[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 | // |
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| 27 | // |
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| 28 | // =========================================================================== |
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| 29 | // GEANT4 class source file |
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| 30 | // |
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| 31 | // Class: G4IonParametrisedLossModel |
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| 32 | // |
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| 33 | // Base class: G4VEmModel (utils) |
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| 34 | // |
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| 35 | // Author: Anton Lechner (Anton.Lechner@cern.ch) |
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| 36 | // |
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| 37 | // First implementation: 10. 11. 2008 |
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| 38 | // |
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[1055] | 39 | // Modifications: 03. 02. 2009 - Bug fix iterators (AL) |
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| 40 | // 11. 03. 2009 - Introduced new table handler (G4IonDEDXHandler) |
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| 41 | // and modified method to add/remove tables |
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| 42 | // (tables are now built in initialisation phase), |
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| 43 | // Minor bug fix in ComputeDEDXPerVolume (AL) |
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| 44 | // 11. 05. 2009 - Introduced scaling algorithm for heavier ions: |
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| 45 | // G4IonDEDXScalingICRU73 (AL) |
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[968] | 46 | // |
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| 47 | // Class description: |
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| 48 | // Model for computing the energy loss of ions by employing a |
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| 49 | // parameterisation of dE/dx tables (by default ICRU 73 tables). For |
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| 50 | // ion-material combinations and/or projectile energies not covered |
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| 51 | // by this model, the G4BraggIonModel and G4BetheBloch models are |
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| 52 | // employed. |
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| 53 | // |
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| 54 | // Comments: |
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| 55 | // |
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| 56 | // =========================================================================== |
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| 57 | |
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| 58 | |
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| 59 | #include "G4IonParametrisedLossModel.hh" |
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| 60 | #include "G4MaterialStoppingICRU73.hh" |
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| 61 | #include "G4SimpleMaterialStoppingICRU73.hh" |
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[1055] | 62 | #include "G4IronStoppingICRU73.hh" |
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| 63 | #include "G4VIonDEDXTable.hh" |
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| 64 | #include "G4VIonDEDXScalingAlgorithm.hh" |
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| 65 | #include "G4IonDEDXScalingICRU73.hh" |
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[968] | 66 | #include "G4BraggIonModel.hh" |
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| 67 | #include "G4BetheBlochModel.hh" |
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[1055] | 68 | #include "G4ProductionCutsTable.hh" |
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[968] | 69 | #include "G4ParticleChangeForLoss.hh" |
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| 70 | #include "G4LossTableManager.hh" |
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| 71 | #include "G4GenericIon.hh" |
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| 72 | #include "G4Electron.hh" |
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| 73 | #include "Randomize.hh" |
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| 74 | |
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[1055] | 75 | //#define PRINT_TABLE_BUILT |
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[968] | 76 | |
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[1055] | 77 | |
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| 78 | // ######################################################################### |
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| 79 | |
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[968] | 80 | G4IonParametrisedLossModel::G4IonParametrisedLossModel( |
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| 81 | const G4ParticleDefinition*, |
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| 82 | const G4String& name) |
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| 83 | : G4VEmModel(name), |
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| 84 | braggIonModel(0), |
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| 85 | betheBlochModel(0), |
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| 86 | nmbBins(90), |
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| 87 | nmbSubBins(100), |
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| 88 | particleChangeLoss(0), |
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| 89 | modelIsInitialised(false), |
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| 90 | corrections(0), |
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| 91 | corrFactor(1.0), |
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| 92 | energyLossLimit(0.15), |
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| 93 | cutEnergies(0) { |
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| 94 | |
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| 95 | genericIon = G4GenericIon::Definition(); |
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| 96 | genericIonPDGMass = genericIon -> GetPDGMass(); |
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| 97 | |
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| 98 | // The upper limit of the current model is set to 100 TeV |
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| 99 | SetHighEnergyLimit(100.0 * TeV); |
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| 100 | |
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| 101 | // The Bragg ion and Bethe Bloch models are instantiated |
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| 102 | braggIonModel = new G4BraggIonModel(); |
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| 103 | betheBlochModel = new G4BetheBlochModel(); |
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| 104 | |
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[1055] | 105 | // By default ICRU 73 stopping power tables are loaded: |
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[968] | 106 | |
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[1055] | 107 | // Ions with Z above between 19 and 21: Ar-40 data is used as basis |
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| 108 | // for stopping power scaling |
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| 109 | G4int ionZMin = 19; |
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| 110 | G4int ionZMax = 21; |
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| 111 | G4int refIonZ = 18; |
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| 112 | G4int refIonA = 40; |
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| 113 | |
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| 114 | AddDEDXTable("ICRU73-elemmat", |
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| 115 | new G4SimpleMaterialStoppingICRU73, |
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| 116 | new G4IonDEDXScalingICRU73(ionZMin, ionZMax, refIonZ, refIonA)); |
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| 117 | |
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| 118 | // Ions with Z above 21: Fe-56 data is used as basis for stopping power |
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| 119 | // scaling |
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| 120 | ionZMin = 22; |
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| 121 | ionZMax = 102; |
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| 122 | refIonZ = 26; |
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| 123 | refIonA = 56; |
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| 124 | |
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| 125 | AddDEDXTable("ICRU73-ironions", |
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| 126 | new G4IronStoppingICRU73, |
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| 127 | new G4IonDEDXScalingICRU73(ionZMin, ionZMax, refIonZ, refIonA)); |
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| 128 | |
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| 129 | // Compound materials: Ar-40 data is used as basis for stopping power |
