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25 // 25 //
>> 26 // $Id: G4PenelopeGammaConversionModel.cc,v 1.6 2009/06/11 15:47:08 mantero Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03-patch-01 $
26 // 28 //
27 // Author: Luciano Pandola 29 // Author: Luciano Pandola
28 // 30 //
29 // History: 31 // History:
30 // -------- 32 // --------
31 // 13 Jan 2010 L Pandola First implementa << 33 // 06 Oct 2008 L Pandola Migration from process to model
32 // 24 May 2011 L Pandola Renamed (make v2 << 34 // 17 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries:
33 // 18 Sep 2013 L Pandola Migration to MT << 35 // - apply internal high-energy limit only in constructor
34 // data and create << 36 // - do not apply low-energy limit (default is 0)
>> 37 // - do not apply production threshold on level of the model
>> 38 // 19 May 2009 L Pandola Explicitely set to zero pointers deleted in
>> 39 // Initialise(), since they might be checked later on
35 // 40 //
36 41
37 #include "G4PenelopeGammaConversionModel.hh" 42 #include "G4PenelopeGammaConversionModel.hh"
38 #include "G4PhysicalConstants.hh" <<
39 #include "G4SystemOfUnits.hh" <<
40 #include "G4ParticleDefinition.hh" 43 #include "G4ParticleDefinition.hh"
41 #include "G4MaterialCutsCouple.hh" 44 #include "G4MaterialCutsCouple.hh"
42 #include "G4ProductionCutsTable.hh" 45 #include "G4ProductionCutsTable.hh"
43 #include "G4DynamicParticle.hh" 46 #include "G4DynamicParticle.hh"
44 #include "G4Element.hh" 47 #include "G4Element.hh"
45 #include "G4Gamma.hh" 48 #include "G4Gamma.hh"
46 #include "G4Electron.hh" 49 #include "G4Electron.hh"
47 #include "G4Positron.hh" 50 #include "G4Positron.hh"
48 #include "G4PhysicsFreeVector.hh" << 51 #include "G4CrossSectionHandler.hh"
49 #include "G4MaterialCutsCouple.hh" <<
50 #include "G4AutoLock.hh" <<
51 #include "G4Exp.hh" <<
52 52
53 //....oooOO0OOooo........oooOO0OOooo........oo 53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
54 const G4int G4PenelopeGammaConversionModel::fM <<
55 G4PhysicsFreeVector* G4PenelopeGammaConversion <<
56 G4double G4PenelopeGammaConversionModel::fAtom <<
57 1.2281e+02,7.3167e+01,6.9 <<
58 6.4696e+01,6.1228e+01,5.7 <<
59 5.0787e+01,4.7851e+01,4.6 <<
60 4.4503e+01,4.3815e+01,4.3 <<
61 4.1586e+01,4.0953e+01,4.0 <<
62 3.9756e+01,3.9144e+01,3.8 <<
63 3.7174e+01,3.6663e+01,3.5 <<
64 3.4688e+01,3.4197e+01,3.3 <<
65 3.3068e+01,3.2740e+01,3.2 <<
66 3.1884e+01,3.1622e+01,3.1 <<
67 3.0950e+01,3.0758e+01,3.0 <<
68 3.0097e+01,2.9832e+01,2.9 <<
69 2.9247e+01,2.9085e+01,2.8 <<
70 2.8580e+01,2.8442e+01,2.8 <<
71 2.7973e+01,2.7819e+01,2.7 <<
72 2.7285e+01,2.7093e+01,2.6 <<
73 2.6516e+01,2.6304e+01,2.6 <<
74 2.5730e+01,2.5577e+01,2.5 <<
75 2.5100e+01,2.4941e+01,2.4 <<
76 2.4506e+01,2.4391e+01,2.4 <<
77 2.4039e+01,2.3922e+01,2.3 <<
78 2.3621e+01,2.3523e+01,2.3 <<
79 2.3238e+01,2.3139e+01,2.3 <<
80 2.2833e+01,2.2694e+01,2.2 <<
81 2.2446e+01,2.2358e+01,2.2 <<
82 54
83 //....oooOO0OOooo........oooOO0OOooo........oo <<
84 55
85 G4PenelopeGammaConversionModel::G4PenelopeGamm << 56 G4PenelopeGammaConversionModel::G4PenelopeGammaConversionModel(const G4ParticleDefinition*,
86 const G4String& nam) << 57 const G4String& nam)
87 :G4VEmModel(nam),fParticleChange(nullptr),fP << 58 :G4VEmModel(nam),fTheScreeningRadii(0),crossSectionHandler(0),isInitialised(false)
88 fEffectiveCharge(nullptr),fMaterialInvScree <<
89 fScreeningFunction(nullptr),fIsInitialised( <<
90 { 59 {
91 fIntrinsicLowEnergyLimit = 2.0*electron_mass 60 fIntrinsicLowEnergyLimit = 2.0*electron_mass_c2;
92 fIntrinsicHighEnergyLimit = 100.0*GeV; 61 fIntrinsicHighEnergyLimit = 100.0*GeV;
93 fSmallEnergy = 1.1*MeV; 62 fSmallEnergy = 1.1*MeV;
94 63
95 if (part) <<
96 SetParticle(part); <<
97 <<
98 // SetLowEnergyLimit(fIntrinsicLowEnergyLim 64 // SetLowEnergyLimit(fIntrinsicLowEnergyLimit);
99 SetHighEnergyLimit(fIntrinsicHighEnergyLimit 65 SetHighEnergyLimit(fIntrinsicHighEnergyLimit);
100 // 66 //
101 fVerboseLevel= 0; << 67 verboseLevel= 0;
102 // Verbosity scale: 68 // Verbosity scale:
103 // 0 = nothing << 69 // 0 = nothing
104 // 1 = warning for energy non-conservation << 70 // 1 = warning for energy non-conservation
105 // 2 = details of energy budget 71 // 2 = details of energy budget
106 // 3 = calculation of cross sections, file o 72 // 3 = calculation of cross sections, file openings, sampling of atoms
107 // 4 = entering in methods 73 // 4 = entering in methods
108 } 74 }
109 75
110 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
111 77
112 G4PenelopeGammaConversionModel::~G4PenelopeGam 78 G4PenelopeGammaConversionModel::~G4PenelopeGammaConversionModel()
113 { << 79 {
114 //Delete shared tables, they exist only in t << 80 if (crossSectionHandler) delete crossSectionHandler;
115 if (IsMaster() || fLocalTable) << 81 if (fTheScreeningRadii) delete fTheScreeningRadii;
116 { <<
117 for(G4int i=0; i<=fMaxZ; ++i) <<
118 { <<
119 if(fLogAtomicCrossSection[i]) { <<
120 delete fLogAtomicCrossSection[i]; <<
121 fLogAtomicCrossSection[i] = nullptr; <<
122 } <<
123 } <<
124 if (fEffectiveCharge) <<
125 delete fEffectiveCharge; <<
