1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4eBremsstrahlungRelModel.hh,v 1.11 2009/02/20 12:06:37 vnivanch Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
---|
28 | // |
---|
29 | // ------------------------------------------------------------------- |
---|
30 | // |
---|
31 | // GEANT4 Class header file |
---|
32 | // |
---|
33 | // |
---|
34 | // File name: G4eBremsstrahlungRelModel |
---|
35 | // extention of standard G4eBremsstrahlungModel |
---|
36 | // |
---|
37 | // Author: Andreas Schaelicke |
---|
38 | // |
---|
39 | // Creation date: 28.03.2008 |
---|
40 | // |
---|
41 | // Modifications: |
---|
42 | // |
---|
43 | // |
---|
44 | // Class Description: |
---|
45 | // |
---|
46 | // Implementation of energy loss for gamma emission by electrons and |
---|
47 | // positrons including an improved version of the LPM effect |
---|
48 | |
---|
49 | // ------------------------------------------------------------------- |
---|
50 | // |
---|
51 | |
---|
52 | #ifndef G4eBremsstrahlungRelModel_h |
---|
53 | #define G4eBremsstrahlungRelModel_h 1 |
---|
54 | |
---|
55 | #include "G4VEmModel.hh" |
---|
56 | #include "G4NistManager.hh" |
---|
57 | |
---|
58 | class G4ParticleChangeForLoss; |
---|
59 | class G4PhysicsVector; |
---|
60 | |
---|
61 | class G4eBremsstrahlungRelModel : public G4VEmModel |
---|
62 | { |
---|
63 | |
---|
64 | public: |
---|
65 | |
---|
66 | G4eBremsstrahlungRelModel(const G4ParticleDefinition* p = 0, |
---|
67 | const G4String& nam = "eBremRel"); |
---|
68 | |
---|
69 | virtual ~G4eBremsstrahlungRelModel(); |
---|
70 | |
---|
71 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
---|
72 | |
---|
73 | virtual G4double MinEnergyCut(const G4ParticleDefinition*, |
---|
74 | const G4MaterialCutsCouple*); |
---|
75 | |
---|
76 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
---|
77 | const G4ParticleDefinition*, |
---|
78 | G4double kineticEnergy, |
---|
79 | G4double cutEnergy); |
---|
80 | |
---|
81 | virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
---|
82 | G4double tkin, |
---|
83 | G4double Z, G4double, |
---|
84 | G4double cutEnergy, |
---|
85 | G4double maxEnergy = DBL_MAX); |
---|
86 | |
---|
87 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
---|
88 | const G4MaterialCutsCouple*, |
---|
89 | const G4DynamicParticle*, |
---|
90 | G4double cutEnergy, |
---|
91 | G4double maxEnergy); |
---|
92 | |
---|
93 | virtual void SetupForMaterial(const G4ParticleDefinition*, |
---|
94 | const G4Material*,G4double); |
---|
95 | |
---|
96 | inline void SetLPMconstant(G4double val); |
---|
97 | inline G4double LPMconstant() const; |
---|
98 | |
---|
99 | private: |
---|
100 | |
---|
101 | void InitialiseConstants(); |
---|
102 | |
---|
103 | void CalcLPMFunctions(G4double gammaEnergy); |
---|
104 | |
---|
105 | G4double ComputeBremLoss(G4double cutEnergy); |
---|
106 | |
---|
107 | G4double ComputeXSectionPerAtom(G4double cutEnergy); |
---|
108 | |
---|
109 | G4double ComputeDXSectionPerAtom(G4double gammaEnergy); |
---|
110 | |
---|
111 | G4double ComputeRelDXSectionPerAtom(G4double gammaEnergy); |
---|
112 | |
---|
113 | void SetParticle(const G4ParticleDefinition* p); |
---|
114 | |
---|
115 | // * fast inline functions * |
---|
116 | inline void SetCurrentElement(const G4double); |
---|
117 | |
---|
118 | inline G4double Phi1(G4double,G4double); |
---|
119 | inline G4double Phi1M2(G4double,G4double); |
---|
120 | inline G4double Psi1(G4double,G4double); |
---|
121 | inline G4double Psi1M2(G4double,G4double); |
---|
122 | |
---|
123 | // hide assignment operator |
---|
124 | G4eBremsstrahlungRelModel & operator=(const G4eBremsstrahlungRelModel &right); |
---|
125 | G4eBremsstrahlungRelModel(const G4eBremsstrahlungRelModel&); |
---|
126 | |
---|
127 | protected: |
---|
128 | |
---|
129 | G4NistManager* nist; |
---|
130 | const G4ParticleDefinition* particle; |
---|
131 | G4ParticleDefinition* theGamma; |
---|
132 | G4ParticleChangeForLoss* fParticleChange; |
---|
133 | |
