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27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4IonChuFluctuationModel
33 //
34 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
35 //
36 // Creation date: 18 August 2000
37 //
38 // Modifications:
39 // 18/08/2000 V.Ivanchenko First implementation
40 // 04/09/2000 V.Ivanchenko Rename fluctuations
41 // 03/10/2000 V.Ivanchenko CodeWizard clean up
42 // 10/05/2001 V.Ivanchenko Clean up againist Linux compilation with -Wall
43 //
44 // -------------------------------------------------------------------
45 //
46 // Class Description:
47 //
48 // The aproximation of additional ion energy loss fluctuations
49 // W.K.Chu, In: Ion Beam Handbook for Material Analysis.
50 // eds. J.W. Mayer and E. Rimini (Academic Press, New York, 1977).
51 // Q.Yang et al., NIM B61(1991)149-155.
52 //
53 // Class Description: End
54 //
55 // -------------------------------------------------------------------
56 //
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
58
59 #include "G4IonChuFluctuationModel.hh"
60
61 #include "globals.hh"
62 #include "G4PhysicalConstants.hh"
63 #include "G4SystemOfUnits.hh"
64 #include "G4DynamicParticle.hh"
65 #include "G4ParticleDefinition.hh"
66 #include "G4Material.hh"
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
69
70 G4IonChuFluctuationModel::G4IonChuFluctuationModel(const G4String& name)
71 : G4VLowEnergyModel(name)
72 {;}
73
74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75
76 G4IonChuFluctuationModel::~G4IonChuFluctuationModel()
77 {;}
78
79 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
80
81 G4double G4IonChuFluctuationModel::TheValue(const G4DynamicParticle* particle,
82 const G4Material* material)
83 {
84 G4double energy = particle->GetKineticEnergy() ;
85 G4double particleMass = particle->GetMass() ;
86
87 G4double q = ChuFluctuationModel(material,energy,particleMass) ;
88
89 return q ;
90 }
91
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
93
94 G4double G4IonChuFluctuationModel::TheValue(
95 const G4ParticleDefinition* aParticle,
96 const G4Material* material,
97 G4double kineticEnergy)
98 {
99 G4double particleMass = aParticle->GetPDGMass() ;
100
101 G4double q = ChuFluctuationModel(material,kineticEnergy,particleMass);
102
103 return q ;
104 }
105
106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
107
108 G4double G4IonChuFluctuationModel::HighEnergyLimit(const G4ParticleDefinition*,
109 const G4Material* ) const
110 {
111 return 1.0*TeV ;
112 }
113
114 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
115
116 G4double G4IonChuFluctuationModel::LowEnergyLimit(const G4ParticleDefinition*,
117 const G4Material*) const
118 {
119 return 0.0 ;
120 }
121
122 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
123
124 G4double G4IonChuFluctuationModel::HighEnergyLimit(const G4ParticleDefinition*) const
125 {
126 return 1.0*TeV ;
127 }
128
129 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
130
131 G4double G4IonChuFluctuationModel::LowEnergyLimit(const G4ParticleDefinition*) const
132 {
133 return 0.0 ;
134 }
135
136 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
137
138 G4bool G4IonChuFluctuationModel::IsInCharge(const G4DynamicParticle*,
139 const G4Material*) const
140 {
141 return true ;
142 }
143
144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
145
146 G4bool G4IonChuFluctuationModel::IsInCharge(const G4ParticleDefinition*,
147 const G4Material*) const
148 {
149 return true ;
150 }
151
152 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
153
154 G4double G4IonChuFluctuationModel::ChuFluctuationModel(const G4Material* material,
155 G4double kineticEnergy,
156 G4double particleMass) const
157 {
158 // The aproximation of energy loss fluctuations
159 // Q.Yang et al., NIM B61(1991)149-155.
160
161 // Reduced energy in MeV/AMU
162 G4double energy = kineticEnergy * amu_c2/(particleMass*MeV) ;
163
164 G4double zeff = (material->GetElectronDensity())/
165 (material->GetTotNbOfAtomsPerVolume()) ;
166
167 static const G4double a[96][4] = {
168 {-0.3291, -0.8312, 0.2460, -1.0220},
169 {-0.5615, -0.5898, 0.5205, -0.7258},