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| 130 | // scaling (except for iron ions) |
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| 131 | ionZMin = 19; |
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| 132 | ionZMax = 102; |
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| 133 | refIonZ = 18; |
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| 134 | refIonA = 40; |
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| 135 | |
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| 136 | G4IonDEDXScalingICRU73* scaling = |
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| 137 | new G4IonDEDXScalingICRU73(ionZMin, ionZMax, refIonZ, refIonA); |
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| 138 | |
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| 139 | G4int ironIonAtomicNumber = 26; |
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| 140 | scaling -> AddException(ironIonAtomicNumber); |
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| 141 | |
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| 142 | AddDEDXTable("ICRU73-compmat", |
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| 143 | new G4MaterialStoppingICRU73, |
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| 144 | scaling); |
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| 145 | |
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[968] | 146 | // The boundaries for the range tables are set |
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| 147 | lowerEnergyEdgeIntegr = 0.025 * MeV; |
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| 148 | upperEnergyEdgeIntegr = betheBlochModel -> HighEnergyLimit(); |
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| 149 | |
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| 150 | // Cached parameters are reset |
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| 151 | cacheParticle = 0; |
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| 152 | cacheMass = 0; |
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| 153 | cacheElecMassRatio = 0; |
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| 154 | cacheChargeSquare = 0; |
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| 155 | |
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| 156 | // Cached parameters are reset |
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| 157 | dedxCacheParticle = 0; |
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| 158 | dedxCacheMaterial = 0; |
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| 159 | dedxCacheEnergyCut = 0; |
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[1055] | 160 | dedxCacheIter = lossTableList.end(); |
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[968] | 161 | dedxCacheTransitionEnergy = 0.0; |
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| 162 | dedxCacheTransitionFactor = 0.0; |
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| 163 | dedxCacheGenIonMassRatio = 0.0; |
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| 164 | } |
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| 165 | |
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[1055] | 166 | // ######################################################################### |
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[968] | 167 | |
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| 168 | G4IonParametrisedLossModel::~G4IonParametrisedLossModel() { |
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| 169 | |
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| 170 | // Range vs energy table objects are deleted and the container is cleared |
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| 171 | RangeEnergyTable::iterator iterRange = r.begin(); |
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| 172 | RangeEnergyTable::iterator iterRange_end = r.end(); |
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| 173 | |
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| 174 | for(;iterRange != iterRange_end; iterRange++) delete iterRange -> second; |
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| 175 | r.clear(); |
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| 176 | |
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| 177 | // Energy vs range table objects are deleted and the container is cleared |
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| 178 | EnergyRangeTable::iterator iterEnergy = E.begin(); |
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| 179 | EnergyRangeTable::iterator iterEnergy_end = E.end(); |
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| 180 | |
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| 181 | for(;iterEnergy != iterEnergy_end; iterEnergy++) delete iterEnergy -> second; |
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| 182 | E.clear(); |
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| 183 | |
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| 184 | // dE/dx table objects are deleted and the container is cleared |
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| 185 | LossTableList::iterator iterTables = lossTableList.begin(); |
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| 186 | LossTableList::iterator iterTables_end = lossTableList.end(); |
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| 187 | |
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| 188 | for(;iterTables != iterTables_end; iterTables++) delete *iterTables; |
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| 189 | lossTableList.clear(); |
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| 190 | |
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| 191 | // The Bragg ion and Bethe Bloch objects are deleted |
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| 192 | delete betheBlochModel; |
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| 193 | delete braggIonModel; |
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| 194 | } |
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| 195 | |
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[1055] | 196 | // ######################################################################### |
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[968] | 197 | |
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| 198 | G4double G4IonParametrisedLossModel::MinEnergyCut( |
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| 199 | const G4ParticleDefinition*, |
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| 200 | const G4MaterialCutsCouple* couple) { |
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| 201 | |
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| 202 | return couple -> GetMaterial() -> GetIonisation() -> |
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| 203 | GetMeanExcitationEnergy(); |
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| 204 | } |
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| 205 | |
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[1055] | 206 | // ######################################################################### |
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[968] | 207 | |
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| 208 | void G4IonParametrisedLossModel::Initialise( |
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| 209 | const G4ParticleDefinition* particle, |
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| 210 | const G4DataVector& cuts) { |
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| 211 | |
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| 212 | // Cached parameters are reset |
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| 213 | cacheParticle = 0; |
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| 214 | cacheMass = 0; |
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| 215 | cacheElecMassRatio = 0; |
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| 216 | cacheChargeSquare = 0; |
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| 217 | |
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| 218 | // Cached parameters are reset |
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| 219 | dedxCacheParticle = 0; |
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| 220 | dedxCacheMaterial = 0; |
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| 221 | dedxCacheEnergyCut = 0; |
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[1055] | 222 | dedxCacheIter = lossTableList.end(); |
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[968] | 223 | dedxCacheTransitionEnergy = 0.0; |
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| 224 | dedxCacheTransitionFactor = 0.0; |
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| 225 | dedxCacheGenIonMassRatio = 0.0; |
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| 226 | |
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| 227 | // The cache of loss tables is cleared |
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| 228 | LossTableList::iterator iterTables = lossTableList.begin(); |
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| 229 | LossTableList::iterator iterTables_end = lossTableList.end(); |
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| 230 | |
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| 231 | for(;iterTables != iterTables_end; iterTables++) |
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| 232 | (*iterTables) -> ClearCache(); |
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| 233 | |
