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25 // 22 //
26 // 23 //
27 // ------------------------------------------- 24 // -------------------------------------------------------------------
28 // 25 //
29 // GEANT4 Class file 26 // GEANT4 Class file
30 // 27 //
31 // 28 //
32 // File name: G4hBetheBlochModel 29 // File name: G4hBetheBlochModel
33 // 30 //
34 // Author: V.Ivanchenko (Vladimir.Ivanc 31 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
35 // 32 //
36 // Creation date: 20 July 2000 33 // Creation date: 20 July 2000
37 // 34 //
38 // Modifications: 35 // Modifications:
39 // 20/07/2000 V.Ivanchenko First implementati 36 // 20/07/2000 V.Ivanchenko First implementation
40 // 03/10/2000 V.Ivanchenko clean up accoding 37 // 03/10/2000 V.Ivanchenko clean up accoding to CodeWizard
41 // 38 //
42 // Class Description: 39 // Class Description:
43 // 40 //
44 // Bethe-Bloch ionisation model 41 // Bethe-Bloch ionisation model
45 // 42 //
46 // Class Description: End 43 // Class Description: End
47 // 44 //
48 // ------------------------------------------- 45 // -------------------------------------------------------------------
49 // 46 //
50 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
51 48
52 #include "G4hBetheBlochModel.hh" 49 #include "G4hBetheBlochModel.hh"
53 <<
54 #include "globals.hh" <<
55 #include "G4PhysicalConstants.hh" <<
56 #include "G4SystemOfUnits.hh" <<
57 #include "G4DynamicParticle.hh" 50 #include "G4DynamicParticle.hh"
58 #include "G4ParticleDefinition.hh" 51 #include "G4ParticleDefinition.hh"
59 #include "G4Material.hh" 52 #include "G4Material.hh"
>> 53 #include "globals.hh"
60 54
61 //....oooOO0OOooo........oooOO0OOooo........oo 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
62 56
63 G4hBetheBlochModel::G4hBetheBlochModel(const G 57 G4hBetheBlochModel::G4hBetheBlochModel(const G4String& name)
64 : G4VLowEnergyModel(name), << 58 : G4VLowEnergyModel(name),
65 twoln10(2.*std::log(10.)), << 59 twoln10(2.*log(10.)),
66 bg2lim(0.0169), 60 bg2lim(0.0169),
67 taulim(8.4146e-3), << 61 taulim(8.4146e-3)
68 lowEnergyLimit(1.*MeV), <<
69 highEnergyLimit(100.*GeV) <<
70 {;} 62 {;}
71 63
72 //....oooOO0OOooo........oooOO0OOooo........oo 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
73 65
74 G4hBetheBlochModel::~G4hBetheBlochModel() 66 G4hBetheBlochModel::~G4hBetheBlochModel()
75 {;} 67 {;}
76 68
77 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78 70
79 G4double G4hBetheBlochModel::TheValue(const G4 71 G4double G4hBetheBlochModel::TheValue(const G4DynamicParticle* particle,
80 const G4Materi 72 const G4Material* material)
81 { 73 {
82 G4double energy = particle->GetKineticEnergy 74 G4double energy = particle->GetKineticEnergy() ;
83 G4double particleMass = particle->GetMass() 75 G4double particleMass = particle->GetMass() ;
84 76
85 G4double eloss = BetheBlochFormula(material 77 G4double eloss = BetheBlochFormula(material,energy,particleMass) ;
86 78
87 return eloss ; 79 return eloss ;
88 } 80 }
89 81
90 //....oooOO0OOooo........oooOO0OOooo........oo 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
91 83
92 G4double G4hBetheBlochModel::TheValue(const G4 84 G4double G4hBetheBlochModel::TheValue(const G4ParticleDefinition* aParticle,
93 const G4Materi 85 const G4Material* material,
94 G4double kineticEnergy) << 86 G4double kineticEnergy)
95 { 87 {
96 G4double particleMass = aParticle->GetPDGMas 88 G4double particleMass = aParticle->GetPDGMass() ;
