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25 // 25 //
>> 26 // $Id: G4MuBremsstrahlungModel.cc,v 1.24 2007/11/08 11:48:28 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-01-patch-01 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4MuBremsstrahlungModel 34 // File name: G4MuBremsstrahlungModel
33 // 35 //
34 // Author: Vladimir Ivanchenko on base 36 // Author: Vladimir Ivanchenko on base of Laszlo Urban code
35 // 37 //
36 // Creation date: 24.06.2002 38 // Creation date: 24.06.2002
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 41 //
40 // 04-12-02 Change G4DynamicParticle construct 42 // 04-12-02 Change G4DynamicParticle constructor in PostStepDoIt (V.Ivanchenko)
41 // 23-12-02 Change interface in order to move 43 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
42 // 24-01-03 Fix for compounds (V.Ivanchenko) 44 // 24-01-03 Fix for compounds (V.Ivanchenko)
43 // 27-01-03 Make models region aware (V.Ivanch 45 // 27-01-03 Make models region aware (V.Ivanchenko)
44 // 13-02-03 Add name (V.Ivanchenko) 46 // 13-02-03 Add name (V.Ivanchenko)
45 // 10-02-04 Add lowestKinEnergy (V.Ivanchenko) 47 // 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
46 // 08-04-05 Major optimisation of internal int << 48 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
47 // 03-08-05 Angular correlations according to << 49 // 03-08-05 Angular correlations according to PRM (V.Ivantchenko)
48 // 13-02-06 add ComputeCrossSectionPerAtom (mm 50 // 13-02-06 add ComputeCrossSectionPerAtom (mma)
49 // 21-03-06 Fix problem of initialisation in c 51 // 21-03-06 Fix problem of initialisation in case when cuts are not defined (VI)
50 // 07-11-07 Improve sampling of final state (A 52 // 07-11-07 Improve sampling of final state (A.Bogdanov)
51 // 28-02-08 Use precomputed Z^1/3 and Log(A) ( << 53 //
52 // 31-05-13 Use element selectors instead of l << 54
>> 55 //
>> 56 // Class Description:
>> 57 //
53 // 58 //
54 // ------------------------------------------- 59 // -------------------------------------------------------------------
55 // 60 //
56 //....oooOO0OOooo........oooOO0OOooo........oo 61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58 63
59 #include "G4MuBremsstrahlungModel.hh" 64 #include "G4MuBremsstrahlungModel.hh"
60 #include "G4PhysicalConstants.hh" <<
61 #include "G4SystemOfUnits.hh" <<
62 #include "G4Gamma.hh" 65 #include "G4Gamma.hh"
63 #include "G4MuonMinus.hh" 66 #include "G4MuonMinus.hh"
64 #include "G4MuonPlus.hh" 67 #include "G4MuonPlus.hh"
65 #include "Randomize.hh" 68 #include "Randomize.hh"
66 #include "G4Material.hh" 69 #include "G4Material.hh"
67 #include "G4Element.hh" 70 #include "G4Element.hh"
68 #include "G4ElementVector.hh" 71 #include "G4ElementVector.hh"
69 #include "G4ProductionCutsTable.hh" 72 #include "G4ProductionCutsTable.hh"
70 #include "G4ModifiedMephi.hh" <<
71 #include "G4ParticleChangeForLoss.hh" 73 #include "G4ParticleChangeForLoss.hh"
72 #include "G4Log.hh" <<
73 74
74 //....oooOO0OOooo........oooOO0OOooo........oo 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 76
>> 77 // static members
>> 78 //
>> 79 G4double G4MuBremsstrahlungModel::zdat[]={1., 4., 13., 29., 92.};
>> 80 G4double G4MuBremsstrahlungModel::adat[]={1.01, 9.01, 26.98, 63.55, 238.03};
>> 81 G4double G4MuBremsstrahlungModel::tdat[]={1.e3, 1.e4, 1.e5, 1.e6, 1.e7, 1.e8,
>> 82 1.e9, 1.e10};
>> 83
75 //....oooOO0OOooo........oooOO0OOooo........oo 84 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76 85
77 const G4double G4MuBremsstrahlungModel::xgi[] << 86 using namespace std;