126 if (fMaterialInvScreeningRadius) <<
127 delete fMaterialInvScreeningRadius; <<
128 if (fScreeningFunction) <<
129 delete fScreeningFunction; <<
130 } <<
131 } 82 }
132 83
133 //....oooOO0OOooo........oooOO0OOooo........oo 84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
134 85
135 void G4PenelopeGammaConversionModel::Initialis << 86 void G4PenelopeGammaConversionModel::Initialise(const G4ParticleDefinition*,
136 const G4DataVector&) << 87 const G4DataVector& )
137 { 88 {
138 if (fVerboseLevel > 3) << 89 if (verboseLevel > 3)
139 G4cout << "Calling G4PenelopeGammaConvers 90 G4cout << "Calling G4PenelopeGammaConversionModel::Initialise()" << G4endl;
140 91
141 SetParticle(part); << 92 //Delete the old cross section handler, if necessary
142 << 93 if (crossSectionHandler)
143 //Only the master model creates/fills/destro <<
144 if (IsMaster() && part == fParticle) <<
145 { 94 {
146 //delete old material data... << 95 crossSectionHandler->Clear();
147 if (fEffectiveCharge) << 96 delete crossSectionHandler;
148 { << 97 crossSectionHandler = 0;
149 delete fEffectiveCharge; << 98 }
150 fEffectiveCharge = nullptr; << 99
151 } << 100 //Re-initialize cross section handler
152 if (fMaterialInvScreeningRadius) << 101 crossSectionHandler = new G4CrossSectionHandler();
153 { << 102 crossSectionHandler->Initialise(0,fIntrinsicLowEnergyLimit,HighEnergyLimit(),400);
154 delete fMaterialInvScreeningRadius; << 103 crossSectionHandler->Clear();
155 fMaterialInvScreeningRadius = nullptr; << 104 G4String crossSectionFile = "penelope/pp-cs-pen-";
156 } << 105 crossSectionHandler->LoadData(crossSectionFile);
157 if (fScreeningFunction) << 106 //This is used to retrieve cross section values later on
158 { << 107 crossSectionHandler->BuildMeanFreePathForMaterials();
159 delete fScreeningFunction; << 108
160 fScreeningFunction = nullptr; << 109 if (verboseLevel > 2)
161 } << 110 G4cout << "Loaded cross section files for PenelopeGammaConversion" << G4endl;
162 //and create new ones << 111
163 fEffectiveCharge = new std::map<const G4 << 112 if (verboseLevel > 0) {
164 fMaterialInvScreeningRadius = new std::m << 113 G4cout << "Penelope Gamma Conversion model is initialized " << G4endl
165 fScreeningFunction = new std::map<const << 114 << "Energy range: "
166 << 115 << LowEnergyLimit() / MeV << " MeV - "
167 G4ProductionCutsTable* theCoupleTable = << 116 << HighEnergyLimit() / GeV << " GeV"
168 G4ProductionCutsTable::GetProductionCutsTabl << 117 << G4endl;
169 << 118 }
170 for (G4int i=0;i<(G4int)theCoupleTable-> <<
171 { <<
172 const G4Material* material = <<
173 theCoupleTable->GetMaterialCutsCouple(i) <<
174 const G4ElementVector* theElementVector = <<
175 <<
176 for (std::size_t j=0;j<material->GetNumber <<
177 { <<
178 G4int iZ = theElementVector->at(j)->Ge <<
179 //read data files only in the master <<
180 if (iZ <= fMaxZ && !fLogAtomicCrossSe <<
181 ReadDataFile(iZ); <<
182 } <<
183 119
184 //check if material data are available << 120 if(isInitialised) return;
185 if (!fEffectiveCharge->count(material)) <<
186 InitializeScreeningFunctions(material); <<
187 } <<
188 if (fVerboseLevel > 0) { <<
189 G4cout << "Penelope Gamma Conversion model v <<
190 << "Energy range: " <<
191 << LowEnergyLimit() / MeV << " MeV - <<
192 << HighEnergyLimit() / GeV << " GeV" <<
193 << G4endl; <<
194 } <<
195 } <<
196 if(fIsInitialised) return; <<
197 fParticleChange = GetParticleChangeForGamma( 121 fParticleChange = GetParticleChangeForGamma();
198 fIsInitialised = true; << 122 isInitialised = true;
199 } 123 }
200 124
201 //....oooOO0OOooo........oooOO0OOooo........oo 125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
202 126
203 void G4PenelopeGammaConversionModel::Initialis <<
204 G4VEmModel *masterModel) <<
205 { <<
206 if (fVerboseLevel > 3) <<
207 G4cout << "Calling G4PenelopeGammaConvers <<
208 // <<
209 //Check that particle matches: one might hav <<
210 //for e+ and e-). <<
211 // <<
212 if (part == fParticle) <<
213 { <<
214 //Get the const table pointers from the <<
215 const G4PenelopeGammaConversionModel* th <<
216 static_cast<G4PenelopeGammaConversionModel*> <<
217 <<
218 //Copy pointers to the data tables <<
219 fEffectiveCharge = theModel->fEffectiveC <<
220 fMaterialInvScreeningRadius = theModel-> <<
221 fScreeningFunction = theModel->fScreenin <<
222 for(G4int i=0; i<=fMaxZ; ++i) <<
223 fLogAtomicCrossSection[i] = theModel->fLogAt <<
224 <<
225 //Same verbosity for all workers, as the <<
226 fVerboseLevel = theModel->fVerboseLevel; <<
227 } <<
228 <<
229 return; <<
230 } <<
231 <<
232 //....oooOO0OOooo........oooOO0OOooo........oo <<
233 namespace { G4Mutex PenelopeGammaConversionMo <<
234 <<
235 G4double G4PenelopeGammaConversionModel::Compu 127 G4double G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom(
236 const G4ParticleDefinition << 128 const G4ParticleDefinition*,
237 G4double energy, << 129 G4double energy,
238 G4double Z, G4double, << 130 G4double Z, G4double,
239 G4double, G4double) << 131 G4double, G4double)
240 { 132 {
241 // 133 //
242 // Penelope model v2008. << 134 // Penelope model.
