[968] | 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 | // $Id: G4EmSaturation.cc,v 1.9 2008/11/12 15:37:33 vnivanch Exp $ |
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[1007] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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[968] | 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: G4EmSaturation |
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| 35 | // |
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| 36 | // Author: Vladimir Ivanchenko |
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| 37 | // |
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| 38 | // Creation date: 18.02.2008 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // ------------------------------------------------------------- |
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| 43 | |
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| 44 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 45 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 46 | |
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| 47 | #include "G4EmSaturation.hh" |
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| 48 | #include "G4Gamma.hh" |
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| 49 | #include "G4Electron.hh" |
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| 50 | #include "G4Neutron.hh" |
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| 51 | #include "G4Proton.hh" |
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| 52 | #include "G4LossTableManager.hh" |
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| 53 | #include "G4NistManager.hh" |
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| 54 | #include "G4Material.hh" |
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| 55 | #include "G4MaterialCutsCouple.hh" |
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| 56 | |
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| 57 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 58 | |
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| 59 | G4EmSaturation::G4EmSaturation() |
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| 60 | { |
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| 61 | verbose = 1; |
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| 62 | manager = 0; |
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| 63 | curMaterial = 0; |
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| 64 | curBirks = 0.0; |
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| 65 | curRatio = 1.0; |
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| 66 | curChargeSq = 1.0; |
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| 67 | nMaterials = 0; |
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| 68 | Initialise(); |
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| 69 | } |
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| 70 | |
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| 71 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 72 | |
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| 73 | G4EmSaturation::~G4EmSaturation() |
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| 74 | {} |
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| 75 | |
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| 76 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 77 | |
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| 78 | G4double G4EmSaturation::VisibleEnergyDeposition( |
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| 79 | const G4ParticleDefinition* p, |
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| 80 | const G4MaterialCutsCouple* couple, |
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| 81 | G4double length, |
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| 82 | G4double edep, |
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| 83 | G4double niel) |
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| 84 | { |
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| 85 | if(edep <= 0.0) return 0.0; |
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| 86 | |
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| 87 | G4double evis = edep; |
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| 88 | G4double bfactor = FindBirksCoefficient(couple->GetMaterial()); |
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| 89 | |
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| 90 | if(bfactor > 0.0) { |
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| 91 | |
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| 92 | // atomic relaxations |
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| 93 | if(p == gamma) { |
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| 94 | evis /= (1.0 + bfactor*edep/manager->GetRange(electron,edep,couple)); |
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| 95 | |
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| 96 | // energy loss |
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| 97 | } else { |
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| 98 | |
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| 99 | // protections |
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| 100 | G4double nloss = niel; |
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| 101 | if(nloss < 0.0) nloss = 0.0; |
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| 102 | G4double eloss = edep - nloss; |
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| 103 | if(p == neutron || eloss < 0.0 || length <= 0.0) { |
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| 104 | nloss = edep; |
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| 105 | eloss = 0.0; |
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| 106 | } |
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| 107 | |
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| 108 | // continues energy loss |
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| 109 | if(eloss > 0.0) eloss /= (1.0 + bfactor*eloss/length); |
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| 110 | |
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| 111 | // non-ionizing energy loss |
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| 112 | if(nloss > 0.0) { |
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| 113 | G4double escaled = nloss*curRatio; |
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| 114 | G4double s = manager->GetRange(proton,escaled,couple)/curChargeSq; |
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| 115 | nloss /= (1.0 + bfactor*nloss/s); |
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| 116 | } |
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| 117 | |
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| 118 | evis = eloss + nloss; |
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| 119 | } |
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| 120 | } |
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| 121 | |
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| 122 | return evis; |
