| Geant4 Cross Reference |
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 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4hCoulombScatteringModel
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 08.06.2012 from G4eCoulombScatteringModel
37 //
38 // Modifications:
39 //
40 // Class Description:
41 //
42 // Implementation of Coulomb Scattering of a charge particle
43 // on Atomic Nucleus for interval of scattering anles in Lab system
44 // thetaMin - ThetaMax.
45 // The model based on analysis of J.M.Fernandez-Varea et al.
46 // NIM B73(1993)447 originated from G.Wentzel Z.Phys. 40(1927)590 with
47 // screening parameter from H.A.Bethe Phys. Rev. 89 (1953) 1256.
48 //
49
50 // -------------------------------------------------------------------
51 //
52
53 #ifndef G4hCoulombScatteringModel_h
54 #define G4hCoulombScatteringModel_h 1
55
56 #include "G4VEmModel.hh"
57 #include "globals.hh"
58 #include "G4MaterialCutsCouple.hh"
59 #include "G4WentzelVIRelXSection.hh"
60
61 class G4ParticleChangeForGamma;
62 class G4ParticleDefinition;
63 class G4IonTable;
64 class G4NistManager;
65
66 class G4hCoulombScatteringModel : public G4VEmModel
67 {
68
69 public:
70
71 explicit G4hCoulombScatteringModel(G4bool combined = true);
72
73 ~G4hCoulombScatteringModel() override;
74
75 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
76
77 void InitialiseLocal(const G4ParticleDefinition*,
78 G4VEmModel* masterModel) override;
79
80 G4double ComputeCrossSectionPerAtom(
81 const G4ParticleDefinition*,
82 G4double kinEnergy,
83 G4double Z,
84 G4double A,
85 G4double cut,
86 G4double emax) override;
87
88 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
89 const G4MaterialCutsCouple*,
90 const G4DynamicParticle*,
91 G4double tmin,
92 G4double maxEnergy) override;
93
94 G4double MinPrimaryEnergy(const G4Material*,
95 const G4ParticleDefinition*,
96 G4double) final;
97
98 // defines low energy limit of the model
99 inline void SetLowEnergyThreshold(G4double val);
100
101 // user definition of low-energy threshold of recoil
102 inline void SetRecoilThreshold(G4double eth);
103
104 // defines low energy limit on energy transfer to atomic electron
105 inline void SetFixedCut(G4double);
106
107 // low energy limit on energy transfer to atomic electron
108 inline G4double GetFixedCut() const;
109
110 // hide assignment operator
111 G4hCoulombScatteringModel & operator=
112 (const G4hCoulombScatteringModel &right) = delete;
113 G4hCoulombScatteringModel(const G4hCoulombScatteringModel&) = delete;
114
115 protected:
116
117 inline void DefineMaterial(const G4MaterialCutsCouple*);
118
119 inline void SetupParticle(const G4ParticleDefinition*);
120
121 private:
122
123 G4IonTable* theIonTable;
124 G4ParticleChangeForGamma* fParticleChange;
125 G4WentzelVIRelXSection* wokvi;
126 G4NistManager* fNistManager;
127
128 const G4ParticleDefinition* particle;
129 const G4ParticleDefinition* theProton;
130 const std::vector<G4double>* pCuts;
131
132 const G4MaterialCutsCouple* currentCouple;
133 const G4Material* currentMaterial;
134 G4int currentMaterialIndex;
135
136 G4double cosThetaMin;
137 G4double cosThetaMax;
138 G4double recoilThreshold;
139 G4double elecRatio;
140 G4double mass;
141
142 G4double fixedCut;
143
144 G4bool isCombined;
145 };
146
147 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
148
149 inline
150 void G4hCoulombScatteringModel::DefineMaterial(const G4MaterialCutsCouple* cup)
151 {
152 if(cup != currentCouple) {
153 currentCouple = cup;
154 currentMaterial = cup->GetMaterial();
155 currentMaterialIndex = currentCouple->GetIndex();
156 }
157 }
158
159 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
160
161 inline
162 void G4hCoulombScatteringModel::SetupParticle(const G4ParticleDefinition* p)
163 {
164 // Initialise mass and charge
165 if(p != particle) {
166 particle = p;
167 mass = particle->GetPDGMass();
168 wokvi->SetupParticle(p);
169 }
170 }
171
172 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
173
174 inline void G4hCoulombScatteringModel::SetRecoilThreshold(G4double eth)
175 {
176 recoilThreshold = eth;
177 }
178
179 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
180
181 inline void G4hCoulombScatteringModel::SetFixedCut(G4double val)
182 {
183 fixedCut = val;
184 }
185
186 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
187
188 inline G4double G4hCoulombScatteringModel::GetFixedCut() const
189 {
190 return fixedCut;
191 }
192
193 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
194
195 #endif
196