243 // Cross section (including triplet producti << 135 // Cross section (including triplet production) read from database and managed
244 // through the G4CrossSectionHandler utility 136 // through the G4CrossSectionHandler utility. Cross section data are from
245 // M.J. Berger and J.H. Hubbel (XCOM), Repor 137 // M.J. Berger and J.H. Hubbel (XCOM), Report NBSIR 887-3598
246 // 138 //
>> 139
>> 140 if (verboseLevel > 3)
>> 141 G4cout << "Calling ComputeCrossSectionPerAtom() of G4PenelopePhotoElectricModel" << G4endl;
>> 142
>> 143 G4int iZ = (G4int) Z;
>> 144 // if (!crossSectionHandler) //VI: should not be checked in run time
>> 145 // {
>> 146 // G4cout << "G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom" << G4endl;
>> 147 // G4cout << "The cross section handler is not correctly initialized" << G4endl;
>> 148 // G4Exception();
>> 149 // }
>> 150 G4double cs = crossSectionHandler->FindValue(iZ,energy);
247 151
248 if (energy < fIntrinsicLowEnergyLimit) << 152 if (verboseLevel > 2)
249 return 0; << 153 G4cout << "Gamma conversion cross section at " << energy/MeV << " MeV for Z=" << Z <<
250 <<
251 G4int iZ = G4int(Z); <<
252 <<
253 if (!fLogAtomicCrossSection[iZ]) <<
254 { <<
255 //If we are here, it means that Initial <<
256 //not filled up. This can happen in a U <<
257 if (fVerboseLevel > 0) <<
258 { <<
259 //Issue a G4Exception (warning) only in v <<
260 G4ExceptionDescription ed; <<
261 ed << "Unable to retrieve the cross secti <<
262 ed << "This can happen only in Unit Tests <<
263 G4Exception("G4PenelopeGammaConversionMod <<
264 "em2018",JustWarning,ed); <<
265 } <<
266 //protect file reading via autolock <<
267 G4AutoLock lock(&PenelopeGammaConversio <<
268 ReadDataFile(iZ); <<
269 lock.unlock(); <<
270 fLocalTable = true; <<
271 } <<
272 G4double cs = 0; <<
273 G4double logene = G4Log(energy); <<
274 G4PhysicsFreeVector* theVec = fLogAtomicCros <<
275 G4double logXS = theVec->Value(logene); <<
276 cs = G4Exp(logXS); <<
277 <<
278 if (fVerboseLevel > 2) <<
279 G4cout << "Gamma conversion cross section <<
280 " = " << cs/barn << " barn" << G4endl; 154 " = " << cs/barn << " barn" << G4endl;
281 return cs; 155 return cs;
282 } 156 }
283 157
284 //....oooOO0OOooo........oooOO0OOooo........oo 158 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
285 159
286 void << 160 void
287 G4PenelopeGammaConversionModel::SampleSecondar 161 G4PenelopeGammaConversionModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
288 const G4MaterialCutsCouple* coup 162 const G4MaterialCutsCouple* couple,
289 const G4DynamicParticle* aDynami 163 const G4DynamicParticle* aDynamicGamma,
290 G4double, 164 G4double,
291 G4double) 165 G4double)
292 { 166 {
293 // 167 //
294 // Penelope model v2008. << 168 // Penelope model.
295 // Final state is sampled according to the B 169 // Final state is sampled according to the Bethe-Heitler model with Coulomb
296 // corrections, according to the semi-empiri 170 // corrections, according to the semi-empirical model of
297 // J. Baro' et al., Radiat. Phys. Chem. 44 171 // J. Baro' et al., Radiat. Phys. Chem. 44 (1994) 531.
298 // 172 //
299 // The model uses the high energy Coulomb co << 173 // The model uses the high energy Coulomb correction from
300 // H. Davies et al., Phys. Rev. 93 (1954) 7 174 // H. Davies et al., Phys. Rev. 93 (1954) 788
301 // and atomic screening radii tabulated from << 175 // and atomic screening radii tabulated from
302 // J.H. Hubbel et al., J. Phys. Chem. Ref. 176 // J.H. Hubbel et al., J. Phys. Chem. Ref. Data 9 (1980) 1023
303 // for Z= 1 to 92. << 177 // for Z= 1 to 92. This managed in this model by the method
>> 178 // GetScreeningRadius().