78 {0.03377,0.16940,0.38069,0.61931,0.83060,0.9 <<
79 const G4double G4MuBremsstrahlungModel::wgi[] <<
80 {0.08566,0.18038,0.23396,0.23396,0.18038,0.0 <<
81 G4double G4MuBremsstrahlungModel::fDN[] = {0.0 <<
82 87
83 G4MuBremsstrahlungModel::G4MuBremsstrahlungMod 88 G4MuBremsstrahlungModel::G4MuBremsstrahlungModel(const G4ParticleDefinition* p,
84 89 const G4String& nam)
85 : G4VEmModel(nam), 90 : G4VEmModel(nam),
86 sqrte(std::sqrt(G4Exp(1.))), << 91 particle(0),
87 lowestKinEnergy(0.1*CLHEP::GeV), << 92 lowestKinEnergy(1.0*GeV),
88 minThreshold(0.9*CLHEP::keV) << 93 minThreshold(1.0*keV),
>> 94 nzdat(5),
>> 95 ntdat(8),
>> 96 NBIN(1000),
>> 97 cutFixed(0.98*keV),
>> 98 ignoreCut(false),
>> 99 samplingTablesAreFilled(false)
89 { 100 {
90 theGamma = G4Gamma::Gamma(); 101 theGamma = G4Gamma::Gamma();
91 nist = G4NistManager::Instance(); << 102 if(p) SetParticle(p);
>> 103 }
92 104
93 SetAngularDistribution(new G4ModifiedMephi() << 105 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
94 106
95 if (nullptr != p) { SetParticle(p); } << 107 G4MuBremsstrahlungModel::~G4MuBremsstrahlungModel()
96 if (0.0 == fDN[1]) { << 108 {
97 for (G4int i=1; i<93; ++i) { << 109 size_t n = partialSumSigma.size();
98 G4double dn = 1.54*nist->GetA27(i); << 110 if(n > 0) {
99 fDN[i] = dn; << 111 for(size_t i=0; i<n; i++) {
100 if(1 < i) { << 112 delete partialSumSigma[i];
101 fDN[i] /= std::pow(dn, 1./G4double(i)); <<
102 } <<
103 } 113 }
104 } 114 }
105 } 115 }
106 116
107 //....oooOO0OOooo........oooOO0OOooo........oo 117 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
108 118
109 G4double G4MuBremsstrahlungModel::MinEnergyCut 119 G4double G4MuBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*,
110 120 const G4MaterialCutsCouple*)
111 { 121 {
112 return minThreshold; 122 return minThreshold;
113 } 123 }
114 124
115 //....oooOO0OOooo........oooOO0OOooo........oo 125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
116 126
117 G4double G4MuBremsstrahlungModel::MinPrimaryEn <<
118 <<
119 <<
120 { <<
121 return std::max(lowestKinEnergy, cut); <<
122 } <<
123 <<
124 //....oooOO0OOooo........oooOO0OOooo........oo <<
125 <<
126 void G4MuBremsstrahlungModel::SetParticle(cons 127 void G4MuBremsstrahlungModel::SetParticle(const G4ParticleDefinition* p)
127 { 128 {
128 if(nullptr == particle) { << 129 if(!particle) {
129 particle = p; 130 particle = p;
130 mass = particle->GetPDGMass(); 131 mass = particle->GetPDGMass();
131 rmass = mass/CLHEP::electron_mass_c2 ; <<
132 cc = CLHEP::classic_electr_radius/rmass ; <<
133 coeff = 16.*CLHEP::fine_structure_const*cc <<
134 } 132 }
135 } 133 }
136 134
137 //....oooOO0OOooo........oooOO0OOooo........oo 135 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
138 136
139 void G4MuBremsstrahlungModel::Initialise(const 137 void G4MuBremsstrahlungModel::Initialise(const G4ParticleDefinition* p,
140 const 138 const G4DataVector& cuts)
141 { 139 {
142 SetParticle(p); << 140 if(p) SetParticle(p);
143 if(nullptr == fParticleChange) { <<
144 fParticleChange = GetParticleChangeForLoss <<
145 } <<
146 if(IsMaster() && p == particle && lowestKinE <<
147 InitialiseElementSelectors(p, cuts); <<
148 } <<
149 } <<
150 141
151 //....oooOO0OOooo........oooOO0OOooo........oo << 142 highKinEnergy = HighEnergyLimit();
152 143
153 void G4MuBremsstrahlungModel::InitialiseLocal( << 144 G4double fixedEnergy = 0.5*highKinEnergy;
154 << 145
155 { << 146 const G4ProductionCutsTable* theCoupleTable=
