include/Geant4/G4ElectroNuclearCrossSection.hh

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0027 // GEANT4 physics class: G4ElectroNuclearCrossSection -- header file
0028 // M.V. Kossov, ITEP(Moscow), 24-OCT-01
0029 // The last update: M.V. Kossov, CERN/ITEP (Moscow) 25-Sept-03
0030
0031 // A. Dotti 2-May-2013: Re-write caching logic and optimizations
0032
0033 #ifndef G4ElectroNuclearCrossSection_h
0034 #define G4ElectroNuclearCrossSection_h 1
0035
0036 #include "G4VCrossSectionDataSet.hh"
0037 #include "G4DynamicParticle.hh"
0038 #include "G4Element.hh"
0039 #include "G4ParticleTable.hh"
0040 #include "G4NucleiProperties.hh"
0041 #include "G4NistManager.hh"
0042 #include <vector>
0043 #include "Randomize.hh"
0044 #include "G4Electron.hh"
0045 #include "G4Positron.hh"
0046 #include <map>
0047
0048 //A cache element
0049 struct cacheEl_t {
0050     G4int F;
0051     G4double* J1;
0052     G4double* J2;
0053     G4double* J3;
0054     G4double H;
0055     G4double TH;
0056 };
0057
0058 class G4ElectroNuclearCrossSection : public G4VCrossSectionDataSet
0059 {
0060 public:
0061
0062   G4ElectroNuclearCrossSection();
0063   ~G4ElectroNuclearCrossSection() override;
0064
0065   static const char* Default_Name() {return "ElectroNuclearXS";}
0066
0067   void CrossSectionDescription(std::ostream&) const override;
0068
0069   G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z,
0070                              const G4Material*) override;
0071   G4double GetElementCrossSection(const G4DynamicParticle*, G4int Z,
0072                                   const G4Material* mat) override;
0073
0074   G4double GetEquivalentPhotonEnergy();
0075
0076   G4double GetVirtualFactor(G4double nu, G4double Q2);
0077
0078   G4double GetEquivalentPhotonQ2(G4double nu);
0079
0080   G4ElectroNuclearCrossSection& operator=
0081   (const G4ElectroNuclearCrossSection &right) = delete;
0082   G4ElectroNuclearCrossSection(const G4ElectroNuclearCrossSection&) = delete;
0083
0084 private:
0085   G4int    GetFunctions(G4double a, G4double* x, G4double* y, G4double* z);
0086
0087   G4double ThresholdEnergy(G4int Z, G4int N);
0088   G4double SolveTheEquation(G4double f);
0089   G4double Fun(G4double x);
0090   G4double DFun(G4double x);
0091
0092   G4double HighEnergyJ1(G4double lE);
0093   G4double HighEnergyJ2(G4double lE, G4double E);
0094   G4double HighEnergyJ3(G4double lE, G4double E2);
0095
0096 // Body
0097 private:
0098     G4int currentN;
0099     G4int currentZ;
0100
0101     //Cache structure
0102     G4int lastZ;
0103     std::vector<cacheEl_t*> cache;
0104     cacheEl_t* lastUsedCacheEl;
0105     G4NistManager* nistmngr;
0106
0107     //Cache values for XS
0108     G4double lastE ; //Last used energy value
0109     G4double lastSig; //Last used XS value
0110     G4double lastG; //Last value of gamma=lnE-ln(me)
0111     G4int    lastL; //Last used in the cross section TheLastBin
0112
0113     const G4double mNeut;
0114     const G4double mProt;
0115 };
0116
0117 #endif