1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // |
---|
27 | // |
---|
28 | |
---|
29 | #include <complex> |
---|
30 | |
---|
31 | #include "G4XTRGammaRadModel.hh" |
---|
32 | #include "Randomize.hh" |
---|
33 | |
---|
34 | #include "G4Gamma.hh" |
---|
35 | |
---|
36 | using namespace std; |
---|
37 | |
---|
38 | //////////////////////////////////////////////////////////////////////////// |
---|
39 | // |
---|
40 | // Constructor, destructor |
---|
41 | |
---|
42 | G4XTRGammaRadModel::G4XTRGammaRadModel(G4LogicalVolume* anEnvelope, |
---|
43 | G4double alphaPlate, |
---|
44 | G4double alphaGas, |
---|
45 | G4Material* foilMat,G4Material* gasMat, |
---|
46 | G4double a, G4double b, G4int n, |
---|
47 | const G4String& processName) : |
---|
48 | G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName) |
---|
49 | { |
---|
50 | G4cout<<"Gammma distributed X-ray TR radiator model is called"<<G4endl ; |
---|
51 | |
---|
52 | // Build energy and angular integral spectra of X-ray TR photons from |
---|
53 | // a radiator |
---|
54 | |
---|
55 | fAlphaPlate = alphaPlate ; |
---|
56 | fAlphaGas = alphaGas ; |
---|
57 | G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ; |
---|
58 | fExitFlux = true; |
---|
59 | // BuildTable() ; |
---|
60 | } |
---|
61 | |
---|
62 | /////////////////////////////////////////////////////////////////////////// |
---|
63 | |
---|
64 | G4XTRGammaRadModel::~G4XTRGammaRadModel() |
---|
65 | { |
---|
66 | ; |
---|
67 | } |
---|
68 | |
---|
69 | |
---|
70 | |
---|
71 | /////////////////////////////////////////////////////////////////////////// |
---|
72 | // |
---|
73 | // Rough approximation for radiator interference factor for the case of |
---|
74 | // fully GamDistr radiator. The plate and gas gap thicknesses are distributed |
---|
75 | // according to exponent. The mean values of the plate and gas gap thicknesses |
---|
76 | // are supposed to be about XTR formation zones but much less than |
---|
77 | // mean absorption length of XTR photons in coresponding material. |
---|
78 | |
---|
79 | G4double |
---|
80 | G4XTRGammaRadModel::GetStackFactor( G4double energy, |
---|
81 | G4double gamma, G4double varAngle ) |
---|
82 | { |
---|
83 | G4double result, Qa, Qb, Q, Za, Zb, Ma, Mb ; |
---|
84 | |
---|
85 | Za = GetPlateFormationZone(energy,gamma,varAngle) ; |
---|
86 | Zb = GetGasFormationZone(energy,gamma,varAngle) ; |
---|
87 | |
---|
88 | Ma = GetPlateLinearPhotoAbs(energy) ; |
---|
89 | Mb = GetGasLinearPhotoAbs(energy) ; |
---|
90 | |
---|
91 | Qa = ( 1.0 + fPlateThick*Ma/fAlphaPlate ) ; |
---|
92 | Qa = std::pow(Qa,-fAlphaPlate) ; |
---|
93 | Qb = ( 1.0 + fGasThick*Mb/fAlphaGas ) ; |
---|
94 | Qb = std::pow(Qb,-fAlphaGas) ; |
---|
95 | Q = Qa*Qb ; |
---|
96 | |
---|
97 | G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate) ; |
---|
98 | G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas) ; |
---|
99 | |
---|
100 | G4complex Ha = std::pow(Ca,-fAlphaPlate) ; |
---|
101 | G4complex Hb = std::pow(Cb,-fAlphaGas) ; |
---|
102 | G4complex H = Ha*Hb ; |
---|
103 | |
---|
104 | G4complex F1 = ( 0.5*(1+Qa)*(1.0+H) - Ha - Qa*Hb )/(1.0-H) ; |
---|
105 | |
---|
106 | G4complex F2 = (1.0-Ha)*(Qa-Ha)*Hb/(1.0-H)/(Q-H) ; |
---|
107 | |
---|
108 | F2 *= std::pow(Q,G4double(fPlateNumber)) - std::pow(H,fPlateNumber) ; |
---|
109 | |
---|
110 | result = ( 1 - std::pow(Q,G4double(fPlateNumber)) )/( 1 - Q ) ; |
---|
111 | |
---|
112 | G4complex stack = result*F1; |
---|
113 | stack += F2; |
---|
114 | stack *= 2.0*OneInterfaceXTRdEdx(energy,gamma,varAngle); |
---|
115 | |
---|
116 | result = std::real(stack); |
---|
117 | |
---|
118 | // result *= 2.0*std::real(F1); |
---|
119 | // result += 2.0*std::real(F2); |
---|
120 | |
---|
121 | return result ; |
---|
122 | } |
---|
123 | |
---|
124 | |
---|
125 | // |
---|
126 | // |
---|
127 | //////////////////////////////////////////////////////////////////////////// |
---|
128 | |
---|
129 | |
---|
130 | |
---|
131 | |
---|
132 | |
---|
133 | |
---|
134 | |
---|
135 | |
---|