[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: G4CrossSectionChargeIncrease.cc,v 1.3 2007/12/10 16:31:21 gunter 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 "G4CrossSectionChargeIncrease.hh" |
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| 54 | #include "G4Track.hh" |
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| 55 | #include "G4DynamicParticle.hh" |
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| 56 | #include "G4ParticleDefinition.hh" |
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| 57 | #include "G4DNAGenericIonsManager.hh" |
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| 58 | |
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| 59 | G4CrossSectionChargeIncrease::G4CrossSectionChargeIncrease() |
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| 60 | { |
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| 61 | // Default energy limits (defined for protection against anomalous behaviour only) |
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| 62 | name = "ChargeIncrease"; |
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| 63 | lowEnergyLimitDefault = 1 * keV; |
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| 64 | highEnergyLimitDefault = 10 * MeV; |
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| 65 | |
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| 66 | G4DNAGenericIonsManager *instance; |
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| 67 | instance = G4DNAGenericIonsManager::Instance(); |
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| 68 | G4ParticleDefinition* hydrogenDef = instance->GetIon("hydrogen"); |
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| 69 | G4ParticleDefinition* alphaPlusDef = instance->GetIon("alpha+"); |
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| 70 | G4ParticleDefinition* heliumDef = instance->GetIon("helium"); |
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| 71 | |
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| 72 | G4String hydrogen; |
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| 73 | G4String alphaPlus; |
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| 74 | G4String helium; |
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| 75 | |
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| 76 | if (hydrogenDef != 0) |
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| 77 | { |
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| 78 | hydrogen = hydrogenDef->GetParticleName(); |
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| 79 | lowEnergyLimit[hydrogen] = 1. * keV; |
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| 80 | highEnergyLimit[hydrogen] = 10. * MeV; |
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| 81 | } |
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| 82 | else |
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| 83 | { |
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| 84 | G4Exception("G4CrossSectionChargeIncrease Constructor: hydrogen is not defined"); |
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| 85 | } |
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| 86 | |
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| 87 | if (alphaPlusDef != 0) |
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| 88 | { |
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| 89 | alphaPlus = alphaPlusDef->GetParticleName(); |
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| 90 | lowEnergyLimit[alphaPlus] = 1. * keV; |
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| 91 | highEnergyLimit[alphaPlus] = 10. * MeV; |
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| 92 | } |
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| 93 | else |
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| 94 | { |
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| 95 | G4Exception("G4CrossSectionChargeIncrease Constructor: alphaPlus is not defined"); |
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| 96 | } |
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| 97 | |
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| 98 | if (heliumDef != 0) |
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| 99 | { |
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| 100 | helium = heliumDef->GetParticleName(); |
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| 101 | lowEnergyLimit[helium] = 1. * keV; |
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| 102 | highEnergyLimit[helium] = 10. * MeV; |
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| 103 | } |
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| 104 | else |
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| 105 | { |
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| 106 | G4Exception("G4CrossSectionChargeIncrease Constructor: helium is not defined"); |
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| 107 | } |
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| 108 | |
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| 109 | } |
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| 110 | |
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| 111 | |
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| 112 | G4CrossSectionChargeIncrease::~G4CrossSectionChargeIncrease() |
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| 113 | {} |
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| 114 | |
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| 115 | |
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| 116 | G4double G4CrossSectionChargeIncrease::CrossSection(const G4Track& track) |
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| 117 | { |
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| 118 | G4double lowLim = lowEnergyLimitDefault; |
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| 119 | G4double highLim = highEnergyLimitDefault; |
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| 120 | |
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| 121 | const G4DynamicParticle* particle = track.GetDynamicParticle(); |
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| 122 | G4double k = particle->GetKineticEnergy(); |
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| 123 | |
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| 124 | const G4String& particleName = particle->GetDefinition()->GetParticleName(); |
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| 125 | |
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| 126 | G4DNAGenericIonsManager *instance; |
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| 127 | instance = G4DNAGenericIonsManager::Instance(); |
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| 128 | |
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| 129 | const G4ParticleDefinition* particleDefinition = track.GetDefinition(); |
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| 130 | |
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| 131 | if ( |
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| 132 | particleDefinition != instance->GetIon("hydrogen") |
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| 133 | && |
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| 134 | particleDefinition != instance->GetIon("alpha+") |
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| 135 | && |
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| 136 | particleDefinition != instance->GetIon("helium") |
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| 137 | ) |
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| 138 | |
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| 139 | G4Exception("G4CrossSectionChargeIncrease: attempting to calculate cross section for wrong particle"); |
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| 140 | |
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| 141 | |
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| 142 | // Retrieve energy limits for the current particle type |
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| 143 | |
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| 144 | std::map< G4String,G4double,std::less<G4String> >::iterator pos1; |
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| 145 | pos1 = lowEnergyLimit.find(particleName); |
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| 146 | |
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| 147 | // Lower limit |
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| 148 | if (pos1 != lowEnergyLimit.end()) |
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| 149 | { |
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| 150 | lowLim = pos1->second; |
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| 151 | } |
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| 152 | |
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| 153 | // Upper limit |
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| 154 | std::map< G4String,G4double,std::less<G4String> >::iterator pos2; |
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| 155 | pos2 = highEnergyLimit.find(particleName); |
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| 156 | |
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| 157 | if (pos2 != highEnergyLimit.end()) |
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| 158 | { |
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| 159 | highLim = pos2->second; |
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| 160 | } |
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| 161 | |
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| 162 | G4double totalCrossSection = 0.; |
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| 163 | |
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| 164 | if (k >= lowLim && k <= highLim) |
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| 165 | { |
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| 166 | //HYDROGEN |
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| 167 | if (particleDefinition == instance->GetIon("hydrogen")) |
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| 168 | { |
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| 169 | const G4double aa = 2.835; |
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| 170 | const G4double bb = 0.310; |
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| 171 | const G4double cc = 2.100; |
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| 172 | const G4double dd = 0.760; |
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| 173 | const G4double fac = 1.0e-18; |
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| 174 | const G4double rr = 13.606 * eV; |
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| 175 | |
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| 176 | G4double t = k / (proton_mass_c2/electron_mass_c2); |
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| 177 | G4double x = t / rr; |
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| 178 | G4double temp = 4.0 * pi * Bohr_radius/nm * Bohr_radius/nm * fac; |
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| 179 | G4double sigmal = temp * cc * (std::pow(x,dd)); |
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| 180 | G4double sigmah = temp * (aa * std::log(1.0 + x) + bb) / x; |
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| 181 | totalCrossSection = 1.0/(1.0/sigmal + 1.0/sigmah) *m*m; |
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| 182 | } |
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| 183 | else |
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| 184 | { |
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| 185 | totalCrossSection = partialCrossSection.Sum(k,particleDefinition); |
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| 186 | } |
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| 187 | } |
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| 188 | |
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| 189 | return totalCrossSection; |
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| 190 | } |
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| 191 | |
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