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26 // 26 //
>> 27 // $Id: G4LowEnergyPolarizedCompton.cc,v 1.25 2008/05/02 19:23:38 pia Exp $
>> 28 // GEANT4 tag $Name: $
27 // 29 //
28 // ------------------------------------------- 30 // ------------------------------------------------------------
29 // GEANT 4 class implementation file 31 // GEANT 4 class implementation file
30 // CERN Geneva Switzerland 32 // CERN Geneva Switzerland
31 // 33 //
32 34
33 // --------- G4LowEnergyPolarizedCompton class 35 // --------- G4LowEnergyPolarizedCompton class -----
34 // 36 //
35 // by G.Depaola & F.Longo (21 may 20 37 // by G.Depaola & F.Longo (21 may 2001)
36 // 38 //
37 // 21 May 2001 - MGP Modified to inherit 39 // 21 May 2001 - MGP Modified to inherit from G4VDiscreteProcess
38 // Applies same algorit 40 // Applies same algorithm as LowEnergyCompton
39 // if the incoming phot 41 // if the incoming photon is not polarised
40 // Temporary protection 42 // Temporary protection to avoid crash in the case
41 // of polarisation || i 43 // of polarisation || incident photon direction
42 // 44 //
43 // 17 October 2001 - F.Longo - Revised accordi 45 // 17 October 2001 - F.Longo - Revised according to a design iteration
44 // 46 //
45 // 21 February 2002 - F.Longo Revisions with A 47 // 21 February 2002 - F.Longo Revisions with A.Zoglauer and G.Depaola
46 // - better descrip 48 // - better description of parallelism
47 // - system of ref 49 // - system of ref change method improved
48 // 22 January 2003 - V.Ivanchenko Cut per reg 50 // 22 January 2003 - V.Ivanchenko Cut per region
49 // 24 April 2003 - V.Ivanchenko Cut per reg 51 // 24 April 2003 - V.Ivanchenko Cut per region mfpt
50 // 52 //
51 // 53 //
52 // ******************************************* 54 // ************************************************************
53 // 55 //
54 // Corrections by Rui Curado da Silva (2000) 56 // Corrections by Rui Curado da Silva (2000)
55 // New Implementation by G.Depaola & F.Longo 57 // New Implementation by G.Depaola & F.Longo
56 // 58 //
57 // - sampling of phi 59 // - sampling of phi
58 // - polarization of scattered photon 60 // - polarization of scattered photon
59 // 61 //
60 // ------------------------------------------- 62 // --------------------------------------------------------------
61 63
62 #include "G4LowEnergyPolarizedCompton.hh" 64 #include "G4LowEnergyPolarizedCompton.hh"
63 #include "Randomize.hh" 65 #include "Randomize.hh"
64 #include "G4PhysicalConstants.hh" <<
65 #include "G4SystemOfUnits.hh" <<
66 #include "G4ParticleDefinition.hh" 66 #include "G4ParticleDefinition.hh"
67 #include "G4Track.hh" 67 #include "G4Track.hh"
68 #include "G4Step.hh" 68 #include "G4Step.hh"
69 #include "G4ForceCondition.hh" 69 #include "G4ForceCondition.hh"
70 #include "G4Gamma.hh" 70 #include "G4Gamma.hh"
71 #include "G4Electron.hh" 71 #include "G4Electron.hh"
72 #include "G4DynamicParticle.hh" 72 #include "G4DynamicParticle.hh"
73 #include "G4VParticleChange.hh" 73 #include "G4VParticleChange.hh"
74 #include "G4ThreeVector.hh" 74 #include "G4ThreeVector.hh"
75 #include "G4RDVCrossSectionHandler.hh" 75 #include "G4RDVCrossSectionHandler.hh"
76 #include "G4RDCrossSectionHandler.hh" 76 #include "G4RDCrossSectionHandler.hh"
77 #include "G4RDVEMDataSet.hh" 77 #include "G4RDVEMDataSet.hh"
78 #include "G4RDCompositeEMDataSet.hh" 78 #include "G4RDCompositeEMDataSet.hh"
79 #include "G4RDVDataSetAlgorithm.hh" 79 #include "G4RDVDataSetAlgorithm.hh"
80 #include "G4RDLogLogInterpolation.hh" 80 #include "G4RDLogLogInterpolation.hh"
81 #include "G4RDVRangeTest.hh" 81 #include "G4RDVRangeTest.hh"
82 #include "G4RDRangeTest.hh" 82 #include "G4RDRangeTest.hh"
83 #include "G4MaterialCutsCouple.hh" 83 #include "G4MaterialCutsCouple.hh"
84 84
85 // constructor 85 // constructor
86 86
87 G4LowEnergyPolarizedCompton::G4LowEnergyPolari 87 G4LowEnergyPolarizedCompton::G4LowEnergyPolarizedCompton(const G4String& processName)
88 : G4VDiscreteProcess(processName), 88 : G4VDiscreteProcess(processName),
89 lowEnergyLimit (250*eV), // i 89 lowEnergyLimit (250*eV), // initialization
90 highEnergyLimit(100*GeV), 90 highEnergyLimit(100*GeV),
91 intrinsicLowEnergyLimit(10*eV), 91 intrinsicLowEnergyLimit(10*eV),
92 intrinsicHighEnergyLimit(100*GeV) 92 intrinsicHighEnergyLimit(100*GeV)
93 { 93 {
94 if (lowEnergyLimit < intrinsicLowEnergyLimit 94 if (lowEnergyLimit < intrinsicLowEnergyLimit ||
95 highEnergyLimit > intrinsicHighEnergyLim 95 highEnergyLimit > intrinsicHighEnergyLimit)
96 { 96 {
97 G4Exception("G4LowEnergyPolarizedCompton 97 G4Exception("G4LowEnergyPolarizedCompton::G4LowEnergyPolarizedCompton()",
98 "OutOfRange", FatalException 98 "OutOfRange", FatalException,
99 "Energy outside intrinsic pr 99 "Energy outside intrinsic process validity range!");
100 } 100 }
101 101
102 crossSectionHandler = new G4RDCrossSectionHa 102 crossSectionHandler = new G4RDCrossSectionHandler;
103 103
104 104
105 G4RDVDataSetAlgorithm* scatterInterpolation 105 G4RDVDataSetAlgorithm* scatterInterpolation = new G4RDLogLogInterpolation;
106 G4String scatterFile = "comp/ce-sf-"; 106 G4String scatterFile = "comp/ce-sf-";
