[819] | 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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[1192] | 26 | // $Id: G4eBremsstrahlungSpectrum.cc,v 1.16 2009/06/10 13:32:36 mantero Exp $ |
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[1347] | 27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[819] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: G4eBremsstrahlungSpectrum |
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| 35 | // |
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| 36 | // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch) |
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| 37 | // |
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| 38 | // Creation date: 29 September 2001 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // 10.10.01 MGP Revision to improve code quality and consistency with design |
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| 42 | // 15.11.01 VI Update spectrum model Bethe-Haitler spectrum at high energy |
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| 43 | // 30.05.02 VI Update interpolation between 2 last energy points in the |
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| 44 | // parametrisation |
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| 45 | // 21.02.03 V.Ivanchenko Energy bins are defined in the constructor |
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| 46 | // 28.02.03 V.Ivanchenko Filename is defined in the constructor |
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| 47 | // |
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| 48 | // ------------------------------------------------------------------- |
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| 49 | |
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| 50 | #include "G4eBremsstrahlungSpectrum.hh" |
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| 51 | #include "G4BremsstrahlungParameters.hh" |
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| 52 | #include "Randomize.hh" |
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| 53 | |
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| 54 | |
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| 55 | G4eBremsstrahlungSpectrum::G4eBremsstrahlungSpectrum(const G4DataVector& bins, |
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| 56 | const G4String& name):G4VEnergySpectrum(), |
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| 57 | lowestE(0.1*eV), |
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| 58 | xp(bins) |
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| 59 | { |
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| 60 | length = xp.size(); |
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| 61 | theBRparam = new G4BremsstrahlungParameters(name,length+1); |
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| 62 | |
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| 63 | verbose = 0; |
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| 64 | } |
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| 65 | |
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| 66 | |
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| 67 | G4eBremsstrahlungSpectrum::~G4eBremsstrahlungSpectrum() |
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| 68 | { |
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| 69 | delete theBRparam; |
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| 70 | } |
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| 71 | |
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| 72 | |
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| 73 | G4double G4eBremsstrahlungSpectrum::Probability(G4int Z, |
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| 74 | G4double tmin, |
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| 75 | G4double tmax, |
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| 76 | G4double e, |
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| 77 | G4int, |
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| 78 | const G4ParticleDefinition*) const |
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| 79 | { |
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| 80 | G4double tm = std::min(tmax, e); |
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| 81 | G4double t0 = std::max(tmin, lowestE); |
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| 82 | if(t0 >= tm) return 0.0; |
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| 83 | |
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| 84 | t0 /= e; |
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| 85 | tm /= e; |
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| 86 | |
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| 87 | G4double z0 = lowestE/e; |
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| 88 | G4DataVector p; |
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| 89 | |
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| 90 | // Access parameters |
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| 91 | for (size_t i=0; i<=length; i++) { |
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| 92 | p.push_back(theBRparam->Parameter(i, Z, e)); |
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| 93 | } |
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| 94 | |
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| 95 | G4double x = IntSpectrum(t0, tm, p); |
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| 96 | G4double y = IntSpectrum(z0, 1.0, p); |
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| 97 | |
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| 98 | |
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| 99 | if(1 < verbose) { |
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| 100 | G4cout << "tcut(MeV)= " << tmin/MeV |
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| 101 | << "; tMax(MeV)= " << tmax/MeV |
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| 102 | << "; t0= " << t0 |
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| 103 | << "; tm= " << tm |
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| 104 | << "; xp[0]= " << xp[0] |
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| 105 | << "; z= " << z0 |
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| 106 | << "; val= " << x |
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| 107 | << "; nor= " << y |
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| 108 | << G4endl; |
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| 109 | } |
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| 110 | p.clear(); |
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| 111 | |
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| 112 | if(y > 0.0) x /= y; |
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| 113 | else x = 0.0; |
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| 114 | // if(x < 0.0) x = 0.0; |
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| 115 | |
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| 116 | return x; |
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| 117 | } |
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| 118 | |
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| 119 | |
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| 120 | G4double G4eBremsstrahlungSpectrum::AverageEnergy(G4int Z, |
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| 121 | G4double tmin, |
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| 122 | G4double tmax, |
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| 123 | G4double e, |
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| 124 | G4int, |