156 if(p == particle && lowestKinEnergy < HighEn << 147 G4ProductionCutsTable::GetProductionCutsTable();
157 SetElementSelectors(masterModel->GetElemen << 148 if(theCoupleTable) {
>> 149 G4int numOfCouples = theCoupleTable->GetTableSize();
>> 150
>> 151 G4int nn = partialSumSigma.size();
>> 152 G4int nc = cuts.size();
>> 153 if(nn > 0) {
>> 154 for (G4int ii=0; ii<nn; ii++){
>> 155 G4DataVector* a=partialSumSigma[ii];
>> 156 if ( a ) delete a;
>> 157 }
>> 158 partialSumSigma.clear();
>> 159 }
>> 160 if (numOfCouples>0) {
>> 161 for (G4int i=0; i<numOfCouples; i++) {
>> 162 G4double cute = DBL_MAX;
>> 163 if(i < nc) cute = cuts[i];
>> 164 if(cute < cutFixed || ignoreCut) cute = cutFixed;
>> 165 const G4MaterialCutsCouple* couple =
>> 166 theCoupleTable->GetMaterialCutsCouple(i);
>> 167 const G4Material* material = couple->GetMaterial();
>> 168 G4DataVector* dv = ComputePartialSumSigma(material,fixedEnergy,cute);
>> 169 partialSumSigma.push_back(dv);
>> 170 }
>> 171 }
158 } 172 }
>> 173 if(!samplingTablesAreFilled) MakeSamplingTables();
>> 174 if(pParticleChange)
>> 175 fParticleChange =
>> 176 reinterpret_cast<G4ParticleChangeForLoss*>(pParticleChange);
>> 177 else
>> 178 fParticleChange = new G4ParticleChangeForLoss();
159 } 179 }
160 180
161 //....oooOO0OOooo........oooOO0OOooo........oo 181 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
162 182
163 G4double G4MuBremsstrahlungModel::ComputeDEDXP 183 G4double G4MuBremsstrahlungModel::ComputeDEDXPerVolume(
164 << 184 const G4Material* material,
165 185 const G4ParticleDefinition*,
166 186 G4double kineticEnergy,
167 187 G4double cutEnergy)
168 { 188 {
169 G4double dedx = 0.0; 189 G4double dedx = 0.0;
170 if (kineticEnergy <= lowestKinEnergy) { retu << 190 if (kineticEnergy <= lowestKinEnergy || ignoreCut) return dedx;
171 191
172 G4double cut = std::max(cutEnergy, minThresh << 192 G4double tmax = kineticEnergy;
173 cut = std::min(cut, kineticEnergy); << 193 G4double cut = min(cutEnergy,tmax);
>> 194 if(cut < cutFixed) cut = cutFixed;
174 195
175 const G4ElementVector* theElementVector = ma 196 const G4ElementVector* theElementVector = material->GetElementVector();
176 const G4double* theAtomicNumDensityVector = 197 const G4double* theAtomicNumDensityVector =
177 material->GetAtomicNumDensityVector(); << 198 material->GetAtomicNumDensityVector();
178 199
179 // loop for elements in the material 200 // loop for elements in the material
180 for (size_t i=0; i<material->GetNumberOfElem << 201 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
181 G4double loss = << 202
182 ComputMuBremLoss((*theElementVector)[i]- << 203 G4double Z = (*theElementVector)[i]->GetZ();
>> 204 G4double A = (*theElementVector)[i]->GetA()/(g/mole) ;
>> 205
>> 206 G4double loss = ComputMuBremLoss(Z, A, kineticEnergy, cut);
>> 207
183 dedx += loss*theAtomicNumDensityVector[i]; 208 dedx += loss*theAtomicNumDensityVector[i];
184 } 209 }
185 // G4cout << "BR e= " << kineticEnergy << " << 210 if(dedx < 0.) dedx = 0.;
186 dedx = std::max(dedx, 0.); <<
187 return dedx; 211 return dedx;
188 } 212 }
189 213
190 //....oooOO0OOooo........oooOO0OOooo........oo 214 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
191 215
192 G4double G4MuBremsstrahlungModel::ComputMuBrem << 216 G4double G4MuBremsstrahlungModel::ComputMuBremLoss(G4double Z, G4double A,
193 217 G4double tkin, G4double cut)
194 { 218 {
195 G4double totalEnergy = mass + tkin; 219 G4double totalEnergy = mass + tkin;
196 static const G4double ak1 = 0.05; << 220 G4double ak1 = 0.05;
197 static const G4int k2 = 5; << 221 G4int k2=5;