107 scatterFunctionData = new G4RDCompositeEMDat 107 scatterFunctionData = new G4RDCompositeEMDataSet(scatterInterpolation,1.,1.);
108 scatterFunctionData->LoadData(scatterFile); 108 scatterFunctionData->LoadData(scatterFile);
109 109
110 meanFreePathTable = 0; 110 meanFreePathTable = 0;
111 111
112 rangeTest = new G4RDRangeTest; 112 rangeTest = new G4RDRangeTest;
113 113
114 // For Doppler broadening 114 // For Doppler broadening
115 shellData.SetOccupancyData(); 115 shellData.SetOccupancyData();
116 116
117 117
118 if (verboseLevel > 0) 118 if (verboseLevel > 0)
119 { 119 {
120 G4cout << GetProcessName() << " is crea 120 G4cout << GetProcessName() << " is created " << G4endl
121 << "Energy range: " 121 << "Energy range: "
122 << lowEnergyLimit / keV << " keV - " 122 << lowEnergyLimit / keV << " keV - "
123 << highEnergyLimit / GeV << " GeV" 123 << highEnergyLimit / GeV << " GeV"
124 << G4endl; 124 << G4endl;
125 } 125 }
126 } 126 }
127 127
128 // destructor 128 // destructor
129 129
130 G4LowEnergyPolarizedCompton::~G4LowEnergyPolar 130 G4LowEnergyPolarizedCompton::~G4LowEnergyPolarizedCompton()
131 { 131 {
132 delete meanFreePathTable; 132 delete meanFreePathTable;
133 delete crossSectionHandler; 133 delete crossSectionHandler;
134 delete scatterFunctionData; 134 delete scatterFunctionData;
135 delete rangeTest; 135 delete rangeTest;
136 } 136 }
137 137
138 138
139 void G4LowEnergyPolarizedCompton::BuildPhysics 139 void G4LowEnergyPolarizedCompton::BuildPhysicsTable(const G4ParticleDefinition& )
140 { 140 {
141 141
142 crossSectionHandler->Clear(); 142 crossSectionHandler->Clear();
143 G4String crossSectionFile = "comp/ce-cs-"; 143 G4String crossSectionFile = "comp/ce-cs-";
144 crossSectionHandler->LoadData(crossSectionFi 144 crossSectionHandler->LoadData(crossSectionFile);
145 delete meanFreePathTable; 145 delete meanFreePathTable;
146 meanFreePathTable = crossSectionHandler->Bui 146 meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials();
147 147
148 // For Doppler broadening 148 // For Doppler broadening
149 G4String file = "/doppler/shell-doppler"; 149 G4String file = "/doppler/shell-doppler";
150 shellData.LoadData(file); 150 shellData.LoadData(file);
151 151
152 } 152 }
153 153
154 G4VParticleChange* G4LowEnergyPolarizedCompton 154 G4VParticleChange* G4LowEnergyPolarizedCompton::PostStepDoIt(const G4Track& aTrack,
155 const G4Step& aStep) 155 const G4Step& aStep)
156 { 156 {
157 // The scattered gamma energy is sampled acc 157 // The scattered gamma energy is sampled according to Klein - Nishina formula.
158 // The random number techniques of Butcher & 158 // The random number techniques of Butcher & Messel are used (Nuc Phys 20(1960),15).
159 // GEANT4 internal units 159 // GEANT4 internal units
160 // 160 //
161 // Note : Effects due to binding of atomic e 161 // Note : Effects due to binding of atomic electrons are negliged.
162 162
163 aParticleChange.Initialize(aTrack); 163 aParticleChange.Initialize(aTrack);
164 164
165 // Dynamic particle quantities 165 // Dynamic particle quantities
166 const G4DynamicParticle* incidentPhoton = aT 166 const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle();
167 G4double gammaEnergy0 = incidentPhoton->GetK 167 G4double gammaEnergy0 = incidentPhoton->GetKineticEnergy();
168 G4ThreeVector gammaPolarization0 = incidentP 168 G4ThreeVector gammaPolarization0 = incidentPhoton->GetPolarization();
169 169
170 // gammaPolarization0 = gammaPolarization0. 170 // gammaPolarization0 = gammaPolarization0.unit(); //
171 171
172 // Protection: a polarisation parallel to th 172 // Protection: a polarisation parallel to the
173 // direction causes problems; 173 // direction causes problems;
174 // in that case find a random polarization 174 // in that case find a random polarization
175 175
176 G4ThreeVector gammaDirection0 = incidentPhot 176 G4ThreeVector gammaDirection0 = incidentPhoton->GetMomentumDirection();
177 // ---- MGP ---- Next two lines commented ou 177 // ---- MGP ---- Next two lines commented out to remove compilation warnings
178 // G4double scalarproduct = gammaPolarizatio 178 // G4double scalarproduct = gammaPolarization0.dot(gammaDirection0);
179 // G4double angle = gammaPolarization0.angle 179 // G4double angle = gammaPolarization0.angle(gammaDirection0);
180 180
181 // Make sure that the polarization vector is 181 // Make sure that the polarization vector is perpendicular to the
182 // gamma direction. If not 182 // gamma direction. If not
183 183
184 if(!(gammaPolarization0.isOrthogonal(gammaDi 184 if(!(gammaPolarization0.isOrthogonal(gammaDirection0, 1e-6))||(gammaPolarization0.mag()==0))
185 { // only for testing now 185 { // only for testing now
186 gammaPolarization0 = GetRandomPolarizati 186 gammaPolarization0 = GetRandomPolarization(gammaDirection0);
187 } 187 }
188 else 188 else
189 { 189 {
190 if ( gammaPolarization0.howOrthogonal(ga 190 if ( gammaPolarization0.howOrthogonal(gammaDirection0) != 0)
191 { 191 {
192 gammaPolarization0 = GetPerpendicularPolar 192 gammaPolarization0 = GetPerpendicularPolarization(gammaDirection0, gammaPolarization0);
193 } 193 }
194 } 194 }
195 195
196 // End of Protection 196 // End of Protection
197 197
198 // Within energy limit? 198 // Within energy limit?