304 // 179 //
305 if (fVerboseLevel > 3) << 180 if (verboseLevel > 3)
306 G4cout << "Calling SamplingSecondaries() o 181 G4cout << "Calling SamplingSecondaries() of G4PenelopeGammaConversionModel" << G4endl;
307 182
308 G4double photonEnergy = aDynamicGamma->GetKi 183 G4double photonEnergy = aDynamicGamma->GetKineticEnergy();
309 184
310 // Always kill primary 185 // Always kill primary
311 fParticleChange->ProposeTrackStatus(fStopAnd 186 fParticleChange->ProposeTrackStatus(fStopAndKill);
312 fParticleChange->SetProposedKineticEnergy(0. 187 fParticleChange->SetProposedKineticEnergy(0.);
313 188
314 if (photonEnergy <= fIntrinsicLowEnergyLimit 189 if (photonEnergy <= fIntrinsicLowEnergyLimit)
315 { 190 {
316 fParticleChange->ProposeLocalEnergyDepos 191 fParticleChange->ProposeLocalEnergyDeposit(photonEnergy);
317 return ; 192 return ;
318 } 193 }
319 194
320 G4ParticleMomentum photonDirection = aDynami 195 G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection();
321 const G4Material* mat = couple->GetMaterial( <<
322 196
323 //Either Initialize() was not called, or we << 197 G4double eps ;
324 //not invoked << 198 G4double eki = electron_mass_c2 / photonEnergy ;
325 if (!fEffectiveCharge) <<
326 { <<
327 //create a **thread-local** version of t <<
328 //Unit Tests <<
329 fLocalTable = true; <<
330 fEffectiveCharge = new std::map<const G4 <<
331 fMaterialInvScreeningRadius = new std::m <<
332 fScreeningFunction = new std::map<const <<
333 } <<
334 199
335 if (!fEffectiveCharge->count(mat)) << 200 // Do it fast if photon energy < 1.1 MeV
>> 201 if (photonEnergy < fSmallEnergy )
336 { 202 {
337 //If we are here, it means that Initiali << 203 eps = eki + (1-2*eki) * G4UniformRand();
338 //not filled up. This can happen in a Un <<
339 if (fVerboseLevel > 0) <<
340 { <<
341 //Issue a G4Exception (warning) only in ve <<
342 G4ExceptionDescription ed; <<
343 ed << "Unable to allocate the EffectiveCha <<
344 mat->GetName() << G4endl; <<
345 ed << "This can happen only in Unit Tests" <<
346 G4Exception("G4PenelopeGammaConversionMode <<
347 "em2019",JustWarning,ed); <<
348 } <<
349 //protect file reading via autolock <<
350 G4AutoLock lock(&PenelopeGammaConversion <<
351 InitializeScreeningFunctions(mat); <<
352 lock.unlock(); <<
353 } 204 }
354 <<
355 // eps is the fraction of the photon energy <<
356 G4double eps = 0; <<
357 G4double eki = electron_mass_c2/photonEnergy <<
358 <<
359 //Do it fast for photon energy < 1.1 MeV (cl <<
360 if (photonEnergy < fSmallEnergy) <<
361 eps = eki + (1.0-2.0*eki)*G4UniformRand(); <<
362 else 205 else
363 { 206 {
364 //Complete calculation << 207 // Select randomly one element in the current material
365 G4double effC = fEffectiveCharge->find(m << 208 if (verboseLevel > 2)
366 G4double alz = effC*fine_structure_const << 209 G4cout << "Going to select element in " << couple->GetMaterial()->GetName() << G4endl;
367 G4double T = std::sqrt(2.0*eki); << 210 //use crossSectionHandler instead of G4EmElementSelector because in this case
368 G4double F00=(-1.774-1.210e1*alz+1.118e1 << 211 //the dimension of the table is equal to the dimension of the database
369 +(8.523+7.326e1*alz-4.441e1*alz*alz)* << 212 //(less interpolation errors)
370 -(1.352e1+1.211e2*alz-9.641e1*alz*alz << 213 G4int Z_int = crossSectionHandler->SelectRandomAtom(couple,photonEnergy);
371 +(8.946+6.205e1*alz-6.341e1*alz*alz)*T*T*T*T << 214 if (verboseLevel > 2)
372 << 215 G4cout << "Selected Z = " << Z_int << G4endl;
373 G4double F0b = fScreeningFunction->find( << 216
374 G4double g0 = F0b + F00; << 217 //Low energy and Coulomb corrections
375 G4double invRad = fMaterialInvScreeningR << 218 G4double Z=(G4double) Z_int;
376 G4double bmin = 4.0*eki/invRad; << 219 G4double ZAlpha = Z*fine_structure_const;
377 std::pair<G4double,G4double> scree = Ge << 220 G4double ScreenRadius = GetScreeningRadius(Z);
378 G4double g1 = scree.first; << 221 G4double funct1=0,g0=0;
379 G4double g2 = scree.second; << 222 G4double g1min=0,g2min=0;
380 G4double g1min = g1+g0; << 223 funct1 = 4.0*std::log(ScreenRadius);
381 G4double g2min = g2+g0; << 224 g0 = funct1-4*CoulombCorrection(ZAlpha)+LowEnergyCorrection(ZAlpha,eki);
382 G4double xr = 0.5-eki; << 225 G4double bmin = 2*eki*ScreenRadius;
383 G4double a1 = 2.*g1min*xr*xr/3.; << 226 std::vector<G4double> ScreenFunctionValues = ScreenFunction(bmin);
384 G4double p1 = a1/(a1+g2min); << 227 if (ScreenFunctionValues.size() != 2)
>> 228 {
>> 229 G4cout << "G4PenelopeGammaConversionModel::SampleSecondaries" << G4endl;
>> 230 G4cout << "ScreenFunction did not return 2 values! Something wrong! " << G4endl;
>> 231 G4Exception();
>> 232 }
