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26 ////////////////////////////////////////////// <<
27 // 26 //
28 // Rough process describing a radiator of X-ra << 27 // $Id$
29 // Thicknesses of plates and gas gaps are dist << 28 //
>> 29 //
>> 30 ///////////////////////////////////////////////////////////////////////////
>> 31 //
>> 32 // Rough process describing a radiator of X-ray transition radiation.
>> 33 // Thicknesses of plates and gas gaps are distributed according to gamma
30 // distribution. x are thicknesses of plates o 34 // distribution. x are thicknesses of plates or gas gaps:
31 // 35 //
32 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * st 36 // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha)
33 // 37 //
34 // G(alpha) is Euler's gamma function. 38 // G(alpha) is Euler's gamma function.
35 // Plates have mean <x> = fPlateThick > 0 and 39 // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 :
36 // Gas gaps have mean <x> = fGasThick > 0 and 40 // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 :
37 // We suppose that: 41 // We suppose that:
38 // formation zone ~ mean thickness << absorpti 42 // formation zone ~ mean thickness << absorption length
39 // for each material and in the range 1-100 ke 43 // for each material and in the range 1-100 keV. This allows us to simplify
40 // interference effects in radiator stack (Get 44 // interference effects in radiator stack (GetStackFactor method).
41 // << 45 //
>> 46 //
42 // History: 47 // History:
43 // 21.01.02 V. Grichine, first version << 48 // 21.01.02 V. Grichine, first version
44 // 49 //
45 50
>> 51
46 #ifndef G4GammaXTRadiator_h 52 #ifndef G4GammaXTRadiator_h
47 #define G4GammaXTRadiator_h 1 53 #define G4GammaXTRadiator_h 1
48 54
49 #include "G4LogicalVolume.hh" <<
50 #include "G4Material.hh" <<
51 #include "G4VXTRenergyLoss.hh" 55 #include "G4VXTRenergyLoss.hh"
52 56
53 class G4GammaXTRadiator : public G4VXTRenergyL 57 class G4GammaXTRadiator : public G4VXTRenergyLoss
54 { 58 {
55 public: << 59 public:
56 explicit G4GammaXTRadiator(G4LogicalVolume* << 60
57 G4Material*, G4Ma << 61 G4GammaXTRadiator (G4LogicalVolume *anEnvelope,
58 G4int, << 62 G4double,G4double,
59 const G4String& p << 63 G4Material*,G4Material*,
60 ~G4GammaXTRadiator(); << 64 G4double,G4double,G4int,
>> 65 const G4String & processName = "XTRgammaRadiator");
>> 66 ~G4GammaXTRadiator ();
>> 67
>> 68 // Pure virtual function from base class
61 69
62 void ProcessDescription(std::ostream&) const << 70 G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle);
63 void DumpInfo() const override { ProcessDesc << 71
>> 72 private:
64 73
65 G4double GetStackFactor(G4double energy, G4d <<
66 G4double varAngle) o <<
67 }; 74 };
68 75
69 #endif 76 #endif
>> 77
>> 78
>> 79
>> 80
>> 81
>> 82
70 83