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1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
>> 23 //
>> 24 // $Id: G4GammaXTRadiator.cc,v 1.2 2003/06/16 17:02:55 gunter Exp $
>> 25 // GEANT4 tag $Name: geant4-05-02-patch-01 $
>> 26 //
>> 27
>> 28 #include <complex>
26 29
27 #include "G4GammaXTRadiator.hh" 30 #include "G4GammaXTRadiator.hh"
>> 31 #include "Randomize.hh"
28 32
29 #include "G4Gamma.hh" 33 #include "G4Gamma.hh"
30 34
31 ////////////////////////////////////////////// 35 ////////////////////////////////////////////////////////////////////////////
>> 36 //
32 // Constructor, destructor 37 // Constructor, destructor
33 G4GammaXTRadiator::G4GammaXTRadiator(G4Logical << 38
34 G4double << 39 G4GammaXTRadiator::G4GammaXTRadiator(G4LogicalVolume* anEnvelope,
35 G4Materia << 40 G4double alphaPlate,
>> 41 G4double alphaGas,
>> 42 G4Material* foilMat,G4Material* gasMat,
36 G4double 43 G4double a, G4double b, G4int n,
37 const G4S << 44 const G4String& processName) :
38 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM << 45 G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName)
39 { 46 {
40 G4cout << "Gamma distributed X-ray TR radiat << 47 G4cout<<"Gammma distributed X-ray TR radiator model is called"<<G4endl ;
41 48
42 // Build energy and angular integral spectra 49 // Build energy and angular integral spectra of X-ray TR photons from
43 // a radiator 50 // a radiator
44 51
45 fAlphaPlate = alphaPlate; << 52 fAlphaPlate = alphaPlate ;
46 fAlphaGas = alphaGas; << 53 fAlphaGas = alphaGas ;
47 G4cout << "fAlphaPlate = " << fAlphaPlate << << 54 G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ;
48 << G4endl; << 55
>> 56 BuildTable() ;
49 } 57 }
50 58
51 ////////////////////////////////////////////// 59 ///////////////////////////////////////////////////////////////////////////
52 G4GammaXTRadiator::~G4GammaXTRadiator() = defa <<
53 60
54 void G4GammaXTRadiator::ProcessDescription(std << 61 G4GammaXTRadiator::~G4GammaXTRadiator()
55 { 62 {
56 out << 63 ;
57 << "Rough approximation describing a radia <<
58 "radiation.\n" <<
59 "Thicknesses of plates and gas gaps are <<
60 "description.\n"; <<
61 } 64 }
62 65
>> 66
>> 67
63 ////////////////////////////////////////////// 68 ///////////////////////////////////////////////////////////////////////////
>> 69 //
64 // Rough approximation for radiator interferen 70 // Rough approximation for radiator interference factor for the case of
65 // fully GamDistr radiator. The plate and gas << 71 // fully GamDistr radiator. The plate and gas gap thicknesses are distributed
66 // according to exponent. The mean values of t << 72 // according to exponent. The mean values of the plate and gas gap thicknesses
67 // are supposed to be about XTR formation zone << 73 // are supposed to be about XTR formation zones but much less than
68 // mean absorption length of XTR photons in co << 74 // mean absorption length of XTR photons in coresponding material.
69 G4double G4GammaXTRadiator::GetStackFactor(G4d << 75
70 G4d << 76 G4double
>> 77 G4GammaXTRadiator::GetStackFactor( G4double energy,
>> 78 G4double gamma, G4double varAngle )
71 { 79 {
72 G4double result, Za, Zb, Ma, Mb; << 80 G4double result, Za, Zb, Ma, Mb ;
>> 81
>> 82 Za = GetPlateFormationZone(energy,gamma,varAngle) ;
>> 83 Zb = GetGasFormationZone(energy,gamma,varAngle) ;
73 84
74 Za = GetPlateFormationZone(energy, gamma, va << 85 Ma = GetPlateLinearPhotoAbs(energy) ;
75 Zb = GetGasFormationZone(energy, gamma, varA << 86 Mb = GetGasLinearPhotoAbs(energy) ;
76 87
77 Ma = GetPlateLinearPhotoAbs(energy); <<
78 Mb = GetGasLinearPhotoAbs(energy); <<
79 88
80 G4complex Ca(1.0 + 0.5 * fPlateThick * Ma / << 89 G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate) ;
81 fPlateThick / Za / fAlphaPlate) << 90 G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas) ;
82 G4complex Cb(1.0 + 0.5 * fGasThick * Mb / fA <<
83 fGasThick / Zb / fAlphaGas); <<
84 91
85 G4complex Ha = std::pow(Ca, -fAlphaPlate); << 92 G4complex Ha = std::pow(Ca,-fAlphaPlate) ;
86 G4complex Hb = std::pow(Cb, -fAlphaGas); << 93 G4complex Hb = std::pow(Cb,-fAlphaGas) ;
87 G4complex H = Ha * Hb; << 94 G4complex H = Ha*Hb ;
88 95
89 G4complex F1 = (1.0 - Ha) * (1.0 - Hb) / (1. << 96 G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H)
>> 97 * G4double(fPlateNumber) ;
90 98
91 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb << 99 G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H)
92 (1.0 - std::pow(H, fPlateNumb << 100 * (1.0 - std::pow(H,fPlateNumber)) ;
93 101
94 G4complex R = (F1 + F2) * OneInterfaceXTRdEd << 102 G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle) ;
95 103
96 result = 2.0 * std::real(R); << 104 result = 2.0*std::real(R) ;
97 << 105
98 return result; << 106 return result ;
99 } 107 }
>> 108
>> 109
>> 110 //
>> 111 //
>> 112 ////////////////////////////////////////////////////////////////////////////
>> 113
>> 114
>> 115
>> 116
>> 117
>> 118
>> 119
>> 120
100 121