1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4RegularXTRadiator.cc,v 1.9 2006/06/29 19:56:09 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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29 | // |
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30 | |
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31 | #include <complex> |
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32 | |
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33 | #include "G4RegularXTRadiator.hh" |
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34 | #include "Randomize.hh" |
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35 | |
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36 | #include "G4Gamma.hh" |
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37 | |
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38 | using namespace std; |
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39 | |
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40 | //////////////////////////////////////////////////////////////////////////// |
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41 | // |
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42 | // Constructor, destructor |
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43 | |
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44 | G4RegularXTRadiator::G4RegularXTRadiator(G4LogicalVolume *anEnvelope, |
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45 | G4Material* foilMat,G4Material* gasMat, |
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46 | G4double a, G4double b, G4int n, |
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47 | const G4String& processName) : |
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48 | G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName) |
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49 | { |
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50 | G4cout<<"Regular X-ray TR radiator EM process is called"<<G4endl ; |
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51 | |
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52 | // Build energy and angular integral spectra of X-ray TR photons from |
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53 | // a radiator |
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54 | |
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55 | fAlphaPlate = 10000; |
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56 | fAlphaGas = 1000; |
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57 | G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ; |
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58 | |
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59 | // BuildTable() ; |
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60 | } |
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61 | |
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62 | /////////////////////////////////////////////////////////////////////////// |
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63 | |
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64 | G4RegularXTRadiator::~G4RegularXTRadiator() |
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65 | { |
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66 | ; |
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67 | } |
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68 | |
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69 | |
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70 | |
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71 | /////////////////////////////////////////////////////////////////////////// |
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72 | // |
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73 | // Approximation for radiator interference factor for the case of |
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74 | // fully Regular radiator. The plate and gas gap thicknesses are fixed . |
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75 | // The mean values of the plate and gas gap thicknesses |
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76 | // are supposed to be about XTR formation zones but much less than |
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77 | // mean absorption length of XTR photons in coresponding material. |
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78 | |
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79 | G4double |
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80 | G4RegularXTRadiator::GetStackFactor( G4double energy, |
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81 | G4double gamma, G4double varAngle ) |
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82 | { |
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83 | |
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84 | // some gamma (10000/1000) like algorithm |
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85 | |
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86 | G4double result, Za, Zb, Ma, Mb; |
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87 | |
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88 | Za = GetPlateFormationZone(energy,gamma,varAngle); |
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89 | Zb = GetGasFormationZone(energy,gamma,varAngle); |
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90 | |
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91 | Ma = GetPlateLinearPhotoAbs(energy); |
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92 | Mb = GetGasLinearPhotoAbs(energy); |
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93 | |
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94 | |
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95 | G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate); |
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96 | G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas); |
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97 | |
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98 | G4complex Ha = pow(Ca,-fAlphaPlate); |
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99 | G4complex Hb = pow(Cb,-fAlphaGas); |
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100 | G4complex H = Ha*Hb; |
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101 | |
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102 | G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H) |
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103 | * G4double(fPlateNumber); |
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104 | |
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105 | G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H) |
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106 | * (1.0 - pow(H,fPlateNumber)); |
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107 | |
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108 | G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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109 | |
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110 | result = 2.0*real(R); |
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111 | |
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112 | return result; |
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113 | |
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114 | /* |
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115 | // numerically stable but slow algorithm |
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116 | |
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117 | G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb; // , D; |
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118 | |
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119 | aZa = fPlateThick/GetPlateFormationZone(energy,gamma,varAngle); |
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120 | bZb = fGasThick/GetGasFormationZone(energy,gamma,varAngle); |
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121 | aMa = fPlateThick*GetPlateLinearPhotoAbs(energy); |
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122 | bMb = fGasThick*GetGasLinearPhotoAbs(energy); |
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123 | Qa = exp(-aMa); |
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124 | Qb = exp(-bMb); |
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125 | Q = Qa*Qb; |
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126 | G4complex Ha( exp(-0.5*aMa)*cos(aZa), |
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127 | -exp(-0.5*aMa)*sin(aZa) ); |
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128 | G4complex Hb( exp(-0.5*bMb)*cos(bZb), |
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129 | -exp(-0.5*bMb)*sin(bZb) ); |
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130 | G4complex H = Ha*Hb; |
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131 | |
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132 | G4complex Hs = conj(H); |
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133 | D = 1.0 /( (1 - sqrt(Q))*(1 - sqrt(Q)) + |
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134 | 4*sqrt(Q)*sin(0.5*(aZa+bZb))*sin(0.5*(aZa+bZb)) ); |
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135 | G4complex F1 = (1.0 - Ha)*(1.0 - Hb)*(1.0 - Hs) |
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136 | * G4double(fPlateNumber)*D; |
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137 | G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb*(1.0-Hs)*(1.0-Hs) |
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138 | * (1.0 - pow(H,fPlateNumber)) * D*D; |
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139 | G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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140 | |
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141 | |
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142 | G4complex S(0.,0.), c(1.,0.); |
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143 | G4int k; |
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144 | for(k = 1; k < fPlateNumber; k++) |
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145 | { |
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146 | c *= H; |
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147 | S += ( G4double(fPlateNumber) - G4double(k) )*c; |
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148 | } |
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149 | G4complex R = (2.- Ha - 1./Ha)*S + (1. - Ha)*G4double(fPlateNumber); |
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150 | R *= OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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151 | result = 2.0*real(R); |
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152 | return result; |
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153 | */ |
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154 | } |
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155 | |
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156 | |
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157 | // |
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158 | // |
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159 | //////////////////////////////////////////////////////////////////////////// |
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160 | |
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167 | |
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