>> 233 g1min=g0+ScreenFunctionValues[0];
>> 234 g2min=g0+ScreenFunctionValues[1];
>> 235 G4double xr,a1,p1;
>> 236 xr=0.5-eki;
>> 237 a1=(2.0/3.0)*g1min*xr*xr;
>> 238 p1=a1/(a1+g2min);
385 239
386 G4bool loopAgain = false; <<
387 //Random sampling of eps 240 //Random sampling of eps
>> 241 G4double rand1,rand2,rand3,b;
>> 242 G4double g1;
>> 243
388 do{ 244 do{
389 loopAgain = false; << 245 rand1 = G4UniformRand();
390 if (G4UniformRand() <= p1) << 246 if (rand1 < p1) {
391 { << 247 rand2 = 2.0*G4UniformRand()-1.0;
392 G4double ru2m1 = 2.0*G4UniformRand()-1. << 248 if (rand2 < 0) {
393 if (ru2m1 < 0) << 249 eps = 0.5 - xr*std::pow(std::abs(rand2),(1./3.));
394 eps = 0.5-xr*std::pow(std::abs(ru2m1), <<
395 else <<
396 eps = 0.5+xr*std::pow(ru2m1,1./3.); <<
397 G4double B = eki/(invRad*eps*(1.0-eps)); <<
398 scree = GetScreeningFunctions(B); <<
399 g1 = scree.first; <<
400 g1 = std::max(g1+g0,0.); <<
401 if (G4UniformRand()*g1min > g1) <<
402 loopAgain = true; <<
403 } 250 }
404 else << 251 else
>> 252 {
>> 253 eps = 0.5 + xr*std::pow(rand2,(1./3.));
>> 254 }
>> 255 b = (eki*ScreenRadius)/(2*eps*(1.0-eps));
>> 256 std::vector<G4double> ScreenFunctionSampling = ScreenFunction(b);
>> 257 g1 = g0+ScreenFunctionSampling[0];
>> 258 if (g1 < 0) g1=0;
>> 259 rand3 = G4UniformRand()*g1min;
>> 260 }
>> 261 else
405 { 262 {
406 eps = eki+2.0*xr*G4UniformRand(); 263 eps = eki+2.0*xr*G4UniformRand();
407 G4double B = eki/(invRad*eps*(1.0-eps)); << 264 b = (eki*ScreenRadius)/(2*eps*(1.0-eps));
408 scree = GetScreeningFunctions(B); << 265 std::vector<G4double> ScreenFunctionSampling = ScreenFunction(b);
409 g2 = scree.second; << 266 g1 = g0+ScreenFunctionSampling[1];
410 g2 = std::max(g2+g0,0.); << 267 if (g1 < 0) g1=0;
411 if (G4UniformRand()*g2min > g2) << 268 rand3 = G4UniformRand()*g2min;
412 loopAgain = true; << 269 }
413 } << 270 } while (rand3>g1);
414 }while(loopAgain); << 271 } //End of eps sampling
415 } <<
416 if (fVerboseLevel > 4) <<
417 G4cout << "Sampled eps = " << eps << G4end <<
418 272
419 G4double electronTotEnergy = eps*photonEnerg 273 G4double electronTotEnergy = eps*photonEnergy;
420 G4double positronTotEnergy = (1.0-eps)*photo 274 G4double positronTotEnergy = (1.0-eps)*photonEnergy;
421 << 275
422 // Scattered electron (positron) angles. ( Z 276 // Scattered electron (positron) angles. ( Z - axis along the parent photon)
423 277
424 //electron kinematics 278 //electron kinematics
425 G4double electronKineEnergy = std::max(0.,el << 279 G4double costheta_el,costheta_po;
426 G4double costheta_el = G4UniformRand()*2.0-1 << 280 G4double phi_el,phi_po;
>> 281 G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
>> 282 costheta_el = G4UniformRand()*2.0-1.0;
427 G4double kk = std::sqrt(electronKineEnergy*( 283 G4double kk = std::sqrt(electronKineEnergy*(electronKineEnergy+2.*electron_mass_c2));
428 costheta_el = (costheta_el*electronTotEnergy 284 costheta_el = (costheta_el*electronTotEnergy+kk)/(electronTotEnergy+costheta_el*kk);
429 G4double phi_el = twopi * G4UniformRand() ; << 285 phi_el = twopi * G4UniformRand() ;
430 G4double dirX_el = std::sqrt(1.-costheta_el* 286 G4double dirX_el = std::sqrt(1.-costheta_el*costheta_el) * std::cos(phi_el);
431 G4double dirY_el = std::sqrt(1.-costheta_el* 287 G4double dirY_el = std::sqrt(1.-costheta_el*costheta_el) * std::sin(phi_el);
432 G4double dirZ_el = costheta_el; 288 G4double dirZ_el = costheta_el;
433 289
434 //positron kinematics 290 //positron kinematics
435 G4double positronKineEnergy = std::max(0.,po 291 G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
436 G4double costheta_po = G4UniformRand()*2.0-1 << 292 costheta_po = G4UniformRand()*2.0-1.0;
437 kk = std::sqrt(positronKineEnergy*(positronK 293 kk = std::sqrt(positronKineEnergy*(positronKineEnergy+2.*electron_mass_c2));
438 costheta_po = (costheta_po*positronTotEnergy 294 costheta_po = (costheta_po*positronTotEnergy+kk)/(positronTotEnergy+costheta_po*kk);
439 G4double phi_po = twopi * G4UniformRand() ; << 295 phi_po = twopi * G4UniformRand() ;
440 G4double dirX_po = std::sqrt(1.-costheta_po* 296 G4double dirX_po = std::sqrt(1.-costheta_po*costheta_po) * std::cos(phi_po);
441 G4double dirY_po = std::sqrt(1.-costheta_po* 297 G4double dirY_po = std::sqrt(1.-costheta_po*costheta_po) * std::sin(phi_po);
442 G4double dirZ_po = costheta_po; 298 G4double dirZ_po = costheta_po;
443 299
444 // Kinematics of the created pair: 300 // Kinematics of the created pair:
445 // the electron and positron are assumed to 301 // the electron and positron are assumed to have a symetric angular
446 // distribution with respect to the Z axis a 302 // distribution with respect to the Z axis along the parent photon