97 G4double eloss = BetheBlochFormula(material 89 G4double eloss = BetheBlochFormula(material,kineticEnergy,particleMass) ;
98 90
99 return eloss ; 91 return eloss ;
100 } 92 }
101 93
102 //....oooOO0OOooo........oooOO0OOooo........oo 94 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
103 95
104 G4double G4hBetheBlochModel::HighEnergyLimit( 96 G4double G4hBetheBlochModel::HighEnergyLimit(
105 const G4ParticleD << 97 const G4ParticleDefinition* aParticle,
106 const G4Material* << 98 const G4Material* material) const
107 { 99 {
108 return highEnergyLimit ; 100 return highEnergyLimit ;
109 } 101 }
110 102
111 //....oooOO0OOooo........oooOO0OOooo........oo 103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
112 104
113 G4double G4hBetheBlochModel::LowEnergyLimit( 105 G4double G4hBetheBlochModel::LowEnergyLimit(
114 const G4ParticleD 106 const G4ParticleDefinition* aParticle,
115 const G4Material* 107 const G4Material* material) const
116 { 108 {
117 G4double taul = (material->GetIonisation()-> 109 G4double taul = (material->GetIonisation()->GetTaul())*
118 (aParticle->GetPDGMass()) ; 110 (aParticle->GetPDGMass()) ;
119 return taul ; 111 return taul ;
120 } 112 }
121 113
122 //....oooOO0OOooo........oooOO0OOooo........oo 114 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
123 115
124 G4double G4hBetheBlochModel::HighEnergyLimit( 116 G4double G4hBetheBlochModel::HighEnergyLimit(
125 const G4ParticleD << 117 const G4ParticleDefinition* aParticle) const
126 { 118 {
127 return highEnergyLimit ; 119 return highEnergyLimit ;
128 } 120 }
129 121
130 //....oooOO0OOooo........oooOO0OOooo........oo 122 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
131 123
132 G4double G4hBetheBlochModel::LowEnergyLimit( 124 G4double G4hBetheBlochModel::LowEnergyLimit(
133 const G4ParticleD << 125 const G4ParticleDefinition* aParticle) const
134 { 126 {
135 return lowEnergyLimit ; 127 return lowEnergyLimit ;
136 } 128 }
137 129
138 //....oooOO0OOooo........oooOO0OOooo........oo 130 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
139 131
140 G4bool G4hBetheBlochModel::IsInCharge(const G4 << 132 G4bool G4hBetheBlochModel::IsInCharge(const G4DynamicParticle* particle,
141 const G4Material* ) << 133 const G4Material* material) const
142 { 134 {
143 return true ; 135 return true ;
144 } 136 }
145 137
146 //....oooOO0OOooo........oooOO0OOooo........oo 138 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
147 139
148 G4bool G4hBetheBlochModel::IsInCharge(const G4 << 140 G4bool G4hBetheBlochModel::IsInCharge(const G4ParticleDefinition* aParticle,
149 const G4Material* ) << 141 const G4Material* material) const
150 { 142 {
151 return true ; 143 return true ;
152 } 144 }
153 145
154 //....oooOO0OOooo........oooOO0OOooo........oo 146 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
155 147
156 G4double G4hBetheBlochModel::BetheBlochFormula 148 G4double G4hBetheBlochModel::BetheBlochFormula(
157 const G4Material* 149 const G4Material* material,
158 G4double ki 150 G4double kineticEnergy,
159 G4double pa 151 G4double particleMass) const
160 { 152 {
161 // This member function is applied normally 153 // This member function is applied normally to proton/antiproton
162 G4double ionloss ; 154 G4double ionloss ;
163 155
164 G4double rateMass = electron_mass_c2/particl 156 G4double rateMass = electron_mass_c2/particleMass ;
165 157
166 G4double taul = material->GetIonisation()->G 158 G4double taul = material->GetIonisation()->GetTaul() ;