199 199
200 if(gammaEnergy0 <= lowEnergyLimit) 200 if(gammaEnergy0 <= lowEnergyLimit)
201 { 201 {
202 aParticleChange.ProposeTrackStatus(fStop 202 aParticleChange.ProposeTrackStatus(fStopAndKill);
203 aParticleChange.ProposeEnergy(0.); 203 aParticleChange.ProposeEnergy(0.);
204 aParticleChange.ProposeLocalEnergyDeposi 204 aParticleChange.ProposeLocalEnergyDeposit(gammaEnergy0);
205 return G4VDiscreteProcess::PostStepDoIt( 205 return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep);
206 } 206 }
207 207
208 G4double E0_m = gammaEnergy0 / electron_mass 208 G4double E0_m = gammaEnergy0 / electron_mass_c2 ;
209 209
210 // Select randomly one element in the curren 210 // Select randomly one element in the current material
211 211
212 const G4MaterialCutsCouple* couple = aTrack. 212 const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple();
213 G4int Z = crossSectionHandler->SelectRandomA 213 G4int Z = crossSectionHandler->SelectRandomAtom(couple,gammaEnergy0);
214 214
215 // Sample the energy and the polarization of 215 // Sample the energy and the polarization of the scattered photon
216 216
217 G4double epsilon, epsilonSq, onecost, sinThe 217 G4double epsilon, epsilonSq, onecost, sinThetaSqr, greject ;
218 218
219 G4double epsilon0 = 1./(1. + 2*E0_m); 219 G4double epsilon0 = 1./(1. + 2*E0_m);
220 G4double epsilon0Sq = epsilon0*epsilon0; 220 G4double epsilon0Sq = epsilon0*epsilon0;
221 G4double alpha1 = - std::log(epsilon0); 221 G4double alpha1 = - std::log(epsilon0);
222 G4double alpha2 = 0.5*(1.- epsilon0Sq); 222 G4double alpha2 = 0.5*(1.- epsilon0Sq);
223 223
224 G4double wlGamma = h_Planck*c_light/gammaEne 224 G4double wlGamma = h_Planck*c_light/gammaEnergy0;
225 G4double gammaEnergy1; 225 G4double gammaEnergy1;
226 G4ThreeVector gammaDirection1; 226 G4ThreeVector gammaDirection1;
227 227
228 do { 228 do {
229 if ( alpha1/(alpha1+alpha2) > G4UniformRan 229 if ( alpha1/(alpha1+alpha2) > G4UniformRand() )
230 { 230 {
231 epsilon = std::exp(-alpha1*G4UniformRand() 231 epsilon = std::exp(-alpha1*G4UniformRand());
232 epsilonSq = epsilon*epsilon; 232 epsilonSq = epsilon*epsilon;
233 } 233 }
234 else 234 else
235 { 235 {
236 epsilonSq = epsilon0Sq + (1.- epsilon0Sq)*G4 236 epsilonSq = epsilon0Sq + (1.- epsilon0Sq)*G4UniformRand();
237 epsilon = std::sqrt(epsilonSq); 237 epsilon = std::sqrt(epsilonSq);
238 } 238 }
239 239
240 onecost = (1.- epsilon)/(epsilon*E0_m); 240 onecost = (1.- epsilon)/(epsilon*E0_m);
241 sinThetaSqr = onecost*(2.-onecost); 241 sinThetaSqr = onecost*(2.-onecost);
242 242
243 // Protection 243 // Protection
244 if (sinThetaSqr > 1.) 244 if (sinThetaSqr > 1.)
245 { 245 {
246 if (verboseLevel>0) G4cout 246 if (verboseLevel>0) G4cout
247 << " -- Warning -- G4LowEnergyPolarizedCom 247 << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
248 << "sin(theta)**2 = " 248 << "sin(theta)**2 = "
249 << sinThetaSqr 249 << sinThetaSqr
250 << "; set to 1" 250 << "; set to 1"
251 << G4endl; 251 << G4endl;
252 sinThetaSqr = 1.; 252 sinThetaSqr = 1.;
253 } 253 }
254 if (sinThetaSqr < 0.) 254 if (sinThetaSqr < 0.)
