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