>> 222 G4double xgi[]={0.03377,0.16940,0.38069,0.61931,0.83060,0.96623};
>> 223 G4double wgi[]={0.08566,0.18038,0.23396,0.23396,0.18038,0.08566};
198 G4double loss = 0.; 224 G4double loss = 0.;
199 225
200 G4double vcut = cut/totalEnergy; 226 G4double vcut = cut/totalEnergy;
201 G4int kkk = (G4int)(vcut/ak1) + k2; << 227 G4double vmax = tkin/totalEnergy;
202 if (kkk > 8) { kkk = 8; } << 228
203 else if (kkk < 1) { kkk = 1; } << 229 G4double aaa = 0.;
204 G4double hhh = vcut/(G4double)(kkk); << 230 G4double bbb = vcut;
205 << 231 if(vcut>vmax) bbb=vmax ;
206 G4double aa = 0.; << 232 G4int kkk = (G4int)((bbb-aaa)/ak1)+k2 ;
207 for(G4int l=0; l<kkk; ++l) { << 233 G4double hhh=(bbb-aaa)/float(kkk) ;
208 for(G4int i=0; i<6; ++i) { << 234
>> 235 G4double aa = aaa;
>> 236 for(G4int l=0; l<kkk; l++)
>> 237 {
>> 238 for(G4int i=0; i<6; i++)
>> 239 {
209 G4double ep = (aa + xgi[i]*hhh)*totalEne 240 G4double ep = (aa + xgi[i]*hhh)*totalEnergy;
210 loss += ep*wgi[i]*ComputeDMicroscopicCro << 241 loss += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, A, ep);
211 } 242 }
212 aa += hhh; 243 aa += hhh;
213 } 244 }
214 245
215 loss *= hhh*totalEnergy; << 246 loss *=hhh*totalEnergy ;
>> 247
216 return loss; 248 return loss;
217 } 249 }
218 250
219 //....oooOO0OOooo........oooOO0OOooo........oo 251 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
220 252
221 G4double G4MuBremsstrahlungModel::ComputeMicro 253 G4double G4MuBremsstrahlungModel::ComputeMicroscopicCrossSection(
222 G4d 254 G4double tkin,
223 G4d 255 G4double Z,
>> 256 G4double A,
224 G4d 257 G4double cut)
225 { 258 {
226 G4double totalEnergy = tkin + mass; 259 G4double totalEnergy = tkin + mass;
227 static const G4double ak1 = 2.3; << 260 G4double ak1 = 2.3;
228 static const G4int k2 = 4; << 261 G4int k2 = 4;
>> 262 G4double xgi[]={0.03377,0.16940,0.38069,0.61931,0.83060,0.96623};
>> 263 G4double wgi[]={0.08566,0.18038,0.23396,0.23396,0.18038,0.08566};
229 G4double cross = 0.; 264 G4double cross = 0.;
230 265
231 if(cut >= tkin) return cross; 266 if(cut >= tkin) return cross;
232 267
233 G4double vcut = cut/totalEnergy; 268 G4double vcut = cut/totalEnergy;
234 G4double vmax = tkin/totalEnergy; 269 G4double vmax = tkin/totalEnergy;
235 270
236 G4double aaa = G4Log(vcut); << 271 G4double aaa = log(vcut);
237 G4double bbb = G4Log(vmax); << 272 G4double bbb = log(vmax);
238 G4int kkk = (G4int)((bbb-aaa)/ak1) + k2 ; << 273 G4int kkk = (G4int)((bbb-aaa)/ak1)+k2 ;
239 if(kkk > 8) { kkk = 8; } << 274 G4double hhh = (bbb-aaa)/float(kkk);
240 else if (kkk < 1) { kkk = 1; } << 275
241 G4double hhh = (bbb-aaa)/(G4double)(kkk); <<
242 G4double aa = aaa; 276 G4double aa = aaa;
243 277
244 for(G4int l=0; l<kkk; ++l) { << 278 for(G4int l=0; l<kkk; l++)
245 for(G4int i=0; i<6; ++i) { << 279 {
246 G4double ep = G4Exp(aa + xgi[i]*hhh)*tot << 280 for(G4int i=0; i<6; i++)
247 cross += ep*wgi[i]*ComputeDMicroscopicCr << 281 {
>> 282 G4double ep = exp(aa + xgi[i]*hhh)*totalEnergy;
>> 283 cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, A, ep);
248 } 284 }
249 aa += hhh; 285 aa += hhh;
250 } 286 }
251 287
252 cross *= hhh; << 288 cross *=hhh;
253 //G4cout << "BR e= " << tkin<< " cross= " < << 289
254 return cross; 290 return cross;
255 } 291 }
256 292
257 //....oooOO0OOooo........oooOO0OOooo........oo 293 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
258 294
259 G4double G4MuBremsstrahlungModel::ComputeDMicr 295 G4double G4MuBremsstrahlungModel::ComputeDMicroscopicCrossSection(
260 G4d 296 G4double tkin,
261 G4d 297 G4double Z,