447 G4double localEnergyDeposit = 0. ; 303 G4double localEnergyDeposit = 0. ;
448 304
>> 305 //Generate explicitely the electron in the pair, only if it is > threshold
>> 306 //VI: applying cut here provides inconsistency
>> 307
449 if (electronKineEnergy > 0.0) 308 if (electronKineEnergy > 0.0)
450 { 309 {
451 G4ThreeVector electronDirection ( dirX_e 310 G4ThreeVector electronDirection ( dirX_el, dirY_el, dirZ_el);
452 electronDirection.rotateUz(photonDirecti 311 electronDirection.rotateUz(photonDirection);
453 G4DynamicParticle* electron = new G4Dyna 312 G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(),
454 electronDirection, 313 electronDirection,
455 electronKineEnergy); 314 electronKineEnergy);
456 fvect->push_back(electron); 315 fvect->push_back(electron);
457 } 316 }
458 else 317 else
459 { 318 {
460 localEnergyDeposit += electronKineEnergy 319 localEnergyDeposit += electronKineEnergy;
461 electronKineEnergy = 0; 320 electronKineEnergy = 0;
462 } 321 }
463 322
464 //Generate the positron. Real particle in an 323 //Generate the positron. Real particle in any case, because it will annihilate. If below
465 //threshold, produce it at rest 324 //threshold, produce it at rest
>> 325 // VI: here there was a bug - positron and electron cuts are different
466 if (positronKineEnergy < 0.0) 326 if (positronKineEnergy < 0.0)
467 { 327 {
468 localEnergyDeposit += positronKineEnergy 328 localEnergyDeposit += positronKineEnergy;
469 positronKineEnergy = 0; //produce it at 329 positronKineEnergy = 0; //produce it at rest
470 } 330 }
471 G4ThreeVector positronDirection(dirX_po,dirY 331 G4ThreeVector positronDirection(dirX_po,dirY_po,dirZ_po);
472 positronDirection.rotateUz(photonDirection); 332 positronDirection.rotateUz(photonDirection);
473 G4DynamicParticle* positron = new G4DynamicP 333 G4DynamicParticle* positron = new G4DynamicParticle(G4Positron::Positron(),
474 positronDirection, positronK 334 positronDirection, positronKineEnergy);
475 fvect->push_back(positron); 335 fvect->push_back(positron);
476 336
477 //Add rest of energy to the local energy dep 337 //Add rest of energy to the local energy deposit
478 fParticleChange->ProposeLocalEnergyDeposit(l 338 fParticleChange->ProposeLocalEnergyDeposit(localEnergyDeposit);
479 << 339
480 if (fVerboseLevel > 1) << 340 if (verboseLevel > 1)
481 { 341 {
482 G4cout << "----------------------------- 342 G4cout << "-----------------------------------------------------------" << G4endl;
483 G4cout << "Energy balance from G4Penelop 343 G4cout << "Energy balance from G4PenelopeGammaConversion" << G4endl;
484 G4cout << "Incoming photon energy: " << 344 G4cout << "Incoming photon energy: " << photonEnergy/keV << " keV" << G4endl;
485 G4cout << "----------------------------- 345 G4cout << "-----------------------------------------------------------" << G4endl;
486 if (electronKineEnergy) 346 if (electronKineEnergy)
487 G4cout << "Electron (explicitly produced) " << 347 G4cout << "Electron (explicitely produced) " << electronKineEnergy/keV << " keV"
488 << G4endl; 348 << G4endl;
489 if (positronKineEnergy) 349 if (positronKineEnergy)
490 G4cout << "Positron (not at rest) " << posit 350 G4cout << "Positron (not at rest) " << positronKineEnergy/keV << " keV" << G4endl;
491 G4cout << "Rest masses of e+/- " << 2.0* 351 G4cout << "Rest masses of e+/- " << 2.0*electron_mass_c2/keV << " keV" << G4endl;
492 if (localEnergyDeposit) 352 if (localEnergyDeposit)
493 G4cout << "Local energy deposit " << localEn 353 G4cout << "Local energy deposit " << localEnergyDeposit/keV << " keV" << G4endl;
494 G4cout << "Total final state: " << (elec 354 G4cout << "Total final state: " << (electronKineEnergy+positronKineEnergy+
495 localEnergyDeposit+2.0*electron_ma 355 localEnergyDeposit+2.0*electron_mass_c2)/keV <<
496 " keV" << G4endl; 356 " keV" << G4endl;
497 G4cout << "----------------------------- 357 G4cout << "-----------------------------------------------------------" << G4endl;
498 } 358 }
499 if (fVerboseLevel > 0) << 359 if (verboseLevel > 0)
500 { 360 {
501 G4double energyDiff = std::fabs(electron 361 G4double energyDiff = std::fabs(electronKineEnergy+positronKineEnergy+
502 localEnergyDeposit+2.0*electron_ 362 localEnergyDeposit+2.0*electron_mass_c2-photonEnergy);
503 if (energyDiff > 0.05*keV) 363 if (energyDiff > 0.05*keV)
504 G4cout << "Warning from G4PenelopeGammaConve << 364 G4cout << "Warning from G4PenelopeGammaConversion: problem with energy conservation: "
505 << (electronKineEnergy+positronKineEn 365 << (electronKineEnergy+positronKineEnergy+
506 localEnergyDeposit+2.0*electron_mass_c2 << 366 localEnergyDeposit+2.0*electron_mass_c2)/keV