255 { 255 {
256 if (verboseLevel>0) G4cout 256 if (verboseLevel>0) G4cout
257 << " -- Warning -- G4LowEnergyPolarizedCom 257 << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
258 << "sin(theta)**2 = " 258 << "sin(theta)**2 = "
259 << sinThetaSqr 259 << sinThetaSqr
260 << "; set to 0" 260 << "; set to 0"
261 << G4endl; 261 << G4endl;
262 sinThetaSqr = 0.; 262 sinThetaSqr = 0.;
263 } 263 }
264 // End protection 264 // End protection
265 265
266 G4double x = std::sqrt(onecost/2.) / (wlG 266 G4double x = std::sqrt(onecost/2.) / (wlGamma/cm);;
267 G4double scatteringFunction = scatterFunct 267 G4double scatteringFunction = scatterFunctionData->FindValue(x,Z-1);
268 greject = (1. - epsilon*sinThetaSqr/(1.+ e 268 greject = (1. - epsilon*sinThetaSqr/(1.+ epsilonSq))*scatteringFunction;
269 269
270 } while(greject < G4UniformRand()*Z); 270 } while(greject < G4UniformRand()*Z);
271 271
272 272
273 // ***************************************** 273 // ****************************************************
274 // Phi determination 274 // Phi determination
275 // ***************************************** 275 // ****************************************************
276 276
277 G4double phi = SetPhi(epsilon,sinThetaSqr); 277 G4double phi = SetPhi(epsilon,sinThetaSqr);
278 278
279 // 279 //
280 // scattered gamma angles. ( Z - axis along 280 // scattered gamma angles. ( Z - axis along the parent gamma)
281 // 281 //
282 282
283 G4double cosTheta = 1. - onecost; 283 G4double cosTheta = 1. - onecost;
284 284
285 // Protection 285 // Protection
286 286
287 if (cosTheta > 1.) 287 if (cosTheta > 1.)
288 { 288 {
289 if (verboseLevel>0) G4cout 289 if (verboseLevel>0) G4cout
290 << " -- Warning -- G4LowEnergyPolarizedCompt 290 << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
291 << "cosTheta = " 291 << "cosTheta = "
292 << cosTheta 292 << cosTheta
293 << "; set to 1" 293 << "; set to 1"
294 << G4endl; 294 << G4endl;
295 cosTheta = 1.; 295 cosTheta = 1.;
296 } 296 }
297 if (cosTheta < -1.) 297 if (cosTheta < -1.)
298 { 298 {
299 if (verboseLevel>0) G4cout 299 if (verboseLevel>0) G4cout
300 << " -- Warning -- G4LowEnergyPolarizedCompt 300 << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
301 << "cosTheta = " 301 << "cosTheta = "
302 << cosTheta 302 << cosTheta
303 << "; set to -1" 303 << "; set to -1"
304 << G4endl; 304 << G4endl;
305 cosTheta = -1.; 305 cosTheta = -1.;
306 } 306 }
307 // End protection 307 // End protection
308 308
309 309
310 G4double sinTheta = std::sqrt (sinThetaSqr); 310 G4double sinTheta = std::sqrt (sinThetaSqr);
311 311
312 // Protection 312 // Protection
313 if (sinTheta > 1.) 313 if (sinTheta > 1.)
314 { 314 {
315 if (verboseLevel>0) G4cout 315 if (verboseLevel>0) G4cout
316 << " -- Warning -- G4LowEnergyPolarizedCompt 316 << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
317 << "sinTheta = " 317 << "sinTheta = "
318 << sinTheta 318 << sinTheta
319 << "; set to 1" 319 << "; set to 1"
320 << G4endl; 320 << G4endl;
321 sinTheta = 1.; 321 sinTheta = 1.;
322 } 322 }
323 if (sinTheta < -1.) 323 if (sinTheta < -1.)
324 { 324 {
325 if (verboseLevel>0) G4cout 325 if (verboseLevel>0) G4cout
326 << " -- Warning -- G4LowEnergyPolarizedCompt 326 << " -- Warning -- G4LowEnergyPolarizedCompton::PostStepDoIt "
327 << "sinTheta = " 327 << "sinTheta = "
328 << sinTheta 328 << sinTheta
329 << "; set to -1" 329 << "; set to -1"
330 << G4endl; 330 << G4endl;
331 sinTheta = -1.; 331 sinTheta = -1.;
332 } 332 }
333 // End protection 333 // End protection
334 334
335 335
336 G4double dirx = sinTheta*std::cos(phi); 336 G4double dirx = sinTheta*std::cos(phi);
337 G4double diry = sinTheta*std::sin(phi); 337 G4double diry = sinTheta*std::sin(phi);
338 G4double dirz = cosTheta ; 338 G4double dirz = cosTheta ;
339 339
340 340
341 // oneCosT , eom 341 // oneCosT , eom
342 342
343 343
344 344
345 // Doppler broadening - Method based on: 345 // Doppler broadening - Method based on:
346 // Y. Namito, S. Ban and H. Hirayama, 346 // Y. Namito, S. Ban and H. Hirayama,
347 // "Implementation of the Doppler Broadening 347 // "Implementation of the Doppler Broadening of a Compton-Scattered Photon Into the EGS4 Code"
348 // NIM A 349, pp. 489-494, 1994 348 // NIM A 349, pp. 489-494, 1994
349 349
350 // Maximum number of sampling iterations 350 // Maximum number of sampling iterations
351 351
352 G4int maxDopplerIterations = 1000; 352 G4int maxDopplerIterations = 1000;
353 G4double bindingE = 0.; 353 G4double bindingE = 0.;
354 G4double photonEoriginal = epsilon * gammaEn 354 G4double photonEoriginal = epsilon * gammaEnergy0;
355 G4double photonE = -1.; 355 G4double photonE = -1.;
356 G4int iteration = 0; 356 G4int iteration = 0;
357 G4double eMax = gammaEnergy0; 357 G4double eMax = gammaEnergy0;
358 358
359 do 359 do
360 { 360 {
361 iteration++; 361 iteration++;
362 // Select shell based on shell occupancy 362 // Select shell based on shell occupancy
363 G4int shell = shellData.SelectRandomShel 363 G4int shell = shellData.SelectRandomShell(Z);
364 bindingE = shellData.BindingEnergy(Z,she 364 bindingE = shellData.BindingEnergy(Z,shell);
365 365
366 eMax = gammaEnergy0 - bindingE; 366 eMax = gammaEnergy0 - bindingE;
367 367
368 // Randomly sample bound electron moment 368 // Randomly sample bound electron momentum (memento: the data set is in Atomic Units)
369 G4double pSample = profileData.RandomSel 369 G4double pSample = profileData.RandomSelectMomentum(Z,shell);
370 // Rescale from atomic units 370 // Rescale from atomic units
371 G4double pDoppler = pSample * fine_struc 371 G4double pDoppler = pSample * fine_structure_const;
372 G4double pDoppler2 = pDoppler * pDoppler 372 G4double pDoppler2 = pDoppler * pDoppler;
373 G4double var2 = 1. + onecost * E0_m; 373 G4double var2 = 1. + onecost * E0_m;
374 G4double var3 = var2*var2 - pDoppler2; 374 G4double var3 = var2*var2 - pDoppler2;
375 G4double var4 = var2 - pDoppler2 * cosTh 375 G4double var4 = var2 - pDoppler2 * cosTheta;
376 G4double var = var4*var4 - var3 + pDoppl 376 G4double var = var4*var4 - var3 + pDoppler2 * var3;
377 if (var > 0.) 377 if (var > 0.)