>> 298 G4double A,
262 G4d 299 G4double gammaEnergy)
263 // differential cross section 300 // differential cross section
264 { 301 {
>> 302 static const G4double sqrte=sqrt(exp(1.)) ;
>> 303 static const G4double bh=202.4,bh1=446.,btf=183.,btf1=1429. ;
>> 304 static const G4double rmass=mass/electron_mass_c2 ;
>> 305 static const G4double cc=classic_electr_radius/rmass ;
>> 306 static const G4double coeff= 16.*fine_structure_const*cc*cc/3. ;
>> 307
265 G4double dxsection = 0.; 308 G4double dxsection = 0.;
266 if(gammaEnergy > tkin) { return dxsection; } << 309
>> 310 if( gammaEnergy > tkin) return dxsection ;
267 311
268 G4double E = tkin + mass ; 312 G4double E = tkin + mass ;
269 G4double v = gammaEnergy/E ; 313 G4double v = gammaEnergy/E ;
270 G4double delta = 0.5*mass*mass*v/(E-gammaEne 314 G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
271 G4double rab0 = delta*sqrte ; << 315 G4double rab0=delta*sqrte ;
>> 316
>> 317 G4double z13 = exp(-log(Z)/3.) ;
>> 318 G4double dn = 1.54*exp(0.27*log(A)) ;
>> 319
>> 320 G4double b,b1,dnstar ;
272 321
273 G4int iz = G4lrint(Z); << 322 if(Z<1.5)
274 if(iz < 1) { iz = 1; } << 323 {
275 else if(iz > 92) { iz = 92; } << 324 b=bh;
276 << 325 b1=bh1;
277 G4double z13 = 1.0/nist->GetZ13(iz); << 326 dnstar=dn ;
278 G4double dnstar = fDN[iz]; << 327 }
279 << 328 else
280 G4double b,b1; << 329 {
281 if(1 == iz) { << 330 b=btf;
282 b = bh; << 331 b1=btf1;
283 b1 = bh1; << 332 dnstar = exp((1.-1./Z)*log(dn)) ;
284 } else { <<
285 b = btf; <<
286 b1 = btf1; <<
287 } 333 }
288 334
289 // nucleus contribution logarithm 335 // nucleus contribution logarithm
290 G4double rab1 = b*z13; << 336 G4double rab1=b*z13;
291 G4double fn = G4Log(rab1/(dnstar*(CLHEP::ele << 337 G4double fn=log(rab1/(dnstar*(electron_mass_c2+rab0*rab1))*
292 (mass + delta*(dnstar*sqrte-2.))); << 338 (mass+delta*(dnstar*sqrte-2.))) ;
293 fn = std::max(fn, 0.); << 339 if(fn <0.) fn = 0. ;
294 // electron contribution logarithm 340 // electron contribution logarithm
295 G4double epmax1 = E/(1.+0.5*mass*rmass/E); << 341 G4double epmax1=E/(1.+0.5*mass*rmass/E) ;
296 G4double fe = 0.; << 342 G4double fe=0.;
297 if(gammaEnergy < epmax1) { << 343 if(gammaEnergy<epmax1)
298 G4double rab2 = b1*z13*z13; << 344 {
299 fe = G4Log(rab2*mass/((1.+delta*rmass/(CLH << 345 G4double rab2=b1*z13*z13 ;
300 (CLHEP::electron_mass_c2+rab0*rab2))); << 346 fe=log(rab2*mass/((1.+delta*rmass/(electron_mass_c2*sqrte))*
301 fe = std::max(fe, 0.); << 347 (electron_mass_c2+rab0*rab2))) ;
>> 348 if(fe<0.) fe=0. ;
302 } 349 }
303 350
304 dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn 351 dxsection = coeff*(1.-v*(1. - 0.75*v))*Z*(fn*Z + fe)/gammaEnergy;
305 dxsection = std::max(dxsection, 0.0); << 352
306 return dxsection; 353 return dxsection;
307 } 354 }
308 355
309 //....oooOO0OOooo........oooOO0OOooo........oo 356 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
310 357
311 G4double G4MuBremsstrahlungModel::ComputeCross 358 G4double G4MuBremsstrahlungModel::ComputeCrossSectionPerAtom(
312 con 359 const G4ParticleDefinition*,
313 360 G4double kineticEnergy,
314 << 361 G4double Z, G4double A,
315 362 G4double cutEnergy,
316 << 363 G4double)
>> 364 {
>> 365 G4double cut = min(cutEnergy, kineticEnergy);
>> 366 if(cut < cutFixed || ignoreCut) cut = cutFixed;
>> 367 G4double cross =
>> 368 ComputeMicroscopicCrossSection (kineticEnergy, Z, A/(g/mole), cut);
>> 369 return cross;
>> 370 }
>> 371
>> 372 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 373
