[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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| 26 | // |
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| 27 | // $Id: G4CrossSectionChargeIncreasePartial.cc,v 1.1 2007/11/08 18:25:25 pia Exp $ |
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| 28 | // GEANT4 tag $Name: $ |
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| 29 | // |
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| 30 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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| 31 | // |
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| 32 | // Reference: TNS Geant4-DNA paper |
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| 33 | // Reference for implementation model: NIM. 155, pp. 145-156, 1978 |
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| 34 | |
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| 35 | // History: |
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| 36 | // ----------- |
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| 37 | // Date Name Modification |
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| 38 | // 28 Apr 2007 M.G. Pia Created in compliance with design described in TNS paper |
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| 39 | // |
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| 40 | // ------------------------------------------------------------------- |
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| 41 | |
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| 42 | // Class description: |
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| 43 | // Geant4-DNA Cross total cross section for electron elastic scattering in water |
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| 44 | // Reference: TNS Geant4-DNA paper |
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| 45 | // S. Chauvie et al., Geant4 physics processes for microdosimetry simulation: |
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| 46 | // design foundation and implementation of the first set of models, |
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| 47 | // IEEE Trans. Nucl. Sci., vol. 54, no. 6, Dec. 2007. |
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| 48 | // Further documentation available from http://www.ge.infn.it/geant4/dna |
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| 49 | |
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| 50 | // ------------------------------------------------------------------- |
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| 51 | |
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| 52 | |
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| 53 | #include "G4CrossSectionChargeIncreasePartial.hh" |
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| 54 | #include "G4DynamicParticle.hh" |
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| 55 | #include "G4ParticleDefinition.hh" |
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| 56 | #include "G4Proton.hh" |
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| 57 | #include "G4DNAGenericIonsManager.hh" |
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| 58 | |
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| 59 | #include "Randomize.hh" |
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| 60 | |
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| 61 | G4CrossSectionChargeIncreasePartial::G4CrossSectionChargeIncreasePartial() |
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| 62 | { |
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| 63 | |
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| 64 | //ALPHA+ |
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| 65 | f0[0][0]=1.; |
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| 66 | a0[0][0]=2.25; |
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| 67 | a1[0][0]=-0.75; |
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| 68 | b0[0][0]=-32.10; |
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| 69 | c0[0][0]=0.600; |
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| 70 | d0[0][0]=2.40; |
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| 71 | x0[0][0]=4.60; |
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| 72 | |
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| 73 | x1[0][0]=-1.; |
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| 74 | b1[0][0]=-1.; |
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| 75 | |
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| 76 | numberOfPartialCrossSections[0]=1; |
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| 77 | |
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| 78 | //HELIUM |
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| 79 | |
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| 80 | f0[0][1]=1.; |
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| 81 | a0[0][1]=2.25; |
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| 82 | a1[0][1]=-0.75; |
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| 83 | b0[0][1]=-30.93; |
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| 84 | c0[0][1]=0.590; |
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| 85 | d0[0][1]=2.35; |
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| 86 | x0[0][1]=4.29; |
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| 87 | |
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| 88 | f0[1][1]=1.; |
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| 89 | a0[1][1]=2.25; |
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| 90 | a1[1][1]=-0.75; |
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| 91 | b0[1][1]=-32.61; |
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| 92 | c0[1][1]=0.435; |
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| 93 | d0[1][1]=2.70; |
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| 94 | x0[1][1]=4.45; |
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| 95 | |
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| 96 | x1[0][1]=-1.; |
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| 97 | b1[0][1]=-1.; |
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| 98 | |
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| 99 | x1[1][1]=-1.; |
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| 100 | b1[1][1]=-1.; |
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| 101 | |
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| 102 | numberOfPartialCrossSections[1]=2; |
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| 103 | |
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| 104 | } |
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| 105 | |
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| 106 | G4CrossSectionChargeIncreasePartial::~G4CrossSectionChargeIncreasePartial() |
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| 107 | { } |
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| 108 | |
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| 109 | G4double G4CrossSectionChargeIncreasePartial::CrossSection(G4double k, G4int index, |
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| 110 | const G4ParticleDefinition* particleDefinition) |
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| 111 | { |
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| 112 | |
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| 113 | G4int particleTypeIndex = 0; |
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| 114 | G4DNAGenericIonsManager *instance; |
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| 115 | instance = G4DNAGenericIonsManager::Instance(); |
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| 116 | |
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| 117 | if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=0; |
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| 118 | if (particleDefinition == instance->GetIon("helium")) particleTypeIndex=1; |
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| 119 | |
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| 120 | // |
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| 121 | // sigma(T) = f0 10 ^ y(log10(T/eV)) |
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| 122 | // |
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| 123 | // / a0 x + b0 x < x0 |
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| 124 | // | |
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| 125 | // y(x) = < a0 x + b0 - c0 (x - x0)^d0 x0 <= x < x1 |
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| 126 | // | |
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| 127 | // \ a1 x + b1 x >= x1 |
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| 128 | // |
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| 129 | // |
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| 130 | // f0, a0, a1, b0, b1, c0, d0, x0, x1 are parameters that change for protons and helium (0, +, ++) |
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| 131 | // |
