| Geant4 Cross Reference |
1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
>> 23 //
>> 24 // $Id: G4GammaXTRadiator.cc,v 1.3 2004/12/02 08:31:07 vnivanch Exp $
>> 25 // GEANT4 tag $Name: geant4-07-00-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
>> 35 using namespace std;
>> 36
31 ////////////////////////////////////////////// 37 ////////////////////////////////////////////////////////////////////////////
>> 38 //
32 // Constructor, destructor 39 // Constructor, destructor
33 G4GammaXTRadiator::G4GammaXTRadiator(G4Logical << 40
34 G4double << 41 G4GammaXTRadiator::G4GammaXTRadiator(G4LogicalVolume* anEnvelope,
35 G4Materia << 42 G4double alphaPlate,
>> 43 G4double alphaGas,
>> 44 G4Material* foilMat,G4Material* gasMat,
36 G4double 45 G4double a, G4double b, G4int n,
37 const G4S << 46 const G4String& processName) :
38 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM << 47 G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName)
39 { 48 {
40 G4cout << "Gamma distributed X-ray TR radiat << 49 G4cout<<"Gammma distributed X-ray TR radiator model is called"<<G4endl ;
41 50
42 // Build energy and angular integral spectra 51 // Build energy and angular integral spectra of X-ray TR photons from
43 // a radiator 52 // a radiator
44 53
45 fAlphaPlate = alphaPlate; << 54 fAlphaPlate = alphaPlate ;
46 fAlphaGas = alphaGas; << 55 fAlphaGas = alphaGas ;
47 G4cout << "fAlphaPlate = " << fAlphaPlate << << 56 G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ;
48 << G4endl; << 57
>> 58 BuildTable() ;
49 } 59 }
50 60
51 ////////////////////////////////////////////// 61 ///////////////////////////////////////////////////////////////////////////
52 G4GammaXTRadiator::~G4GammaXTRadiator() = defa <<
53 62
54 void G4GammaXTRadiator::ProcessDescription(std << 63 G4GammaXTRadiator::~G4GammaXTRadiator()
55 { 64 {
56 out << 65 ;
57 << "Rough approximation describing a radia <<
58 "radiation.\n" <<
59 "Thicknesses of plates and gas gaps are <<
60 "description.\n"; <<
61 } 66 }
62 67
>> 68
>> 69
63 ////////////////////////////////////////////// 70 ///////////////////////////////////////////////////////////////////////////
>> 71 //
64 // Rough approximation for radiator interferen 72 // Rough approximation for radiator interference factor for the case of
65 // fully GamDistr radiator. The plate and gas << 73 // fully GamDistr radiator. The plate and gas gap thicknesses are distributed
66 // according to exponent. The mean values of t << 74 // according to exponent. The mean values of the plate and gas gap thicknesses
67 // are supposed to be about XTR formation zone << 75 // are supposed to be about XTR formation zones but much less than
68 // mean absorption length of XTR photons in co << 76 // mean absorption length of XTR photons in coresponding material.
69 G4double G4GammaXTRadiator::GetStackFactor(G4d << 77
70 G4d << 78 G4double
>> 79 G4GammaXTRadiator::GetStackFactor( G4double energy,
>> 80 G4double gamma, G4double varAngle )
71 { 81 {
72 G4double result, Za, Zb, Ma, Mb; << 82 G4double result, Za, Zb, Ma, Mb ;
73 << 83
74 Za = GetPlateFormationZone(energy, gamma, va << 84 Za = GetPlateFormationZone(energy,gamma,varAngle) ;
75 Zb = GetGasFormationZone(energy, gamma, varA << 85 Zb = GetGasFormationZone(energy,gamma,varAngle) ;
76 86
77 Ma = GetPlateLinearPhotoAbs(energy); << 87 Ma = GetPlateLinearPhotoAbs(energy) ;
78 Mb = GetGasLinearPhotoAbs(energy); << 88 Mb = GetGasLinearPhotoAbs(energy) ;
79 89
80 G4complex Ca(1.0 + 0.5 * fPlateThick * Ma / <<
81 fPlateThick / Za / fAlphaPlate) <<
82 G4complex Cb(1.0 + 0.5 * fGasThick * Mb / fA <<
83 fGasThick / Zb / fAlphaGas); <<
84 90
85 G4complex Ha = std::pow(Ca, -fAlphaPlate); << 91 G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate) ;
86 G4complex Hb = std::pow(Cb, -fAlphaGas); << 92 G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas) ;
87 G4complex H = Ha * Hb; <<
88 93
89 G4complex F1 = (1.0 - Ha) * (1.0 - Hb) / (1. << 94 G4complex Ha = pow(Ca,-fAlphaPlate) ;
>> 95 G4complex Hb = pow(Cb,-fAlphaGas) ;
>> 96 G4complex H = Ha*Hb ;
90 97
91 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb << 98 G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H)
92 (1.0 - std::pow(H, fPlateNumb << 99 * G4double(fPlateNumber) ;
93 100
94 G4complex R = (F1 + F2) * OneInterfaceXTRdEd << 101 G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H)
>> 102 * (1.0 - pow(H,fPlateNumber)) ;
95 103
96 result = 2.0 * std::real(R); << 104 G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle) ;
97 105
98 return result; << 106 result = 2.0*real(R) ;
>> 107
>> 108 return result ;
99 } 109 }
>> 110
>> 111
>> 112 //
>> 113 //
>> 114 ////////////////////////////////////////////////////////////////////////////
>> 115
>> 116
>> 117
>> 118
>> 119
>> 120
>> 121
>> 122
100 123