170 {-0.5280, -0.4981, 0.5519, -0.5865},
171 {-0.5125, -0.4625, 0.5660, -0.5190},
172 {-0.5127, -0.8595, 0.5626, -0.8721},
173 {-0.5174, -1.1930, 0.5565, -1.1980},
174 {-0.5179, -1.1850, 0.5560, -1.2070},
175 {-0.5209, -0.9355, 0.5590, -1.0250},
176 {-0.5255, -0.7766, 0.5720, -0.9412},
177
178 {-0.5776, -0.6665, 0.6598, -0.8484},
179 {-0.6013, -0.6045, 0.7321, -0.7671},
180 {-0.5781, -0.5518, 0.7605, -0.6919},
181 {-0.5587, -0.4981, 0.7835, -0.6195},
182 {-0.5466, -0.4656, 0.7978, -0.5771},
183 {-0.5406, -0.4690, 0.8031, -0.5718},
184 {-0.5391, -0.5061, 0.8024, -0.5974},
185 {-0.5380, -0.6483, 0.7962, -0.6970},
186 {-0.5355, -0.7722, 0.7962, -0.7839},
187 {-0.5329, -0.7720, 0.7988, -0.7846},
188
189 {-0.5335, -0.7671, 0.7984, -0.7933},
190 {-0.5324, -0.7612, 0.7998, -0.8031},
191 {-0.5305, -0.7300, 0.8031, -0.7990},
192 {-0.5307, -0.7178, 0.8049, -0.8216},
193 {-0.5248, -0.6621, 0.8165, -0.7919},
194 {-0.5180, -0.6502, 0.8266, -0.7986},
195 {-0.5084, -0.6408, 0.8396, -0.8048},
196 {-0.4967, -0.6331, 0.8549, -0.8093},
197 {-0.4861, -0.6508, 0.8712, -0.8432},
198 {-0.4700, -0.6186, 0.8961, -0.8132},
199
200 {-0.4545, -0.5720, 0.9227, -0.7710},
201 {-0.4404, -0.5226, 0.9481, -0.7254},
202 {-0.4288, -0.4778, 0.9701, -0.6850},
203 {-0.4199, -0.4425, 0.9874, -0.6539},
204 {-0.4131, -0.4188, 0.9998, -0.6332},
205 {-0.4089, -0.4057, 1.0070, -0.6218},
206 {-0.4039, -0.3913, 1.0150, -0.6107},
207 {-0.3987, -0.3698, 1.0240, -0.5938},
208 {-0.3977, -0.3608, 1.0260, -0.5852},
209 {-0.3972, -0.3600, 1.0260, -0.5842},
210
211 {-0.3985, -0.3803, 1.0200, -0.6013},
212 {-0.3985, -0.3979, 1.0150, -0.6168},
213 {-0.3968, -0.3990, 1.0160, -0.6195},
214 {-0.3971, -0.4432, 1.0050, -0.6591},
215 {-0.3944, -0.4665, 1.0010, -0.6825},
216 {-0.3924, -0.5109, 0.9921, -0.7235},
217 {-0.3882, -0.5158, 0.9947, -0.7343},
218 {-0.3838, -0.5125, 0.9999, -0.7370},
219 {-0.3786, -0.4976, 1.0090, -0.7310},
220 {-0.3741, -0.4738, 1.0200, -0.7155},
221
222 {-0.3969, -0.4496, 1.0320, -0.6982},
223 {-0.3663, -0.4297, 1.0430, -0.6828},
224 {-0.3630, -0.4120, 1.0530, -0.6689},
225 {-0.3597, -0.3964, 1.0620, -0.6564},
226 {-0.3555, -0.3809, 1.0720, -0.6454},
227 {-0.3525, -0.3607, 1.0820, -0.6289},
228 {-0.3505, -0.3465, 1.0900, -0.6171},
229 {-0.3397, -0.3570, 1.1020, -0.6384},
230 {-0.3314, -0.3552, 1.1130, -0.6441},
231 {-0.3235, -0.3531, 1.1230, -0.6498},
232
233 {-0.3150, -0.3483, 1.1360, -0.6539},
234 {-0.3060, -0.3441, 1.1490, -0.6593},
235 {-0.2968, -0.3396, 1.1630, -0.6649},
236 {-0.2935, -0.3225, 1.1760, -0.6527},
237 {-0.2797, -0.3262, 1.1940, -0.6722},
238 {-0.2704, -0.3202, 1.2100, -0.6770},
239 {-0.2815, -0.3227, 1.2480, -0.6775},
240 {-0.2880, -0.3245, 1.2810, -0.6801},
241 {-0.3034, -0.3263, 1.3270, -0.6778},
242 {-0.2936, -0.3215, 1.3430, -0.6835},
243
244 {-0.3282, -0.3200, 1.3980, -0.6650},
245 {-0.3260, -0.3070, 1.4090, -0.6552},
246 {-0.3511, -0.3074, 1.4470, -0.6442},
247 {-0.3501, -0.3064, 1.4500, -0.6442},
248 {-0.3490, -0.3027, 1.4550, -0.6418},
249 {-0.3487, -0.3048, 1.4570, -0.6447},
250 {-0.3478, -0.3074, 1.4600, -0.6483},
251 {-0.3501, -0.3283, 1.4540, -0.6669},
252 {-0.3494, -0.3373, 1.4550, -0.6765},
253 {-0.3485, -0.3373, 1.4570, -0.6774},
254
255 {-0.3462, -0.3300, 1.4630, -0.6728},
256 {-0.3462, -0.3225, 1.4690, -0.6662},
257 {-0.3453, -0.3094, 1.4790, -0.6553},
258 {-0.3844, -0.3134, 1.5240, -0.6412},
259 {-0.3848, -0.3018, 1.5310, -0.6303},
260 {-0.3862, -0.2955, 1.5360, -0.6237},
261 {-0.4262, -0.2991, 1.5860, -0.6115},
262 {-0.4278, -0.2910, 1.5900, -0.6029},
263 {-0.4303, -0.2817, 1.5940, -0.5927},
264 {-0.4315, -0.2719, 1.6010, -0.5829},
265
266 {-0.4359, -0.2914, 1.6050, -0.6010},
267 {-0.4365, -0.2982, 1.6080, -0.6080},
268 {-0.4253, -0.3037, 1.6120, -0.6150},
269 {-0.4335, -0.3245, 1.6160, -0.6377},
270 {-0.4307, -0.3292, 1.6210, -0.6447},
271 {-0.4284, -0.3204, 1.6290, -0.6380},
272 {-0.4227, -0.3217, 1.6360, -0.6438}
273 } ;
274
275 G4int iz = (G4int)zeff - 2 ;
276 if( 0 > iz ) iz = 0 ;
277 if(95 < iz ) iz = 95 ;
278
279 G4double q = 1.0 / (1.0 + a[iz][0]*std::pow(energy,a[iz][1])+
280 + a[iz][2]*std::pow(energy,a[iz][3])) ;
281
282 return q ;
283 }
284
285
286