[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // $Id: G4PolarizedCompton.cc,v 1.7 2007/07/10 09:35:37 schaelic Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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| 29 | // |
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| 30 | // |
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| 31 | // File name: G4PolarizedCompton |
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| 32 | // |
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| 33 | // Author: Andreas Schaelicke |
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| 34 | // based on code by Michel Maire / Vladimir IVANTCHENKO |
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| 35 | // Class description |
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| 36 | // |
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| 37 | // modified version respecting media and beam polarization |
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| 38 | // using the stokes formalism |
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| 39 | // |
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| 40 | // Creation date: 01.05.2005 |
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| 41 | // |
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| 42 | // Modifications: |
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| 43 | // |
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| 44 | // 01-01-05, include polarization description (A.Stahl) |
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| 45 | // 01-01-05, create asymmetry table and determine interactionlength (A.Stahl) |
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| 46 | // 01-05-05, update handling of media polarization (A.Schalicke) |
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| 47 | // 01-05-05, update polarized differential cross section (A.Schalicke) |
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| 48 | // 20-05-05, added polarization transfer (A.Schalicke) |
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| 49 | // 10-06-05, transformation between different reference frames (A.Schalicke) |
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| 50 | // 17-10-05, correct reference frame dependence in GetMeanFreePath (A.Schalicke) |
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| 51 | // 26-07-06, cross section recalculated (P.Starovoitov) |
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| 52 | // 09-08-06, make it work under current geant4 release (A.Schalicke) |
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| 53 | // 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke) |
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| 54 | // ----------------------------------------------------------------------------- |
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| 55 | |
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| 56 | |
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| 57 | #include "G4PolarizedCompton.hh" |
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| 58 | #include "G4Electron.hh" |
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| 59 | |
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| 60 | #include "G4StokesVector.hh" |
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| 61 | #include "G4PolarizationManager.hh" |
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| 62 | #include "G4PolarizedComptonModel.hh" |
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| 63 | #include "G4ProductionCutsTable.hh" |
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| 64 | #include "G4PhysicsTableHelper.hh" |
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| 65 | #include "G4KleinNishinaCompton.hh" |
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| 66 | #include "G4PolarizedComptonModel.hh" |
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| 67 | |
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| 68 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 69 | |
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| 70 | G4PolarizedCompton::G4PolarizedCompton(const G4String& processName, |
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| 71 | G4ProcessType type): |
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| 72 | G4VEmProcess (processName, type), |
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| 73 | buildAsymmetryTable(true), |
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| 74 | useAsymmetryTable(true), |
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| 75 | isInitialised(false), |
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| 76 | selectedModel(0), |
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| 77 | mType(10), |
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| 78 | theAsymmetryTable(NULL) |
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| 79 | { |
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| 80 | SetLambdaBinning(90); |
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| 81 | SetMinKinEnergy(0.1*keV); |
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| 82 | SetMaxKinEnergy(100.0*GeV); |
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| 83 | } |
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| 84 | |
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| 85 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 86 | |
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| 87 | G4PolarizedCompton::~G4PolarizedCompton() |
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| 88 | { |
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| 89 | if (theAsymmetryTable) { |
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| 90 | theAsymmetryTable->clearAndDestroy(); |
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| 91 | delete theAsymmetryTable; |
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| 92 | } |
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| 93 | } |
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| 94 | |
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| 95 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 96 | |
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| 97 | void G4PolarizedCompton::InitialiseProcess(const G4ParticleDefinition*) |
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| 98 | { |
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| 99 | if(!isInitialised) { |
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| 100 | isInitialised = true; |
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| 101 | SetBuildTableFlag(true); |
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| 102 | SetSecondaryParticle(G4Electron::Electron()); |
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| 103 | G4double emin = MinKinEnergy(); |
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| 104 | G4double emax = MaxKinEnergy(); |
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| 105 | emModel = new G4PolarizedComptonModel(); |
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| 106 | if(0 == mType) selectedModel = new G4KleinNishinaCompton(); |
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| 107 | else if(10 == mType) selectedModel = emModel; |
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| 108 | selectedModel->SetLowEnergyLimit(emin); |
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| 109 | selectedModel->SetHighEnergyLimit(emax); |
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| 110 | AddEmModel(1, selectedModel); |
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| 111 | } |
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| 112 | } |
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| 113 | |
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| 114 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 115 | |
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| 116 | void G4PolarizedCompton::PrintInfo() |
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| 117 | { |
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| 118 | G4cout << " Total cross sections has a good parametrisation" |
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| 119 | << " from 10 KeV to (100/Z) GeV" |
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| 120 | << "\n Sampling according " << selectedModel->GetName() << " model" |