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| 234 | // Range vs energy and energy vs range vectors from previous runs are |
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| 235 | // cleared |
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| 236 | RangeEnergyTable::iterator iterRange = r.begin(); |
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| 237 | RangeEnergyTable::iterator iterRange_end = r.end(); |
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| 238 | |
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| 239 | for(;iterRange != iterRange_end; iterRange++) delete iterRange -> second; |
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| 240 | r.clear(); |
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| 241 | |
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| 242 | EnergyRangeTable::iterator iterEnergy = E.begin(); |
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| 243 | EnergyRangeTable::iterator iterEnergy_end = E.end(); |
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| 244 | |
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| 245 | for(;iterEnergy != iterEnergy_end; iterEnergy++) delete iterEnergy -> second; |
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| 246 | E.clear(); |
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| 247 | |
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| 248 | // The cut energies are (re)loaded |
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| 249 | size_t size = cuts.size(); |
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| 250 | cutEnergies.clear(); |
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| 251 | for(size_t i = 0; i < size; i++) cutEnergies.push_back(cuts[i]); |
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| 252 | |
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[1055] | 253 | // All dE/dx vectors are built |
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| 254 | const G4ProductionCutsTable* coupleTable= |
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| 255 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 256 | size_t nmbCouples = coupleTable -> GetTableSize(); |
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| 257 | |
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| 258 | #ifdef PRINT_TABLE_BUILT |
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| 259 | G4cout << "G4IonParametrisedLossModel::Initialise():" |
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| 260 | << " Building dE/dx vectors:" |
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| 261 | << G4endl; |
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| 262 | #endif |
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| 263 | |
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| 264 | for (size_t i = 0; i < nmbCouples; i++) { |
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| 265 | |
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| 266 | const G4MaterialCutsCouple* couple = |
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| 267 | coupleTable -> GetMaterialCutsCouple(i); |
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| 268 | |
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| 269 | const G4Material* material = couple -> GetMaterial(); |
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| 270 | // G4ProductionCuts* productionCuts = couple -> GetProductionCuts(); |
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| 271 | |
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| 272 | for(G4int atomicNumberIon = 3; atomicNumberIon < 102; atomicNumberIon++) { |
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| 273 | |
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| 274 | LossTableList::iterator iter = lossTableList.begin(); |
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| 275 | LossTableList::iterator iter_end = lossTableList.end(); |
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| 276 | |
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| 277 | for(;iter != iter_end; iter++) { |
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| 278 | |
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| 279 | if(*iter == 0) { |
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| 280 | G4cout << "G4IonParametrisedLossModel::Initialise():" |
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| 281 | << " Skipping illegal table." |
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| 282 | << G4endl; |
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| 283 | } |
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| 284 | |
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| 285 | G4bool isApplicable = |
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| 286 | (*iter) -> BuildDEDXTable(atomicNumberIon, material); |
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| 287 | if(isApplicable) { |
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| 288 | |
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| 289 | #ifdef PRINT_TABLE_BUILT |
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| 290 | G4cout << " Atomic Number Ion = " << atomicNumberIon |
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| 291 | << ", Material = " << material -> GetName() |
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| 292 | << ", Table = " << (*iter) -> GetName() |
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| 293 | << G4endl; |
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| 294 | #endif |
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| 295 | break; |
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| 296 | } |
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| 297 | } |
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| 298 | } |
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| 299 | } |
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| 300 | |
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[968] | 301 | // The particle change object is cast to G4ParticleChangeForLoss |
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| 302 | if(! modelIsInitialised) { |
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| 303 | |
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| 304 | modelIsInitialised = true; |
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| 305 | corrections = G4LossTableManager::Instance() -> EmCorrections(); |
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| 306 | |
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| 307 | if(!particleChangeLoss) { |
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| 308 | if(pParticleChange) { |
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| 309 | |
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| 310 | particleChangeLoss = reinterpret_cast<G4ParticleChangeForLoss*> |
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| 311 | (pParticleChange); |
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| 312 | } |
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| 313 | else { |
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| 314 | particleChangeLoss = new G4ParticleChangeForLoss(); |
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| 315 | } |
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| 316 | } |
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| 317 | } |
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| 318 | |
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| 319 | // The G4BraggIonModel and G4BetheBlochModel instances are initialised with |
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| 320 | // the same settings as the current model: |
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| 321 | braggIonModel -> Initialise(particle, cuts); |
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| 322 | betheBlochModel -> Initialise(particle, cuts); |
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| 323 | } |
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| 324 | |
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[1055] | 325 | // ######################################################################### |
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[968] | 326 | |
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| 327 | G4double G4IonParametrisedLossModel::ComputeCrossSectionPerAtom( |
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| 328 | const G4ParticleDefinition* particle, |
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| 329 | G4double kineticEnergy, |
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| 330 | G4double atomicNumber, |
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| 331 | G4double, |
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| 332 | G4double cutEnergy, |
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| 333 | G4double maxKinEnergy) { |
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| 334 | |
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| 335 | // ############## Cross section per atom ################################ |
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| 336 | // Function computes ionization cross section per atom |
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| 337 | // |
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| 338 | // See Geant4 physics reference manual (version 9.1), section 9.1.3 |
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| 339 | // |
