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>> 26 // $Id: G4UniversalFluctuation.cc 106265 2017-09-26 23:32:49Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4UniversalFluctuation 33 // File name: G4UniversalFluctuation
33 // 34 //
34 // Author: V. Ivanchenko for Laszlo Urb 35 // Author: V. Ivanchenko for Laszlo Urban
35 // 36 //
36 // Creation date: 03.01.2002 37 // Creation date: 03.01.2002
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 40 //
40 // 41 //
41 42
42 //....oooOO0OOooo........oooOO0OOooo........oo 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
43 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 45
45 #include "G4UniversalFluctuation.hh" 46 #include "G4UniversalFluctuation.hh"
46 #include "G4PhysicalConstants.hh" 47 #include "G4PhysicalConstants.hh"
47 #include "G4SystemOfUnits.hh" 48 #include "G4SystemOfUnits.hh"
48 #include "Randomize.hh" 49 #include "Randomize.hh"
49 #include "G4Poisson.hh" 50 #include "G4Poisson.hh"
>> 51 #include "G4Step.hh"
50 #include "G4Material.hh" 52 #include "G4Material.hh"
51 #include "G4MaterialCutsCouple.hh" 53 #include "G4MaterialCutsCouple.hh"
52 #include "G4DynamicParticle.hh" 54 #include "G4DynamicParticle.hh"
53 #include "G4ParticleDefinition.hh" 55 #include "G4ParticleDefinition.hh"
54 #include "G4Log.hh" 56 #include "G4Log.hh"
>> 57 #include "G4Exp.hh"
55 58
56 //....oooOO0OOooo........oooOO0OOooo........oo 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
57 60
>> 61 using namespace std;
>> 62
58 G4UniversalFluctuation::G4UniversalFluctuation 63 G4UniversalFluctuation::G4UniversalFluctuation(const G4String& nam)
59 :G4VEmFluctuationModel(nam), 64 :G4VEmFluctuationModel(nam),
60 minLoss(10.*CLHEP::eV) << 65 particle(nullptr),
>> 66 minNumberInteractionsBohr(10.0),
>> 67 minLoss(10.*eV),
>> 68 nmaxCont(16.),
>> 69 rate(0.56),
>> 70 a0(50.),
>> 71 fw(4.00)
61 { 72 {
62 rndmarray = new G4double[sizearray]; << 73 lastMaterial = nullptr;
>> 74 particleMass = chargeSquare = ipotFluct = electronDensity = f1Fluct = f2Fluct
>> 75 = e1Fluct = e2Fluct = e1LogFluct = e2LogFluct = ipotLogFluct = e0 = esmall
>> 76 = e1 = e2 = 0.0;
>> 77 m_Inv_particleMass = m_massrate = DBL_MAX;
>> 78 sizearray = 30;
>> 79 rndmarray = new G4double[30];
63 } 80 }
64 81
65 //....oooOO0OOooo........oooOO0OOooo........oo 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66 83
67 G4UniversalFluctuation::~G4UniversalFluctuatio 84 G4UniversalFluctuation::~G4UniversalFluctuation()
68 { 85 {
69 delete [] rndmarray; 86 delete [] rndmarray;
70 } 87 }
71 88
72 //....oooOO0OOooo........oooOO0OOooo........oo 89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
73 90
74 void G4UniversalFluctuation::InitialiseMe(cons 91 void G4UniversalFluctuation::InitialiseMe(const G4ParticleDefinition* part)
75 { 92 {
76 particle = part; << 93 particle = part;
77 particleMass = part->GetPDGMass(); << 94 particleMass = part->GetPDGMass();
78 const G4double q = part->GetPDGCharge()/CLHE << 95 G4double q = part->GetPDGCharge()/eplus;
79 96
80 // Derived quantities 97 // Derived quantities
81 m_Inv_particleMass = 1.0 / particleMass; 98 m_Inv_particleMass = 1.0 / particleMass;
82 m_massrate = CLHEP::electron_mass_c2 * m_Inv << 99 m_massrate = electron_mass_c2 * m_Inv_particleMass ;
83 chargeSquare = q*q; << 100 chargeSquare = q*q;
84 } 101 }
85 102
86 //....oooOO0OOooo........oooOO0OOooo........oo 103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
87 104
88 G4double 105 G4double
89 G4UniversalFluctuation::SampleFluctuations(con 106 G4UniversalFluctuation::SampleFluctuations(const G4MaterialCutsCouple* couple,
90 con 107 const G4DynamicParticle* dp,
91 con << 108 G4double tmax,
92 con << 109 G4double length,
93 con << 110 G4double averageLoss)
94 con <<
95 { 111 {
96 // Calculate actual loss from the mean loss. 112 // Calculate actual loss from the mean loss.
