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