>> 374 G4double G4MuBremsstrahlungModel::CrossSectionPerVolume(
>> 375 const G4Material* material,
>> 376 const G4ParticleDefinition*,
>> 377 G4double kineticEnergy,
>> 378 G4double cutEnergy,
>> 379 G4double maxEnergy)
317 { 380 {
318 G4double cross = 0.0; 381 G4double cross = 0.0;
319 if (kineticEnergy <= lowestKinEnergy) return << 382 if (cutEnergy >= maxEnergy || kineticEnergy <= lowestKinEnergy) return cross;
320 G4double tmax = std::min(maxEnergy, kineticE << 383
321 G4double cut = std::min(cutEnergy, kineticE << 384 G4double tmax = min(maxEnergy, kineticEnergy);
322 if (cut < minThreshold) cut = minThreshold; << 385 G4double cut = min(cutEnergy, tmax);
323 if (cut >= tmax) return cross; << 386 if(cut < cutFixed || ignoreCut) cut = cutFixed;
324 << 387
325 cross = ComputeMicroscopicCrossSection (kine << 388 const G4ElementVector* theElementVector = material->GetElementVector();
326 if(tmax < kineticEnergy) { << 389 const G4double* theAtomNumDensityVector =
327 cross -= ComputeMicroscopicCrossSection(ki << 390 material->GetAtomicNumDensityVector();
>> 391
>> 392 for (size_t i=0; i<material->GetNumberOfElements(); i++) {
>> 393
>> 394 G4double Z = (*theElementVector)[i]->GetZ();
>> 395 G4double A = (*theElementVector)[i]->GetA()/(g/mole);
>> 396
>> 397 G4double cr = ComputeMicroscopicCrossSection(kineticEnergy, Z, A, cut);
>> 398
>> 399 if(tmax < kineticEnergy) {
>> 400 cr -= ComputeMicroscopicCrossSection(kineticEnergy, Z, A, tmax);
>> 401 }
>> 402 cross += theAtomNumDensityVector[i] * cr;
328 } 403 }
>> 404
329 return cross; 405 return cross;
330 } 406 }
331 407
332 //....oooOO0OOooo........oooOO0OOooo........oo 408 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
333 409
334 void G4MuBremsstrahlungModel::SampleSecondarie << 410 G4DataVector* G4MuBremsstrahlungModel::ComputePartialSumSigma(
335 std::vector<G4Dy << 411 const G4Material* material,
336 const G4Material << 412 G4double kineticEnergy,
337 const G4DynamicP << 413 G4double cut)
338 G4double minEner << 414
339 G4double maxEner << 415 // Build the table of cross section per element. The table is built for MATERIAL
>> 416 // This table is used by DoIt to select randomly an element in the material.
>> 417 {
>> 418 G4int nElements = material->GetNumberOfElements();
>> 419 const G4ElementVector* theElementVector = material->GetElementVector();
>> 420 const G4double* theAtomNumDensityVector =
>> 421 material->GetAtomicNumDensityVector();
>> 422
>> 423 G4DataVector* dv = new G4DataVector();
>> 424
>> 425 G4double cross = 0.0;
>> 426
>> 427 for (G4int i=0; i<nElements; i++ ) {
>> 428
>> 429 G4double Z = (*theElementVector)[i]->GetZ();
>> 430 G4double A = (*theElementVector)[i]->GetA()/(g/mole) ;
>> 431 cross += theAtomNumDensityVector[i]
>> 432 * ComputeMicroscopicCrossSection(kineticEnergy, Z, A, cut);
>> 433 dv->push_back(cross);
>> 434 }
>> 435 return dv;
>> 436 }
>> 437
>> 438 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 439
>> 440 void G4MuBremsstrahlungModel::MakeSamplingTables()
>> 441 {
>> 442
>> 443 G4double AtomicNumber,AtomicWeight,KineticEnergy,
>> 444 TotalEnergy,Maxep;
>> 445
>> 446 for (G4int iz=0; iz<nzdat; iz++)
>> 447 {
>> 448 AtomicNumber = zdat[iz];
>> 449 AtomicWeight = adat[iz]*g/mole ;
>> 450
>> 451 for (G4int it=0; it<ntdat; it++)
>> 452 {
>> 453 KineticEnergy = tdat[it];
>> 454 TotalEnergy = KineticEnergy + mass;
>> 455 Maxep = KineticEnergy ;
>> 456
>> 457 G4double CrossSection = 0.0 ;
>> 458
>> 459 // calculate the differential cross section
>> 460 // numerical integration in
>> 461 // log ...............