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| 121 | << G4endl; |
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| 122 | } |
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| 123 | |
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| 124 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 125 | |
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| 126 | void G4PolarizedCompton::SetModel(const G4String& s) |
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| 127 | { |
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| 128 | if(s == "Klein-Nishina") mType = 0; |
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| 129 | if(s == "Polarized-Compton") mType = 10; |
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| 130 | } |
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| 131 | |
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| 132 | |
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| 133 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 134 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 135 | |
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| 136 | |
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| 137 | |
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| 138 | G4double G4PolarizedCompton::GetMeanFreePath( |
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| 139 | const G4Track& aTrack, |
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| 140 | G4double previousStepSize, |
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| 141 | G4ForceCondition* condition) |
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| 142 | { |
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| 143 | // *** get unploarised mean free path from lambda table *** |
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| 144 | G4double mfp = G4VEmProcess::GetMeanFreePath(aTrack, previousStepSize, condition); |
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| 145 | |
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| 146 | |
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| 147 | if (theAsymmetryTable && useAsymmetryTable) { |
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| 148 | // *** get asymmetry, if target is polarized *** |
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| 149 | const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle(); |
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| 150 | const G4double GammaEnergy = aDynamicGamma->GetKineticEnergy(); |
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| 151 | const G4StokesVector GammaPolarization = aTrack.GetPolarization(); |
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| 152 | const G4ParticleMomentum GammaDirection0 = aDynamicGamma->GetMomentumDirection(); |
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| 153 | |
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| 154 | G4Material* aMaterial = aTrack.GetMaterial(); |
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| 155 | G4VPhysicalVolume* aPVolume = aTrack.GetVolume(); |
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| 156 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
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| 157 | |
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| 158 | // G4Material* bMaterial = aLVolume->GetMaterial(); |
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| 159 | G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance(); |
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| 160 | |
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| 161 | const G4bool VolumeIsPolarized = polarizationManger->IsPolarized(aLVolume); |
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| 162 | G4StokesVector ElectronPolarization = polarizationManger->GetVolumePolarization(aLVolume); |
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| 163 | |
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| 164 | if (!VolumeIsPolarized || mfp == DBL_MAX) return mfp; |
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| 165 | |
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| 166 | if (verboseLevel>=2) { |
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| 167 | |
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| 168 | G4cout << " Mom " << GammaDirection0 << G4endl; |
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| 169 | G4cout << " Polarization " << GammaPolarization << G4endl; |
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| 170 | G4cout << " MaterialPol. " << ElectronPolarization << G4endl; |
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| 171 | G4cout << " Phys. Volume " << aPVolume->GetName() << G4endl; |
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| 172 | G4cout << " Log. Volume " << aLVolume->GetName() << G4endl; |
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| 173 | G4cout << " Material " << aMaterial << G4endl; |
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| 174 | } |
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| 175 | |
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| 176 | G4int midx= CurrentMaterialCutsCoupleIndex(); |
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| 177 | G4PhysicsVector * aVector=(*theAsymmetryTable)(midx); |
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| 178 | |
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| 179 | G4double asymmetry=0; |
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| 180 | if (aVector) { |
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| 181 | G4bool isOutRange; |
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| 182 | asymmetry = aVector->GetValue(GammaEnergy, isOutRange); |
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| 183 | } else { |
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| 184 | G4cout << " MaterialIndex " << midx << " is out of range \n"; |
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| 185 | asymmetry=0; |
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| 186 | } |
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| 187 | |
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| 188 | // we have to determine angle between particle motion |
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| 189 | // and target polarisation here |
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| 190 | // circ pol * Vec(ElectronPol)*Vec(PhotonMomentum) |
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| 191 | // both vectors in global reference frame |
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| 192 | |
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| 193 | G4double pol=ElectronPolarization*GammaDirection0; |
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| 194 | |
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| 195 | G4double polProduct = GammaPolarization.p3() * pol; |
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| 196 | mfp *= 1. / ( 1. + polProduct * asymmetry ); |
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| 197 | |
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| 198 | if (verboseLevel>=2) { |
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| 199 | G4cout << " MeanFreePath: " << mfp / mm << " mm " << G4endl; |
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| 200 | G4cout << " Asymmetry: " << asymmetry << G4endl; |
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| 201 | G4cout << " PolProduct: " << polProduct << G4endl; |
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| 202 | } |
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| 203 | } |
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| 204 | |
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| 205 | return mfp; |
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| 206 | } |
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| 207 | |
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| 208 | G4double G4PolarizedCompton::PostStepGetPhysicalInteractionLength( |
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| 209 | const G4Track& aTrack, |
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| 210 | G4double previousStepSize, |
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| 211 | G4ForceCondition* condition) |
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| 212 | { |
