[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[961] | 27 | // $Id: G4ePolarizedIonisation.cc,v 1.7 2008/10/30 22:34:23 schaelic Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 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: G4ePolarizedIonisation |
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| 35 | // |
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| 36 | // Author: A.Schaelicke on base of Vladimir Ivanchenko code |
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| 37 | // |
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| 38 | // Creation date: 10.11.2005 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // |
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| 42 | // 10-11-05, include polarization description (A.Schaelicke) |
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| 43 | // , create asymmetry table and determine interactionlength |
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| 44 | // , update polarized differential cross section |
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| 45 | // |
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| 46 | // 20-08-06, modified interface (A.Schaelicke) |
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| 47 | // 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke) |
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| 48 | // |
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| 49 | // Class Description: |
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| 50 | // |
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| 51 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 52 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 53 | |
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| 54 | #include "G4ePolarizedIonisation.hh" |
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| 55 | #include "G4Electron.hh" |
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| 56 | #include "G4UniversalFluctuation.hh" |
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| 57 | #include "G4BohrFluctuations.hh" |
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| 58 | #include "G4UnitsTable.hh" |
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| 59 | |
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| 60 | #include "G4PolarizedMollerBhabhaModel.hh" |
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| 61 | #include "G4ProductionCutsTable.hh" |
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| 62 | #include "G4PolarizationManager.hh" |
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| 63 | #include "G4PolarizationHelper.hh" |
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| 64 | #include "G4StokesVector.hh" |
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| 65 | |
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| 66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 67 | |
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| 68 | G4ePolarizedIonisation::G4ePolarizedIonisation(const G4String& name) |
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| 69 | : G4VEnergyLossProcess(name), |
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| 70 | theElectron(G4Electron::Electron()), |
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| 71 | isElectron(true), |
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| 72 | isInitialised(false), |
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| 73 | theAsymmetryTable(NULL), |
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| 74 | theTransverseAsymmetryTable(NULL) |
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| 75 | { |
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| 76 | verboseLevel=0; |
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| 77 | SetDEDXBinning(120); |
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| 78 | SetLambdaBinning(120); |
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| 79 | numBinAsymmetryTable=120; |
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| 80 | |
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| 81 | SetMinKinEnergy(0.1*keV); |
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| 82 | SetMaxKinEnergy(100.0*TeV); |
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| 83 | // PrintInfoDefinition(); |
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[961] | 84 | SetProcessSubType(fIonisation); |
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[819] | 85 | } |
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| 86 | |
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| 87 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 88 | |
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| 89 | G4ePolarizedIonisation::~G4ePolarizedIonisation() |
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| 90 | { |
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| 91 | if (theAsymmetryTable) { |
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| 92 | theAsymmetryTable->clearAndDestroy(); |
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| 93 | delete theAsymmetryTable; |
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| 94 | } |
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| 95 | if (theTransverseAsymmetryTable) { |
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| 96 | theTransverseAsymmetryTable->clearAndDestroy(); |
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| 97 | delete theTransverseAsymmetryTable; |
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| 98 | } |
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| 99 | } |
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| 100 | |
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| 101 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 102 | |
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| 103 | void G4ePolarizedIonisation::InitialiseEnergyLossProcess( |
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| 104 | const G4ParticleDefinition* part, |
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| 105 | const G4ParticleDefinition* /*part2*/) |
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| 106 | { |
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| 107 | if(!isInitialised) { |
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| 108 | |
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| 109 | if(part == G4Positron::Positron()) isElectron = false; |
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| 110 | SetSecondaryParticle(theElectron); |
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| 111 | |
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| 112 | |
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| 113 | |
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| 114 | flucModel = new G4UniversalFluctuation(); |
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| 115 | //flucModel = new G4BohrFluctuations(); |
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| 116 | |
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| 117 | // G4VEmModel* em = new G4MollerBhabhaModel(); |
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| 118 | emModel = new G4PolarizedMollerBhabhaModel; |