>> 462 G4double c = log(Maxep/cutFixed) ;
>> 463 G4double ymin = -5. ;
>> 464 G4double ymax = 0. ;
>> 465 G4double dy = (ymax-ymin)/NBIN ;
>> 466
>> 467 G4double y = ymin - 0.5*dy ;
>> 468 G4double yy = ymin - dy ;
>> 469 G4double x = exp(y);
>> 470 G4double fac = exp(dy);
>> 471 G4double dx = exp(yy)*(fac - 1.0);
>> 472
>> 473 for (G4int i=0 ; i<NBIN; i++)
>> 474 {
>> 475 y += dy ;
>> 476 x *= fac;
>> 477 dx*= fac;
>> 478 G4double ep = cutFixed*exp(c*x) ;
>> 479
>> 480 CrossSection += ep*dx*ComputeDMicroscopicCrossSection(
>> 481 KineticEnergy,AtomicNumber,
>> 482 AtomicWeight,ep) ;
>> 483 ya[i]=y ;
>> 484 proba[iz][it][i] = CrossSection ;
>> 485
>> 486 }
>> 487
>> 488 proba[iz][it][NBIN] = CrossSection ;
>> 489 ya[NBIN] = 0. ; // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>> 490
>> 491 if(CrossSection > 0.)
>> 492 {
>> 493 for(G4int ib=0; ib<=NBIN; ib++)
>> 494 {
>> 495 proba[iz][it][ib] /= CrossSection ;
>> 496 }
>> 497 }
>> 498 }
>> 499 }
>> 500 samplingTablesAreFilled = true;
>> 501 }
>> 502
>> 503 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 504
>> 505 void G4MuBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
>> 506 const G4MaterialCutsCouple* couple,
>> 507 const G4DynamicParticle* dp,
>> 508 G4double minEnergy,
>> 509 G4double maxEnergy)
340 { 510 {
341 G4double kineticEnergy = dp->GetKineticEnerg 511 G4double kineticEnergy = dp->GetKineticEnergy();
342 // check against insufficient energy 512 // check against insufficient energy
343 G4double tmax = std::min(kineticEnergy, maxE << 513 G4double tmax = min(kineticEnergy, maxEnergy);
344 G4double tmin = std::min(kineticEnergy, minE << 514 G4double tmin = min(kineticEnergy, minEnergy);
345 tmin = std::max(tmin, minThreshold); << 515 if(tmin < cutFixed || ignoreCut) tmin = cutFixed;
346 if(tmin >= tmax) return; 516 if(tmin >= tmax) return;
347 517
>> 518 // ===== the begining of a new code ======
348 // ===== sampling of energy transfer ====== 519 // ===== sampling of energy transfer ======
349 520
350 G4ParticleMomentum partDirection = dp->GetMo 521 G4ParticleMomentum partDirection = dp->GetMomentumDirection();
351 522
352 // select randomly one element constituing t 523 // select randomly one element constituing the material
353 const G4Element* anElement = SelectRandomAto << 524 const G4Element* anElement = SelectRandomAtom(couple);
354 G4double Z = anElement->GetZ(); <<
355 G4double func1 = tmin* <<
356 ComputeDMicroscopicCrossSection(kineticEne <<
357 525
358 G4double gEnergy; << 526 G4double totalEnergy = kineticEnergy + mass;
359 G4double func2; << 527 G4double totalMomentum = sqrt(kineticEnergy*(kineticEnergy + 2.0*mass));
>> 528
>> 529 G4double AtomicNumber = anElement->GetZ();
>> 530 G4double AtomicWeight = anElement->GetA()/(g/mole);
360 531
361 G4double xmin = G4Log(tmin/minThreshold); << 532 G4double func1 = tmin*ComputeDMicroscopicCrossSection(
362 G4double xmax = G4Log(tmax/tmin); << 533 kineticEnergy,AtomicNumber,
>> 534 AtomicWeight,tmin);
>> 535
>> 536 G4double lnepksi, epksi;
>> 537 G4double func2;
>> 538 G4double ksi2;
363 539
364 do { 540 do {
365 gEnergy = minThreshold*G4Exp(xmin + G4Unif << 541 lnepksi = log(tmin) + G4UniformRand()*log(kineticEnergy/tmin);
366 func2 = gEnergy*ComputeDMicroscopicCrossSe << 542 epksi = exp(lnepksi);
367 << 543 func2 = epksi*ComputeDMicroscopicCrossSection(
368 // Loop checking, 03-Aug-2015, Vladimir Iv << 544 kineticEnergy,AtomicNumber,