378 { 378 {
379 G4double varSqrt = std::sqrt(var); 379 G4double varSqrt = std::sqrt(var);
380 G4double scale = gammaEnergy0 / var3; 380 G4double scale = gammaEnergy0 / var3;
381 // Random select either root 381 // Random select either root
382 if (G4UniformRand() < 0.5) photonE = (var4 382 if (G4UniformRand() < 0.5) photonE = (var4 - varSqrt) * scale;
383 else photonE = (var4 + varSqrt) * scale; 383 else photonE = (var4 + varSqrt) * scale;
384 } 384 }
385 else 385 else
386 { 386 {
387 photonE = -1.; 387 photonE = -1.;
388 } 388 }
389 } while ( iteration <= maxDopplerIterations 389 } while ( iteration <= maxDopplerIterations &&
390 (photonE < 0. || photonE > eMax || phot 390 (photonE < 0. || photonE > eMax || photonE < eMax*G4UniformRand()) );
391 391
392 // End of recalculation of photon energy wit 392 // End of recalculation of photon energy with Doppler broadening
393 // Revert to original if maximum number of i 393 // Revert to original if maximum number of iterations threshold has been reached
394 if (iteration >= maxDopplerIterations) 394 if (iteration >= maxDopplerIterations)
395 { 395 {
396 photonE = photonEoriginal; 396 photonE = photonEoriginal;
397 bindingE = 0.; 397 bindingE = 0.;
398 } 398 }
399 399
400 gammaEnergy1 = photonE; 400 gammaEnergy1 = photonE;
401 401
402 // G4cout << "--> PHOTONENERGY1 = " << photo 402 // G4cout << "--> PHOTONENERGY1 = " << photonE/keV << G4endl;
403 403
404 404
405 /// Doppler Broadeing 405 /// Doppler Broadeing
406 406
407 407
408 408
409 409
410 // 410 //
411 // update G4VParticleChange for the scattere 411 // update G4VParticleChange for the scattered photon
412 // 412 //
413 413
414 // gammaEnergy1 = epsilon*gammaEnergy0; 414 // gammaEnergy1 = epsilon*gammaEnergy0;
415 415
416 416
417 // New polarization 417 // New polarization
418 418
419 G4ThreeVector gammaPolarization1 = SetNewPol 419 G4ThreeVector gammaPolarization1 = SetNewPolarization(epsilon,
420 sinThetaSqr, 420 sinThetaSqr,
421 phi, 421 phi,
422 cosTheta); 422 cosTheta);
423 423
424 // Set new direction 424 // Set new direction
425 G4ThreeVector tmpDirection1( dirx,diry,dirz 425 G4ThreeVector tmpDirection1( dirx,diry,dirz );
426 gammaDirection1 = tmpDirection1; 426 gammaDirection1 = tmpDirection1;
427 427
428 // Change reference frame. 428 // Change reference frame.
429 429
430 SystemOfRefChange(gammaDirection0,gammaDirec 430 SystemOfRefChange(gammaDirection0,gammaDirection1,
431 gammaPolarization0,gammaPolarization1) 431 gammaPolarization0,gammaPolarization1);
432 432
433 if (gammaEnergy1 > 0.) 433 if (gammaEnergy1 > 0.)
