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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4eBremParametrizedModel
33 // extention of standard G4eBremsstrahlungModel
34 //
35 // Author: Andreas Schaelicke
36 //
37 // Creation date: 28.03.2008
38 //
39 // Modifications:
40 //
41 //
42 // Class Description:
43 //
44 // Implementation of energy loss for gamma emission by electrons and
45 // positrons including an improved version of the LPM effect
46
47 // -------------------------------------------------------------------
48 //
49
50 #ifndef G4eBremParametrizedModel_h
51 #define G4eBremParametrizedModel_h 1
52
53 #include "G4VEmModel.hh"
54 #include "G4NistManager.hh"
55
56 class G4ParticleChangeForLoss;
57 class G4PhysicsVector;
58
59 class G4eBremParametrizedModel : public G4VEmModel
60 {
61
62 public:
63
64 explicit G4eBremParametrizedModel(const G4ParticleDefinition* p = nullptr,
65 const G4String& nam = "eBremParam");
66
67 ~G4eBremParametrizedModel() override;
68
69 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
70
71 void InitialiseLocal(const G4ParticleDefinition*,
72 G4VEmModel* masterModel) override;
73
74 G4double MinEnergyCut(const G4ParticleDefinition*,
75 const G4MaterialCutsCouple*) override;
76
77 G4double ComputeDEDXPerVolume(const G4Material*,
78 const G4ParticleDefinition*,
79 G4double kineticEnergy,
80 G4double cutEnergy) override;
81
82 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
83 G4double tkin,
84 G4double Z, G4double,
85 G4double cutEnergy,
86 G4double maxEnergy = DBL_MAX) override;
87
88 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
89 const G4MaterialCutsCouple*,
90 const G4DynamicParticle*,
91 G4double cutEnergy,
92 G4double maxEnergy) override;
93
94 void SetupForMaterial(const G4ParticleDefinition*,
95 const G4Material*,G4double) override;
96
97 // hide assignment operator
98 G4eBremParametrizedModel & operator=(const G4eBremParametrizedModel &right) = delete;
99 G4eBremParametrizedModel(const G4eBremParametrizedModel&) = delete;
100
101 private:
102
103 void InitialiseConstants();
104
105 G4double ComputeBremLoss(G4double cutEnergy);
106
107 G4double ComputeXSectionPerAtom(G4double cutEnergy);
108
109 G4double ComputeDXSectionPerAtom(G4double gammaEnergy);
110
111 G4double ComputeParametrizedDXSectionPerAtom(G4double kineticEnergy,
112 G4double gammaEnergy,
113 G4double Z);
114
115 void SetParticle(const G4ParticleDefinition* p);
116
117 G4double ScreenFunction1(G4double ScreenVariable);
118
119 G4double ScreenFunction2(G4double ScreenVariable);
120
121 inline void SetCurrentElement(const G4double);
122
123 protected:
124
125 G4NistManager* nist;
126 const G4ParticleDefinition* particle;
127 G4ParticleDefinition* theGamma;
128 G4ParticleChangeForLoss* fParticleChange;
129
130 static const G4double xgi[8], wgi[8];
131
132 G4double minThreshold;
133
134 // cash
135 G4double particleMass;
136 G4double kinEnergy;
137 G4double totalEnergy;
138 G4double currentZ;
139 G4double z13, z23, lnZ;
140 G4double densityFactor;
141 G4double densityCorr;
142 G4double Fel, Finel;
143 G4double facFel, facFinel;
144 G4double fMax,fCoulomb;
145
146 private:
147
148 G4double lowKinEnergy;
149 G4double fMigdalConstant;
150 G4double bremFactor;
151
152 G4bool isInitialised;
153
154 protected:
155
156 G4bool isElectron;
157
158 };
159
160 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
161
162 inline void G4eBremParametrizedModel::SetCurrentElement(const G4double Z)
163 {
164 if(Z != currentZ) {
165 currentZ = Z;
166
167 G4int iz = G4lrint(Z);
168 z13 = nist->GetZ13(iz);
169 z23 = z13*z13;
170 lnZ = nist->GetLOGZ(iz);
171
172 Fel = facFel - lnZ/3. ;
173 Finel = facFinel - 2.*lnZ/3. ;
174
175 fCoulomb = GetCurrentElement()->GetfCoulomb();
176 fMax = Fel-fCoulomb + Finel/currentZ + (1.+1./currentZ)/12.;
177 }
178 }
179
180 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
181
182
183 #endif
184