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| 340 | // Ref.: W.M. Yao et al, Jour. of Phys. G 33 (2006) 1. |
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| 341 | // B. Rossi, High energy particles, New York, NY: Prentice-Hall (1952). |
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| 342 | // |
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| 343 | // (Implementation adapted from G4BraggIonModel) |
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| 344 | |
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| 345 | G4double crosssection = 0.0; |
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| 346 | G4double tmax = MaxSecondaryEnergy(particle, kineticEnergy); |
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| 347 | G4double maxEnergy = std::min(tmax, maxKinEnergy); |
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| 348 | |
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| 349 | if(cutEnergy < tmax) { |
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| 350 | |
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| 351 | G4double energy = kineticEnergy + cacheMass; |
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| 352 | G4double betaSquared = kineticEnergy * |
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| 353 | (energy + cacheMass) / (energy * energy); |
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| 354 | |
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| 355 | crosssection = 1.0 / cutEnergy - 1.0 / maxEnergy - |
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| 356 | betaSquared * std::log(maxEnergy / cutEnergy) / tmax; |
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| 357 | |
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| 358 | crosssection *= twopi_mc2_rcl2 * cacheChargeSquare / betaSquared; |
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| 359 | } |
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| 360 | |
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| 361 | #ifdef PRINT_DEBUG_CS |
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| 362 | G4cout << "########################################################" |
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| 363 | << G4endl |
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| 364 | << "# G4IonParametrisedLossModel::ComputeCrossSectionPerAtom" |
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| 365 | << G4endl |
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| 366 | << "# particle =" << particle -> GetParticleName() |
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| 367 | << G4endl |
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| 368 | << "# cut(MeV) = " << cutEnergy/MeV |
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| 369 | << G4endl; |
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| 370 | |
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| 371 | G4cout << "#" |
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| 372 | << std::setw(13) << std::right << "E(MeV)" |
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| 373 | << std::setw(14) << "CS(um)" |
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| 374 | << std::setw(14) << "E_max_sec(MeV)" |
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| 375 | << G4endl |
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| 376 | << "# ------------------------------------------------------" |
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| 377 | << G4endl; |
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| 378 | |
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| 379 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
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| 380 | << std::setw(14) << crosssection / (um * um) |
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| 381 | << std::setw(14) << tmax / MeV |
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| 382 | << G4endl; |
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| 383 | #endif |
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| 384 | |
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| 385 | crosssection *= atomicNumber; |
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| 386 | |
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| 387 | return crosssection; |
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| 388 | } |
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| 389 | |
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[1055] | 390 | // ######################################################################### |
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[968] | 391 | |
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| 392 | G4double G4IonParametrisedLossModel::CrossSectionPerVolume( |
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| 393 | const G4Material* material, |
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| 394 | const G4ParticleDefinition* particle, |
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| 395 | G4double kineticEnergy, |
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| 396 | G4double cutEnergy, |
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| 397 | G4double maxEnergy) { |
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| 398 | |
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| 399 | G4double nbElecPerVolume = material -> GetTotNbOfElectPerVolume(); |
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| 400 | G4double cross = ComputeCrossSectionPerAtom(particle, |
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| 401 | kineticEnergy, |
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| 402 | nbElecPerVolume, 0, |
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| 403 | cutEnergy, |
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| 404 | maxEnergy); |
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| 405 | |
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| 406 | return cross; |
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| 407 | } |
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| 408 | |
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[1055] | 409 | // ######################################################################### |
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[968] | 410 | |
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| 411 | G4double G4IonParametrisedLossModel::ComputeDEDXPerVolume( |
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| 412 | const G4Material* material, |
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| 413 | const G4ParticleDefinition* particle, |
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| 414 | G4double kineticEnergy, |
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| 415 | G4double cutEnergy) { |
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| 416 | |
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| 417 | // ############## dE/dx ################################################## |
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| 418 | // Function computes dE/dx values, where following rules are adopted: |
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| 419 | // A. If the ion-material pair is covered by any native ion data |
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| 420 | // parameterisation, then: |
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| 421 | // * This parameterization is used for energies below a given energy |
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| 422 | // limit, |
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| 423 | // * whereas above the limit the Bethe-Bloch model is applied, in |
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| 424 | // combination with an effective charge estimate and high order |
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| 425 | // correction terms. |
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| 426 | // A smoothing procedure is applied to dE/dx values computed with |
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| 427 | // the second approach. The smoothing factor is based on the dE/dx |
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| 428 | // values of both approaches at the transition energy (high order |
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| 429 | // correction terms are included in the calculation of the transition |
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| 430 | // factor). |
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| 431 | // B. If the particle is a generic ion, the BraggIon and Bethe-Bloch |
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| 432 | // models are used and a smoothing procedure is applied to values |
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| 433 | // obtained with the second approach. |
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| 434 | // C. If the ion-material is not covered by any ion data parameterization |
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| 435 | // then: |
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| 436 | // * The BraggIon model is used for energies below a given energy |
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| 437 | // limit, |
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| 438 | // * whereas above the limit the Bethe-Bloch model is applied, in |
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| 439 | // combination with an effective charge estimate and high order |