434 { 434 {
435 aParticleChange.ProposeEnergy( gammaEner 435 aParticleChange.ProposeEnergy( gammaEnergy1 ) ;
436 aParticleChange.ProposeMomentumDirection 436 aParticleChange.ProposeMomentumDirection( gammaDirection1 );
437 aParticleChange.ProposePolarization( gam 437 aParticleChange.ProposePolarization( gammaPolarization1 );
438 } 438 }
439 else 439 else
440 { 440 {
441 aParticleChange.ProposeEnergy(0.) ; 441 aParticleChange.ProposeEnergy(0.) ;
442 aParticleChange.ProposeTrackStatus(fStop 442 aParticleChange.ProposeTrackStatus(fStopAndKill);
443 } 443 }
444 444
445 // 445 //
446 // kinematic of the scattered electron 446 // kinematic of the scattered electron
447 // 447 //
448 448
449 G4double ElecKineEnergy = gammaEnergy0 - gam 449 G4double ElecKineEnergy = gammaEnergy0 - gammaEnergy1 -bindingE;
450 450
451 451
452 // Generate the electron only if with large 452 // Generate the electron only if with large enough range w.r.t. cuts and safety
453 453
454 G4double safety = aStep.GetPostStepPoint()-> 454 G4double safety = aStep.GetPostStepPoint()->GetSafety();
455 455
456 456
457 if (rangeTest->Escape(G4Electron::Electron() 457 if (rangeTest->Escape(G4Electron::Electron(),couple,ElecKineEnergy,safety))
458 { 458 {
459 G4double ElecMomentum = std::sqrt(ElecKi 459 G4double ElecMomentum = std::sqrt(ElecKineEnergy*(ElecKineEnergy+2.*electron_mass_c2));
460 G4ThreeVector ElecDirection((gammaEnergy 460 G4ThreeVector ElecDirection((gammaEnergy0 * gammaDirection0 -
461 gammaEnergy1 * gammaDirection1) * ( 461 gammaEnergy1 * gammaDirection1) * (1./ElecMomentum));
462 G4DynamicParticle* electron = new G4Dyna 462 G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(),ElecDirection.unit(),ElecKineEnergy) ;
463 aParticleChange.SetNumberOfSecondaries(1 463 aParticleChange.SetNumberOfSecondaries(1);
464 aParticleChange.AddSecondary(electron); 464 aParticleChange.AddSecondary(electron);
465 // aParticleChange.ProposeLocalEner 465 // aParticleChange.ProposeLocalEnergyDeposit(0.);
466 aParticleChange.ProposeLocalEnergyDeposi 466 aParticleChange.ProposeLocalEnergyDeposit(bindingE);
467 } 467 }
468 else 468 else
469 { 469 {
470 aParticleChange.SetNumberOfSecondaries(0 470 aParticleChange.SetNumberOfSecondaries(0);
471 aParticleChange.ProposeLocalEnergyDeposi 471 aParticleChange.ProposeLocalEnergyDeposit(ElecKineEnergy+bindingE);
472 } 472 }
473 473
474 return G4VDiscreteProcess::PostStepDoIt( aTr 474 return G4VDiscreteProcess::PostStepDoIt( aTrack, aStep);
475 475
476 } 476 }
477 477
478 478
479 G4double G4LowEnergyPolarizedCompton::SetPhi(G 479 G4double G4LowEnergyPolarizedCompton::SetPhi(G4double energyRate,
480 G4double sinSqrTh) 480 G4double sinSqrTh)
481 { 481 {
482 G4double rand1; 482 G4double rand1;
483 G4double rand2; 483 G4double rand2;
484 G4double phiProbability; 484 G4double phiProbability;
485 G4double phi; 485 G4double phi;
486 G4double a, b; 486 G4double a, b;
487 487
488 do 488 do
489 { 489 {
490 rand1 = G4UniformRand(); 490 rand1 = G4UniformRand();
491 rand2 = G4UniformRand(); 491 rand2 = G4UniformRand();
492 phiProbability=0.; 492 phiProbability=0.;
493 phi = twopi*rand1; 493 phi = twopi*rand1;
494 494
495 a = 2*sinSqrTh; 495 a = 2*sinSqrTh;
496 b = energyRate + 1/energyRate; 496 b = energyRate + 1/energyRate;
497 497
498 phiProbability = 1 - (a/b)*(std::cos(phi 498 phiProbability = 1 - (a/b)*(std::cos(phi)*std::cos(phi));
499 499
500 500
501 501
502 } 502 }
503 while ( rand2 > phiProbability ); 503 while ( rand2 > phiProbability );
504 return phi; 504 return phi;
505 } 505 }
506 506
507 507
508 G4ThreeVector G4LowEnergyPolarizedCompton::Set 508 G4ThreeVector G4LowEnergyPolarizedCompton::SetPerpendicularVector(G4ThreeVector& a)
509 { 509 {
510 G4double dx = a.x(); 510 G4double dx = a.x();
511 G4double dy = a.y(); 511 G4double dy = a.y();
512 G4double dz = a.z(); 512 G4double dz = a.z();
513 G4double x = dx < 0.0 ? -dx : dx; 513 G4double x = dx < 0.0 ? -dx : dx;
514 G4double y = dy < 0.0 ? -dy : dy; 514 G4double y = dy < 0.0 ? -dy : dy;
515 G4double z = dz < 0.0 ? -dz : dz; 515 G4double z = dz < 0.0 ? -dz : dz;
516 if (x < y) { 516 if (x < y) {
517 return x < z ? G4ThreeVector(-dy,dx,0) : G 517 return x < z ? G4ThreeVector(-dy,dx,0) : G4ThreeVector(0,-dz,dy);
518 }else{ 518 }else{
519 return y < z ? G4ThreeVector(dz,0,-dx) : G 519 return y < z ? G4ThreeVector(dz,0,-dx) : G4ThreeVector(-dy,dx,0);
520 } 520 }
521 } 521 }
522 522
523 G4ThreeVector G4LowEnergyPolarizedCompton::Get 523 G4ThreeVector G4LowEnergyPolarizedCompton::GetRandomPolarization(G4ThreeVector& direction0)
524 { 524 {
525 G4ThreeVector d0 = direction0.unit(); 525 G4ThreeVector d0 = direction0.unit();
526 G4ThreeVector a1 = SetPerpendicularVector(d0 526 G4ThreeVector a1 = SetPerpendicularVector(d0); //different orthogonal
527 G4ThreeVector a0 = a1.unit(); // unit vector 527 G4ThreeVector a0 = a1.unit(); // unit vector
528 528
529 G4double rand1 = G4UniformRand(); 529 G4double rand1 = G4UniformRand();
530 530
531 G4double angle = twopi*rand1; // random pola 531 G4double angle = twopi*rand1; // random polar angle
532 G4ThreeVector b0 = d0.cross(a0); // cross pr 532 G4ThreeVector b0 = d0.cross(a0); // cross product
533 533
534 G4ThreeVector c; 534 G4ThreeVector c;
535 535
536 c.setX(std::cos(angle)*(a0.x())+std::sin(ang 536 c.setX(std::cos(angle)*(a0.x())+std::sin(angle)*b0.x());
537 c.setY(std::cos(angle)*(a0.y())+std::sin(ang 537 c.setY(std::cos(angle)*(a0.y())+std::sin(angle)*b0.y());
538 c.setZ(std::cos(angle)*(a0.z())+std::sin(ang 538 c.setZ(std::cos(angle)*(a0.z())+std::sin(angle)*b0.z());
539 539
540 G4ThreeVector c0 = c.unit(); 540 G4ThreeVector c0 = c.unit();
541 541
542 return c0; 542 return c0;
543 543
544 } 544 }
545 545
546 546
547 G4ThreeVector G4LowEnergyPolarizedCompton::Get 547 G4ThreeVector G4LowEnergyPolarizedCompton::GetPerpendicularPolarization
548 (const G4ThreeVector& gammaDirection, const G4 548 (const G4ThreeVector& gammaDirection, const G4ThreeVector& gammaPolarization) const
549 { 549 {
550 550
551 // 551 //
552 // The polarization of a photon is always pe 552 // The polarization of a photon is always perpendicular to its momentum direction.
