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>> 26 // $Id: G4mplIonisationModel.cc,v 1.5 2007/11/13 18:36:29 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-01-patch-02 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class header file 31 // GEANT4 Class header file
30 // 32 //
31 // 33 //
32 // File name: G4mplIonisationModel 34 // File name: G4mplIonisationModel
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 06.09.2005 38 // Creation date: 06.09.2005
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 12.08.2007 Changing low energy approximatio 41 // 12.08.2007 Changing low energy approximation and extrapolation.
40 // Small bug fixing and refactoring 42 // Small bug fixing and refactoring (M. Vladymyrov)
41 // 13.11.2007 Use low-energy asymptotic from [ 43 // 13.11.2007 Use low-energy asymptotic from [3] (V.Ivanchenko)
42 // 44 //
43 // 45 //
44 // ------------------------------------------- 46 // -------------------------------------------------------------------
45 // References 47 // References
46 // [1] Steven P. Ahlen: Energy loss of relativ 48 // [1] Steven P. Ahlen: Energy loss of relativistic heavy ionizing particles,
47 // S.P. Ahlen, Rev. Mod. Phys 52(1980), p1 49 // S.P. Ahlen, Rev. Mod. Phys 52(1980), p121
48 // [2] K.A. Milton arXiv:hep-ex/0602040 50 // [2] K.A. Milton arXiv:hep-ex/0602040
49 // [3] S.P. Ahlen and K. Kinoshita, Phys. Rev. 51 // [3] S.P. Ahlen and K. Kinoshita, Phys. Rev. D26 (1982) 2347
50 52
51 53
52 //....oooOO0OOooo........oooOO0OOooo........oo 54 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
53 //....oooOO0OOooo........oooOO0OOooo........oo 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
54 56
55 #include "G4mplIonisationModel.hh" 57 #include "G4mplIonisationModel.hh"
56 #include "Randomize.hh" 58 #include "Randomize.hh"
57 #include "G4PhysicalConstants.hh" << 59 #include "G4LossTableManager.hh"
58 #include "G4SystemOfUnits.hh" <<
59 #include "G4ParticleChangeForLoss.hh" 60 #include "G4ParticleChangeForLoss.hh"
60 #include "G4ProductionCutsTable.hh" <<
61 #include "G4MaterialCutsCouple.hh" <<
62 #include "G4Log.hh" <<
63 #include "G4Pow.hh" <<
64 61
65 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
66 63
67 std::vector<G4double>* G4mplIonisationModel::d << 64 using namespace std;
68 65
69 G4mplIonisationModel::G4mplIonisationModel(G4d 66 G4mplIonisationModel::G4mplIonisationModel(G4double mCharge, const G4String& nam)
70 : G4VEmModel(nam),G4VEmFluctuationModel(nam) 67 : G4VEmModel(nam),G4VEmFluctuationModel(nam),
71 magCharge(mCharge), 68 magCharge(mCharge),
72 twoln10(G4Log(100.0)), << 69 twoln10(log(100.0)),
73 betalow(0.01), 70 betalow(0.01),
74 betalim(0.1), 71 betalim(0.1),
75 beta2lim(betalim*betalim), 72 beta2lim(betalim*betalim),
76 bg2lim(beta2lim*(1.0 + beta2lim)) 73 bg2lim(beta2lim*(1.0 + beta2lim))
77 { 74 {
78 nmpl = G4int(std::abs(magCharge) * 2 * CLHEP << 75 nmpl = G4int(abs(magCharge) * 2 * fine_structure_const + 0.5);
79 if(nmpl > 6) { nmpl = 6; } << 76 if(nmpl > 6) nmpl = 6;
80 else if(nmpl < 1) { nmpl = 1; } << 77 else if(nmpl < 1) nmpl = 1;