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| 440 | // correction terms. |
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| 441 | // Also in this case, a smoothing procedure is applied to dE/dx values |
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| 442 | // computed with the second model. |
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| 443 | |
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| 444 | G4double dEdx = 0.0; |
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| 445 | UpdateDEDXCache(particle, material, cutEnergy); |
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| 446 | |
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| 447 | LossTableList::iterator iter = dedxCacheIter; |
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| 448 | |
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[1055] | 449 | if(iter != lossTableList.end()) { |
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[968] | 450 | |
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| 451 | G4double transitionEnergy = dedxCacheTransitionEnergy; |
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| 452 | |
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| 453 | if(transitionEnergy > kineticEnergy) { |
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| 454 | |
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| 455 | dEdx = (*iter) -> GetDEDX(particle, material, kineticEnergy); |
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| 456 | |
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| 457 | G4double dEdxDeltaRays = DeltaRayMeanEnergyTransferRate(material, |
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| 458 | particle, |
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| 459 | kineticEnergy, |
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| 460 | cutEnergy); |
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| 461 | dEdx -= dEdxDeltaRays; |
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| 462 | } |
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| 463 | else { |
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| 464 | G4double massRatio = dedxCacheGenIonMassRatio; |
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| 465 | |
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| 466 | G4double chargeSquare = |
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| 467 | GetChargeSquareRatio(particle, material, kineticEnergy); |
---|
| 468 | |
---|
| 469 | G4double scaledKineticEnergy = kineticEnergy * massRatio; |
---|
| 470 | G4double scaledTransitionEnergy = transitionEnergy * massRatio; |
---|
| 471 | |
---|
| 472 | G4double lowEnergyLimit = betheBlochModel -> LowEnergyLimit(); |
---|
| 473 | |
---|
| 474 | if(scaledTransitionEnergy >= lowEnergyLimit) { |
---|
| 475 | |
---|
| 476 | dEdx = betheBlochModel -> ComputeDEDXPerVolume( |
---|
| 477 | material, genericIon, |
---|
| 478 | scaledKineticEnergy, cutEnergy); |
---|
[1055] | 479 | |
---|
| 480 | dEdx *= chargeSquare; |
---|
[968] | 481 | |
---|
[1055] | 482 | dEdx += corrections -> ComputeIonCorrections(particle, |
---|
| 483 | material, kineticEnergy); |
---|
[968] | 484 | |
---|
[1055] | 485 | G4double factor = 1.0 + dedxCacheTransitionFactor / |
---|
| 486 | kineticEnergy; |
---|
| 487 | |
---|
| 488 | dEdx *= factor; |
---|
| 489 | } |
---|
[968] | 490 | } |
---|
| 491 | } |
---|
| 492 | else { |
---|
| 493 | G4double massRatio = 1.0; |
---|
| 494 | G4double chargeSquare = 1.0; |
---|
| 495 | |
---|
| 496 | if(particle != genericIon) { |
---|
| 497 | |
---|
| 498 | chargeSquare = GetChargeSquareRatio(particle, material, kineticEnergy); |
---|
| 499 | massRatio = genericIonPDGMass / particle -> GetPDGMass(); |
---|
| 500 | } |
---|
| 501 | |
---|
| 502 | G4double scaledKineticEnergy = kineticEnergy * massRatio; |
---|
| 503 | |
---|
| 504 | G4double lowEnergyLimit = betheBlochModel -> LowEnergyLimit(); |
---|
| 505 | if(scaledKineticEnergy < lowEnergyLimit) { |
---|
| 506 | dEdx = braggIonModel -> ComputeDEDXPerVolume( |
---|
| 507 | material, genericIon, |
---|
| 508 | scaledKineticEnergy, cutEnergy); |
---|
| 509 | |
---|
| 510 | dEdx *= chargeSquare; |
---|
| 511 | } |
---|
| 512 | else { |
---|
| 513 | G4double dEdxLimitParam = braggIonModel -> ComputeDEDXPerVolume( |
---|
| 514 | material, genericIon, |
---|
| 515 | lowEnergyLimit, cutEnergy); |
---|
| 516 | |
---|
| 517 | G4double dEdxLimitBetheBloch = betheBlochModel -> ComputeDEDXPerVolume( |
---|
| 518 | material, genericIon, |
---|
| 519 | lowEnergyLimit, cutEnergy); |
---|
| 520 | |
---|
| 521 | if(particle != genericIon) { |
---|
| 522 | G4double chargeSquareLowEnergyLimit = |
---|
| 523 | GetChargeSquareRatio(particle, material, |
---|
| 524 | lowEnergyLimit / massRatio); |
---|
| 525 | |
---|
| 526 | dEdxLimitParam *= chargeSquareLowEnergyLimit; |
---|
| 527 | dEdxLimitBetheBloch *= chargeSquareLowEnergyLimit; |
---|
| 528 | |
---|
| 529 | dEdxLimitBetheBloch += |
---|
| 530 | corrections -> ComputeIonCorrections(particle, |
---|
| 531 | material, lowEnergyLimit / massRatio); |
---|
| 532 | } |
---|
| 533 | |
---|
| 534 | G4double factor = (1.0 + (dEdxLimitParam/dEdxLimitBetheBloch - 1.0) |
---|
| 535 | * lowEnergyLimit / scaledKineticEnergy); |
---|
| 536 | |
---|
| 537 | dEdx = betheBlochModel -> ComputeDEDXPerVolume( |
---|
| 538 | material, genericIon, |
---|
| 539 | scaledKineticEnergy, cutEnergy); |
---|
| 540 | dEdx *= factor; |
---|
| 541 | |
---|
| 542 | dEdx *= chargeSquare; |
---|
| 543 | |
---|
| 544 | if(particle != genericIon) { |
---|
| 545 | dEdx += corrections -> ComputeIonCorrections(particle, |
---|
| 546 | material, kineticEnergy); |
---|
| 547 | } |
---|
| 548 | } |
---|
| 549 | |
---|
| 550 | } |
---|
| 551 | |
---|
| 552 | if (dEdx < 0.0) dEdx = 0.0; |
---|
| 553 | |
---|
| 554 | return dEdx; |
---|
| 555 | } |
---|
| 556 | |
---|
[1055] | 557 | // ######################################################################### |
---|
[968] | 558 | |
---|
| 559 | void G4IonParametrisedLossModel::PrintDEDXTable( |
---|
| 560 | const G4ParticleDefinition* particle, // Projectile (ion) |
---|
| 561 | const G4Material* material, // Absorber material |
---|
| 562 | G4double lowerBoundary, // Minimum energy per nucleon |
---|
| 563 | G4double upperBoundary, // Maximum energy per nucleon |
---|
| 564 | G4int nmbBins, // Number of bins |
---|
| 565 | G4bool logScaleEnergy) { // Logarithmic scaling of energy |
---|
| 566 | |
---|
| 567 | G4double atomicMassNumber = particle -> GetAtomicMass(); |
---|
| 568 | G4double materialDensity = material -> GetDensity(); |
---|
| 569 | |
---|
| 570 | G4cout << "# dE/dx table for " << particle -> GetParticleName() |
---|
| 571 | << " in material " << material -> GetName() |
---|
| 572 | << " of density " << materialDensity / g * cm3 |
---|
| 573 | << " g/cm3" |
---|
| 574 | << G4endl |
---|
| 575 | << "# Projectile mass number A1 = " << atomicMassNumber |
---|
| 576 | << G4endl |
---|
| 577 | << "# ------------------------------------------------------" |
---|
| 578 | << G4endl; |
---|
| 579 | G4cout << "#" |
---|
| 580 | << std::setw(13) << std::right << "E" |
---|
| 581 | << std::setw(14) << "E/A1" |
---|
| 582 | << std::setw(14) << "dE/dx" |
---|
| 583 | << std::setw(14) << "1/rho*dE/dx" |
---|
| 584 | << G4endl; |
---|
| 585 | G4cout << "#" |
---|
| 586 | << std::setw(13) << std::right << "(MeV)" |
---|
| 587 | << std::setw(14) << "(MeV)" |
---|
[1055] | 588 | << std::setw(14) << "(MeV/cm)" |
---|
[968] | 589 | << std::setw(14) << "(MeV*cm2/mg)" |
---|
| 590 | << G4endl |
---|
| 591 | << "# ------------------------------------------------------" |
---|
| 592 | << G4endl; |
---|
| 593 | |
---|
| 594 | G4double energyLowerBoundary = lowerBoundary * atomicMassNumber; |
---|
| 595 | G4double energyUpperBoundary = upperBoundary * atomicMassNumber; |
---|
| 596 | |
---|
| 597 | if(logScaleEnergy) { |
---|
| 598 | |
---|
| 599 | energyLowerBoundary = std::log(energyLowerBoundary); |
---|
| 600 | energyUpperBoundary = std::log(energyUpperBoundary); |
---|
| 601 | } |
---|
| 602 | |
---|
| 603 | G4double deltaEnergy = (energyUpperBoundary - energyLowerBoundary) / |
---|
| 604 | G4double(nmbBins); |
---|
| 605 | |
---|
| 606 | for(int i = 0; i < nmbBins + 1; i++) { |
---|
| 607 | |
---|
| 608 | G4double energy = energyLowerBoundary + i * deltaEnergy; |
---|
| 609 | if(logScaleEnergy) energy = std::exp(energy); |
---|
| 610 | |
---|
| 611 | G4double dedx = ComputeDEDXPerVolume(material, particle, energy, DBL_MAX); |
---|
| 612 | G4cout.precision(6); |
---|
| 613 | G4cout << std::setw(14) << std::right << energy / MeV |
---|
| 614 | << std::setw(14) << energy / atomicMassNumber / MeV |
---|
[1055] | 615 | << std::setw(14) << dedx / MeV * cm |
---|
[968] | 616 | << std::setw(14) << dedx / materialDensity / (MeV*cm2/(0.001*g)) |
---|
| 617 | << G4endl; |
---|
| 618 | } |
---|
| 619 | } |
---|
| 620 | |
---|
[1055] | 621 | // ######################################################################### |
---|
[968] | 622 | |
---|
[1055] | 623 | void G4IonParametrisedLossModel::PrintDEDXTableHandlers( |
---|
| 624 | const G4ParticleDefinition* particle, // Projectile (ion) |
---|
| 625 | const G4Material* material, // Absorber material |
---|
| 626 | G4double lowerBoundary, // Minimum energy per nucleon |
---|
| 627 | G4double upperBoundary, // Maximum energy per nucleon |
---|
| 628 | G4int nmbBins, // Number of bins |
---|
| 629 | G4bool logScaleEnergy) { // Logarithmic scaling of energy |
---|
| 630 | |
---|
