[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // $Id: G4ionGasIonisation.cc,v 1.4 2008/01/14 11:59:45 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 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: G4ionGasIonisation |
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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: 23.07.2007 |
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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 | // |
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| 45 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 46 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 47 | |
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| 48 | #include "G4ionGasIonisation.hh" |
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| 49 | #include "G4Electron.hh" |
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| 50 | #include "G4Proton.hh" |
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| 51 | #include "G4GenericIon.hh" |
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| 52 | |
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| 53 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 54 | |
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| 55 | using namespace std; |
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| 56 | |
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| 57 | G4ionGasIonisation::G4ionGasIonisation(const G4String& name) |
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| 58 | : G4ionIonisation(name), |
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| 59 | currParticle(0), |
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| 60 | baseParticle(0), |
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| 61 | initialised(false) |
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| 62 | { |
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| 63 | atomXS = CLHEP::pi*CLHEP::Bohr_radius*CLHEP::Bohr_radius; |
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| 64 | verboseLevel = 1; |
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| 65 | } |
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| 66 | |
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| 67 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 68 | |
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| 69 | G4ionGasIonisation::~G4ionGasIonisation() |
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| 70 | {} |
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| 71 | |
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| 72 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 73 | |
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| 74 | void G4ionGasIonisation::InitialiseEnergyLossProcess( |
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| 75 | const G4ParticleDefinition* part, |
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| 76 | const G4ParticleDefinition* bpart) |
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| 77 | { |
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| 78 | G4ionIonisation::InitialiseEnergyLossProcess(part, bpart); |
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| 79 | if(initialised) return; |
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| 80 | |
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| 81 | currParticle = part; |
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| 82 | |
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| 83 | if(part == bpart || part == G4GenericIon::GenericIon()) baseParticle = 0; |
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| 84 | else if(bpart == 0) baseParticle = G4GenericIon::GenericIon(); |
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| 85 | else baseParticle = bpart; |
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| 86 | |
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| 87 | if(baseParticle) basePartMass = baseParticle->GetPDGMass(); |
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| 88 | else basePartMass = currParticle->GetPDGMass(); |
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| 89 | |
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| 90 | initialised = true; |
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| 91 | } |
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| 92 | |
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| 93 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 94 | |
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| 95 | void G4ionGasIonisation::PrintInfo() |
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| 96 | { |
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| 97 | G4ionIonisation::PrintInfo(); |
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| 98 | G4cout << " Version of ion process with simulation discrete ion/media change exchange." |
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| 99 | << G4endl; |
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| 100 | } |
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| 101 | |
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| 102 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 103 | |
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| 104 | void G4ionGasIonisation::InitialiseMassCharge(const G4Track& track) |
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| 105 | { |
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| 106 | // First step of an ion |
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| 107 | if(track.GetCurrentStepNumber() == 1) { |
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| 108 | currParticle = track.GetDefinition(); |
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| 109 | ionZ = G4int(currParticle->GetPDGCharge()/eplus + 0.5); |
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| 110 | currentIonZ = G4int(track.GetDynamicParticle()->GetCharge()/eplus + 0.5); |
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| 111 | currMassRatio = basePartMass/currParticle->GetPDGMass(); |
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| 112 | } |
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| 113 | // any step |
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| 114 | G4double q = eplus*currentIonZ; |
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| 115 | SetDynamicMassCharge(currMassRatio, q*q); |
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| 116 | preStepKinEnergy = track.GetKineticEnergy(); |
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| 117 | } |
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| 118 | |
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| 119 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 120 | |
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| 121 | void G4ionGasIonisation::CorrectionsAlongStep(const G4MaterialCutsCouple* couple, |
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| 122 | const G4DynamicParticle* dp, |
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| 123 | G4double& eloss, |
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| 124 | G4double& s) |
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| 125 | { |
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| 126 | const G4ParticleDefinition* part = dp->GetDefinition(); |
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| 127 | const G4Material* mat = couple->GetMaterial(); |
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| 128 | // add corrections |
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| 129 | if(eloss < preStepKinEnergy) { |
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| 130 | |
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| 131 | // use Bethe-Bloch with corrections |
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| 132 | if(preStepKinEnergy*currMassRatio > BetheBlochEnergyThreshold()) |
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| 133 | eloss += s*corr->HighOrderCorrections(part,mat,preStepKinEnergy); |
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| 134 | |
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| 135 | // effective number of collisions |
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| 136 | G4double x = mat->GetElectronDensity()*s*atomXS; |
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| 137 | // equilibrium charge |
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| 138 | G4double q = fParticleChange.GetProposedCharge(); |
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| 139 | |
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| 140 | // sample charge change during the step |
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| 141 | fParticleChange.SetProposedCharge(SampleChargeAfterStep(q, x)); |
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| 142 | } |
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| 143 | |
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| 144 | // use nuclear stopping |
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| 145 | if(NuclearStoppingFlag()) { |
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| 146 | G4double nloss = s*corr->NuclearDEDX(part,mat,preStepKinEnergy - eloss*0.5); |
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| 147 | eloss += nloss; |
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| 148 | fParticleChange.ProposeNonIonizingEnergyDeposit(nloss); |
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| 149 | } |
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| 150 | } |
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| 151 | |
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| 152 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 153 | |
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| 154 | G4double G4ionGasIonisation::SampleChargeAfterStep(G4double qeff, G4double xeff) |
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| 155 | { |
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| 156 | // qeff - equilibrium charge |
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| 157 | // xeff - effective number of collisions |
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| 158 | // q - current charge |
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| 159 | G4double q = eplus*currentIonZ; |
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| 160 | if(verboseLevel > 1) G4cout << "G4ionGasIonisation: Q1= " << currentIonZ |
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| 161 | << " Qeff= " << qeff/eplus << " Neff= " << xeff |
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| 162 | << G4endl; |
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| 163 | return q; |
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| 164 | } |
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| 165 | |
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| 166 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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