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| 123 | } |
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| 124 | |
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| 125 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 126 | |
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| 127 | G4double G4EmSaturation::FindG4BirksCoefficient(const G4Material* mat) |
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| 128 | { |
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| 129 | G4String name = mat->GetName(); |
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| 130 | // is this material in the vector? |
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| 131 | |
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| 132 | for(G4int j=0; j<nG4Birks; j++) { |
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| 133 | if(name == g4MatNames[j]) { |
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| 134 | if(verbose > 0) |
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| 135 | G4cout << "### G4EmSaturation::FindG4BirksCoefficient for " |
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| 136 | << name << " is " << g4MatData[j]*MeV/mm << " mm/MeV " |
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| 137 | << G4endl; |
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| 138 | return g4MatData[j]; |
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| 139 | } |
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| 140 | } |
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| 141 | return FindBirksCoefficient(mat); |
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| 142 | } |
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| 143 | |
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| 144 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 145 | |
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| 146 | G4double G4EmSaturation::FindBirksCoefficient(const G4Material* mat) |
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| 147 | { |
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| 148 | if(mat == curMaterial) return curBirks; |
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| 149 | |
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| 150 | curMaterial = mat; |
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| 151 | curBirks = 0.0; |
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| 152 | curRatio = 1.0; |
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| 153 | curChargeSq = 1.0; |
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| 154 | |
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| 155 | // seach in the run-time list |
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| 156 | for(G4int i=0; i<nMaterials; i++) { |
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| 157 | if(mat == matPointers[i]) { |
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| 158 | curBirks = mat->GetIonisation()->GetBirksConstant(); |
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| 159 | curRatio = massFactors[i]; |
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| 160 | curChargeSq = effCharges[i]; |
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| 161 | return curBirks; |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | if(!manager) { |
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| 166 | manager = G4LossTableManager::Instance(); |
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| 167 | nist = G4NistManager::Instance(); |
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| 168 | gamma = G4Gamma::Gamma(); |
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| 169 | electron= G4Electron::Electron(); |
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| 170 | proton = G4Proton::Proton(); |
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| 171 | neutron = G4Neutron::Neutron(); |
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| 172 | } |
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| 173 | |
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| 174 | G4String name = mat->GetName(); |
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| 175 | curBirks = mat->GetIonisation()->GetBirksConstant(); |
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| 176 | |
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| 177 | // material has no Birks coeffitient defined |
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| 178 | // seach in the Geant4 list |
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| 179 | if(curBirks == 0.0) { |
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| 180 | for(G4int j=0; j<nG4Birks; j++) { |
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| 181 | if(name == g4MatNames[j]) { |
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| 182 | mat->GetIonisation()->SetBirksConstant(g4MatData[j]); |
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| 183 | curBirks = g4MatData[j]; |
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| 184 | break; |
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| 185 | } |
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| 186 | } |
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| 187 | } |
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| 188 | |
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| 189 | if(curBirks == 0.0 && verbose > 0) { |
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| 190 | G4cout << "### G4EmSaturation::FindBirksCoefficient fails " |
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| 191 | " for material " << name << G4endl; |
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| 192 | } |
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| 193 | |
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| 194 | // compute mean mass ratio |
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| 195 | curRatio = 0.0; |
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| 196 | curChargeSq = 0.0; |
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| 197 | G4double norm = 0.0; |
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| 198 | const G4ElementVector* theElementVector = mat->GetElementVector(); |
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| 199 | const G4double* theAtomNumDensityVector = mat->GetVecNbOfAtomsPerVolume(); |
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| 200 | size_t nelm = mat->GetNumberOfElements(); |
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| 201 | for (size_t i=0; i<nelm; i++) { |
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| 202 | const G4Element* elm = (*theElementVector)[i]; |
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| 203 | G4double Z = elm->GetZ(); |
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| 204 | G4double w = Z*Z*theAtomNumDensityVector[i]; |
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| 205 | curRatio += w/nist->GetAtomicMassAmu(G4int(Z)); |
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| 206 | curChargeSq = Z*Z*w; |
