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