81 pi_hbarc2_over_mc2 = CLHEP::pi*CLHEP::hbarc* << 78 pi_hbarc2_over_mc2 = pi * hbarc * hbarc / electron_mass_c2;
82 chargeSquare = magCharge * magCharge; 79 chargeSquare = magCharge * magCharge;
83 dedxlim = 45.*nmpl*nmpl*CLHEP::GeV*CLHEP::cm << 80 dedxlim = 45.*nmpl*nmpl*GeV*cm2/g;
84 } 81 }
85 82
86 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
87 84
88 G4mplIonisationModel::~G4mplIonisationModel() 85 G4mplIonisationModel::~G4mplIonisationModel()
89 { << 86 {}
90 if(IsMaster()) { delete dedx0; } <<
91 } <<
92 87
93 //....oooOO0OOooo........oooOO0OOooo........oo 88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
94 89
95 void G4mplIonisationModel::SetParticle(const G << 90 void G4mplIonisationModel::Initialise(const G4ParticleDefinition* p,
>> 91 const G4DataVector&)
96 { 92 {
97 monopole = p; 93 monopole = p;
98 mass = monopole->GetPDGMass(); 94 mass = monopole->GetPDGMass();
99 G4double emin = <<
100 std::min(LowEnergyLimit(),0.1*mass*(1./std <<
101 G4double emax = <<
102 std::max(HighEnergyLimit(),10.*mass*(1./st <<
103 SetLowEnergyLimit(emin); <<
104 SetHighEnergyLimit(emax); <<
105 } <<
106 95
107 //....oooOO0OOooo........oooOO0OOooo........oo << 96 if(pParticleChange)
108 << 97 fParticleChange = reinterpret_cast<G4ParticleChangeForLoss*>(pParticleChange);
109 void G4mplIonisationModel::Initialise(const G4 << 98 else
110 const G4DataVector&) << 99 fParticleChange = new G4ParticleChangeForLoss();
111 { <<
112 if(nullptr == monopole) { SetParticle(p); } <<
113 if(nullptr == fParticleChange) { fParticleCh <<
114 if(IsMaster()) { <<
115 if(nullptr == dedx0) { dedx0 = new std::ve <<
116 G4ProductionCutsTable* theCoupleTable= <<
117 G4ProductionCutsTable::GetProductionCuts <<
118 G4int numOfCouples = (G4int)theCoupleTable <<
119 G4int n = (G4int)dedx0->size(); <<
120 if(n < numOfCouples) { dedx0->resize(numOf <<
121 <<
122 G4Pow* g4calc = G4Pow::GetInstance(); <<
123 <<
124 // initialise vector assuming low conducti <<
125 for(G4int i=0; i<numOfCouples; ++i) { <<
126 <<
127 const G4Material* material = <<
128 theCoupleTable->GetMaterialCutsCouple( <<
129 G4double eDensity = material->GetElectro <<
130 G4double vF2 = 2*electron_Compton_length <<
131 (*dedx0)[i] = pi_hbarc2_over_mc2*eDensit <<
132 (G4Log(vF2/fine_structure_const) - 0.5 <<
133 } <<
134 } <<
135 } 100 }
136 101
137 //....oooOO0OOooo........oooOO0OOooo........oo 102 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
138 103
139 G4double G4mplIonisationModel::ComputeDEDXPerV 104 G4double G4mplIonisationModel::ComputeDEDXPerVolume(const G4Material* material,
140 const G4ParticleDefinition* p, << 105 const G4ParticleDefinition*,
141 G4double kineticEnergy, 106 G4double kineticEnergy,
142 G4double) 107 G4double)
143 { 108 {
144 if(nullptr == monopole) { SetParticle(p); } <<
145 G4double tau = kineticEnergy / mass; 109 G4double tau = kineticEnergy / mass;
146 G4double gam = tau + 1.0; 110 G4double gam = tau + 1.0;
147 G4double bg2 = tau * (tau + 2.0); 111 G4double bg2 = tau * (tau + 2.0);
148 G4double beta2 = bg2 / (gam * gam); 112 G4double beta2 = bg2 / (gam * gam);
149 G4double beta = std::sqrt(beta2); << 113 G4double beta = sqrt(beta2);