553 // Therefore this function removes those vec 553 // Therefore this function removes those vector component of gammaPolarization, which
554 // points in direction of gammaDirection 554 // points in direction of gammaDirection
555 // 555 //
556 // Mathematically we search the projection o 556 // Mathematically we search the projection of the vector a on the plane E, where n is the
557 // plains normal vector. 557 // plains normal vector.
558 // The basic equation can be found in each g 558 // The basic equation can be found in each geometry book (e.g. Bronstein):
559 // p = a - (a o n)/(n o n)*n 559 // p = a - (a o n)/(n o n)*n
560 560
561 return gammaPolarization - gammaPolarization 561 return gammaPolarization - gammaPolarization.dot(gammaDirection)/gammaDirection.dot(gammaDirection) * gammaDirection;
562 } 562 }
563 563
564 564
565 G4ThreeVector G4LowEnergyPolarizedCompton::Set 565 G4ThreeVector G4LowEnergyPolarizedCompton::SetNewPolarization(G4double epsilon,
566 G4double sinSqrTh, 566 G4double sinSqrTh,
567 G4double phi, 567 G4double phi,
568 G4double costheta) 568 G4double costheta)
569 { 569 {
570 G4double rand1; 570 G4double rand1;
571 G4double rand2; 571 G4double rand2;
572 G4double cosPhi = std::cos(phi); 572 G4double cosPhi = std::cos(phi);
573 G4double sinPhi = std::sin(phi); 573 G4double sinPhi = std::sin(phi);
574 G4double sinTheta = std::sqrt(sinSqrTh); 574 G4double sinTheta = std::sqrt(sinSqrTh);
575 G4double cosSqrPhi = cosPhi*cosPhi; 575 G4double cosSqrPhi = cosPhi*cosPhi;
576 // G4double cossqrth = 1.-sinSqrTh; 576 // G4double cossqrth = 1.-sinSqrTh;
577 // G4double sinsqrphi = sinPhi*sinPhi; 577 // G4double sinsqrphi = sinPhi*sinPhi;
578 G4double normalisation = std::sqrt(1. - cosS 578 G4double normalisation = std::sqrt(1. - cosSqrPhi*sinSqrTh);
579 579
580 580
581 // Determination of Theta 581 // Determination of Theta
582 582
583 // ---- MGP ---- Commented out the following 583 // ---- MGP ---- Commented out the following 3 lines to avoid compilation
584 // warnings (unused variables) 584 // warnings (unused variables)
585 // G4double thetaProbability; 585 // G4double thetaProbability;
586 G4double theta; 586 G4double theta;
587 // G4double a, b; 587 // G4double a, b;
588 // G4double cosTheta; 588 // G4double cosTheta;
589 589
590 /* 590 /*
591 591
592 depaola method 592 depaola method
593 593
594 do 594 do
595 { 595 {
596 rand1 = G4UniformRand(); 596 rand1 = G4UniformRand();
597 rand2 = G4UniformRand(); 597 rand2 = G4UniformRand();
598 thetaProbability=0.; 598 thetaProbability=0.;
599 theta = twopi*rand1; 599 theta = twopi*rand1;
600 a = 4*normalisation*normalisation; 600 a = 4*normalisation*normalisation;
601 b = (epsilon + 1/epsilon) - 2; 601 b = (epsilon + 1/epsilon) - 2;
602 thetaProbability = (b + a*std::cos(theta 602 thetaProbability = (b + a*std::cos(theta)*std::cos(theta))/(a+b);
603 cosTheta = std::cos(theta); 603 cosTheta = std::cos(theta);
604 } 604 }
605 while ( rand2 > thetaProbability ); 605 while ( rand2 > thetaProbability );
606 606
607 G4double cosBeta = cosTheta; 607 G4double cosBeta = cosTheta;
608 608
609 */ 609 */
610 610
611 611
612 // Dan Xu method (IEEE TNS, 52, 1160 (2005)) 612 // Dan Xu method (IEEE TNS, 52, 1160 (2005))
613 613
614 rand1 = G4UniformRand(); 614 rand1 = G4UniformRand();
615 rand2 = G4UniformRand(); 615 rand2 = G4UniformRand();
616 616
617 if (rand1<(epsilon+1.0/epsilon-2)/(2.0*(epsi 617 if (rand1<(epsilon+1.0/epsilon-2)/(2.0*(epsilon+1.0/epsilon)-4.0*sinSqrTh*cosSqrPhi))
618 { 618 {
619 if (rand2<0.5) 619 if (rand2<0.5)
620 theta = pi/2.0; 620 theta = pi/2.0;
621 else 621 else
622 theta = 3.0*pi/2.0; 622 theta = 3.0*pi/2.0;
623 } 623 }
624 else 624 else
625 { 625 {
626 if (rand2<0.5) 626 if (rand2<0.5)
627 theta = 0; 627 theta = 0;
628 else 628 else
629 theta = pi; 629 theta = pi;
630 } 630 }
631 G4double cosBeta = std::cos(theta); 631 G4double cosBeta = std::cos(theta);
632 G4double sinBeta = std::sqrt(1-cosBeta*cosBe 632 G4double sinBeta = std::sqrt(1-cosBeta*cosBeta);
633 633
634 G4ThreeVector gammaPolarization1; 634 G4ThreeVector gammaPolarization1;
635 635
636 G4double xParallel = normalisation*cosBeta; 636 G4double xParallel = normalisation*cosBeta;
637 G4double yParallel = -(sinSqrTh*cosPhi*sinPh 637 G4double yParallel = -(sinSqrTh*cosPhi*sinPhi)*cosBeta/normalisation;