97 // The model used to get the fluctuations is 113 // The model used to get the fluctuations is essentially the same
98 // as in Glandz in Geant3 (Cern program libr 114 // as in Glandz in Geant3 (Cern program library W5013, phys332).
99 // L. Urban et al. NIM A362, p.416 (1995) an 115 // L. Urban et al. NIM A362, p.416 (1995) and Geant4 Physics Reference Manual
100 116
101 // shortcut for very small loss or from a st 117 // shortcut for very small loss or from a step nearly equal to the range
102 // (out of validity of the model) 118 // (out of validity of the model)
103 // 119 //
104 if (averageLoss < minLoss) { return averageL << 120 G4double meanLoss = averageLoss;
105 meanLoss = averageLoss; << 121 G4double tkin = dp->GetKineticEnergy();
106 const G4double tkin = dp->GetKineticEnergy( <<
107 //G4cout<< "Emean= "<< meanLoss<< " tmax= "< 122 //G4cout<< "Emean= "<< meanLoss<< " tmax= "<< tmax<< " L= "<<length<<G4endl;
>> 123 if (meanLoss < minLoss) { return meanLoss; }
108 124
109 if(dp->GetDefinition() != particle) { Initia 125 if(dp->GetDefinition() != particle) { InitialiseMe(dp->GetDefinition()); }
110 126
111 CLHEP::HepRandomEngine* rndmEngineF = G4Rand 127 CLHEP::HepRandomEngine* rndmEngineF = G4Random::getTheEngine();
112 << 128
113 const G4double gam = tkin * m_Inv_particle << 129 G4double tau = tkin * m_Inv_particleMass;
114 const G4double gam2 = gam*gam; << 130 G4double gam = tau + 1.0;
115 const G4double beta = dp->GetBeta(); << 131 G4double gam2 = gam*gam;
116 const G4double beta2 = beta*beta; << 132 G4double beta2 = tau*(tau + 2.0)/gam2;
117 133
118 G4double loss(0.), siga(0.); 134 G4double loss(0.), siga(0.);
119 135
120 const G4Material* material = couple->GetMate 136 const G4Material* material = couple->GetMaterial();
121 137
122 // Gaussian regime 138 // Gaussian regime
123 // for heavy particles only and conditions 139 // for heavy particles only and conditions
124 // for Gauusian fluct. has been changed 140 // for Gauusian fluct. has been changed
125 // 141 //
126 if (particleMass > CLHEP::electron_mass_c2 & << 142 if ((particleMass > electron_mass_c2) &&
127 meanLoss >= minNumberInteractionsBohr*tc << 143 (meanLoss >= minNumberInteractionsBohr*tmax))
>> 144 {
>> 145 G4double tmaxkine = 2.*electron_mass_c2*beta2*gam2/
>> 146 (1.+m_massrate*(2.*gam+m_massrate)) ;
>> 147 if (tmaxkine <= 2.*tmax)
>> 148 {
>> 149 electronDensity = material->GetElectronDensity();
>> 150 siga = sqrt((1.0/beta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
>> 151 * electronDensity * chargeSquare);
128 152
129 siga = std::sqrt((tmax/beta2 - 0.5*tcut)*C << 153 G4double sn = meanLoss/siga;
130 length*chargeSquare*mate <<
131 const G4double sn = meanLoss/siga; <<
132 154
133 // thick target case << 155 // thick target case
134 if (sn >= 2.0) { << 156 if (sn >= 2.0) {
135 157