167 G4double tau = kineticEnergy/particleMass ; 159 G4double tau = kineticEnergy/particleMass ; // tau is relative energy
168 160
169 // It is not normal case for this function 161 // It is not normal case for this function
170 // for low energy parametrisation have to be 162 // for low energy parametrisation have to be applied
171 if ( tau < taul ) tau = taul ; 163 if ( tau < taul ) tau = taul ;
172 164
173 // some local variables 165 // some local variables
174 166
175 G4double gamma,bg2,beta2,tmax,x,delta,sh ; 167 G4double gamma,bg2,beta2,tmax,x,delta,sh ;
176 G4double electronDensity = material->GetElec 168 G4double electronDensity = material->GetElectronDensity();
177 G4double eexc = material->GetIonisation()-> 169 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
178 G4double eexc2 = eexc*eexc ; 170 G4double eexc2 = eexc*eexc ;
179 G4double cden = material->GetIonisation()-> 171 G4double cden = material->GetIonisation()->GetCdensity();
180 G4double mden = material->GetIonisation()-> 172 G4double mden = material->GetIonisation()->GetMdensity();
181 G4double aden = material->GetIonisation()-> 173 G4double aden = material->GetIonisation()->GetAdensity();
182 G4double x0den = material->GetIonisation()-> 174 G4double x0den = material->GetIonisation()->GetX0density();
183 G4double x1den = material->GetIonisation()-> 175 G4double x1den = material->GetIonisation()->GetX1density();
184 G4double* shellCorrectionVector = 176 G4double* shellCorrectionVector =
185 material->GetIonisation()->GetShel 177 material->GetIonisation()->GetShellCorrectionVector();
186 178
187 gamma = tau + 1.0 ; 179 gamma = tau + 1.0 ;
188 bg2 = tau*(tau+2.0) ; 180 bg2 = tau*(tau+2.0) ;
189 beta2 = bg2/(gamma*gamma) ; 181 beta2 = bg2/(gamma*gamma) ;
190 tmax = 2.*electron_mass_c2*bg2/(1.+2.*gamma* 182 tmax = 2.*electron_mass_c2*bg2/(1.+2.*gamma*rateMass+rateMass*rateMass) ;
191 183
192 ionloss = std::log(2.0*electron_mass_c2*bg2* << 184 ionloss = log(2.0*electron_mass_c2*bg2*tmax/eexc2)-2.0*beta2 ;
193 185
194 // density correction 186 // density correction
195 x = std::log(bg2)/twoln10 ; << 187 x = log(bg2)/twoln10 ;
196 if ( x < x0den ) { 188 if ( x < x0den ) {
197 delta = 0.0 ; 189 delta = 0.0 ;
198 190
199 } else { 191 } else {
200 delta = twoln10*x - cden ; 192 delta = twoln10*x - cden ;
201 if ( x < x1den ) delta += aden*std::pow((x << 193 if ( x < x1den ) delta += aden*pow((x1den-x),mden) ;
202 } 194 }
203 195
204 // shell correction 196 // shell correction
205 sh = 0.0 ; 197 sh = 0.0 ;
206 x = 1.0 ; 198 x = 1.0 ;
207 199
208 if ( bg2 > bg2lim ) { 200 if ( bg2 > bg2lim ) {
209 for (G4int k=0; k<=2; k++) { 201 for (G4int k=0; k<=2; k++) {
210 x *= bg2 ; 202 x *= bg2 ;
211 sh += shellCorrectionVector[k]/x; 203 sh += shellCorrectionVector[k]/x;
212 } 204 }
213 205
214 } else { 206 } else {
215 for (G4int k=0; k<=2; k++) { 207 for (G4int k=0; k<=2; k++) {
216 x *= bg2lim ; 208 x *= bg2lim ;
217 sh += shellCorrectionVector[k]/x; 209 sh += shellCorrectionVector[k]/x;
218 } 210 }
219 sh *= std::log(tau/taul)/std::log(taulim/t << 211 sh *= log(tau/taul)/log(taulim/taul) ;
220 } 212 }
221 213
222 // now compute the total ionization loss 214 // now compute the total ionization loss
223 215
224 ionloss -= delta + sh ; 216 ionloss -= delta + sh ;
225 ionloss *= twopi_mc2_rcl2*electronDensity/be 217 ionloss *= twopi_mc2_rcl2*electronDensity/beta2 ;
226 218
227 if ( ionloss < 0.0) ionloss = 0.0 ; 219 if ( ionloss < 0.0) ionloss = 0.0 ;
228 220
229 return ionloss; 221 return ionloss;
230 } 222 }
231 223
232 224
233 225