include/Geant4/G4GammaXTRadiator.hh

0001 //
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0025 //
0026 ///////////////////////////////////////////////////////////////////////////
0027 //
0028 // Rough process describing a radiator of X-ray transition radiation.
0029 // Thicknesses of plates and gas gaps are distributed according to gamma
0030 // distribution. x are thicknesses of plates or gas gaps:
0031 //
0032 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
0033 //
0034 // G(alpha) is Euler's gamma function.
0035 // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
0036 // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
0037 // We suppose that:
0038 // formation zone ~ mean thickness << absorption length
0039 // for each material and in the range 1-100 keV. This allows us to simplify
0040 // interference effects in radiator stack (GetStackFactor method).
0041 //
0042 // History:
0043 // 21.01.02 V. Grichine, first version
0044 //
0045
0046 #ifndef G4GammaXTRadiator_h
0047 #define G4GammaXTRadiator_h 1
0048
0049 #include "G4LogicalVolume.hh"
0050 #include "G4Material.hh"
0051 #include "G4VXTRenergyLoss.hh"
0052
0053 class G4GammaXTRadiator : public G4VXTRenergyLoss
0054 {
0055  public:
0056   explicit G4GammaXTRadiator(G4LogicalVolume* anEnvelope, G4double, G4double,
0057                              G4Material*, G4Material*, G4double, G4double,
0058                              G4int,
0059                              const G4String& processName = "XTRgammaRadiator");
0060   ~G4GammaXTRadiator();
0061
0062   void ProcessDescription(std::ostream&) const override;
0063   void DumpInfo() const override { ProcessDescription(G4cout); };
0064
0065   G4double GetStackFactor(G4double energy, G4double gamma,
0066                           G4double varAngle) override;
0067 };
0068
0069 #endif