source: trunk/source/processes/electromagnetic/standard/include/G4eBremsstrahlungRelModel.hh@ 1330

Last change on this file since 1330 was 1228, checked in by garnier, 16 years ago

update geant4.9.3 tag
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[966]1//
2// ********************************************************************
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14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
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18// * This code implementation is the result of the scientific and *
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20// * By using, copying, modifying or distributing the software (or *
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24// ********************************************************************
25//
[1055]26// $Id: G4eBremsstrahlungRelModel.hh,v 1.11 2009/02/20 12:06:37 vnivanch Exp $
[1228]27// GEANT4 tag $Name: geant4-09-03 $
[966]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
58class G4ParticleChangeForLoss;
59class G4PhysicsVector;
60
61class G4eBremsstrahlungRelModel : public G4VEmModel
62{
63
64public:
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
[1055]73 virtual G4double MinEnergyCut(const G4ParticleDefinition*,
74 const G4MaterialCutsCouple*);
[966]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
99private:
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
127protected:
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
160private:
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
178inline 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
205inline 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
212inline 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
219inline 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
226inline 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
234inline
235void G4eBremsstrahlungRelModel::SetLPMconstant(G4double val)
236{
237 fLPMconstant = val;
238}
239
240//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
241
242inline
243G4double G4eBremsstrahlungRelModel::LPMconstant() const
244{
245 return fLPMconstant;
246}
247
248//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
249
250
251#endif
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