136 const G4double twomeanLoss = meanLoss + << 158 G4double twomeanLoss = meanLoss + meanLoss;
137 do { << 159 do {
138 loss = G4RandGauss::shoot(rndmEngineF, meanL << 160 loss = G4RandGauss::shoot(rndmEngineF,meanLoss,siga);
139 // Loop checking, 03-Aug-2015, Vladimir Ivan << 161 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
140 } while (0.0 > loss || twomeanLoss < lo << 162 } while (0.0 > loss || twomeanLoss < loss);
141 163
142 // Gamma distribution << 164 // Gamma distribution
143 } else { << 165 } else {
144 166
145 const G4double neff = sn*sn; << 167 G4double neff = sn*sn;
146 loss = meanLoss*G4RandGamma::shoot(rndmE << 168 loss = meanLoss*G4RandGamma::shoot(rndmEngineF,neff,1.0)/neff;
>> 169 }
>> 170 //G4cout << "Gauss: " << loss << G4endl;
>> 171 return loss;
147 } 172 }
148 //G4cout << "Gauss: " << loss << G4endl; <<
149 return loss; <<
150 } 173 }
151 174
152 auto ioni = material->GetIonisation(); << 175 // Glandz regime : initialisation
153 e0 = ioni->GetEnergy0fluct(); << 176 //
>> 177 if (material != lastMaterial) {
>> 178 f1Fluct = material->GetIonisation()->GetF1fluct();
>> 179 f2Fluct = material->GetIonisation()->GetF2fluct();
>> 180 e1Fluct = material->GetIonisation()->GetEnergy1fluct();
>> 181 e2Fluct = material->GetIonisation()->GetEnergy2fluct();
>> 182 e1LogFluct = material->GetIonisation()->GetLogEnergy1fluct();
>> 183 e2LogFluct = material->GetIonisation()->GetLogEnergy2fluct();
>> 184 ipotFluct = material->GetIonisation()->GetMeanExcitationEnergy();
>> 185 ipotLogFluct = material->GetIonisation()->GetLogMeanExcEnergy();
>> 186 e0 = material->GetIonisation()->GetEnergy0fluct();
>> 187 esmall = 0.5*sqrt(e0*ipotFluct);
>> 188 lastMaterial = material;
>> 189 }
154 190
155 // very small step or low-density material 191 // very small step or low-density material
156 if(tcut <= e0) { return meanLoss; } << 192 if(tmax <= e0) { return meanLoss; }
157 <<
158 ipotFluct = ioni->GetMeanExcitationEnergy(); <<
159 ipotLogFluct = ioni->GetLogMeanExcEnergy(); <<
160 193
161 // width correction for small cuts 194 // width correction for small cuts
162 const G4double scaling = std::min(1.+0.5*CLH << 195 G4double scaling = std::min(1.+0.5*CLHEP::keV/tmax,1.50);
163 meanLoss /= scaling; 196 meanLoss /= scaling;
164 197
165 w2 = (tcut > ipotFluct) ? << 198 G4double a1(0.0), a2(0.0), a3(0.0);
166 G4Log(2.*CLHEP::electron_mass_c2*beta2*gam << 199
167 return SampleGlandz(rndmEngineF, material, t << 200 loss = 0.0;
168 } << 201
169 << 202 e1 = e1Fluct;
170 //....oooOO0OOooo........oooOO0OOooo........oo << 203 e2 = e2Fluct;
171 << 204
172 G4double << 205 if(tmax > ipotFluct) {
173 G4UniversalFluctuation::SampleGlandz(CLHEP::He << 206 G4double w2 = G4Log(2.*electron_mass_c2*beta2*gam2)-beta2;
174 const G4M << 207
175 const G4d << 208 if(w2 > ipotLogFluct) {
176 { << 209 if(w2 > e2LogFluct) {
