Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/xrays/include/G4GammaXTRadiator.hh

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 25 //
 26 ///////////////////////////////////////////////////////////////////////////
 27 //
 28 // Rough process describing a radiator of X-ray transition radiation.
 29 // Thicknesses of plates and gas gaps are distributed according to gamma
 30 // distribution. x are thicknesses of plates or gas gaps:
 31 //
 32 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
 33 //
 34 // G(alpha) is Euler's gamma function.
 35 // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
 36 // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
 37 // We suppose that:
 38 // formation zone ~ mean thickness << absorption length
 39 // for each material and in the range 1-100 keV. This allows us to simplify
 40 // interference effects in radiator stack (GetStackFactor method).
 41 //
 42 // History:
 43 // 21.01.02 V. Grichine, first version
 44 //
 45 
 46 #ifndef G4GammaXTRadiator_h
 47 #define G4GammaXTRadiator_h 1
 48 
 49 #include "G4LogicalVolume.hh"
 50 #include "G4Material.hh"
 51 #include "G4VXTRenergyLoss.hh"
 52 
 53 class G4GammaXTRadiator : public G4VXTRenergyLoss
 54 {
 55  public:
 56   explicit G4GammaXTRadiator(G4LogicalVolume* anEnvelope, G4double, G4double,
 57                              G4Material*, G4Material*, G4double, G4double,
 58                              G4int,
 59                              const G4String& processName = "XTRgammaRadiator");
 60   ~G4GammaXTRadiator();
 61 
 62   void ProcessDescription(std::ostream&) const override;
 63   void DumpInfo() const override { ProcessDescription(G4cout); };
 64 
 65   G4double GetStackFactor(G4double energy, G4double gamma,
 66                           G4double varAngle) override;
 67 };
 68 
 69 #endif
 70