomentum); |
---|
395 | } |
---|
396 | else { |
---|
397 | aParticleChange.ProposeLocalEnergyDeposit(0.0); |
---|
398 | } |
---|
399 | |
---|
400 | NewMomentum = OldMomentum; |
---|
401 | NewPolarization = OldPolarization; |
---|
402 | |
---|
403 | // aParticleChange.ProposeEnergy(0.0); |
---|
404 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
405 | } |
---|
406 | |
---|
407 | inline |
---|
408 | void G4OpBoundaryProcess::DoReflection() |
---|
409 | { |
---|
410 | if ( theStatus == LambertianReflection ) { |
---|
411 | |
---|
412 | NewMomentum = G4LambertianRand(theGlobalNormal); |
---|
413 | theFacetNormal = (NewMomentum - OldMomentum).unit(); |
---|
414 | |
---|
415 | } |
---|
416 | else if ( theFinish == ground ) { |
---|
417 | |
---|
418 | theStatus = LobeReflection; |
---|
419 | theFacetNormal = GetFacetNormal(OldMomentum,theGlobalNormal); |
---|
420 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
421 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
422 | |
---|
423 | } |
---|
424 | else { |
---|
425 | |
---|
426 | theStatus = SpikeReflection; |
---|
427 | theFacetNormal = theGlobalNormal; |
---|
428 | G4double PdotN = OldMomentum * theFacetNormal; |
---|
429 | NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal; |
---|
430 | |
---|
431 | } |
---|
432 | G4double EdotN = OldPolarization * theFacetNormal; |
---|
433 | NewPolarization = -OldPolarization + (2.*EdotN)*theFacetNormal; |
---|
434 | } |
---|
435 | |
---|
436 | #endif /* G4OpBoundaryProcess_h */ |
---|