| 631 | LossTableList::iterator iter = lossTableList.begin(); |
---|
| 632 | LossTableList::iterator iter_end = lossTableList.end(); |
---|
| 633 | |
---|
| 634 | for(;iter != iter_end; iter++) { |
---|
| 635 | G4bool isApplicable = (*iter) -> IsApplicable(particle, material); |
---|
| 636 | if(isApplicable) { |
---|
| 637 | (*iter) -> PrintDEDXTable(particle, material, |
---|
| 638 | lowerBoundary, upperBoundary, |
---|
| 639 | nmbBins,logScaleEnergy); |
---|
| 640 | break; |
---|
| 641 | } |
---|
| 642 | } |
---|
| 643 | } |
---|
| 644 | |
---|
| 645 | // ######################################################################### |
---|
| 646 | |
---|
[968] | 647 | void G4IonParametrisedLossModel::SampleSecondaries( |
---|
| 648 | std::vector<G4DynamicParticle*>* secondaries, |
---|
| 649 | const G4MaterialCutsCouple*, |
---|
| 650 | const G4DynamicParticle* particle, |
---|
| 651 | G4double cutKinEnergySec, |
---|
| 652 | G4double userMaxKinEnergySec) { |
---|
| 653 | |
---|
| 654 | |
---|
| 655 | // ############## Sampling of secondaries ################################# |
---|
| 656 | // The probability density function (pdf) of the kinetic energy T of a |
---|
| 657 | // secondary electron may be written as: |
---|
| 658 | // pdf(T) = f(T) * g(T) |
---|
| 659 | // where |
---|
| 660 | // f(T) = (Tmax - Tcut) / (Tmax * Tcut) * (1 / T^2) |
---|
| 661 | // g(T) = 1 - beta^2 * T / Tmax |
---|
| 662 | // where Tmax is the maximum kinetic energy of the secondary, Tcut |
---|
| 663 | // is the lower energy cut and beta is the kinetic energy of the |
---|
| 664 | // projectile. |
---|
| 665 | // |
---|
| 666 | // Sampling of the kinetic energy of a secondary electron: |
---|
| 667 | // 1) T0 is sampled from f(T) using the cumulated distribution function |
---|
| 668 | // F(T) = int_Tcut^T f(T')dT' |
---|
| 669 | // 2) T is accepted or rejected by evaluating the rejection function g(T) |
---|
| 670 | // at the sampled energy T0 against a randomly sampled value |
---|
| 671 | // |
---|
| 672 | // |
---|
| 673 | // See Geant4 physics reference manual (version 9.1), section 9.1.4 |
---|
| 674 | // |
---|
| 675 | // |
---|
| 676 | // Reference pdf: W.M. Yao et al, Jour. of Phys. G 33 (2006) 1. |
---|
| 677 | // |
---|
| 678 | // (Implementation adapted from G4BraggIonModel) |
---|
| 679 | |
---|
| 680 | G4double rossiMaxKinEnergySec = MaxSecondaryKinEnergy(particle); |
---|
| 681 | G4double maxKinEnergySec = |
---|
| 682 | std::min(rossiMaxKinEnergySec, userMaxKinEnergySec); |
---|
| 683 | |
---|
| 684 | if(cutKinEnergySec >= maxKinEnergySec) return; |
---|
| 685 | |
---|
| 686 | G4double kineticEnergy = particle -> GetKineticEnergy(); |
---|
| 687 | G4ThreeVector direction = particle ->GetMomentumDirection(); |
---|
| 688 | |
---|
| 689 | G4double energy = kineticEnergy + cacheMass; |
---|
| 690 | G4double betaSquared = kineticEnergy * |
---|
| 691 | (energy + cacheMass) / (energy * energy); |
---|
| 692 | |
---|
| 693 | G4double kinEnergySec; |
---|
| 694 | G4double g; |
---|
| 695 | |
---|
| 696 | do { |
---|
| 697 | |
---|
| 698 | // Sampling kinetic energy from f(T) (using F(T)): |
---|
| 699 | G4double xi = G4UniformRand(); |
---|
| 700 | kinEnergySec = cutKinEnergySec * maxKinEnergySec / |
---|
| 701 | (maxKinEnergySec * (1.0 - xi) + cutKinEnergySec * xi); |
---|
| 702 | |
---|
| 703 | // Deriving the value of the rejection function at the obtained kinetic |
---|
| 704 | // energy: |
---|
| 705 | g = 1.0 - betaSquared * kinEnergySec / rossiMaxKinEnergySec; |
---|
| 706 | |
---|
| 707 | if(g > 1.0) { |
---|
| 708 | G4cout << "G4IonParametrisedLossModel::SampleSecondary Warning: " |
---|
| 709 | << "Majorant 1.0 < " |
---|
| 710 | << g << " for e= " << kinEnergySec |
---|
| 711 | << G4endl; |
---|
| 712 | } |
---|
| 713 | |
---|
| 714 | } while( G4UniformRand() >= g ); |
---|
| 715 | |
---|
| 716 | G4double momentumSec = |
---|
| 717 | std::sqrt(kinEnergySec * (kinEnergySec + 2.0 * electron_mass_c2)); |
---|
| 718 | |
---|
| 719 | G4double totMomentum = energy*std::sqrt(betaSquared); |
---|
| 720 | G4double cost = kinEnergySec * (energy + electron_mass_c2) / |
---|
| 721 | (momentumSec * totMomentum); |
---|
| 722 | if(cost > 1.0) cost = 1.0; |
---|
| 723 | G4double sint = std::sqrt((1.0 - cost)*(1.0 + cost)); |
---|
| 724 | |
---|
| 725 | G4double phi = twopi * G4UniformRand() ; |
---|
| 726 | |
---|
| 727 | G4ThreeVector directionSec(sint*std::cos(phi),sint*std::sin(phi), cost) ; |
---|
| 728 | directionSec.rotateUz(direction); |
---|
| 729 | |
---|
| 730 | // create G4DynamicParticle object for delta ray |
---|
| 731 | G4DynamicParticle* delta = new G4DynamicParticle(G4Electron::Definition(), |
---|
| 732 | directionSec, |
---|
| 733 | kinEnergySec); |
---|
| 734 | |
---|
| 735 | secondaries -> push_back(delta); |
---|
| 736 | |
---|
| 737 | // Change kinematics of primary particle |
---|
| 738 | kineticEnergy -= kinEnergySec; |
---|
| 739 | G4ThreeVector finalP = direction*totMomentum - directionSec*momentumSec; |
---|
| 740 | finalP = finalP.unit(); |
---|
| 741 | |
---|
| 742 | particleChangeLoss -> SetProposedKineticEnergy(kineticEnergy); |
---|
| 743 | particleChangeLoss -> SetProposedMomentumDirection(finalP); |
---|
| 744 | } |
---|
| 745 | |
---|
[1055] | 746 | // ######################################################################### |
---|
[968] | 747 | |
---|
| 748 | void G4IonParametrisedLossModel::UpdateDEDXCache( |
---|
| 749 | const G4ParticleDefinition* particle, |
---|
| 750 | const G4Material* material, |
---|
| 751 | G4double cutEnergy) { |
---|
| 752 | |
---|
| 753 | // ############## Caching ################################################## |
---|
| 754 | // If the ion-material combination is covered by any native ion data |
---|
| 755 | // parameterisation (for low energies), a transition factor is computed |
---|
| 756 | // which is applied to Bethe-Bloch results at higher energies to |
---|
| 757 | // guarantee a smooth transition. |
---|
| 758 | // This factor only needs to be calculated for the first step an ion |
---|
| 759 | // performs inside a certain material. |
---|
| 760 | |
---|
| 761 | if(particle == dedxCacheParticle && |
---|
| 762 | material == dedxCacheMaterial && |
---|
| 763 | cutEnergy == dedxCacheEnergyCut) { |
---|
| 764 | } |
---|
| 765 | else { |
---|
| 766 | |
---|
| 767 | dedxCacheParticle = particle; |
---|
| 768 | dedxCacheMaterial = material; |
---|
| 769 | dedxCacheEnergyCut = cutEnergy; |
---|
| 770 | |
---|
| 771 | G4double massRatio = genericIonPDGMass / particle -> GetPDGMass(); |
---|
| 772 | dedxCacheGenIonMassRatio = massRatio; |
---|
| 773 | |
---|
| 774 | LossTableList::iterator iter = IsApplicable(particle, material); |
---|
| 775 | dedxCacheIter = iter; |
---|
| 776 | |
---|
| 777 | // If any table is applicable, the transition factor is computed: |
---|
[1055] | 778 | if(iter != lossTableList.end()) { |
---|
[968] | 779 | |
---|
| 780 | // Retrieving the transition energy from the parameterisation table |
---|
| 781 | G4double transitionEnergy = |
---|
| 782 | (*iter) -> GetUpperEnergyEdge(particle, material); |
---|
| 783 | dedxCacheTransitionEnergy = transitionEnergy; |
---|
| 784 | |
---|
| 785 | // Computing dE/dx from low-energy parameterisation at |
---|
| 786 | // transition energy |
---|
| 787 | G4double dEdxParam = (*iter) -> GetDEDX(particle, material, |
---|
| 788 | transitionEnergy); |
---|
| 789 | |
---|
| 790 | G4double dEdxDeltaRays = DeltaRayMeanEnergyTransferRate(material, |
---|
| 791 | particle, |
---|
| 792 | transitionEnergy, |
---|
| 793 | cutEnergy); |
---|
| 794 | dEdxParam -= dEdxDeltaRays; |
---|
| 795 | |
---|
| 796 | // Computing dE/dx from Bethe-Bloch formula at transition |
---|
| 797 | // energy |
---|
| 798 | G4double transitionChargeSquare = |
---|
| 799 | GetChargeSquareRatio(particle, material, transitionEnergy); |
---|
| 800 | |
---|
| 801 | G4double scaledTransitionEnergy = transitionEnergy * massRatio; |
---|
| 802 | |
---|
| 803 | G4double dEdxBetheBloch = |
---|
| 804 | betheBlochModel -> ComputeDEDXPerVolume( |
---|
| 805 | material, genericIon, |
---|
| 806 | scaledTransitionEnergy, cutEnergy); |
---|
| 807 | dEdxBetheBloch *= transitionChargeSquare; |
---|
| 808 | |
---|
| 809 | // Additionally, high order corrections are added |
---|
| 810 | dEdxBetheBloch += |
---|
| 811 | corrections -> ComputeIonCorrections(particle, |
---|
| 812 | material, transitionEnergy); |
---|
| 813 | |
---|
| 814 | // Computing transition factor from both dE/dx values |
---|
| 815 | dedxCacheTransitionFactor = |
---|
| 816 | (dEdxParam - dEdxBetheBloch)/dEdxBetheBloch |
---|
| 817 | * transitionEnergy; |
---|
| 818 | |
---|
| 819 | // Build range-energy and energy-range vectors if they don't exist |
---|
| 820 | IonMatCouple ionMatCouple = std::make_pair(particle, material); |
---|
| 821 | RangeEnergyTable::iterator iterRange = r.find(ionMatCouple); |
---|
| 822 | |
---|
| 823 | if(iterRange == r.end()) BuildRangeVector(particle, material, |
---|
| 824 | cutEnergy); |
---|
| 825 | |
---|
| 826 | dedxCacheEnergyRange = E[ionMatCouple]; |
---|
| 827 | dedxCacheRangeEnergy = r[ionMatCouple]; |
---|
| 828 | } |
---|
| 829 | else { |
---|
| 830 | |
---|
| 831 | dedxCacheParticle = particle; |
---|
| 832 | dedxCacheMaterial = material; |
---|
| 833 | dedxCacheEnergyCut = cutEnergy; |
---|
| 834 | |
---|
| 835 | dedxCacheGenIonMassRatio = |
---|
| 836 | genericIonPDGMass / particle -> GetPDGMass(); |
---|
| 837 | |
---|
| 838 | dedxCacheTransitionEnergy = 0.0; |
---|
| 839 | dedxCacheTransitionFactor = 0.0; |
---|
