Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/xrays/include/G4XTRGammaRadModel.hh

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 25 //
 26 ///////////////////////////////////////////////////////////////////////////
 27 //
 28 // Rough model describing a gamma function distributed radiator of X-ray
 29 // transition radiation. XTR is considered to flux after radiator!
 30 // Thicknesses of plates and gas gaps are distributed according to gamma
 31 // distribution. x are thicknesses of plates or gas gaps:
 32 //
 33 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
 34 //
 35 // G(alpha) is Euler's gamma function.
 36 // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
 37 // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
 38 // We suppose that:
 39 // formation zone ~ mean thickness << absorption length
 40 // for each material and in the range 1-100 keV. This allows us to simplify
 41 // interference effects in radiator stack (GetStackFactor method).
 42 //
 43 // History:
 44 //
 45 // 03.10.05 V. Grichine, first version
 46 //
 47 
 48 #ifndef G4XTRGammaRadModel_h
 49 #define G4XTRGammaRadModel_h 1
 50 
 51 #include "G4LogicalVolume.hh"
 52 #include "G4Material.hh"
 53 #include "G4VXTRenergyLoss.hh"
 54 
 55 class G4XTRGammaRadModel : public G4VXTRenergyLoss
 56 {
 57  public:
 58   explicit G4XTRGammaRadModel(G4LogicalVolume* anEnvelope, G4double, G4double,
 59                               G4Material*, G4Material*, G4double, G4double,
 60                               G4int,
 61                               const G4String& processName = "XTRgammaRadiator");
 62   ~G4XTRGammaRadModel();
 63 
 64   void ProcessDescription(std::ostream&) const override;
 65   void DumpInfo() const override { ProcessDescription(G4cout); };
 66 
 67   G4double GetStackFactor(G4double energy, G4double gamma,
 68                           G4double varAngle) override;
 69 };
 70 
 71 #endif
 72