include/Geant4/G4GSPWACorrections.hh

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0026 //
0027 // ----------------------------------------------------------------------------
0028 //
0029 // GEANT4 Class header file
0030 //
0031 // File name:     G4GSPWACorrections
0032 //
0033 // Author:        Mihaly Novak
0034 //
0035 // Creation date: 17.10.2017
0036 //
0037 // Modifications:
0038 //
0039 // Class description: class to describe and store correction factors to the
0040 //   integrated quantities of G4GoudsmitSaundersonMscModel (screening parameter,
0041 //   first and second moments) derived by using accurate Dirac-PWA based
0042 //   integrated quantities.
0043 //
0044 // References:
0045 //   M. Novak: https://arxiv.org/abs/2410.13361
0046 //
0047 // ----------------------------------------------------------------------------
0048
0049 #ifndef G4GSPWACorrections_h
0050 #define G4GSPWACorrections_h 1
0051
0052 #include <CLHEP/Units/SystemOfUnits.h>
0053
0054 #include "globals.hh"
0055
0056 #include <vector>
0057 #include <string>
0058 #include <sstream>
0059
0060 class G4Material;
0061 class G4Element;
0062
0063
0064 class G4GSPWACorrections {
0065 public:
0066   G4GSPWACorrections(G4bool iselectron=true);
0067
0068  ~G4GSPWACorrections();
0069
0070   void     Initialise();
0071
0072   void     GetPWACorrectionFactors(G4double logekin, G4double beta2, G4int matindx,
0073                                    G4double &corToScr, G4double &corToQ1, G4double &corToG2PerG1);
0074 private:
0075   void     InitDataPerElement();
0076
0077   void     InitDataPerMaterials();
0078
0079   void     LoadDataElement(const G4Element*);
0080
0081   void     InitDataMaterial(const G4Material*);
0082
0083   void     ClearDataPerElement();
0084
0085   void     ClearDataPerMaterial();
0086
0087   // either per material or per Z
0088   struct DataPerMaterial {
0089     std::vector<G4double>   fCorScreening;    // correction factor to Moliere screening parameter
0090     std::vector<G4double>   fCorFirstMoment;  // correction factor to first moment
0091     std::vector<G4double>   fCorSecondMoment; // correction factor to second
0092   };
0093
0094
0095 // data members
0096 private:
0097   G4bool   fIsElectron;
0098   static constexpr G4int     gMaxZet    = 98;                 // max. Z for which correction data were computed (98)
0099   static constexpr G4int     gNumEkin   = 31;                 // number of kinetic energy grid points for Mott correction
0100   static constexpr G4int     gNumBeta2  = 16;                 // \beta^2 values between [fMinBeta2-fMaxBeta2]
0101   static constexpr G4double  gMinEkin   =   1.*CLHEP::keV;    // minimum kinetic energy value
0102   static constexpr G4double  gMidEkin   = 100.*CLHEP::keV;    // kinetic energy at the border of the E_{kin}-\beta^2 grids
0103   static constexpr G4double  gMaxBeta2  =   0.9999;           // maximum \beta^2 value
0104   //
0105   G4double                   fMaxEkin;        // from max fMaxBeta2 = 0.9999 (~50.5889 [MeV])
0106   G4double                   fLogMinEkin;     // \ln[fMinEkin]
0107   G4double                   fInvLogDelEkin;  // 1/[\ln(fMidEkin/fMinEkin)/(fNumEkin-fNumBeta2)]
0108   G4double                   fMinBeta2;       // <= E_{kin}=100 [keV] (~0.300546)
0109   G4double                   fInvDelBeta2;    // 1/[(fMaxBeta2-fMinBeta2)/(fNumBeta2-1)]
0110   //
0111   static const std::string   gElemSymbols[];
0112   //
0113   std::vector<DataPerMaterial*>  fDataPerElement;   // size will be gMaxZet+1; won't be null only at used Z indices
0114   std::vector<DataPerMaterial*>  fDataPerMaterial;  // size will #materials; won't be null only at used mat. indices
0115
0116 };
0117
0118 #endif