638 G4double zParallel = -(costheta*sinTheta*cos 638 G4double zParallel = -(costheta*sinTheta*cosPhi)*cosBeta/normalisation;
639 G4double xPerpendicular = 0.; 639 G4double xPerpendicular = 0.;
640 G4double yPerpendicular = (costheta)*sinBeta 640 G4double yPerpendicular = (costheta)*sinBeta/normalisation;
641 G4double zPerpendicular = -(sinTheta*sinPhi) 641 G4double zPerpendicular = -(sinTheta*sinPhi)*sinBeta/normalisation;
642 642
643 G4double xTotal = (xParallel + xPerpendicula 643 G4double xTotal = (xParallel + xPerpendicular);
644 G4double yTotal = (yParallel + yPerpendicula 644 G4double yTotal = (yParallel + yPerpendicular);
645 G4double zTotal = (zParallel + zPerpendicula 645 G4double zTotal = (zParallel + zPerpendicular);
646 646
647 gammaPolarization1.setX(xTotal); 647 gammaPolarization1.setX(xTotal);
648 gammaPolarization1.setY(yTotal); 648 gammaPolarization1.setY(yTotal);
649 gammaPolarization1.setZ(zTotal); 649 gammaPolarization1.setZ(zTotal);
650 650
651 return gammaPolarization1; 651 return gammaPolarization1;
652 652
653 } 653 }
654 654
655 655
656 void G4LowEnergyPolarizedCompton::SystemOfRefC 656 void G4LowEnergyPolarizedCompton::SystemOfRefChange(G4ThreeVector& direction0,
657 G4ThreeVector& direction1, 657 G4ThreeVector& direction1,
658 G4ThreeVector& polarization0, 658 G4ThreeVector& polarization0,
659 G4ThreeVector& polarization1) 659 G4ThreeVector& polarization1)
660 { 660 {
661 // direction0 is the original photon directi 661 // direction0 is the original photon direction ---> z
662 // polarization0 is the original photon pola 662 // polarization0 is the original photon polarization ---> x
663 // need to specify y axis in the real refere 663 // need to specify y axis in the real reference frame ---> y
664 G4ThreeVector Axis_Z0 = direction0.unit(); 664 G4ThreeVector Axis_Z0 = direction0.unit();
665 G4ThreeVector Axis_X0 = polarization0.unit() 665 G4ThreeVector Axis_X0 = polarization0.unit();
666 G4ThreeVector Axis_Y0 = (Axis_Z0.cross(Axis_ 666 G4ThreeVector Axis_Y0 = (Axis_Z0.cross(Axis_X0)).unit(); // to be confirmed;
667 667
668 G4double direction_x = direction1.getX(); 668 G4double direction_x = direction1.getX();
669 G4double direction_y = direction1.getY(); 669 G4double direction_y = direction1.getY();
670 G4double direction_z = direction1.getZ(); 670 G4double direction_z = direction1.getZ();
671 671
672 direction1 = (direction_x*Axis_X0 + directio 672 direction1 = (direction_x*Axis_X0 + direction_y*Axis_Y0 + direction_z*Axis_Z0).unit();
673 G4double polarization_x = polarization1.getX 673 G4double polarization_x = polarization1.getX();
674 G4double polarization_y = polarization1.getY 674 G4double polarization_y = polarization1.getY();
675 G4double polarization_z = polarization1.getZ 675 G4double polarization_z = polarization1.getZ();
676 676
677 polarization1 = (polarization_x*Axis_X0 + po 677 polarization1 = (polarization_x*Axis_X0 + polarization_y*Axis_Y0 + polarization_z*Axis_Z0).unit();
678 678
679 } 679 }
680 680
681 681
682 G4bool G4LowEnergyPolarizedCompton::IsApplicab 682 G4bool G4LowEnergyPolarizedCompton::IsApplicable(const G4ParticleDefinition& particle)
683 { 683 {
684 return ( &particle == G4Gamma::Gamma() ); 684 return ( &particle == G4Gamma::Gamma() );
685 } 685 }
686 686
687 687
688 G4double G4LowEnergyPolarizedCompton::GetMeanF 688 G4double G4LowEnergyPolarizedCompton::GetMeanFreePath(const G4Track& track,
689 G4double, 689 G4double,
690 G4ForceCondition*) 690 G4ForceCondition*)
691 { 691 {
692 const G4DynamicParticle* photon = track.GetD 692 const G4DynamicParticle* photon = track.GetDynamicParticle();
693 G4double energy = photon->GetKineticEnergy() 693 G4double energy = photon->GetKineticEnergy();
694 const G4MaterialCutsCouple* couple = track.G 694 const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple();
695 size_t materialIndex = couple->GetIndex(); 695 size_t materialIndex = couple->GetIndex();
696 G4double meanFreePath; 696 G4double meanFreePath;
697 if (energy > highEnergyLimit) meanFreePath = 697 if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex);
698 else if (energy < lowEnergyLimit) meanFreePa 698 else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX;
699 else meanFreePath = meanFreePathTable->FindV 699 else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex);
700 return meanFreePath; 700 return meanFreePath;
701 } 701 }
702 702
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