Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/lowenergy/include/G4Generator2BS.hh

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  1 //
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 25 //
 26 //
 27 // -------------------------------------------------------------------
 28 //
 29 // GEANT4 Class file
 30 //
 31 //
 32 // File name:  G4Generator2BS
 33 //
 34 // Author:     Andreia Trindade (andreia@lip.pt)
 35 //             Pedro Rodrigues  (psilva@lip.pt)
 36 //             Luis Peralta     (luis@lip.pt)
 37 // 
 38 // Creation date: 2 June 2003
 39 //
 40 // Modifications: 
 41 // 02 Jun 2003  First implementation acording with new design
 42 // 12 Oct 2010  V.Ivanchenko moved RejectionFunction inline
 43 //               
 44 //
 45 // Class Description: 
 46 //
 47 // Concrete class for Bremsstrahlung Angular Distribution Generation 
 48 // 2BS Distribution
 49 //
 50 
 51 // -------------------------------------------------------------------
 52 //
 53 
 54 #ifndef G4Generator2BS_h
 55 #define G4Generator2BS_h 1
 56 
 57 #include "G4ios.hh"
 58 #include "globals.hh"
 59 #include "G4VEmAngularDistribution.hh"
 60 #include "G4Log.hh"
 61 
 62 class G4Pow;
 63 
 64 class G4Generator2BS : public G4VEmAngularDistribution
 65 {
 66 
 67 public:
 68 
 69   explicit G4Generator2BS(const G4String& name="");
 70 
 71   virtual ~G4Generator2BS();
 72 
 73   G4ThreeVector& SampleDirection(const G4DynamicParticle* dp,
 74          G4double out_energy,
 75          G4int Z,
 76          const G4Material* mat = nullptr) override;
 77 
 78   void PrintGeneratorInformation() const override;
 79 
 80   G4Generator2BS & operator=(const  G4Generator2BS &right)= delete;
 81   G4Generator2BS(const  G4Generator2BS&) = delete;
 82 
 83 protected:
 84   inline G4double RejectionFunction(G4double value) const;
 85 
 86 private:
 87   G4Pow* g4pow;
 88   
 89   G4double fz;
 90   G4double ratio;
 91   G4double ratio1;
 92   G4double ratio2;
 93   G4double delta;
 94 
 95   G4int  nwarn;
 96 
 97 };
 98 
 99 inline G4double G4Generator2BS::RejectionFunction(G4double y) const
100 {
101   G4double y2 = (1 + y)*(1 + y);
102   G4double x  = 4*y*ratio/y2;
103   return 4*x - ratio1 - (ratio2 - x)*G4Log(delta + fz/y2); 
104 }
105 
106 #endif
107 
108