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| 119 | emModel->SetLowEnergyLimit(100*eV); |
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| 120 | emModel->SetHighEnergyLimit(100*TeV); |
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| 121 | AddEmModel(1, emModel, flucModel); |
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| 122 | |
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| 123 | isInitialised = true; |
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| 124 | } |
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| 125 | } |
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| 126 | |
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| 127 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 128 | |
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| 129 | void G4ePolarizedIonisation::PrintInfo() |
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| 130 | { |
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| 131 | G4cout << " Delta cross sections from Moller+Bhabha, " |
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| 132 | << "good description from 1 KeV to 100 GeV." |
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| 133 | << G4endl; |
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| 134 | } |
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| 135 | |
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| 136 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 137 | |
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| 138 | G4double G4ePolarizedIonisation::GetMeanFreePath(const G4Track& track, |
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| 139 | G4double s, |
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| 140 | G4ForceCondition* cond) |
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| 141 | { |
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| 142 | // *** get unploarised mean free path from lambda table *** |
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| 143 | G4double mfp = G4VEnergyLossProcess::GetMeanFreePath(track, s, cond); |
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| 144 | |
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| 145 | |
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| 146 | // *** get asymmetry, if target is polarized *** |
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| 147 | G4VPhysicalVolume* aPVolume = track.GetVolume(); |
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| 148 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
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| 149 | |
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| 150 | G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance(); |
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| 151 | const G4bool volumeIsPolarized = polarizationManger->IsPolarized(aLVolume); |
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| 152 | const G4StokesVector ePolarization = track.GetPolarization(); |
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| 153 | |
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| 154 | if (mfp != DBL_MAX && volumeIsPolarized && !ePolarization.IsZero()) { |
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| 155 | const G4DynamicParticle* aDynamicElectron = track.GetDynamicParticle(); |
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| 156 | const G4double eEnergy = aDynamicElectron->GetKineticEnergy(); |
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| 157 | const G4ParticleMomentum eDirection0 = aDynamicElectron->GetMomentumDirection(); |
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| 158 | |
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| 159 | G4StokesVector volumePolarization = polarizationManger->GetVolumePolarization(aLVolume); |
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| 160 | |
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| 161 | G4bool isOutRange; |
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| 162 | size_t idx = CurrentMaterialCutsCoupleIndex(); |
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| 163 | G4double lAsymmetry = (*theAsymmetryTable)(idx)-> |
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| 164 | GetValue(eEnergy, isOutRange); |
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| 165 | G4double tAsymmetry = (*theTransverseAsymmetryTable)(idx)-> |
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| 166 | GetValue(eEnergy, isOutRange); |
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| 167 | |
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| 168 | // calculate longitudinal spin component |
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| 169 | G4double polZZ = ePolarization.z()* |
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| 170 | volumePolarization*eDirection0; |
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| 171 | // calculate transvers spin components |
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| 172 | G4double polXX = ePolarization.x()* |
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| 173 | volumePolarization*G4PolarizationHelper::GetParticleFrameX(eDirection0); |
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| 174 | G4double polYY = ePolarization.y()* |
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| 175 | volumePolarization*G4PolarizationHelper::GetParticleFrameY(eDirection0); |
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| 176 | |
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| 177 | |
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| 178 | G4double impact = 1. + polZZ*lAsymmetry + (polXX + polYY)*tAsymmetry; |
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| 179 | // determine polarization dependent mean free path |
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| 180 | mfp /= impact; |
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| 181 | if (mfp <=0.) { |
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| 182 | G4cout <<"PV impact ( "<<polXX<<" , "<<polYY<<" , "<<polZZ<<" )"<<G4endl; |
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| 183 | G4cout << " impact on MFP is "<< impact <<G4endl; |
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| 184 | G4cout<<" lAsymmetry= "<<lAsymmetry<<" ("<<std::fabs(lAsymmetry)-1.<<")\n"; |
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| 185 | G4cout<<" tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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| 186 | } |
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| 187 | } |
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| 188 | |
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| 189 | return mfp; |
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| 190 | } |
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| 191 | |
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| 192 | G4double G4ePolarizedIonisation::PostStepGetPhysicalInteractionLength(const G4Track& track, |
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| 193 | G4double s, |