---|
134 | static const G4double xgi[8], wgi[8]; |
---|
135 | static const G4double Fel_light[5]; |
---|
136 | static const G4double Finel_light[5]; |
---|
137 | |
---|
138 | G4double minThreshold; |
---|
139 | |
---|
140 | // cash |
---|
141 | G4double particleMass; |
---|
142 | G4double kinEnergy; |
---|
143 | G4double totalEnergy; |
---|
144 | G4double currentZ; |
---|
145 | G4double z13, z23, lnZ; |
---|
146 | G4double Fel, Finel, fCoulomb, fMax; |
---|
147 | G4double densityFactor; |
---|
148 | G4double densityCorr; |
---|
149 | |
---|
150 | // LPM effect |
---|
151 | G4double lpmEnergy; |
---|
152 | G4PhysicsVector *fXiLPM, *fPhiLPM, *fGLPM; |
---|
153 | G4double xiLPM, phiLPM, gLPM; |
---|
154 | |
---|
155 | // critical gamma energies |
---|
156 | G4double klpm, kp; |
---|
157 | |
---|
158 | G4bool isElectron; |
---|
159 | |
---|
160 | private: |
---|
161 | // consts |
---|
162 | G4double highKinEnergy; |
---|
163 | G4double lowKinEnergy; |
---|
164 | G4double fMigdalConstant; |
---|
165 | G4double fLPMconstant; |
---|
166 | G4double bremFactor; |
---|
167 | G4double energyThresholdLPM; |
---|
168 | G4double facFel, facFinel; |
---|
169 | G4double preS1,logTwo; |
---|
170 | |
---|
171 | G4bool use_completescreening; |
---|
172 | |
---|
173 | G4bool isInitialised; |
---|
174 | }; |
---|
175 | |
---|
176 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
177 | |
---|
178 | inline void G4eBremsstrahlungRelModel::SetCurrentElement(const G4double Z) |
---|
179 | { |
---|
180 | if(Z != currentZ) { |
---|
181 | currentZ = Z; |
---|
182 | |
---|
183 | G4int iz = G4int(Z); |
---|
184 | z13 = nist->GetZ13(iz); |
---|
185 | z23 = z13*z13; |
---|
186 | lnZ = nist->GetLOGZ(iz); |
---|
187 | |
---|
188 | if (iz <= 4) { |
---|
189 | Fel = Fel_light[iz]; |
---|
190 | Finel = Finel_light[iz] ; |
---|
191 | } |
---|
192 | else { |
---|
193 | Fel = facFel - lnZ/3. ; |
---|
194 | Finel = facFinel - 2.*lnZ/3. ; |
---|
195 | } |
---|
196 | |
---|
197 | fCoulomb=GetCurrentElement()->GetfCoulomb(); |
---|
198 | fMax = Fel-fCoulomb + Finel/currentZ + (1.+1./currentZ)/12.; |
---|
199 | } |
---|
200 | } |
---|
201 | |
---|
202 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
203 | |
---|
204 | |
---|
205 | inline G4double G4eBremsstrahlungRelModel::Phi1(G4double gg, G4double) |
---|
206 | { |
---|
207 | // Thomas-Fermi FF from Tsai, eq.(3.38) for Z>=5 |
---|
208 | return 20.863 - 2.*std::log(1. + sqr(0.55846*gg) ) |
---|
209 | - 4.*( 1. - 0.6*std::exp(-0.9*gg) - 0.4*std::exp(-1.5*gg) ); |
---|
210 | } |
---|
211 | |
---|
212 | inline G4double G4eBremsstrahlungRelModel::Phi1M2(G4double gg, G4double) |
---|
213 | { |
---|
214 | // Thomas-Fermi FF from Tsai, eq. (3.39) for Z>=5 |
---|
215 | // return Phi1(gg,Z) - |
---|
216 | return 2./(3.*(1. + 6.5*gg +6.*gg*gg) ); |
---|
217 | } |
---|
218 | |
---|
219 | inline G4double G4eBremsstrahlungRelModel::Psi1(G4double eps, G4double) |
---|
220 | { |
---|
221 | // Thomas-Fermi FF from Tsai, eq.(3.40) for Z>=5 |
---|
222 | return 28.340 - 2.*std::log(1. + sqr(3.621*eps) ) |
---|
223 | - 4.*( 1. - 0.7*std::exp(-8*eps) - 0.3*std::exp(-29.*eps) ); |
---|
224 | } |
---|
225 | |
---|
226 | inline G4double G4eBremsstrahlungRelModel::Psi1M2(G4double eps, G4double) |
---|
227 | { |
---|
228 | // Thomas-Fermi FF from Tsai, eq. (3.41) for Z>=5 |
---|
229 | return 2./(3.*(1. + 40.*eps +400.*eps*eps) ); |
---|
230 | } |
---|
231 | |
---|
232 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
233 | |
---|
234 | inline |
---|
235 | void G4eBremsstrahlungRelModel::SetLPMconstant(G4double val) |
---|
236 | { |
---|
237 | fLPMconstant = val; |
---|
238 | } |
---|
239 | |
---|
240 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
241 | |
---|
242 | inline |
---|
243 | G4double G4eBremsstrahlungRelModel::LPMconstant() const |
---|
244 | { |
---|
245 | return fLPMconstant; |
---|
246 | } |
---|
247 | |
---|
248 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
249 | |
---|
250 | |
---|
251 | #endif |
---|