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26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4SeltzerBergerModel
33 //
34 // Author: Andreas Schaelicke & Vladimir Ivantchenko
35 //
36 // Creation date: 04.10.2011
37 //
38 // Modifications:
39 //
40 // 24.07.2018 Introduced possibility to use sampling tables to sample the
41 // emitted photon energy (instead of using rejectio) from the
42 // Seltzer-Berger scalled DCS for bremsstrahlung photon emission.
43 // Using these sampling tables option gives faster(30-70%) final
44 // state generation than the original rejection but takes some
45 // extra memory (+ ~6MB in the case of the full CMS detector).
46 // (M Novak)
47 //
48 // Class Description:
49 //
50 // Implementation of the bremssrahlung energy spectrum using
51 // 1. S.M. Seltzer and M.J. Berger Nucl. Instr. Meth. B12 (1985) 95
52 // 2. S.M. Seltzer and M.J. Berger Atomic data and Nuclear Data
53 // Tables 35 (1986) 345
54
55 // -------------------------------------------------------------------
56 //
57
58 #ifndef G4SeltzerBergerModel_h
59 #define G4SeltzerBergerModel_h 1
60
61 #include "G4VEmModel.hh"
62 #include "G4eBremsstrahlungRelModel.hh"
63 #include "globals.hh"
64
65 class G4Physics2DVector;
66 class G4SBBremTable;
67 class G4ParticleChangeForLoss;
68
69 class G4SeltzerBergerModel : public G4VEmModel
70 {
71
72 public:
73
74 explicit G4SeltzerBergerModel(const G4ParticleDefinition* p = nullptr,
75 const G4String& nam = "eBremSB");
76
77 ~G4SeltzerBergerModel() override;
78
79 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
80
81 void InitialiseLocal(const G4ParticleDefinition*,
82 G4VEmModel* masterModel) override;
83
84 G4double ComputeDEDXPerVolume(const G4Material*,
85 const G4ParticleDefinition*,
86 G4double ekin,
87 G4double cutEnergy) override;
88
89 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
90 G4double ekin,
91 G4double zet,
92 G4double,
93 G4double cutEnergy,
94 G4double maxEnergy = DBL_MAX) override;
95
96 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
97 const G4MaterialCutsCouple*,
98 const G4DynamicParticle*,
99 G4double cutEnergy,
100 G4double maxEnergy) override;
101
102 void SetupForMaterial(const G4ParticleDefinition*,
103 const G4Material*, G4double) override;
104
105 G4double MinPrimaryEnergy(const G4Material*,
106 const G4ParticleDefinition*,
107 G4double cutEnergy) override;
108
109 inline void SetBicubicInterpolationFlag(G4bool val)
110 { fIsUseBicubicInterpolation = val; };
111
112 // hide assignment operator and cctr
113 G4SeltzerBergerModel & operator=(const G4SeltzerBergerModel &right) = delete;
114 G4SeltzerBergerModel(const G4SeltzerBergerModel&) = delete;
115
116 private:
117
118 void SetParticle(const G4ParticleDefinition* p);
119
120 void ReadData(G4int Z);
121
122 G4double ComputeBremLoss(G4double cutEnergy);
123
124 G4double ComputeXSectionPerAtom(G4double cutEnergy);
125
126 G4double ComputeDXSectionPerAtom(G4double gammaEnergy);
127
128 G4double SampleEnergyTransfer(const G4double kineticEnergy,
129 const G4double logKineticEnergy,
130 const G4double cut,
131 const G4double emax);
132
133 protected:
134
135 G4ParticleChangeForLoss* fParticleChange{nullptr};
136
137 private:
138
139 static constexpr G4int gMaxZet{101};
140 static constexpr G4double gExpNumLimit{-12.};
141 static G4double gYLimitData[gMaxZet];
142 static G4Physics2DVector* gSBDCSData[gMaxZet];
143 static G4SBBremTable* gSBSamplingTable;
144 static const G4double gBremFactor;
145 static const G4double gMigdalConstant;
146
147 G4bool fIsUseBicubicInterpolation{false};
148 G4bool fIsUseSamplingTables{true};
149 G4bool fIsElectron{true};
150 G4bool fIsScatOffElectron{false};
151 G4bool isInitializer{false};
152 //
153 G4int fCurrentIZ{0};
154 G4int fNumWarnings{0};
155
156 const G4ParticleDefinition* fPrimaryParticle{nullptr};
157 G4ParticleDefinition* fGammaParticle;
158
159 // cash
160 G4double fPrimaryKinEnergy{0.};
161 G4double fPrimaryTotalEnergy{0.};
162 G4double fDensityFactor{0.};
163 G4double fDensityCorr{0.};
164 G4double fLowestKinEnergy;
165
166 std::size_t fIndx{0};
167 std::size_t fIndy{0};
168 };
169
170 #endif
171