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| 194 | G4ForceCondition* cond) |
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| 195 | { |
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| 196 | // *** get unploarised mean free path from lambda table *** |
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| 197 | G4double mfp = G4VEnergyLossProcess::PostStepGetPhysicalInteractionLength(track, s, cond); |
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| 198 | |
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| 199 | |
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| 200 | // *** get asymmetry, if target is polarized *** |
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| 201 | G4VPhysicalVolume* aPVolume = track.GetVolume(); |
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| 202 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
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| 203 | |
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| 204 | G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance(); |
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| 205 | const G4bool volumeIsPolarized = polarizationManger->IsPolarized(aLVolume); |
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| 206 | const G4StokesVector ePolarization = track.GetPolarization(); |
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| 207 | |
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| 208 | if (mfp != DBL_MAX && volumeIsPolarized && !ePolarization.IsZero()) { |
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| 209 | const G4DynamicParticle* aDynamicElectron = track.GetDynamicParticle(); |
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| 210 | const G4double eEnergy = aDynamicElectron->GetKineticEnergy(); |
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| 211 | const G4ParticleMomentum eDirection0 = aDynamicElectron->GetMomentumDirection(); |
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| 212 | |
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| 213 | G4StokesVector volumePolarization = polarizationManger->GetVolumePolarization(aLVolume); |
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| 214 | |
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| 215 | G4bool isOutRange; |
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| 216 | size_t idx = CurrentMaterialCutsCoupleIndex(); |
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| 217 | G4double lAsymmetry = (*theAsymmetryTable)(idx)-> |
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| 218 | GetValue(eEnergy, isOutRange); |
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| 219 | G4double tAsymmetry = (*theTransverseAsymmetryTable)(idx)-> |
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| 220 | GetValue(eEnergy, isOutRange); |
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| 221 | |
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| 222 | // calculate longitudinal spin component |
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| 223 | G4double polZZ = ePolarization.z()* |
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| 224 | volumePolarization*eDirection0; |
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| 225 | // calculate transvers spin components |
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| 226 | G4double polXX = ePolarization.x()* |
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| 227 | volumePolarization*G4PolarizationHelper::GetParticleFrameX(eDirection0); |
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| 228 | G4double polYY = ePolarization.y()* |
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| 229 | volumePolarization*G4PolarizationHelper::GetParticleFrameY(eDirection0); |
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| 230 | |
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| 231 | |
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| 232 | G4double impact = 1. + polZZ*lAsymmetry + (polXX + polYY)*tAsymmetry; |
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| 233 | // determine polarization dependent mean free path |
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| 234 | mfp /= impact; |
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| 235 | if (mfp <=0.) { |
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| 236 | G4cout <<"PV impact ( "<<polXX<<" , "<<polYY<<" , "<<polZZ<<" )"<<G4endl; |
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| 237 | G4cout << " impact on MFP is "<< impact <<G4endl; |
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| 238 | G4cout<<" lAsymmetry= "<<lAsymmetry<<" ("<<std::fabs(lAsymmetry)-1.<<")\n"; |
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| 239 | G4cout<<" tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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| 240 | } |
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| 241 | } |
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| 242 | |
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| 243 | return mfp; |
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| 244 | } |
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| 245 | |
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| 246 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 247 | void G4ePolarizedIonisation::BuildPhysicsTable(const G4ParticleDefinition& part) |
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| 248 | { |
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| 249 | // *** build DEDX and (unpolarized) cross section tables |
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| 250 | G4VEnergyLossProcess::BuildPhysicsTable(part); |
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| 251 | // G4PhysicsTable* pt = |
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| 252 | // BuildDEDXTable(); |
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| 253 | |
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| 254 | |
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| 255 | // *** build asymmetry-table |
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| 256 | if (theAsymmetryTable) { |
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| 257 | theAsymmetryTable->clearAndDestroy(); delete theAsymmetryTable;} |
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| 258 | if (theTransverseAsymmetryTable) { |
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| 259 | theTransverseAsymmetryTable->clearAndDestroy(); delete theTransverseAsymmetryTable;} |
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| 260 | |
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| 261 | const G4ProductionCutsTable* theCoupleTable= |
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| 262 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 263 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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| 264 | |
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| 265 | theAsymmetryTable = new G4PhysicsTable(numOfCouples); |
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| 266 | theTransverseAsymmetryTable = new G4PhysicsTable(numOfCouples); |