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| 132 | // f0 has been added to the code in order to manage partial (shell-dependent) cross sections (if no shell dependence is present. f0=1. Sum of f0 over the considered shells should give 1) |
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| 133 | // |
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| 134 | // From Rad. Phys. and Chem. 59 (2000) 255-275, M. Dingfelder et al. |
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| 135 | // Inelastic-collision cross sections of liquid water for interactions of energetic proton |
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| 136 | // |
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| 137 | |
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| 138 | if (x1[index][particleTypeIndex]<x0[index][particleTypeIndex]) |
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| 139 | { |
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| 140 | // |
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| 141 | // if x1 < x0 means that x1 and b1 will be calculated with the following formula (this piece of code is run on all alphas and not on protons) |
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| 142 | // |
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| 143 | // x1 = x0 + ((a0 - a1)/(c0 * d0)) ^ (1 / (d0 - 1)) |
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| 144 | // |
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| 145 | // b1 = (a0 - a1) * x1 + b0 - c0 * (x1 - x0) ^ d0 |
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| 146 | // |
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| 147 | |
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| 148 | x1[index][particleTypeIndex]=x0[index][particleTypeIndex] + std::pow((a0[index][particleTypeIndex] - a1[index][particleTypeIndex]) / (c0[index][particleTypeIndex] * d0[index][particleTypeIndex]), 1. / (d0[index][particleTypeIndex] - 1.)); |
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| 149 | b1[index][particleTypeIndex]=(a0[index][particleTypeIndex] - a1[index][particleTypeIndex]) * x1[index][particleTypeIndex] + b0[index][particleTypeIndex] - c0[index][particleTypeIndex] * std::pow(x1[index][particleTypeIndex] - x0[index][particleTypeIndex], d0[index][particleTypeIndex]); |
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| 150 | } |
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| 151 | |
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| 152 | G4double x(std::log10(k/eV)); |
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| 153 | G4double y; |
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| 154 | |
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| 155 | if (x<x0[index][particleTypeIndex]) |
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| 156 | y=a0[index][particleTypeIndex] * x + b0[index][particleTypeIndex]; |
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| 157 | else if (x<x1[index][particleTypeIndex]) |
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| 158 | y=a0[index][particleTypeIndex] * x + b0[index][particleTypeIndex] - c0[index][particleTypeIndex] * std::pow(x - x0[index][particleTypeIndex], d0[index][particleTypeIndex]); |
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| 159 | else |
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| 160 | y=a1[index][particleTypeIndex] * x + b1[index][particleTypeIndex]; |
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| 161 | |
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| 162 | return f0[index][particleTypeIndex] * std::pow(10., y)*m*m; |
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| 163 | |
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| 164 | |
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| 165 | } |
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| 166 | |
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| 167 | G4int G4CrossSectionChargeIncreasePartial::RandomSelect(G4double k, |
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| 168 | const G4ParticleDefinition* particleDefinition) |
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| 169 | { |
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| 170 | |
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| 171 | G4int particleTypeIndex = 0; |
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| 172 | G4DNAGenericIonsManager *instance; |
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| 173 | instance = G4DNAGenericIonsManager::Instance(); |
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| 174 | |
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| 175 | if (particleDefinition == instance->GetIon("hydrogen")) return 0; |
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| 176 | if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=0; |
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| 177 | if (particleDefinition == instance->GetIon("helium")) particleTypeIndex=1; |
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| 178 | |
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| 179 | const G4int n = numberOfPartialCrossSections[particleTypeIndex]; |
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| 180 | G4double* values(new G4double[n]); |
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| 181 | G4double value = 0; |
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| 182 | G4int i = n; |
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| 183 | |
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| 184 | while (i>0) |
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| 185 | { |
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| 186 | i--; |
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| 187 | values[i]=CrossSection(k, i, particleDefinition); |
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| 188 | value+=values[i]; |
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| 189 | } |
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| 190 | |
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| 191 | value*=G4UniformRand(); |
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| 192 | |
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| 193 | i=n; |
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| 194 | while (i>0) |
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| 195 | { |
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| 196 | i--; |
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| 197 | |
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| 198 | if (values[i]>value) |
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| 199 | break; |
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| 200 | |
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| 201 | value-=values[i]; |
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| 202 | } |
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| 203 | |
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| 204 | delete[] values; |
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| 205 | |
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| 206 | return i; |
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| 207 | } |
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| 208 | |
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| 209 | G4double G4CrossSectionChargeIncreasePartial::Sum(G4double k, const G4ParticleDefinition* particleDefinition) |
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| 210 | { |
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| 211 | G4int particleTypeIndex = 0; |
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| 212 | G4DNAGenericIonsManager *instance; |
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| 213 | instance = G4DNAGenericIonsManager::Instance(); |
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| 214 | |
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| 215 | if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=0; |
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| 216 | if (particleDefinition == instance->GetIon("helium")) particleTypeIndex=1; |
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| 217 | |
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| 218 | G4double totalCrossSection = 0.; |
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| 219 | |
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| 220 | for (G4int i=0; i<numberOfPartialCrossSections[particleTypeIndex]; i++) |
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| 221 | { |
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| 222 | totalCrossSection += CrossSection(k,i,particleDefinition); |
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| 223 | } |
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| 224 | return totalCrossSection; |
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| 225 | } |
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| 226 | |
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| 227 | |
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