507 << " keV (final) vs. " << photonEnerg 367 << " keV (final) vs. " << photonEnergy/keV << " keV (initial)" << G4endl;
508 } << 368 }
509 } 369 }
510 370
511 //....oooOO0OOooo........oooOO0OOooo........oo 371 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
512 372
513 void G4PenelopeGammaConversionModel::ReadDataF << 373 std::vector<G4double> G4PenelopeGammaConversionModel::ScreenFunction(G4double b)
514 { 374 {
515 if (!IsMaster()) << 375 std::vector<G4double> result;
516 //Should not be here! << 376 result.clear();
517 G4Exception("G4PenelopeGammaConversionMode << 377 G4double bsquare=b*b;
518 "em0100",FatalException,"Worker thread in << 378 G4double a0,f1,f2;
519 << 379 f1=2.0-2*std::log(1+bsquare);
520 if (fVerboseLevel > 2) << 380 f2=f1-(2.0/3.0);
521 { << 381 if (b < 1.0e-10)
522 G4cout << "G4PenelopeGammaConversionMode <<
523 G4cout << "Going to read Gamma Conversio <<
524 } <<
525 <<
526 const char* path = G4FindDataDir("G4LEDATA <<
527 if(!path) <<
528 { 382 {
529 G4String excep = << 383 f1=f1-twopi*b;
530 "G4PenelopeGammaConversionModel - G4LEDATA e <<
531 G4Exception("G4PenelopeGammaConversionMo <<
532 "em0006",FatalException,excep); <<
533 return; <<
534 } 384 }
535 <<
536 /* <<
537 Read the cross section file <<
538 */ <<
539 std::ostringstream ost; <<
540 if (Z>9) <<
541 ost << path << "/penelope/pairproduction/p <<
542 else 385 else
543 ost << path << "/penelope/pairproduction/p << 386 {
544 std::ifstream file(ost.str().c_str()); << 387 a0 = 4*b*std::atan(1.0/b);
545 if (!file.is_open()) << 388 f1 = f1 - a0;
546 { << 389 f2 = f2+2*bsquare*(4.0-a0-3*std::log((1+bsquare)/bsquare));
547 G4String excep = "G4PenelopeGammaConvers <<
548 G4String(ost.str()) + " not found!"; <<
549 G4Exception("G4PenelopeGammaConversionMo <<
550 "em0003",FatalException,excep); <<
551 } <<
552 <<
553 //I have to know in advance how many points <<
554 //to initialize the G4PhysicsFreeVector() <<
555 std::size_t ndata=0; <<
556 G4String line; <<
557 while( getline(file, line) ) <<
558 ndata++; <<
559 ndata -= 1; //remove one header line <<
560 <<
561 file.clear(); <<
562 file.close(); <<
563 file.open(ost.str().c_str()); <<
564 G4int readZ =0; <<
565 file >> readZ; <<
566 <<
567 if (fVerboseLevel > 3) <<
568 G4cout << "Element Z=" << Z << G4endl; <<
569 <<
570 //check the right file is opened. <<
571 if (readZ != Z) <<
572 { <<
573 G4ExceptionDescription ed; <<
574 ed << "Corrupted data file for Z=" << Z <<
575 G4Exception("G4PenelopeGammaConversionMo <<
576 "em0005",FatalException,ed); <<
577 } <<
578 <<
579 fLogAtomicCrossSection[Z] = new G4PhysicsFre <<
580 G4double ene=0,xs=0; <<
581 for (std::size_t i=0;i<ndata;++i) <<
582 { <<
583 file >> ene >> xs; <<
584 //dimensional quantities <<
585 ene *= eV; <<
586 xs *= barn; <<
587 if (xs < 1e-40*cm2) //protection against <<
588 xs = 1e-40*cm2; <<
589 fLogAtomicCrossSection[Z]->PutValue(i,G4 <<
590 } 390 }
591 file.close(); << 391 result.push_back(0.5*(3*f1-f2));
592 << 392 result.push_back(0.25*(3*f1+f2));
593 return; << 393 return result;
594 } 394 }
595 395
596 //....oooOO0OOooo........oooOO0OOooo........oo 396 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
597 397
598 void G4PenelopeGammaConversionModel::Initializ << 398 G4double G4PenelopeGammaConversionModel::GetScreeningRadius(G4double Z)
599 { 399 {
600 // This is subroutine GPPa0 of Penelope << 400 G4double result = 0;
601 // << 401 G4bool foundElement = false;
602 // 1) calculate the effective Z for the purp << 402 G4int iZ = (G4int) Z;
603 // << 403 if (!fTheScreeningRadii)
604 G4double zeff = 0; << 404 fTheScreeningRadii = new std::map<G4int,G4double>;
605 G4int intZ = 0; << 405
606 G4int nElements = (G4int)material->GetNumber << 406 if (fTheScreeningRadii->count(iZ))
607 const G4ElementVector* elementVector = mater << 407 {
608 << 408 //The element is already loaded: just return it
609 //avoid calculations if only one building el << 409 result = fTheScreeningRadii->find(iZ)->second;
610 if (nElements == 1) << 410 return result;
611 { <<
612 zeff = (*elementVector)[0]->GetZ(); <<
613 intZ = (G4int) zeff; <<
614 } 411 }
615 else // many elements...let's do the calcula << 412 else //retrieve all from file
616 { 413 {
617 const G4double* fractionVector = materia << 414 char* path = getenv("G4LEDATA");
618 << 415 if (!path)
619 G4double atot = 0; <<
620 for (G4int i=0;i<nElements;i++) <<
621 { 416 {
622 G4double Zelement = (*elementVector)[i]->G << 417 G4String excep = "G4PenelopeGammaConversionModel - G4LEDATA environment variable not set!";
623 G4double Aelement = (*elementVector)[i]->G << 418 G4Exception(excep);