177 G4double a1(0.0), a3(0.0); << 210 G4double C = meanLoss*(1.-rate)/(w2-ipotLogFluct);
178 G4double loss = 0.0; << 211 a1 = C*f1Fluct*(w2-e1LogFluct)/e1Fluct;
179 G4double e1 = ipotFluct; << 212 a2 = C*f2Fluct*(w2-e2LogFluct)/e2Fluct;
180 << 213 } else {
181 if(tcut > e1) { << 214 a1 = meanLoss*(1.-rate)/e1;
182 a1 = meanLoss*(1.-rate)/e1; << 215 }
183 if(a1 < a0) { << 216 if(a1 < a0) {
184 const G4double fwnow = 0.1+(fw-0.1)*std: << 217 G4double fwnow = 0.5+(fw-0.5)*sqrt(a1/a0);
185 a1 /= fwnow; << 218 a1 /= fwnow;
186 e1 *= fwnow; << 219 e1 *= fwnow;
187 } else { << 220 } else {
188 a1 /= fw; << 221 a1 /= fw;
189 e1 *= fw; << 222 e1 = fw*e1Fluct;
>> 223 }
190 } 224 }
191 } 225 }
192 226
193 const G4double w1 = tcut/e0; << 227 G4double w1 = tmax/e0;
194 a3 = rate*meanLoss*(tcut - e0)/(e0*tcut*G4Lo << 228 if(tmax > e0) {
195 if(a1 <= 0.) { a3 /= rate; } << 229 a3 = rate*meanLoss*(tmax-e0)/(e0*tmax*G4Log(w1));
196 << 230 if(a1+a2 <= 0.) {
>> 231 a3 /= rate;
>> 232 }
>> 233 }
197 //'nearly' Gaussian fluctuation if a1>nmaxCo 234 //'nearly' Gaussian fluctuation if a1>nmaxCont&&a2>nmaxCont&&a3>nmaxCont
198 G4double emean = 0.; 235 G4double emean = 0.;
199 G4double sig2e = 0.; 236 G4double sig2e = 0.;
200 237
201 // excitation of type 1 238 // excitation of type 1
202 if(a1 > 0.0) { AddExcitation(rndmEngineF, a1 239 if(a1 > 0.0) { AddExcitation(rndmEngineF, a1, e1, emean, loss, sig2e); }
203 240
>> 241 // excitation of type 2
>> 242 if(a2 > 0.0) { AddExcitation(rndmEngineF, a2, e2, emean, loss, sig2e); }
>> 243
204 if(sig2e > 0.0) { SampleGauss(rndmEngineF, e 244 if(sig2e > 0.0) { SampleGauss(rndmEngineF, emean, sig2e, loss); }
205 245
206 // ionisation 246 // ionisation
207 if(a3 > 0.) { 247 if(a3 > 0.) {
208 emean = 0.; 248 emean = 0.;
209 sig2e = 0.; 249 sig2e = 0.;
210 G4double p3 = a3; 250 G4double p3 = a3;
211 G4double alfa = 1.; 251 G4double alfa = 1.;
212 if(a3 > nmaxCont) { << 252 if(a3 > nmaxCont)
213 alfa = w1*(nmaxCont+a3)/(w1*nmaxCont+a3) << 253 {
214 const G4double alfa1 = alfa*G4Log(alfa) << 254 alfa = w1*(nmaxCont+a3)/(w1*nmaxCont+a3);
215 const G4double namean = a3*w1*(alfa-1.)/ << 255 G4double alfa1 = alfa*G4Log(alfa)/(alfa-1.);
216 emean += namean*e0*alfa1; << 256 G4double namean = a3*w1*(alfa-1.)/((w1-1.)*alfa);
217 sig2e += e0*e0*namean*(alfa-alfa1*alfa1) << 257 emean += namean*e0*alfa1;
218 p3 = a3 - namean; << 258 sig2e += e0*e0*namean*(alfa-alfa1*alfa1);
219 } << 259 p3 = a3-namean;
>> 260 }
220 261
221 const G4double w3 = alfa*e0; << 262 G4double w2 = alfa*e0;
222 if(tcut > w3) { << 263 if(tmax > w2) {
223 const G4double w = (tcut-w3)/tcut; << 264 G4double w = (tmax-w2)/tmax;
224 const G4int nnb = (G4int)G4Poisson(p3); << 265 G4int nnb = G4Poisson(p3);
225 if(nnb > 0) { 266 if(nnb > 0) {
226 if(nnb > sizearray) { 267 if(nnb > sizearray) {
