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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4eCoulombScatteringModel
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 19.02.2006
37 //
38 // Modifications:
39 // 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
40 // logic of building - only elements from G4ElementTable
41 // 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim
42 // 19.08.06 V.Ivanchenko add inline function ScreeningParameter and
43 // make some members protected
44 // 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e-
45 // 09.06.08 V.Ivanchenko add SelectIsotope and sampling of the recoil ion
46 // 17.06.09 C.Consoalndi modified SetupTarget method - remove kinFactor
47 // 27.05.10 V.Ivanchenko added G4WentzelOKandVIxSection class to
48 // compute cross sections and sample scattering angle
49 //
50 //
51 // Class Description:
52 //
53 // Implementation of eCoulombScattering of a charge particle
54 // on Atomic Nucleus for interval of scattering anles in Lab system
55 // thetaMin - ThetaMax.
56 // The model based on analysis of J.M.Fernandez-Varea et al.
57 // NIM B73(1993)447 originated from G.Wentzel Z.Phys. 40(1927)590 with
58 // screening parameter from H.A.Bethe Phys. Rev. 89 (1953) 1256.
59 //
60
61 // -------------------------------------------------------------------
62 //
63
64 #ifndef G4eCoulombScatteringModel_h
65 #define G4eCoulombScatteringModel_h 1
66
67 #include "G4VEmModel.hh"
68 #include "globals.hh"
69 #include "G4MaterialCutsCouple.hh"
70 #include "G4WentzelOKandVIxSection.hh"
71
72 class G4ParticleChangeForGamma;
73 class G4ParticleDefinition;
74 class G4IonTable;
75 class G4NistManager;
76
77 class G4eCoulombScatteringModel : public G4VEmModel
78 {
79
80 public:
81
82 explicit G4eCoulombScatteringModel(G4bool combined = true);
83
84 ~G4eCoulombScatteringModel() override;
85
86 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
87
88 void InitialiseLocal(const G4ParticleDefinition*,
89 G4VEmModel* masterModel) override;
90
91 G4double ComputeCrossSectionPerAtom(
92 const G4ParticleDefinition*,
93 G4double kinEnergy,
94 G4double Z,
95 G4double A,
96 G4double cut,
97 G4double emax) override;
98
99 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
100 const G4MaterialCutsCouple*,
101 const G4DynamicParticle*,
102 G4double tmin,
103 G4double maxEnergy) override;
104
105 G4double MinPrimaryEnergy(const G4Material*, const G4ParticleDefinition*,
106 G4double) final;
107
108 // defines low energy limit of the model
109 inline void SetLowEnergyThreshold(G4double val);
110
111 // user definition of low-energy threshold of recoil
112 inline void SetRecoilThreshold(G4double eth);
113
114 // defines low energy limit on energy transfer to atomic electron
115 inline void SetFixedCut(G4double);
116
117 // low energy limit on energy transfer to atomic electron
118 inline G4double GetFixedCut() const;
119
120 // hide assignment operator
121 G4eCoulombScatteringModel & operator=
122 (const G4eCoulombScatteringModel &right) = delete;
123 G4eCoulombScatteringModel(const G4eCoulombScatteringModel&) = delete;
124
125 protected:
126
127 inline void DefineMaterial(const G4MaterialCutsCouple*);
128
129 inline void SetupParticle(const G4ParticleDefinition*);
130
131 private:
132
133 G4IonTable* theIonTable;
134 G4ParticleChangeForGamma* fParticleChange = nullptr;
135 G4WentzelOKandVIxSection* wokvi;
136 G4NistManager* fNistManager;
137
138 const std::vector<G4double>* pCuts = nullptr;
139
140 const G4ParticleDefinition* particle = nullptr;
141 const G4ParticleDefinition* theProton;
142
143 const G4MaterialCutsCouple* currentCouple = nullptr;
144 const G4Material* currentMaterial = nullptr;
145 G4int currentMaterialIndex = 0;
146
147 G4double cosThetaMin = 1.0;
148 G4double cosThetaMax = -1.0;
149 G4double recoilThreshold = 0.0;
150 G4double elecRatio = 0.0;
151 G4double fixedCut = -1.0;
152 G4double mass;
153
154 G4bool isCombined;
155 };
156
157 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
158
159 inline
160 void G4eCoulombScatteringModel::DefineMaterial(const G4MaterialCutsCouple* cup)
161 {
162 if(cup != currentCouple) {
163 currentCouple = cup;
164 currentMaterial = cup->GetMaterial();
165 currentMaterialIndex = currentCouple->GetIndex();
166 }
167 }
168
169 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
170
171 inline
172 void G4eCoulombScatteringModel::SetupParticle(const G4ParticleDefinition* p)
173 {
174 // Initialise mass and charge
175 if(p != particle) {
176 particle = p;
177 mass = particle->GetPDGMass();
178 wokvi->SetupParticle(p);
179 }
180 }
181
182 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
183
184 inline void G4eCoulombScatteringModel::SetRecoilThreshold(G4double eth)
185 {
186 recoilThreshold = eth;
187 }
188
189 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
190
191 inline void G4eCoulombScatteringModel::SetFixedCut(G4double val)
192 {
193 fixedCut = val;
194 }
195
196 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
197
198 inline G4double G4eCoulombScatteringModel::GetFixedCut() const
199 {
200 return fixedCut;
201 }
202
203 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
204
205 #endif
206