624 atot += Aelement*fractionVector[i]; << 419 }
625 zeff += Zelement*Aelement*fractionVector[i << 420 G4String pathString(path);
>> 421 G4String pathFile = pathString + "/penelope/pp-pen.dat";
>> 422 std::ifstream file(pathFile);
>> 423
>> 424 if (!(file.is_open()))
>> 425 {
>> 426 G4String excep = "G4PenelopeGammaConversionModel - data file " + pathFile + "not found!";
>> 427 G4Exception(excep);
>> 428 }
>> 429 G4int k;
>> 430 G4double a1,a2;
>> 431 while(!file.eof()) {
>> 432 file >> k >> a1 >> a2;
>> 433 fTheScreeningRadii->insert(std::make_pair(k,a1));
>> 434 if ((G4double) k == Z)
>> 435 {
>> 436 result = a1;
>> 437 foundElement = true;
>> 438 }
>> 439 }
>> 440 file.close();
>> 441 if (verboseLevel > 2)
>> 442 G4cout << "Read file pp-pen.dat" << G4endl;
>> 443 if (foundElement)
>> 444 return result;
>> 445 else
>> 446 {
>> 447 G4String excep = "G4PenelopeGammaConversionModel - Screening Radius for not found in the data file";
>> 448 G4Exception(excep);
>> 449 return 0;
626 } 450 }
627 atot /= material->GetTotNbOfAtomsPerVolu <<
628 zeff /= (material->GetTotNbOfAtomsPerVol <<
629 <<
630 intZ = (G4int) (zeff+0.25); <<
631 if (intZ <= 0) <<
632 intZ = 1; <<
633 if (intZ > fMaxZ) <<
634 intZ = fMaxZ; <<
635 } <<
636 <<
637 if (fEffectiveCharge) <<
638 fEffectiveCharge->insert(std::make_pair(ma <<
639 <<
640 // <<
641 // 2) Calculate Coulomb Correction <<
642 // <<
643 G4double alz = fine_structure_const*zeff; <<
644 G4double alzSquared = alz*alz; <<
645 G4double fc = alzSquared*(0.202059-alzSquar <<
646 (0.03693-alzSquared* <<
647 (0.00835-alzSquared*(0.00201-alzSq <<
648 (0.00049-alzSquared* <<
649 (0.00012-alzSquared*0.00003))) <<
650 +1.0/(alzSquared+1.0)); <<
651 // <<
652 // 3) Screening functions and low-energy cor <<
653 // <<
654 G4double matRadius = 2.0/ fAtomicScreeningRa <<
655 if (fMaterialInvScreeningRadius) <<
656 fMaterialInvScreeningRadius->insert(std::m <<
657 <<
658 std::pair<G4double,G4double> myPair(0,0); <<
659 G4double f0a = 4.0*G4Log(fAtomicScreeningRad <<
660 G4double f0b = f0a - 4.0*fc; <<
661 myPair.first = f0a; <<
662 myPair.second = f0b; <<
663 <<
664 if (fScreeningFunction) <<
665 fScreeningFunction->insert(std::make_pair( <<
666 <<
667 if (fVerboseLevel > 2) <<
668 { <<
669 G4cout << "Average Z for material " << m <<
670 zeff << G4endl; <<
671 G4cout << "Effective radius for material <<
672 fAtomicScreeningRadius[intZ] << " m_e*c/hbar <<
673 matRadius << G4endl; <<
674 G4cout << "Screening parameters F0 for m <<
675 f0a << "," << f0b << G4endl; <<
676 } 451 }
677 return; <<
678 } 452 }
679 453
680 //....oooOO0OOooo........oooOO0OOooo........oo 454 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
681 455
682 std::pair<G4double,G4double> << 456 G4double G4PenelopeGammaConversionModel::CoulombCorrection(G4double a)
683 G4PenelopeGammaConversionModel::GetScreeningFu <<
684 { 457 {
685 // This is subroutine SCHIFF of Penelope << 458 G4double fc=0;
686 // << 459 G4double b[7] = {0.202059,-0.03693,0.00835,-0.00201,0.00049,-0.00012,0.00003};
687 // Screening Functions F1(B) and F2(B) in th << 460 G4double aSquared = a*a;
688 // section for pair production << 461 G4double aFourth = aSquared*aSquared;
689 // << 462 G4double aEighth = aFourth*aFourth;
690 std::pair<G4double,G4double> result(0.,0.); << 463
691 G4double BSquared = B*B; << 464 fc = ((1.0/(1.0+a*a))+b[0]+b[1]*aSquared+b[2]*aFourth+b[3]*(aSquared*aFourth)+
692 G4double f1 = 2.0-2.0*G4Log(1.0+BSquared); << 465 b[4]*aEighth+b[5]*(aEighth*aSquared)+b[6]*(aEighth*aFourth));
693 G4double f2 = f1 - 6.66666666e-1; // (-2/3) << 466 fc=aSquared*fc;
694 if (B < 1.0e-10) << 467 return fc;
695 f1 = f1-twopi*B; <<
696 else <<
697 { <<
698 G4double a0 = 4.0*B*std::atan(1./B); <<
699 f1 = f1 - a0; <<
700 f2 += 2.0*BSquared*(4.0-a0-3.0*G4Log((1. <<
701 } <<
702 G4double g1 = 0.5*(3.0*f1-f2); <<
703 G4double g2 = 0.25*(3.0*f1+f2); <<
704 <<
705 result.first = g1; <<
706 result.second = g2; <<
707 <<
708 return result; <<
709 } 468 }
710 469
711 //....oooOO0OOooo........oooOO0OOooo........oo << 470 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
712 471
713 void G4PenelopeGammaConversionModel::SetPartic << 472 G4double G4PenelopeGammaConversionModel::LowEnergyCorrection(G4double a,G4double eki)
714 { 473 {
715 if(!fParticle) { << 474 G4double f0=0,t=0;
716 fParticle = p; << 475 G4double b[12] = {-1.744,-12.10,11.18,8.523,73.26,-41.41,-13.52,-121.1,94.41,8.946,62.05,-63.41};
717 } << 476 t=std::sqrt(2.0*eki);
>> 477 G4double tSq = t*t;
>> 478 f0=(b[0]+b[1]*a+b[2]*a*a)*t+(b[3]+b[4]*a+b[5]*a*a)*(tSq)+(b[6]+b[7]*a+b[8]*a*a)*(tSq*t)+
>> 479 (b[9]+b[10]*a+b[11]*a*a)*(tSq*tSq);
>> 480 return f0;
>> 481
718 } 482 }
719 483