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| 125 | const G4ParticleDefinition*) const |
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| 126 | { |
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| 127 | G4double tm = std::min(tmax, e); |
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| 128 | G4double t0 = std::max(tmin, lowestE); |
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| 129 | if(t0 >= tm) return 0.0; |
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| 130 | |
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| 131 | t0 /= e; |
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| 132 | tm /= e; |
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| 133 | |
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| 134 | G4double z0 = lowestE/e; |
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| 135 | |
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| 136 | G4DataVector p; |
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| 137 | |
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| 138 | // Access parameters |
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| 139 | for (size_t i=0; i<=length; i++) { |
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| 140 | p.push_back(theBRparam->Parameter(i, Z, e)); |
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| 141 | } |
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| 142 | |
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| 143 | G4double x = AverageValue(t0, tm, p); |
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| 144 | G4double y = IntSpectrum(z0, 1.0, p); |
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| 145 | |
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| 146 | // Add integrant over lowest energies |
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| 147 | G4double zmin = tmin/e; |
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| 148 | if(zmin < t0) { |
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| 149 | G4double c = std::sqrt(theBRparam->ParameterC(Z)); |
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| 150 | x += p[0]*(t0 - zmin - c*(std::atan(t0/c) - std::atan(zmin/c))); |
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| 151 | } |
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| 152 | x *= e; |
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| 153 | |
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| 154 | if(1 < verbose) { |
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| 155 | G4cout << "tcut(MeV)= " << tmin/MeV |
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| 156 | << "; tMax(MeV)= " << tmax/MeV |
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| 157 | << "; e(MeV)= " << e/MeV |
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| 158 | << "; t0= " << t0 |
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| 159 | << "; tm= " << tm |
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| 160 | << "; y= " << y |
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| 161 | << "; x= " << x |
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| 162 | << G4endl; |
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| 163 | } |
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| 164 | p.clear(); |
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| 165 | |
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| 166 | if(y > 0.0) x /= y; |
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| 167 | else x = 0.0; |
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| 168 | // if(x < 0.0) x = 0.0; |
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| 169 | |
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| 170 | return x; |
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| 171 | } |
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| 172 | |
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| 173 | |
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| 174 | G4double G4eBremsstrahlungSpectrum::SampleEnergy(G4int Z, |
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| 175 | G4double tmin, |
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| 176 | G4double tmax, |
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| 177 | G4double e, |
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| 178 | G4int, |
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| 179 | const G4ParticleDefinition*) const |
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| 180 | { |
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| 181 | G4double tm = std::min(tmax, e); |
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| 182 | G4double t0 = std::max(tmin, lowestE); |
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| 183 | if(t0 >= tm) return 0.0; |
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| 184 | |
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| 185 | t0 /= e; |
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| 186 | tm /= e; |
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| 187 | |
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| 188 | G4DataVector p; |
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| 189 | |
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| 190 | for (size_t i=0; i<=length; i++) { |
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| 191 | p.push_back(theBRparam->Parameter(i, Z, e)); |
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| 192 | } |
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| 193 | G4double amaj = std::max(p[length], 1. - (p[1] - p[0])*xp[0]/(xp[1] - xp[0]) ); |
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| 194 | |
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| 195 | G4double amax = std::log(tm); |
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| 196 | G4double amin = std::log(t0); |
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| 197 | G4double tgam, q, fun; |
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| 198 | |
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| 199 | do { |
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| 200 | G4double x = amin + G4UniformRand()*(amax - amin); |
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| 201 | tgam = std::exp(x); |
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| 202 | fun = Function(tgam, p); |
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| 203 | |
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| 204 | if(fun > amaj) { |
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| 205 | G4cout << "WARNING in G4eBremsstrahlungSpectrum::SampleEnergy:" |
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| 206 | << " Majoranta " << amaj |
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| 207 | << " < " << fun |
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| 208 | << G4endl; |
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| 209 | } |
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| 210 | |
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| 211 | q = amaj * G4UniformRand(); |
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| 212 | } while (q > fun); |
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| 213 | |
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| 214 | tgam *= e; |
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| 215 | |
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| 216 | p.clear(); |
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| 217 | |
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| 218 | return tgam; |
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| 219 | } |
