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26 //
27 // ----------------------------------------------------------------------------
28 //
29 // GEANT4 Class header file
30 //
31 // File name: G4GSPWACorrections
32 //
33 // Author: Mihaly Novak
34 //
35 // Creation date: 17.10.2017
36 //
37 // Modifications:
38 //
39 // Class description: class to describe and store correction factors to the
40 // integrated quantities of G4GoudsmitSaundersonMscModel (screening parameter,
41 // first and second moments) derived by using accurate Dirac-PWA based
42 // integrated quantities.
43 //
44 // ----------------------------------------------------------------------------
45
46 #ifndef G4GSPWACorrections_h
47 #define G4GSPWACorrections_h 1
48
49 #include <CLHEP/Units/SystemOfUnits.h>
50
51 #include "globals.hh"
52
53 #include <vector>
54 #include <string>
55 #include <sstream>
56
57 class G4Material;
58 class G4Element;
59
60
61 class G4GSPWACorrections {
62 public:
63 G4GSPWACorrections(G4bool iselectron=true);
64
65 ~G4GSPWACorrections();
66
67 void Initialise();
68
69 void GetPWACorrectionFactors(G4double logekin, G4double beta2, G4int matindx,
70 G4double &corToScr, G4double &corToQ1, G4double &corToG2PerG1);
71 private:
72 void InitDataPerElement();
73
74 void InitDataPerMaterials();
75
76 void LoadDataElement(const G4Element*);
77
78 void InitDataMaterial(const G4Material*);
79
80 void ClearDataPerElement();
81
82 void ClearDataPerMaterial();
83
84 // either per material or per Z
85 struct DataPerMaterial {
86 std::vector<G4double> fCorScreening; // correction factor to Moliere screening parameter
87 std::vector<G4double> fCorFirstMoment; // correction factor to first moment
88 std::vector<G4double> fCorSecondMoment; // correction factor to second
89 };
90
91
92 // data members
93 private:
94 G4bool fIsElectron;
95 static constexpr G4int gMaxZet = 98; // max. Z for which correction data were computed (98)
96 static constexpr G4int gNumEkin = 31; // number of kinetic energy grid points for Mott correction
97 static constexpr G4int gNumBeta2 = 16; // \beta^2 values between [fMinBeta2-fMaxBeta2]
98 static constexpr G4double gMinEkin = 1.*CLHEP::keV; // minimum kinetic energy value
99 static constexpr G4double gMidEkin = 100.*CLHEP::keV; // kinetic energy at the border of the E_{kin}-\beta^2 grids
100 static constexpr G4double gMaxBeta2 = 0.9999; // maximum \beta^2 value
101 //
102 G4double fMaxEkin; // from max fMaxBeta2 = 0.9999 (~50.5889 [MeV])
103 G4double fLogMinEkin; // \ln[fMinEkin]
104 G4double fInvLogDelEkin; // 1/[\ln(fMidEkin/fMinEkin)/(fNumEkin-fNumBeta2)]
105 G4double fMinBeta2; // <= E_{kin}=100 [keV] (~0.300546)
106 G4double fInvDelBeta2; // 1/[(fMaxBeta2-fMinBeta2)/(fNumBeta2-1)]
107 //
108 static const std::string gElemSymbols[];
109 //
110 std::vector<DataPerMaterial*> fDataPerElement; // size will be gMaxZet+1; won't be null only at used Z indices
111 std::vector<DataPerMaterial*> fDataPerMaterial; // size will #materials; won't be null only at used mat. indices
112
113 };
114
115 #endif
116