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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 //
30 // GEANT4 Class header file
31 //
32 //
33 // File name: G4WentzelVIModel
34 //
35 // Author: V.Ivanchenko
36 //
37 // Creation date: 09.04.2008 from G4MuMscModel
38 //
39 // Modifications:
40 // 27-05-2010 V.Ivanchenko added G4WentzelOKandVIxSection class to
41 // compute cross sections and sample scattering angle
42 //
43 // Class Description:
44 //
45 // Implementation of the model of multiple scattering based on
46 // G.Wentzel, Z. Phys. 40 (1927) 590.
47 // H.W.Lewis, Phys Rev 78 (1950) 526.
48 // J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
49 // L.Urban, CERN-OPEN-2006-077.
50
51 // -------------------------------------------------------------------
52 //
53
54 #ifndef G4WentzelVIModel_h
55 #define G4WentzelVIModel_h 1
56
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58
59 #include "G4VMscModel.hh"
60 #include "G4MaterialCutsCouple.hh"
61 #include "G4WentzelOKandVIxSection.hh"
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64
65 class G4WentzelVIModel : public G4VMscModel
66 {
67
68 public:
69
70 explicit G4WentzelVIModel(G4bool comb=true, const G4String& nam = "WentzelVIUni");
71
72 ~G4WentzelVIModel() override;
73
74 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
75
76 void InitialiseLocal(const G4ParticleDefinition*,
77 G4VEmModel* masterModel) override;
78
79 void StartTracking(G4Track*) override;
80
81 G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
82 G4double KineticEnergy,
83 G4double AtomicNumber,
84 G4double AtomicWeight=0.,
85 G4double cut = DBL_MAX,
86 G4double emax= DBL_MAX) override;
87
88 G4ThreeVector& SampleScattering(const G4ThreeVector&,
89 G4double safety) override;
90
91 G4double
92 ComputeTruePathLengthLimit(const G4Track& track,
93 G4double& currentMinimalStep) override;
94
95 G4double ComputeGeomPathLength(G4double truePathLength) override;
96
97 G4double ComputeTrueStepLength(G4double geomStepLength) override;
98
99 // defines low energy limit on energy transfer to atomic electron
100 void SetFixedCut(G4double);
101
102 // low energy limit on energy transfer to atomic electron
103 G4double GetFixedCut() const;
104
105 // access to cross section class
106 void SetWVICrossSection(G4WentzelOKandVIxSection*);
107
108 G4WentzelOKandVIxSection* GetWVICrossSection();
109
110 void SetUseSecondMoment(G4bool);
111
112 G4bool UseSecondMoment() const;
113
114 G4PhysicsTable* GetSecondMomentTable();
115
116 G4double SecondMoment(const G4ParticleDefinition*,
117 const G4MaterialCutsCouple*,
118 G4double kineticEnergy);
119
120 void SetSingleScatteringFactor(G4double);
121
122 void DefineMaterial(const G4MaterialCutsCouple*);
123
124 G4WentzelVIModel & operator=(const G4WentzelVIModel &right) = delete;
125 G4WentzelVIModel(const G4WentzelVIModel&) = delete;
126
127 protected:
128
129 G4double ComputeTransportXSectionPerVolume(G4double cosTheta);
130
131 inline void SetupParticle(const G4ParticleDefinition*);
132
133 private:
134
135 G4double ComputeSecondMoment(const G4ParticleDefinition*,
136 G4double kineticEnergy);
137
138 protected:
139
140 G4WentzelOKandVIxSection* wokvi;
141 const G4MaterialCutsCouple* currentCouple = nullptr;
142 const G4Material* currentMaterial = nullptr;
143
144 const G4ParticleDefinition* particle = nullptr;
145 G4ParticleChangeForMSC* fParticleChange = nullptr;
146 const G4DataVector* currentCuts = nullptr;
147 G4PhysicsTable* fSecondMoments = nullptr;
148
149 G4double lowEnergyLimit;
150 G4double tlimitminfix;
151 G4double ssFactor = 1.05;
152 G4double invssFactor = 1.0;
153
154 // cache kinematics
155 G4double preKinEnergy = 0.0;
156 G4double tPathLength = 0.0;
157 G4double zPathLength = 0.0;
158 G4double lambdaeff = 0.0;
159 G4double currentRange = 0.0;
160 G4double cosTetMaxNuc = 0.0;
161
162 G4double fixedCut = -1.0;
163
164 // cache kinematics
165 G4double effKinEnergy = 0.0;
166
167 // single scattering parameters
168 G4double cosThetaMin = 1.0;
169 G4double cosThetaMax = -1.0;
170 G4double xtsec = 0.0;
171
172 G4int currentMaterialIndex = 0;
173 size_t idx2 = 0;
174
175 // data for single scattering mode
176 G4int nelments = 0;
177
178 // flags
179 G4bool singleScatteringMode;
180 G4bool isCombined;
181 G4bool useSecondMoment;
182
183 std::vector<G4double> xsecn;
184 std::vector<G4double> prob;
185 };
186
187 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
188 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
189
190 inline void G4WentzelVIModel::SetupParticle(const G4ParticleDefinition* p)
191 {
192 // Initialise mass and charge
193 if(p != particle) {
194 particle = p;
195 wokvi->SetupParticle(p);
196 }
197 }
198
199 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
200
201 inline void G4WentzelVIModel::SetFixedCut(G4double val)
202 {
203 fixedCut = val;
204 }
205
206 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
207
208 inline G4double G4WentzelVIModel::GetFixedCut() const
209 {
210 return fixedCut;
211 }
212
213 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
214
215 inline void G4WentzelVIModel::SetWVICrossSection(G4WentzelOKandVIxSection* ptr)
216 {
217 if(ptr != wokvi) {
218 delete wokvi;
219 wokvi = ptr;
220 }
221 }
222
223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
224
225 inline G4WentzelOKandVIxSection* G4WentzelVIModel::GetWVICrossSection()
226 {
227 return wokvi;
228 }
229
230 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
231
232 inline void G4WentzelVIModel::SetUseSecondMoment(G4bool val)
233 {
234 useSecondMoment = val;
235 }
236
237 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
238
239 inline G4bool G4WentzelVIModel::UseSecondMoment() const
240 {
241 return useSecondMoment;
242 }
243
244 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
245
246 inline G4PhysicsTable* G4WentzelVIModel::GetSecondMomentTable()
247 {
248 return fSecondMoments;
249 }
250
251 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
252
253 inline G4double
254 G4WentzelVIModel::SecondMoment(const G4ParticleDefinition* part,
255 const G4MaterialCutsCouple* couple,
256 G4double ekin)
257 {
258 G4double x = 0.0;
259 if(useSecondMoment) {
260 DefineMaterial(couple);
261 x = (fSecondMoments) ?
262 (*fSecondMoments)[(*theDensityIdx)[currentMaterialIndex]]->Value(ekin, idx2)
263 *(*theDensityFactor)[currentMaterialIndex]/(ekin*ekin)
264 : ComputeSecondMoment(part, ekin);
265 }
266 return x;
267 }
268
269 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
270
271 #endif
272
273