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| 220 | |
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| 221 | G4double G4eBremsstrahlungSpectrum::IntSpectrum(G4double xMin, |
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| 222 | G4double xMax, |
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| 223 | const G4DataVector& p) const |
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| 224 | { |
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| 225 | G4double x1 = std::min(xMin, xp[0]); |
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| 226 | G4double x2 = std::min(xMax, xp[0]); |
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| 227 | G4double sum = 0.0; |
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| 228 | |
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| 229 | if(x1 < x2) { |
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| 230 | G4double k = (p[1] - p[0])/(xp[1] - xp[0]); |
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| 231 | sum += (1. - k*xp[0])*std::log(x2/x1) + k*(x2 - x1); |
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| 232 | } |
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| 233 | |
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| 234 | for (size_t i=0; i<length-1; i++) { |
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| 235 | x1 = std::max(xMin, xp[i]); |
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| 236 | x2 = std::min(xMax, xp[i+1]); |
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| 237 | if(x1 < x2) { |
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| 238 | G4double z1 = p[i]; |
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| 239 | G4double z2 = p[i+1]; |
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| 240 | sum += z2 - z1 + std::log(x2/x1)*(z1*x2 - z2*x1)/(x2 - x1); |
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| 241 | } |
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| 242 | } |
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| 243 | if(sum < 0.0) sum = 0.0; |
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| 244 | return sum; |
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| 245 | } |
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| 246 | |
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| 247 | G4double G4eBremsstrahlungSpectrum::AverageValue(G4double xMin, |
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| 248 | G4double xMax, |
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| 249 | const G4DataVector& p) const |
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| 250 | { |
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| 251 | G4double x1 = std::min(xMin, xp[0]); |
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| 252 | G4double x2 = std::min(xMax, xp[0]); |
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| 253 | G4double z1 = x1; |
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| 254 | G4double z2 = x2; |
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| 255 | G4double sum = 0.0; |
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| 256 | |
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| 257 | if(x1 < x2) { |
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| 258 | G4double k = (p[1] - p[0])/(xp[1] - xp[0]); |
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| 259 | sum += (z2 - z1)*(1. - k*xp[0]); |
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| 260 | z1 *= x1; |
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| 261 | z2 *= x2; |
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| 262 | sum += 0.5*k*(z2 - z1); |
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| 263 | } |
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| 264 | |
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| 265 | for (size_t i=0; i<length-1; i++) { |
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| 266 | x1 = std::max(xMin, xp[i]); |
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| 267 | x2 = std::min(xMax, xp[i+1]); |
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| 268 | if(x1 < x2) { |
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| 269 | z1 = p[i]; |
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| 270 | z2 = p[i+1]; |
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| 271 | sum += 0.5*(z2 - z1)*(x2 + x1) + z1*x2 - z2*x1; |
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| 272 | } |
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| 273 | } |
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| 274 | if(sum < 0.0) sum = 0.0; |
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| 275 | return sum; |
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| 276 | } |
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| 277 | |
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| 278 | G4double G4eBremsstrahlungSpectrum::Function(G4double x, |
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| 279 | const G4DataVector& p) const |
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| 280 | { |
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| 281 | G4double f = 0.0; |
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| 282 | |
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| 283 | if(x <= xp[0]) { |
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| 284 | f = p[0] + (p[1] - p[0])*(x - xp[0])/(xp[1] - xp[0]); |
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| 285 | |
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| 286 | } else { |
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| 287 | |
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| 288 | for (size_t i=0; i<length-1; i++) { |
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| 289 | |
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| 290 | if(x <= xp[i+1]) { |
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| 291 | f = p[i] + (p[i+1] - p[i])*(x - xp[i])/(xp[i+1] - xp[i]); |
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| 292 | break; |
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| 293 | } |
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| 294 | } |
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| 295 | } |
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| 296 | return f; |
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| 297 | } |
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| 298 | |
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| 299 | void G4eBremsstrahlungSpectrum::PrintData() const |
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| 300 | { theBRparam->PrintData(); } |
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| 301 | |
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| 302 | G4double G4eBremsstrahlungSpectrum::Excitation(G4int , G4double ) const |
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| 303 | { |
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| 304 | return 0.0; |
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| 305 | } |
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| 306 | |
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| 307 | G4double G4eBremsstrahlungSpectrum::MaxEnergyOfSecondaries(G4double kineticEnergy, |
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| 308 | G4int, // Z, |
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| 309 | const G4ParticleDefinition*) const |
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| 310 | { |
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| 311 | return kineticEnergy; |
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| 312 | } |
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