150 114
151 // low-energy asymptotic formula 115 // low-energy asymptotic formula
152 //G4double dedx = dedxlim*beta*material->Ge << 116 G4double dedx = dedxlim*beta*material->GetDensity();
153 G4double dedx = (*dedx0)[CurrentCouple()->Ge <<
154 117
155 // above asymptotic 118 // above asymptotic
156 if(beta > betalow) { 119 if(beta > betalow) {
157 120
158 // high energy 121 // high energy
159 if(beta >= betalim) { 122 if(beta >= betalim) {
160 dedx = ComputeDEDXAhlen(material, bg2); 123 dedx = ComputeDEDXAhlen(material, bg2);
161 124
162 } else { 125 } else {
163 126
164 //G4double dedx1 = dedxlim*betalow*mater << 127 G4double dedx1 = dedxlim*betalow*material->GetDensity();
165 G4double dedx1 = (*dedx0)[CurrentCouple( <<
166 G4double dedx2 = ComputeDEDXAhlen(materi 128 G4double dedx2 = ComputeDEDXAhlen(material, bg2lim);
167 129
168 // extrapolation between two formula 130 // extrapolation between two formula
169 G4double kapa2 = beta - betalow; 131 G4double kapa2 = beta - betalow;
170 G4double kapa1 = betalim - beta; 132 G4double kapa1 = betalim - beta;
171 dedx = (kapa1*dedx1 + kapa2*dedx2)/(kapa 133 dedx = (kapa1*dedx1 + kapa2*dedx2)/(kapa1 + kapa2);
172 } 134 }
173 } 135 }
174 return dedx; 136 return dedx;
175 } 137 }
176 138
177 //....oooOO0OOooo........oooOO0OOooo........oo 139 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
178 140
179 G4double G4mplIonisationModel::ComputeDEDXAhle << 141 G4double G4mplIonisationModel::ComputeDEDXAhlen(const G4Material* material, G4double bg2)
180 G4double bg2) <<
181 { 142 {
182 G4double eDensity = material->GetElectronDen 143 G4double eDensity = material->GetElectronDensity();
183 G4double eexc = material->GetIonisation()-> 144 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
184 G4double cden = material->GetIonisation()-> 145 G4double cden = material->GetIonisation()->GetCdensity();
185 G4double mden = material->GetIonisation()-> 146 G4double mden = material->GetIonisation()->GetMdensity();
186 G4double aden = material->GetIonisation()-> 147 G4double aden = material->GetIonisation()->GetAdensity();
187 G4double x0den = material->GetIonisation()-> 148 G4double x0den = material->GetIonisation()->GetX0density();
188 G4double x1den = material->GetIonisation()-> 149 G4double x1den = material->GetIonisation()->GetX1density();
189 150
190 // Ahlen's formula for nonconductors, [1]p15 151 // Ahlen's formula for nonconductors, [1]p157, f(5.7)
191 G4double dedx = std::log(2.0 * electron_mass << 152 G4double dedx = log(2.0 * electron_mass_c2 * bg2 / eexc) - 0.5;
192 153
193 // Kazama et al. cross-section correction 154 // Kazama et al. cross-section correction
194 G4double k = 0.406; 155 G4double k = 0.406;
195 if(nmpl > 1) k = 0.346; 156 if(nmpl > 1) k = 0.346;
196 157
197 // Bloch correction 158 // Bloch correction
198 const G4double B[7] = { 0.0, 0.248, 0.672, 1 159 const G4double B[7] = { 0.0, 0.248, 0.672, 1.022, 1.243, 1.464, 1.685};
199 160
200 dedx += 0.5 * k - B[nmpl]; 161 dedx += 0.5 * k - B[nmpl];
201 162
202 // density effect correction 163 // density effect correction
203 G4double deltam; 164 G4double deltam;