227 sizearray = nnb; 268 sizearray = nnb;
228 delete [] rndmarray; 269 delete [] rndmarray;
229 rndmarray = new G4double[nnb]; 270 rndmarray = new G4double[nnb];
230 } 271 }
231 rndmEngineF->flatArray(nnb, rndmarray) 272 rndmEngineF->flatArray(nnb, rndmarray);
232 for (G4int k=0; k<nnb; ++k) { loss += << 273 for (G4int k=0; k<nnb; ++k) { loss += w2/(1.-w*rndmarray[k]); }
233 } 274 }
234 } 275 }
235 if(sig2e > 0.0) { SampleGauss(rndmEngineF, 276 if(sig2e > 0.0) { SampleGauss(rndmEngineF, emean, sig2e, loss); }
236 } 277 }
237 //G4cout << "### loss=" << loss << G4endl; << 278
>> 279 loss *= scaling;
>> 280
238 return loss; 281 return loss;
>> 282
239 } 283 }
240 284
241 //....oooOO0OOooo........oooOO0OOooo........oo 285 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
242 286
243 287
244 G4double G4UniversalFluctuation::Dispersion( 288 G4double G4UniversalFluctuation::Dispersion(
245 const G4Material* ma 289 const G4Material* material,
246 const G4DynamicParti 290 const G4DynamicParticle* dp,
247 const G4double tcut, << 291 G4double tmax,
248 const G4double tmax, << 292 G4double length)
249 const G4double lengt <<
250 { 293 {
251 if(dp->GetDefinition() != particle) { Initia 294 if(dp->GetDefinition() != particle) { InitialiseMe(dp->GetDefinition()); }
252 const G4double beta = dp->GetBeta(); << 295
253 return (tmax/(beta*beta) - 0.5*tcut) * CLHEP << 296 electronDensity = material->GetElectronDensity();
254 * material->GetElectronDensity() * chargeS << 297
>> 298 G4double gam = (dp->GetKineticEnergy())*m_Inv_particleMass + 1.0;
>> 299 G4double beta2 = 1.0 - 1.0/(gam*gam);
>> 300
>> 301 G4double siga = (1.0/beta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
>> 302 * electronDensity * chargeSquare;
>> 303
>> 304 return siga;
255 } 305 }
256 306
257 //....oooOO0OOooo........oooOO0OOooo........oo 307 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
258 308
259 void 309 void
260 G4UniversalFluctuation::SetParticleAndCharge(c 310 G4UniversalFluctuation::SetParticleAndCharge(const G4ParticleDefinition* part,
261 G 311 G4double q2)
262 { 312 {
263 if(part != particle) { 313 if(part != particle) {
264 particle = part; << 314 particle = part;
265 particleMass = part->GetPDGMass(); << 315 particleMass = part->GetPDGMass();
266 316
267 // Derived quantities 317 // Derived quantities
268 m_Inv_particleMass = 1.0 / particleMass; << 318 if( particleMass != 0.0 ){
269 m_massrate = CLHEP::electron_mass_c2 * m_I << 319 m_Inv_particleMass = 1.0 / particleMass;
>> 320 m_massrate = electron_mass_c2 * m_Inv_particleMass ;
>> 321 }else{
>> 322 m_Inv_particleMass = DBL_MAX;
>> 323 m_massrate = DBL_MAX;
>> 324 }
270 } 325 }
271 chargeSquare = q2; 326 chargeSquare = q2;
272 } 327 }
273 328
274 //....oooOO0OOooo........oooOO0OOooo........oo 329 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
275 330