| 840 | dedxCacheEnergyRange = 0; |
---|
| 841 | dedxCacheRangeEnergy = 0; |
---|
| 842 | } |
---|
| 843 | } |
---|
| 844 | } |
---|
| 845 | |
---|
[1055] | 846 | // ######################################################################### |
---|
[968] | 847 | |
---|
| 848 | void G4IonParametrisedLossModel::CorrectionsAlongStep( |
---|
| 849 | const G4MaterialCutsCouple* couple, |
---|
| 850 | const G4DynamicParticle* dynamicParticle, |
---|
| 851 | G4double& eloss, |
---|
| 852 | G4double&, |
---|
| 853 | G4double length) { |
---|
| 854 | |
---|
| 855 | // ############## Corrections for along step energy loss calculation ###### |
---|
| 856 | // The computed energy loss (due to electronic stopping) is overwritten |
---|
| 857 | // by this function if an ion data parameterization is available for the |
---|
| 858 | // current ion-material pair. |
---|
| 859 | // No action on the energy loss (due to electronic stopping) is performed |
---|
| 860 | // if no parameterization is available. In this case the original |
---|
| 861 | // generic ion tables (in combination with the effective charge) are used |
---|
| 862 | // in the along step DoIt function. |
---|
| 863 | // |
---|
| 864 | // Contributon due to nuclear stopping are applied in any case (given the |
---|
| 865 | // nuclear stopping flag is set). |
---|
| 866 | // |
---|
| 867 | // (Implementation partly adapted from G4BraggIonModel/G4BetheBlochModel) |
---|
| 868 | |
---|
| 869 | const G4ParticleDefinition* particle = dynamicParticle -> GetDefinition(); |
---|
| 870 | const G4Material* material = couple -> GetMaterial(); |
---|
| 871 | |
---|
| 872 | G4double kineticEnergy = dynamicParticle -> GetKineticEnergy(); |
---|
| 873 | |
---|
[1055] | 874 | if(kineticEnergy == eloss) { return; } |
---|
| 875 | |
---|
[968] | 876 | G4double cutEnergy = DBL_MAX; |
---|
| 877 | size_t cutIndex = couple -> GetIndex(); |
---|
| 878 | cutEnergy = cutEnergies[cutIndex]; |
---|
| 879 | |
---|
| 880 | UpdateDEDXCache(particle, material, cutEnergy); |
---|
| 881 | |
---|
| 882 | LossTableList::iterator iter = dedxCacheIter; |
---|
| 883 | |
---|
| 884 | // If parameterization for ions is available the electronic energy loss |
---|
| 885 | // is overwritten |
---|
[1055] | 886 | if(iter != lossTableList.end()) { |
---|
[968] | 887 | |
---|
| 888 | // The energy loss is calculated using the ComputeDEDXPerVolume function |
---|
| 889 | // and the step length (it is assumed that dE/dx does not change |
---|
| 890 | // considerably along the step) |
---|
| 891 | eloss = |
---|
| 892 | length * ComputeDEDXPerVolume(material, particle, |
---|
| 893 | kineticEnergy, cutEnergy); |
---|
| 894 | |
---|
| 895 | #ifdef PRINT_DEBUG |
---|
| 896 | G4cout.precision(6); |
---|
| 897 | G4cout << "########################################################" |
---|
| 898 | << G4endl |
---|
| 899 | << "# G4IonParametrisedLossModel::CorrectionsAlongStep" |
---|
| 900 | << G4endl |
---|
| 901 | << "# cut(MeV) = " << cutEnergy/MeV |
---|
| 902 | << G4endl; |
---|
| 903 | |
---|
| 904 | G4cout << "#" |
---|
| 905 | << std::setw(13) << std::right << "E(MeV)" |
---|
| 906 | << std::setw(14) << "l(um)" |
---|
| 907 | << std::setw(14) << "l*dE/dx(MeV)" |
---|
| 908 | << std::setw(14) << "(l*dE/dx)/E" |
---|
| 909 | << G4endl |
---|
| 910 | << "# ------------------------------------------------------" |
---|
| 911 | << G4endl; |
---|
| 912 | |
---|
| 913 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
---|
| 914 | << std::setw(14) << length / um |
---|
| 915 | << std::setw(14) << eloss / MeV |
---|
| 916 | << std::setw(14) << eloss / kineticEnergy * 100.0 |
---|
| 917 | << G4endl; |
---|
| 918 | #endif |
---|
| 919 | |
---|
| 920 | // If the energy loss exceeds a certain fraction of the kinetic energy |
---|
| 921 | // (the fraction is indicated by the parameter "energyLossLimit") then |
---|
| 922 | // the range tables are used to derive a more accurate value of the |
---|
| 923 | // energy loss |
---|
| 924 | if(eloss > energyLossLimit * kineticEnergy) { |
---|
| 925 | |
---|
| 926 | eloss = ComputeLossForStep(material, particle, |
---|
| 927 | kineticEnergy, cutEnergy,length); |
---|
| 928 | |
---|
| 929 | #ifdef PRINT_DEBUG |
---|
| 930 | G4cout << "# Correction applied:" |
---|
| 931 | << G4endl; |
---|
| 932 | |
---|
| 933 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
---|
| 934 | << std::setw(14) << length / um |
---|
| 935 | << std::setw(14) << eloss / MeV |
---|
| 936 | << std::setw(14) << eloss / kineticEnergy * 100.0 |
---|
| 937 | << G4endl; |
---|
| 938 | #endif |
---|
| 939 | |
---|
| 940 | } |
---|
| 941 | } |
---|
| 942 | |
---|
| 943 | // For all corrections below a kinetic energy between the Pre- and |
---|
| 944 | // Post-step energy values is used |
---|
| 945 | G4double energy = kineticEnergy - eloss * 0.5; |
---|
| 946 | if(energy < 0.0) energy = kineticEnergy * 0.5; |
---|
| 947 | |
---|
| 948 | G4double chargeSquareRatio = corrections -> |
---|
| 949 | EffectiveChargeSquareRatio(particle, |
---|
| 950 | material, |
---|
| 951 | energy); |
---|
| 952 | GetModelOfFluctuations() -> SetParticleAndCharge(particle, |
---|
| 953 | chargeSquareRatio); |
---|
| 954 | |
---|
| 955 | // A correction is applied considering the change of the effective charge |
---|
| 956 | // along the step (the parameter "corrFactor" refers to the effective |
---|
| 957 | // charge at the beginning of the step). Note: the correction is not |
---|
| 958 | // applied for energy loss values deriving directly from parameterized |
---|
| 959 | // ion stopping power tables |
---|
| 960 | G4double transitionEnergy = dedxCacheTransitionEnergy; |
---|
| 961 | |
---|
[1055] | 962 | if(iter != lossTableList.end() && transitionEnergy < kineticEnergy) { |
---|
[968] | 963 | chargeSquareRatio *= corrections -> EffectiveChargeCorrection(particle, |
---|
| 964 | material, |
---|
| 965 | energy); |
---|
| 966 | |
---|
| 967 | G4double chargeSquareRatioCorr = chargeSquareRatio/corrFactor; |
---|
| 968 | eloss *= chargeSquareRatioCorr; |
---|
| 969 | } |
---|
[1055] | 970 | else if (iter == lossTableList.end()) { |
---|
[968] | 971 | |
---|
| 972 | chargeSquareRatio *= corrections -> EffectiveChargeCorrection(particle, |
---|
| 973 | material, |
---|
| 974 | energy); |
---|
| 975 | |
---|
| 976 | G4double chargeSquareRatioCorr = chargeSquareRatio/corrFactor; |
---|
| 977 | eloss *= chargeSquareRatioCorr; |
---|
| 978 | } |
---|
| 979 | |
---|
| 980 | // Ion high order corrections are applied if the current model does not |
---|
| 981 | // overwrite the energy loss (i.e. when the effective charge approach is |
---|
| 982 | // used) |
---|
[1055] | 983 | if(iter == lossTableList.end()) { |
---|
[968] | 984 | |
---|
| 985 | G4double scaledKineticEnergy = kineticEnergy * dedxCacheGenIonMassRatio; |
---|
| 986 | G4double lowEnergyLimit = betheBlochModel -> LowEnergyLimit(); |
---|
| 987 | |
---|
| 988 | // Corrections are only applied in the Bethe-Bloch energy region |
---|
| 989 | if(scaledKineticEnergy > lowEnergyLimit) |
---|
| 990 | eloss += length * |
---|
| 991 | corrections -> IonHighOrderCorrections(particle, couple, energy); |
---|
| 992 | } |
---|
| 993 | |
---|
| 994 | // Nuclear stopping |
---|
| 995 | G4double scaledKineticEnergy = kineticEnergy * dedxCacheGenIonMassRatio; |
---|
| 996 | G4double charge = particle->GetPDGCharge()/eplus; |
---|
| 997 | G4double chargeSquare = charge * charge; |
---|
| 998 | |
---|
| 999 | if(nuclearStopping && scaledKineticEnergy < chargeSquare * 100.0 * MeV) { |
---|
| 1000 | |
---|
| 1001 | G4double nloss = |
---|
| 1002 | length * corrections -> NuclearDEDX(particle, material, energy, false); |
---|
| 1003 | |
---|
| 1004 | if(eloss + nloss > kineticEnergy) { |
---|
| 1005 | |
---|
| 1006 | nloss *= (kineticEnergy / (eloss + nloss)); |
---|
| 1007 | eloss = kineticEnergy; |
---|
| 1008 | } else { |
---|
| 1009 | eloss += nloss; |
---|
| 1010 | } |
---|
| 1011 | |
---|
| 1012 | particleChangeLoss -> ProposeNonIonizingEnergyDeposit(nloss); |
---|
| 1013 | } |
---|
| 1014 | } |
---|
| 1015 | |
---|
[1055] | 1016 | // ######################################################################### |
---|
[968] | 1017 | |
---|
| 1018 | void G4IonParametrisedLossModel::BuildRangeVector( |
---|
| 1019 | const G4ParticleDefinition* particle, |
---|
| 1020 | const G4Material* material, |
---|
| 1021 | G4double cutEnergy) { |
---|
| 1022 | |
---|
| 1023 | G4double massRatio = genericIonPDGMass / particle -> GetPDGMass(); |
---|
| 1024 | |
---|
| 1025 | G4double lowerEnergy = lowerEnergyEdgeIntegr / massRatio; |
---|
| 1026 | G4double upperEnergy = upperEnergyEdgeIntegr / massRatio; |
---|
| 1027 | |
---|
| 1028 | G4double logLowerEnergyEdge = std::log(lowerEnergy); |
---|
| 1029 | G4double logUpperEnergyEdge = std::log(upperEnergy); |
---|
| 1030 | |
---|
| 1031 | G4double logDeltaEnergy = (logUpperEnergyEdge - logLowerEnergyEdge) / |
---|
| 1032 | G4double(nmbBins); |
---|
| 1033 | |
---|
| 1034 | G4double logDeltaIntegr = logDeltaEnergy / G4double(nmbSubBins); |
---|
| 1035 | |
---|
| 1036 | G4LPhysicsFreeVector* energyRangeVector = |
---|
| 1037 | new G4LPhysicsFreeVector(nmbBins+1, |
---|
| 1038 | lowerEnergy, |
---|
| 1039 | upperEnergy); |
---|
| 1040 | energyRangeVector -> SetSpline(true); |
---|
| 1041 | |
---|
| 1042 | G4double dedxLow = ComputeDEDXPerVolume(material, |
---|
| 1043 | particle, |
---|
| 1044 | lowerEnergy, |
---|
| 1045 | cutEnergy); |
---|
| 1046 | |
---|
| 1047 | G4double range = 2.0 * lowerEnergy / dedxLow; |
---|
| 1048 | |
---|