369 } while(func2 < func1*G4UniformRand()); << 545 AtomicWeight,epksi);
>> 546 ksi2 = G4UniformRand();
>> 547
>> 548 } while(func2/func1 < ksi2);
>> 549
>> 550 // ===== the end of a new code =====
370 551
371 // angles of the emitted gamma using general <<
372 G4ThreeVector gamDir = <<
373 GetAngularDistribution()->SampleDirection( <<
374 <<
375 // create G4DynamicParticle object for the G 552 // create G4DynamicParticle object for the Gamma
376 G4DynamicParticle* gamma = new G4DynamicPart << 553 G4double gEnergy = epksi;
377 vdp->push_back(gamma); << 554
>> 555 // sample angle
>> 556 G4double gam = totalEnergy/mass;
>> 557 G4double rmax = gam*min(1.0, totalEnergy/gEnergy - 1.0);
>> 558 rmax *= rmax;
>> 559 G4double x = G4UniformRand()*rmax/(1.0 + rmax);
>> 560
>> 561 G4double theta = sqrt(x/(1.0 - x))/gam;
>> 562 G4double sint = sin(theta);
>> 563 G4double phi = twopi * G4UniformRand() ;
>> 564 G4double dirx = sint*cos(phi), diry = sint*sin(phi), dirz = cos(theta) ;
>> 565
>> 566 G4ThreeVector gDirection(dirx, diry, dirz);
>> 567 gDirection.rotateUz(partDirection);
>> 568
>> 569 partDirection *= totalMomentum;
>> 570 partDirection -= gEnergy*gDirection;
>> 571 partDirection = partDirection.unit();
>> 572
>> 573 // primary change
>> 574 kineticEnergy -= gEnergy;
>> 575 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
>> 576 fParticleChange->SetProposedMomentumDirection(partDirection);
>> 577
>> 578 // save secondary
>> 579 G4DynamicParticle* aGamma = new G4DynamicParticle(theGamma,gDirection,gEnergy);
>> 580 vdp->push_back(aGamma);
>> 581 }
>> 582
>> 583 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 584
>> 585 const G4Element* G4MuBremsstrahlungModel::SelectRandomAtom(
>> 586 const G4MaterialCutsCouple* couple) const
>> 587 {
>> 588 // select randomly 1 element within the material
>> 589
>> 590 const G4Material* material = couple->GetMaterial();
>> 591 G4int nElements = material->GetNumberOfElements();
>> 592 const G4ElementVector* theElementVector = material->GetElementVector();
>> 593 if(1 == nElements) return (*theElementVector)[0];
>> 594 else if(1 > nElements) return 0;
378 595
379 // compute post-interaction kinematics of pr << 596 G4DataVector* dv = partialSumSigma[couple->GetIndex()];
380 // energy-momentum conservation << 597 G4double rval = G4UniformRand()*((*dv)[nElements-1]);
381 const G4double totMomentum = << 598 for (G4int i=0; i<nElements; i++) {
382 std::sqrt(kineticEnergy*(kineticEnergy + 2 << 599 if (rval <= (*dv)[i]) return (*theElementVector)[i];
383 G4ThreeVector dir = <<
384 (totMomentum*dp->GetMomentumDirection() - <<
385 const G4double finalE = kineticEnergy - gEne <<
386 <<
387 // if secondary gamma energy is higher than <<
388 // then stop tracking the primary particle a <<
389 // instead of the primary one <<
390 if (gEnergy > SecondaryThreshold()) { <<
391 fParticleChange->ProposeTrackStatus(fStopA <<
392 fParticleChange->SetProposedKineticEnergy( <<
393 G4DynamicParticle* newdp = new G4DynamicPa <<
394 vdp->push_back(newdp); <<
395 } else { <<
396 // continue tracking the primary e-/e+ oth <<
397 fParticleChange->SetProposedMomentumDirect <<
398 fParticleChange->SetProposedKineticEnergy( <<
399 } 600 }
>> 601 return (*theElementVector)[nElements-1];
400 } 602 }
401 603
402 //....oooOO0OOooo........oooOO0OOooo........oo 604 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
403 605