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27 // 27 //
28 // Rough process describing a radiator of X-ra 28 // Rough process describing a radiator of X-ray transition radiation.
29 // Thicknesses of plates and gas gaps are dist 29 // Thicknesses of plates and gas gaps are distributed according to gamma
30 // distribution. x are thicknesses of plates o 30 // distribution. x are thicknesses of plates or gas gaps:
31 // 31 //
32 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * st 32 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
33 // 33 //
34 // G(alpha) is Euler's gamma function. 34 // G(alpha) is Euler's gamma function.
35 // Plates have mean <x> = fPlateThick > 0 and 35 // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
36 // Gas gaps have mean <x> = fGasThick > 0 and 36 // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
37 // We suppose that: 37 // We suppose that:
38 // formation zone ~ mean thickness << absorpti 38 // formation zone ~ mean thickness << absorption length
39 // for each material and in the range 1-100 ke 39 // for each material and in the range 1-100 keV. This allows us to simplify
40 // interference effects in radiator stack (Get 40 // interference effects in radiator stack (GetStackFactor method).
41 // 41 //
42 // History: 42 // History:
43 // 21.01.02 V. Grichine, first version 43 // 21.01.02 V. Grichine, first version
44 // 44 //
45 45
46 #ifndef G4GammaXTRadiator_h 46 #ifndef G4GammaXTRadiator_h
47 #define G4GammaXTRadiator_h 1 47 #define G4GammaXTRadiator_h 1
48 48
49 #include "G4LogicalVolume.hh" 49 #include "G4LogicalVolume.hh"
50 #include "G4Material.hh" 50 #include "G4Material.hh"
51 #include "G4VXTRenergyLoss.hh" 51 #include "G4VXTRenergyLoss.hh"
52 52
53 class G4GammaXTRadiator : public G4VXTRenergyL 53 class G4GammaXTRadiator : public G4VXTRenergyLoss
54 { 54 {
55 public: 55 public:
56 explicit G4GammaXTRadiator(G4LogicalVolume* 56 explicit G4GammaXTRadiator(G4LogicalVolume* anEnvelope, G4double, G4double,
57 G4Material*, G4Ma 57 G4Material*, G4Material*, G4double, G4double,
58 G4int, 58 G4int,
59 const G4String& p 59 const G4String& processName = "XTRgammaRadiator");
60 ~G4GammaXTRadiator(); 60 ~G4GammaXTRadiator();
61 61
62 void ProcessDescription(std::ostream&) const 62 void ProcessDescription(std::ostream&) const override;
63 void DumpInfo() const override { ProcessDesc 63 void DumpInfo() const override { ProcessDescription(G4cout); };
64 64
65 G4double GetStackFactor(G4double energy, G4d 65 G4double GetStackFactor(G4double energy, G4double gamma,
66 G4double varAngle) o 66 G4double varAngle) override;
67 }; 67 };
68 68
69 #endif 69 #endif
70 70