| 1049 | energyRangeVector -> PutValues(0, lowerEnergy, range); |
---|
| 1050 | |
---|
| 1051 | G4double logEnergy = std::log(lowerEnergy); |
---|
| 1052 | for(size_t i = 1; i < nmbBins+1; i++) { |
---|
| 1053 | |
---|
| 1054 | G4double logEnergyIntegr = logEnergy; |
---|
| 1055 | |
---|
| 1056 | for(size_t j = 0; j < nmbSubBins; j++) { |
---|
| 1057 | |
---|
| 1058 | G4double binLowerBoundary = std::exp(logEnergyIntegr); |
---|
| 1059 | logEnergyIntegr += logDeltaIntegr; |
---|
| 1060 | |
---|
| 1061 | G4double binUpperBoundary = std::exp(logEnergyIntegr); |
---|
| 1062 | G4double deltaIntegr = binUpperBoundary - binLowerBoundary; |
---|
| 1063 | |
---|
| 1064 | G4double energyIntegr = binLowerBoundary + 0.5 * deltaIntegr; |
---|
| 1065 | |
---|
| 1066 | G4double dedxValue = ComputeDEDXPerVolume(material, |
---|
| 1067 | particle, |
---|
| 1068 | energyIntegr, |
---|
| 1069 | cutEnergy); |
---|
| 1070 | |
---|
| 1071 | if(dedxValue > 0.0) range += deltaIntegr / dedxValue; |
---|
| 1072 | |
---|
| 1073 | #ifdef PRINT_DEBUG_DETAILS |
---|
| 1074 | G4cout << " E = "<< energyIntegr/MeV |
---|
| 1075 | << " MeV -> dE = " << deltaIntegr/MeV |
---|
| 1076 | << " MeV -> dE/dx = " << dedxValue/MeV*mm |
---|
| 1077 | << " MeV/mm -> dE/(dE/dx) = " << deltaIntegr / |
---|
| 1078 | dedxValue / mm |
---|
| 1079 | << " mm -> range = " << range / mm |
---|
| 1080 | << " mm " << G4endl; |
---|
| 1081 | #endif |
---|
| 1082 | } |
---|
| 1083 | |
---|
| 1084 | logEnergy += logDeltaEnergy; |
---|
| 1085 | |
---|
| 1086 | G4double energy = std::exp(logEnergy); |
---|
| 1087 | |
---|
| 1088 | energyRangeVector -> PutValues(i, energy, range); |
---|
| 1089 | |
---|
| 1090 | #ifdef PRINT_DEBUG_DETAILS |
---|
| 1091 | G4cout << "G4IonParametrisedLossModel::BuildRangeVector() bin = " |
---|
| 1092 | << i <<", E = " |
---|
| 1093 | << energy / MeV << " MeV, R = " |
---|
| 1094 | << range / mm << " mm" |
---|
| 1095 | << G4endl; |
---|
| 1096 | #endif |
---|
| 1097 | |
---|
| 1098 | } |
---|
| 1099 | |
---|
| 1100 | G4bool b; |
---|
| 1101 | |
---|
| 1102 | G4double lowerRangeEdge = |
---|
| 1103 | energyRangeVector -> GetValue(lowerEnergy, b); |
---|
| 1104 | G4double upperRangeEdge = |
---|
| 1105 | energyRangeVector -> GetValue(upperEnergy, b); |
---|
| 1106 | |
---|
| 1107 | G4LPhysicsFreeVector* rangeEnergyVector |
---|
| 1108 | = new G4LPhysicsFreeVector(nmbBins+1, |
---|
| 1109 | lowerRangeEdge, |
---|
| 1110 | upperRangeEdge); |
---|
| 1111 | rangeEnergyVector -> SetSpline(true); |
---|
| 1112 | |
---|
| 1113 | for(size_t i = 0; i < nmbBins+1; i++) { |
---|
| 1114 | G4double energy = energyRangeVector -> GetLowEdgeEnergy(i); |
---|
| 1115 | rangeEnergyVector -> |
---|
| 1116 | PutValues(i, energyRangeVector -> GetValue(energy, b), energy); |
---|
| 1117 | } |
---|
| 1118 | |
---|
| 1119 | #ifdef PRINT_DEBUG_TABLES |
---|
| 1120 | G4cout << *energyLossVector |
---|
| 1121 | << *energyRangeVector |
---|
| 1122 | << *rangeEnergyVector << G4endl; |
---|
| 1123 | #endif |
---|
| 1124 | |
---|
| 1125 | IonMatCouple ionMatCouple = std::make_pair(particle, material); |
---|
[1055] | 1126 | |
---|
[968] | 1127 | E[ionMatCouple] = energyRangeVector; |
---|
| 1128 | r[ionMatCouple] = rangeEnergyVector; |
---|
| 1129 | } |
---|
| 1130 | |
---|
[1055] | 1131 | // ######################################################################### |
---|
[968] | 1132 | |
---|
[1055] | 1133 | G4double G4IonParametrisedLossModel::GetRange( |
---|
| 1134 | const G4ParticleDefinition* particle, // Projectile |
---|
| 1135 | const G4Material* material, // Target Material |
---|
| 1136 | G4double kineticEnergy) { |
---|
| 1137 | |
---|
| 1138 | G4double range = 0.0; |
---|
| 1139 | |
---|
| 1140 | IonMatCouple couple = std::make_pair(particle, material); |
---|
| 1141 | |
---|
| 1142 | EnergyRangeTable::iterator iter = E.find(couple); |
---|
| 1143 | |
---|
| 1144 | if(iter == E.end()) { |
---|
| 1145 | G4cerr << "G4IonParametrisedLossModel::GetRange() No range vector found." |
---|
| 1146 | << G4endl; |
---|
| 1147 | |
---|
| 1148 | G4cout << " Ion-material pair: " << particle ->GetParticleName() |
---|
| 1149 | << " " << material -> GetName() |
---|
| 1150 | << G4endl |
---|
| 1151 | << " Available couples:" |
---|
| 1152 | << G4endl; |
---|
| 1153 | |
---|
| 1154 | EnergyRangeTable::iterator iter_beg = E.begin(); |
---|
| 1155 | EnergyRangeTable::iterator iter_end = E.end(); |
---|
| 1156 | |
---|
| 1157 | for(;iter_beg != iter_end; iter_beg++) { |
---|
| 1158 | IonMatCouple key = (*iter_beg).first; |
---|
| 1159 | |
---|
| 1160 | G4cout << " " << (key.first) -> GetParticleName() |
---|
| 1161 | << " " << (key.second) -> GetName() |
---|
| 1162 | << G4endl; |
---|
| 1163 | } |
---|
| 1164 | } |
---|
| 1165 | else { |
---|
| 1166 | G4PhysicsVector* energyRange = (*iter).second; |
---|
| 1167 | |
---|
| 1168 | if(energyRange != 0) { |
---|
| 1169 | G4bool b; |
---|
| 1170 | |
---|
| 1171 | // Computing range for kinetic energy: |
---|
| 1172 | range = energyRange -> GetValue(kineticEnergy, b); |
---|
| 1173 | } |
---|
| 1174 | } |
---|
| 1175 | |
---|
| 1176 | return range; |
---|
| 1177 | } |
---|
| 1178 | |
---|
| 1179 | // ######################################################################### |
---|
| 1180 | |
---|
[968] | 1181 | G4double G4IonParametrisedLossModel::ComputeLossForStep( |
---|
| 1182 | const G4Material* material, |
---|
| 1183 | const G4ParticleDefinition* particle, |
---|
| 1184 | G4double kineticEnergy, |
---|
| 1185 | G4double cutEnergy, |
---|
| 1186 | G4double stepLength) { |
---|
| 1187 | |
---|
| 1188 | G4double loss = 0.0; |
---|
| 1189 | |
---|
| 1190 | UpdateDEDXCache(particle, material, cutEnergy); |
---|
| 1191 | |
---|
| 1192 | G4PhysicsVector* energyRange = dedxCacheEnergyRange; |
---|
| 1193 | G4PhysicsVector* rangeEnergy = dedxCacheRangeEnergy; |
---|
| 1194 | |
---|
| 1195 | if(energyRange != 0 && rangeEnergy != 0) { |
---|
| 1196 | G4bool b; |
---|
| 1197 | |
---|
| 1198 | // Computing range for pre-step kinetic energy: |
---|
| 1199 | G4double range = energyRange -> GetValue(kineticEnergy, b); |
---|
| 1200 | |
---|
| 1201 | #ifdef PRINT_DEBUG |
---|
| 1202 | G4cout << "G4IonParametrisedLossModel::ComputeLossForStep() range = " |
---|
| 1203 | << range / mm << " mm, step = " << stepLength / mm << " mm" |
---|
| 1204 | << G4endl; |
---|
| 1205 | #endif |
---|
| 1206 | |
---|
| 1207 | // If range is smaller than step length, the loss is set to kinetic |
---|
| 1208 | // energy |
---|
| 1209 | if(range <= stepLength) loss = kineticEnergy; |
---|
| 1210 | else { |
---|
| 1211 | |
---|
| 1212 | G4double energy = rangeEnergy -> GetValue(range - stepLength, b); |
---|
| 1213 | |
---|
| 1214 | loss = kineticEnergy - energy; |
---|
| 1215 | |
---|
| 1216 | if(loss < 0.0) loss = 0.0; |
---|
| 1217 | } |
---|
[1055] | 1218 | } |
---|
[968] | 1219 | |
---|
[1055] | 1220 | return loss; |
---|
| 1221 | } |
---|
[968] | 1222 | |
---|
[1055] | 1223 | // ######################################################################### |
---|
| 1224 | |
---|
| 1225 | G4bool G4IonParametrisedLossModel::AddDEDXTable( |
---|
| 1226 | const G4String& name, |
---|
| 1227 | G4VIonDEDXTable* table, |
---|
| 1228 | G4VIonDEDXScalingAlgorithm* algorithm) { |
---|
| 1229 | |
---|
| 1230 | if(table == 0) { |
---|
| 1231 | G4cerr << "G4IonParametrisedLossModel::AddDEDXTable() Cannot " |
---|
| 1232 | << " add table: Invalid pointer." |
---|
| 1233 | << G4endl; |
---|
| 1234 | |
---|
| 1235 | return false; |
---|
[968] | 1236 | } |
---|
| 1237 | |
---|
[1055] | 1238 | // Checking uniqueness of name |
---|
| 1239 | LossTableList::iterator iter = lossTableList.begin(); |
---|
| 1240 | LossTableList::iterator iter_end = lossTableList.end(); |
---|
| 1241 | |
---|
| 1242 | for(;iter != iter_end; iter++) { |
---|
| 1243 | G4String tableName = (*iter) -> GetName(); |
---|
| 1244 | |
---|
| 1245 | if(tableName == name) { |
---|
| 1246 | G4cerr << "G4IonParametrisedLossModel::AddDEDXTable() Cannot " |
---|
| 1247 | << " add table: Name already exists." |
---|
| 1248 | << G4endl; |
---|
| 1249 | |
---|
| 1250 | return false; |
---|
| 1251 | } |
---|
| 1252 | } |
---|
| 1253 | |
---|
| 1254 | G4VIonDEDXScalingAlgorithm* scalingAlgorithm = algorithm; |
---|
| 1255 | if(scalingAlgorithm == 0) |
---|
| 1256 | scalingAlgorithm = new G4VIonDEDXScalingAlgorithm; |
---|
| 1257 | |
---|
| 1258 | G4IonDEDXHandler* handler = |
---|
| 1259 | new G4IonDEDXHandler(table, scalingAlgorithm, name); |
---|
| 1260 | |
---|
| 1261 | lossTableList.push_front(handler); |
---|
| 1262 | |
---|
| 1263 | return true; |
---|
[968] | 1264 | } |
---|
[1055] | 1265 | |
---|
| 1266 | // ######################################################################### |
---|
| 1267 | |
---|
| 1268 | G4bool G4IonParametrisedLossModel::RemoveDEDXTable( |
---|
| 1269 | const G4String& name) { |
---|
| 1270 | |
---|
| 1271 | LossTableList::iterator iter = lossTableList.begin(); |
---|
| 1272 | LossTableList::iterator iter_end = lossTableList.end(); |
---|
| 1273 | |
---|
| 1274 | for(;iter != iter_end; iter++) { |
---|
| 1275 | G4String tableName = (*iter) -> GetName(); |
---|
| 1276 | |
---|
| 1277 | if(tableName == name) { |
---|
| 1278 | delete (*iter); |
---|
| 1279 | |
---|
| 1280 | lossTableList.erase(iter); |
---|
| 1281 | return true; |
---|
| 1282 | } |
---|
| 1283 | } |
---|
| 1284 | |
---|
| 1285 | return false; |
---|
| 1286 | } |
---|
| 1287 | |
---|
| 1288 | // ######################################################################### |
---|
| 1289 | |
---|