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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4PAIModel
33 //
34 // Author: V. Grichine based on Vladimir Ivanchenko code
35 //
36 // Creation date: 05.10.2003
37 //
38 // Modifications:
39 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
40 // 26-09-07 Fixed tmax computation (V.Ivantchenko)
41 // 19.08.13 V.Ivanchenko extract data handling to G4PAIModelData class
42 // added sharing of internal data between threads (MT migration)
43 //
44 //
45 // Class Description:
46 //
47 // Implementation of PAI model of energy loss and
48 // delta-electron production by heavy charged particles
49
50 // -------------------------------------------------------------------
51 //
52
53 #ifndef G4PAIModel_h
54 #define G4PAIModel_h 1
55
56 #include <CLHEP/Units/PhysicalConstants.h>
57
58 #include "G4VEmModel.hh"
59 #include "G4VEmFluctuationModel.hh"
60 #include "globals.hh"
61 #include <vector>
62
63 class G4Region;
64 class G4MaterialCutsCouple;
65 class G4ParticleChangeForLoss;
66 class G4PAIModelData;
67
68 class G4PAIModel final : public G4VEmModel, public G4VEmFluctuationModel
69 {
70
71 public:
72
73 explicit G4PAIModel(const G4ParticleDefinition* p = nullptr,
74 const G4String& nam = "PAI");
75
76 ~G4PAIModel() final;
77
78 void Initialise(const G4ParticleDefinition*, const G4DataVector&) final;
79
80 void InitialiseLocal(const G4ParticleDefinition*,
81 G4VEmModel* masterModel) final;
82
83 G4double MinEnergyCut(const G4ParticleDefinition*,
84 const G4MaterialCutsCouple* couple) final;
85
86 G4double ComputeDEDXPerVolume(const G4Material*,
87 const G4ParticleDefinition*,
88 G4double kineticEnergy,
89 G4double cutEnergy) final;
90
91 G4double CrossSectionPerVolume(const G4Material*,
92 const G4ParticleDefinition*,
93 G4double kineticEnergy,
94 G4double cutEnergy,
95 G4double maxEnergy) final;
96
97 void SampleSecondaries(std::vector<G4DynamicParticle*>*,
98 const G4MaterialCutsCouple*,
99 const G4DynamicParticle*,
100 G4double tmin,
101 G4double maxEnergy) final;
102
103 G4double SampleFluctuations(const G4MaterialCutsCouple*,
104 const G4DynamicParticle*,
105 const G4double, const G4double,
106 const G4double, const G4double) final;
107
108 G4double Dispersion(const G4Material*, const G4DynamicParticle*,
109 const G4double, const G4double,
110 const G4double) final;
111
112 void DefineForRegion(const G4Region* r) final;
113
114 inline G4PAIModelData* GetPAIModelData();
115
116 inline const std::vector<const G4MaterialCutsCouple*>& GetVectorOfCouples();
117
118 inline G4double ComputeMaxEnergy(G4double scaledEnergy);
119
120 inline void SetVerboseLevel(G4int verbose);
121
122 // hide assignment operator
123 G4PAIModel & operator=(const G4PAIModel &right) = delete;
124 G4PAIModel(const G4PAIModel&) = delete;
125
126 protected:
127
128 G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
129 G4double kinEnergy) final;
130
131 private:
132
133 inline G4int FindCoupleIndex(const G4MaterialCutsCouple*);
134
135 inline void SetParticle(const G4ParticleDefinition* p);
136
137 G4int fVerbose;
138
139 G4PAIModelData* fModelData;
140
141 std::vector<const G4MaterialCutsCouple*> fMaterialCutsCoupleVector;
142 std::vector<const G4Region*> fPAIRegionVector;
143
144 const G4ParticleDefinition* fParticle;
145 const G4ParticleDefinition* fElectron;
146 const G4ParticleDefinition* fPositron;
147 G4ParticleChangeForLoss* fParticleChange;
148
149 G4double fMass;
150 G4double fRatio;
151 G4double fChargeSquare;
152 G4double fLowestTcut;
153 };
154
155 inline G4PAIModelData* G4PAIModel::GetPAIModelData()
156 {
157 return fModelData;
158 }
159
160 inline const std::vector<const G4MaterialCutsCouple*>&
161 G4PAIModel::GetVectorOfCouples()
162 {
163 return fMaterialCutsCoupleVector;
164 }
165
166 inline G4double G4PAIModel::ComputeMaxEnergy(G4double scaledEnergy)
167 {
168 return MaxSecondaryEnergy(fParticle, scaledEnergy/fRatio);
169 }
170
171 inline void G4PAIModel::SetVerboseLevel(G4int verbose)
172 {
173 fVerbose=verbose;
174 }
175
176 inline G4int G4PAIModel::FindCoupleIndex(const G4MaterialCutsCouple* couple)
177 {
178 G4int idx = -1;
179 G4int jMatMax = (G4int)fMaterialCutsCoupleVector.size();
180 for(G4int jMat = 0;jMat < jMatMax; ++jMat) {
181 if(couple == fMaterialCutsCoupleVector[jMat]) {
182 idx = jMat;
183 break;
184 }
185 }
186 return idx;
187 }
188
189 inline void G4PAIModel::SetParticle(const G4ParticleDefinition* p)
190 {
191 if(fParticle != p) {
192 fParticle = p;
193 fMass = fParticle->GetPDGMass();
194 fRatio = CLHEP::proton_mass_c2/fMass;
195 G4double q = fParticle->GetPDGCharge()/CLHEP::eplus;
196 fChargeSquare = q*q;
197 }
198 }
199
200 #endif
201