204 G4double x = std::log(bg2) / twoln10; << 165 G4double x = log(bg2) / twoln10;
205 if ( x >= x0den ) { 166 if ( x >= x0den ) {
206 deltam = twoln10 * x - cden; 167 deltam = twoln10 * x - cden;
207 if ( x < x1den ) deltam += aden * std::pow << 168 if ( x < x1den ) deltam += aden * pow((x1den-x), mden);
208 dedx -= 0.5 * deltam; 169 dedx -= 0.5 * deltam;
209 } 170 }
210 171
211 // now compute the total ionization loss 172 // now compute the total ionization loss
212 dedx *= pi_hbarc2_over_mc2 * eDensity * nmp 173 dedx *= pi_hbarc2_over_mc2 * eDensity * nmpl * nmpl;
213 174
214 if (dedx < 0.0) dedx = 0.; << 175 if (dedx < 0.0) dedx = 0;
215 return dedx; 176 return dedx;
216 } 177 }
217 178
218 //....oooOO0OOooo........oooOO0OOooo........oo 179 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
219 180
220 void G4mplIonisationModel::SampleSecondaries(s <<
221 const G4MaterialCutsCouple*, <<
222 const G4DynamicParticle*, <<
223 G4double, <<
224 G4double) <<
225 {} <<
226 <<
227 //....oooOO0OOooo........oooOO0OOooo........oo <<
228 <<
229 G4double G4mplIonisationModel::SampleFluctuati 181 G4double G4mplIonisationModel::SampleFluctuations(
230 const G4MaterialCutsCouple* cou << 182 const G4Material* material,
231 const G4DynamicParticle* dp, 183 const G4DynamicParticle* dp,
232 const G << 184 G4double& tmax,
233 const G << 185 G4double& length,
234 const G4double length, << 186 G4double& meanLoss)
235 const G4double meanLoss) <<
236 { 187 {
237 G4double siga = Dispersion(couple->GetMateri << 188 G4double siga = Dispersion(material,dp,tmax,length);
238 G4double loss = meanLoss; 189 G4double loss = meanLoss;
239 siga = std::sqrt(siga); << 190 siga = sqrt(siga);
240 G4double twomeanLoss = meanLoss + meanLoss; 191 G4double twomeanLoss = meanLoss + meanLoss;
241 192
242 if(twomeanLoss < siga) { 193 if(twomeanLoss < siga) {
243 G4double x; 194 G4double x;
244 do { 195 do {
245 loss = twomeanLoss*G4UniformRand(); 196 loss = twomeanLoss*G4UniformRand();
246 x = (loss - meanLoss)/siga; 197 x = (loss - meanLoss)/siga;
247 // Loop checking, 07-Aug-2015, Vladimir <<
248 } while (1.0 - 0.5*x*x < G4UniformRand()); 198 } while (1.0 - 0.5*x*x < G4UniformRand());
249 } else { 199 } else {
250 do { 200 do {
251 loss = G4RandGauss::shoot(meanLoss,siga) 201 loss = G4RandGauss::shoot(meanLoss,siga);
252 // Loop checking, 07-Aug-2015, Vladimir <<
253 } while (0.0 > loss || loss > twomeanLoss) 202 } while (0.0 > loss || loss > twomeanLoss);
254 } 203 }
255 return loss; 204 return loss;
256 } 205 }
257 <<
258 //....oooOO0OOooo........oooOO0OOooo........oo <<
259 <<
260 G4double G4mplIonisationModel::Dispersion(cons <<
261 const G4DynamicParticle* dp, <<
262 const G4double tcut, <<
263 const G4double tmax, <<
264 const G4double length) <<
265 { <<
266 G4double siga = 0.0; <<
267 G4double tau = dp->GetKineticEnergy()/mass <<
268 if(tau > 0.0) { <<
269 const G4double beta = dp->GetBeta(); <<
270 siga = (tmax/(beta*beta) - 0.5*tcut) * tw <<
271 * material->GetElectronDensity() * charg <<
272 } <<
273 return siga; <<
274 } <<
275 <<
276 //....oooOO0OOooo........oooOO0OOooo........oo <<
277 206