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| 267 | |
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| 268 | for (size_t j=0 ; j < numOfCouples; j++ ) { |
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| 269 | // get cut value |
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| 270 | const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(j); |
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| 271 | |
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| 272 | G4double tcutmin = emModel->MinEnergyCut(&part, couple); |
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| 273 | G4double cut = (*theCoupleTable->GetEnergyCutsVector(1))[j]; |
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| 274 | cut = std::max(cut, tcutmin); |
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| 275 | |
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| 276 | //create physics vectors then fill it (same parameters as lambda vector) |
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| 277 | G4PhysicsVector * ptrVectorA = LambdaPhysicsVector(couple,cut); |
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| 278 | G4PhysicsVector * ptrVectorB = LambdaPhysicsVector(couple,cut); |
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| 279 | |
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| 280 | for (size_t i = 0 ; i < numBinAsymmetryTable ; i++ ) { |
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| 281 | G4double lowEdgeEnergy = ptrVectorA->GetLowEdgeEnergy(i); |
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| 282 | G4double tasm=0.; |
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| 283 | G4double asym = ComputeAsymmetry(lowEdgeEnergy, couple, part, cut, tasm); |
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| 284 | ptrVectorA->PutValue(i,asym); |
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| 285 | ptrVectorB->PutValue(i,tasm); |
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| 286 | } |
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| 287 | theAsymmetryTable->insertAt( j , ptrVectorA ) ; |
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| 288 | theTransverseAsymmetryTable->insertAt( j , ptrVectorB ) ; |
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| 289 | } |
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| 290 | |
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| 291 | } |
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| 292 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 293 | |
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| 294 | G4double G4ePolarizedIonisation::ComputeAsymmetry(G4double energy, |
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| 295 | const G4MaterialCutsCouple* couple, |
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| 296 | const G4ParticleDefinition& aParticle, |
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| 297 | G4double cut, |
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| 298 | G4double & tAsymmetry) |
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| 299 | { |
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| 300 | G4double lAsymmetry = 0.0; |
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| 301 | tAsymmetry = 0.0; |
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| 302 | if (isElectron) {lAsymmetry = tAsymmetry = -1.0;} |
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| 303 | |
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| 304 | // calculate polarized cross section |
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| 305 | theTargetPolarization=G4ThreeVector(0.,0.,1.); |
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| 306 | emModel->SetTargetPolarization(theTargetPolarization); |
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| 307 | emModel->SetBeamPolarization(theTargetPolarization); |
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| 308 | G4double sigma2=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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| 309 | |
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| 310 | // calculate transversely polarized cross section |
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| 311 | theTargetPolarization=G4ThreeVector(1.,0.,0.); |
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| 312 | emModel->SetTargetPolarization(theTargetPolarization); |
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| 313 | emModel->SetBeamPolarization(theTargetPolarization); |
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| 314 | G4double sigma3=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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| 315 | |
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| 316 | // calculate unpolarized cross section |
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| 317 | theTargetPolarization=G4ThreeVector(); |
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| 318 | emModel->SetTargetPolarization(theTargetPolarization); |
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| 319 | emModel->SetBeamPolarization(theTargetPolarization); |
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| 320 | G4double sigma0=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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| 321 | // determine assymmetries |
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| 322 | if (sigma0>0.) { |
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| 323 | lAsymmetry=sigma2/sigma0-1.; |
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| 324 | tAsymmetry=sigma3/sigma0-1.; |
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| 325 | } |
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| 326 | if (std::fabs(lAsymmetry)>1.) { |
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| 327 | G4cout<<" energy="<<energy<<"\n"; |
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| 328 | G4cout<<"WARNING lAsymmetry= "<<lAsymmetry<<" ("<<std::fabs(lAsymmetry)-1.<<")\n"; |
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| 329 | } |
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| 330 | if (std::fabs(tAsymmetry)>1.) { |
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| 331 | G4cout<<" energy="<<energy<<"\n"; |
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| 332 | G4cout<<"WARNING tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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| 333 | } |
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| 334 | // else { |
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| 335 | // G4cout<<" tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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| 336 | // } |
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| 337 | return lAsymmetry; |
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| 338 | } |
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| 339 | |
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| 340 | |
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