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27 // 27 //
28 // Rough model describing a gamma function dis 28 // Rough model describing a gamma function distributed radiator of X-ray
29 // transition radiation. XTR is considered to 29 // transition radiation. XTR is considered to flux after radiator!
30 // Thicknesses of plates and gas gaps are dist 30 // Thicknesses of plates and gas gaps are distributed according to gamma
31 // distribution. x are thicknesses of plates o 31 // distribution. x are thicknesses of plates or gas gaps:
32 // 32 //
33 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * st 33 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
34 // 34 //
35 // G(alpha) is Euler's gamma function. 35 // G(alpha) is Euler's gamma function.
36 // Plates have mean <x> = fPlateThick > 0 and 36 // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
37 // Gas gaps have mean <x> = fGasThick > 0 and 37 // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
38 // We suppose that: 38 // We suppose that:
39 // formation zone ~ mean thickness << absorpti 39 // formation zone ~ mean thickness << absorption length
40 // for each material and in the range 1-100 ke 40 // for each material and in the range 1-100 keV. This allows us to simplify
41 // interference effects in radiator stack (Get 41 // interference effects in radiator stack (GetStackFactor method).
42 // 42 //
43 // History: 43 // History:
44 // 44 //
45 // 03.10.05 V. Grichine, first version 45 // 03.10.05 V. Grichine, first version
46 // 46 //
47 47
48 #ifndef G4XTRGammaRadModel_h 48 #ifndef G4XTRGammaRadModel_h
49 #define G4XTRGammaRadModel_h 1 49 #define G4XTRGammaRadModel_h 1
50 50
51 #include "G4LogicalVolume.hh" 51 #include "G4LogicalVolume.hh"
52 #include "G4Material.hh" 52 #include "G4Material.hh"
53 #include "G4VXTRenergyLoss.hh" 53 #include "G4VXTRenergyLoss.hh"
54 54
55 class G4XTRGammaRadModel : public G4VXTRenergy 55 class G4XTRGammaRadModel : public G4VXTRenergyLoss
56 { 56 {
57 public: 57 public:
58 explicit G4XTRGammaRadModel(G4LogicalVolume* 58 explicit G4XTRGammaRadModel(G4LogicalVolume* anEnvelope, G4double, G4double,
59 G4Material*, G4M 59 G4Material*, G4Material*, G4double, G4double,
60 G4int, 60 G4int,
61 const G4String& 61 const G4String& processName = "XTRgammaRadiator");
62 ~G4XTRGammaRadModel(); 62 ~G4XTRGammaRadModel();
63 63
64 void ProcessDescription(std::ostream&) const 64 void ProcessDescription(std::ostream&) const override;
65 void DumpInfo() const override { ProcessDesc 65 void DumpInfo() const override { ProcessDescription(G4cout); };
66 66
67 G4double GetStackFactor(G4double energy, G4d 67 G4double GetStackFactor(G4double energy, G4double gamma,
68 G4double varAngle) o 68 G4double varAngle) override;
69 }; 69 };
70 70
71 #endif 71 #endif
72 72