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| 207 | norm += w; |
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| 208 | } |
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| 209 | curRatio *= proton_mass_c2/norm; |
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| 210 | curChargeSq /= norm; |
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| 211 | |
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| 212 | // store results |
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| 213 | matPointers.push_back(mat); |
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| 214 | matNames.push_back(name); |
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| 215 | massFactors.push_back(curRatio); |
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| 216 | effCharges.push_back(curChargeSq); |
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| 217 | nMaterials++; |
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| 218 | if(curBirks > 0.0 && verbose > 0) { |
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| 219 | G4cout << "### G4EmSaturation::FindBirksCoefficient Birks coefficient for " |
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| 220 | << name << " " << curBirks*MeV/mm << " mm/MeV" << G4endl; |
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| 221 | } |
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| 222 | return curBirks; |
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| 223 | } |
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| 224 | |
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| 225 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 226 | |
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| 227 | void G4EmSaturation::DumpBirksCoefficients() |
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| 228 | { |
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| 229 | if(nMaterials > 0) { |
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| 230 | G4cout << "### Birks coeffitients used in run time" << G4endl; |
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| 231 | for(G4int i=0; i<nMaterials; i++) { |
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| 232 | G4double br = matPointers[i]->GetIonisation()->GetBirksConstant(); |
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| 233 | G4cout << " " << matNames[i] << " " |
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| 234 | << br*MeV/mm << " mm/MeV" << " " |
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| 235 | << br*matPointers[i]->GetDensity()*MeV*cm2/g |
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| 236 | << " g/cm^2/MeV" |
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| 237 | << G4endl; |
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| 238 | } |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 243 | |
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| 244 | void G4EmSaturation::DumpG4BirksCoefficients() |
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| 245 | { |
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| 246 | if(nG4Birks > 0) { |
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| 247 | G4cout << "### Birks coeffitients for Geant4 materials" << G4endl; |
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| 248 | for(G4int i=0; i<nG4Birks; i++) { |
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| 249 | G4cout << " " << g4MatNames[i] << " " |
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| 250 | << g4MatData[i]*MeV/mm << " mm/MeV" << G4endl; |
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| 251 | } |
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| 252 | } |
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| 253 | } |
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| 254 | |
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| 255 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 256 | |
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| 257 | void G4EmSaturation::Initialise() |
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| 258 | { |
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| 259 | // M.Hirschberg et al., IEEE Trans. Nuc. Sci. 39 (1992) 511 |
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| 260 | // SCSN-38 kB = 0.00842 g/cm^2/MeV; rho = 1.06 g/cm^3 |
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| 261 | g4MatNames.push_back("G4_POLYSTYRENE"); |
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| 262 | g4MatData.push_back(0.07943*mm/MeV); |
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| 263 | |
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| 264 | // C.Fabjan (private communication) |
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| 265 | // kB = 0.006 g/cm^2/MeV; rho = 7.13 g/cm^3 |
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| 266 | g4MatNames.push_back("G4_BGO"); |
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| 267 | g4MatData.push_back(0.008415*mm/MeV); |
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| 268 | |
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| 269 | // A.Ribon analysis of publications |
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| 270 | // Scallettar et al., Phys. Rev. A25 (1982) 2419. |
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| 271 | // NIM A 523 (2004) 275. |
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| 272 | // kB = 0.022 g/cm^2/MeV; rho = 1.396 g/cm^3; |
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| 273 | // ATLAS Efield = 10 kV/cm provide the strongest effect |
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| 274 | g4MatNames.push_back("G4_lAr"); |
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| 275 | g4MatData.push_back(0.1576*mm/MeV); |
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| 276 | |
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| 277 | //G4_BARIUM_FLUORIDE |
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| 278 | //G4_CESIUM_IODIDE |
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| 279 | //G4_GEL_PHOTO_EMULSION |
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| 280 | //G4_PHOTO_EMULSION |
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| 281 | //G4_PLASTIC_SC_VINYLTOLUENE |
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| 282 | //G4_SODIUM_IODIDE |
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| 283 | //G4_STILBENE |
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| 284 | //G4_lAr |
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| 285 | //G4_PbWO4 |
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| 286 | //G4_Lucite |
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| 287 | |
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| 288 | nG4Birks = g4MatData.size(); |
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| 289 | } |
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| 290 | |
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| 291 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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