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| 213 | // *** get unploarised mean free path from lambda table *** |
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| 214 | G4double mfp = G4VEmProcess::PostStepGetPhysicalInteractionLength(aTrack, previousStepSize, condition); |
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| 215 | |
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| 216 | |
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| 217 | if (theAsymmetryTable && useAsymmetryTable) { |
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| 218 | // *** get asymmetry, if target is polarized *** |
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| 219 | const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle(); |
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| 220 | const G4double GammaEnergy = aDynamicGamma->GetKineticEnergy(); |
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| 221 | const G4StokesVector GammaPolarization = aTrack.GetPolarization(); |
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| 222 | const G4ParticleMomentum GammaDirection0 = aDynamicGamma->GetMomentumDirection(); |
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| 223 | |
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| 224 | G4Material* aMaterial = aTrack.GetMaterial(); |
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| 225 | G4VPhysicalVolume* aPVolume = aTrack.GetVolume(); |
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| 226 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
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| 227 | |
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| 228 | // G4Material* bMaterial = aLVolume->GetMaterial(); |
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| 229 | G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance(); |
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| 230 | |
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| 231 | const G4bool VolumeIsPolarized = polarizationManger->IsPolarized(aLVolume); |
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| 232 | G4StokesVector ElectronPolarization = polarizationManger->GetVolumePolarization(aLVolume); |
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| 233 | |
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| 234 | if (!VolumeIsPolarized || mfp == DBL_MAX) return mfp; |
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| 235 | |
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| 236 | if (verboseLevel>=2) { |
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| 237 | |
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| 238 | G4cout << " Mom " << GammaDirection0 << G4endl; |
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| 239 | G4cout << " Polarization " << GammaPolarization << G4endl; |
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| 240 | G4cout << " MaterialPol. " << ElectronPolarization << G4endl; |
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| 241 | G4cout << " Phys. Volume " << aPVolume->GetName() << G4endl; |
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| 242 | G4cout << " Log. Volume " << aLVolume->GetName() << G4endl; |
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| 243 | G4cout << " Material " << aMaterial << G4endl; |
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| 244 | } |
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| 245 | |
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| 246 | G4int midx= CurrentMaterialCutsCoupleIndex(); |
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| 247 | G4PhysicsVector * aVector=(*theAsymmetryTable)(midx); |
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| 248 | |
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| 249 | G4double asymmetry=0; |
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| 250 | if (aVector) { |
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| 251 | G4bool isOutRange; |
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| 252 | asymmetry = aVector->GetValue(GammaEnergy, isOutRange); |
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| 253 | } else { |
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| 254 | G4cout << " MaterialIndex " << midx << " is out of range \n"; |
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| 255 | asymmetry=0; |
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| 256 | } |
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| 257 | |
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| 258 | // we have to determine angle between particle motion |
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| 259 | // and target polarisation here |
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| 260 | // circ pol * Vec(ElectronPol)*Vec(PhotonMomentum) |
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| 261 | // both vectors in global reference frame |
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| 262 | |
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| 263 | G4double pol=ElectronPolarization*GammaDirection0; |
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| 264 | |
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| 265 | G4double polProduct = GammaPolarization.p3() * pol; |
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| 266 | mfp *= 1. / ( 1. + polProduct * asymmetry ); |
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| 267 | |
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| 268 | if (verboseLevel>=2) { |
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| 269 | G4cout << " MeanFreePath: " << mfp / mm << " mm " << G4endl; |
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| 270 | G4cout << " Asymmetry: " << asymmetry << G4endl; |
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| 271 | G4cout << " PolProduct: " << polProduct << G4endl; |
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| 272 | } |
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| 273 | } |
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| 274 | |
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| 275 | return mfp; |
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| 276 | } |
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| 277 | |
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| 278 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 279 | |
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| 280 | void G4PolarizedCompton::PreparePhysicsTable(const G4ParticleDefinition& part) |
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| 281 | { |
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| 282 | G4VEmProcess::PreparePhysicsTable(part); |
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| 283 | if(buildAsymmetryTable) |
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| 284 | theAsymmetryTable = G4PhysicsTableHelper::PreparePhysicsTable(theAsymmetryTable); |
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| 285 | } |
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| 286 | |
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| 287 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 288 | |
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| 289 | |
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| 290 | void G4PolarizedCompton::BuildPhysicsTable(const G4ParticleDefinition& part) |
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| 291 | { |
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| 292 | // *** build (unpolarized) cross section tables (Lambda) |
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| 293 | G4VEmProcess::BuildPhysicsTable(part); |
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| 294 | if(buildAsymmetryTable) |
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| 295 | BuildAsymmetryTable(part); |
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| 296 | } |
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| 297 | |
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| 298 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 299 | |
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| 300 | |
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| 301 | void G4PolarizedCompton::BuildAsymmetryTable(const G4ParticleDefinition& part) |
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| 302 | { |
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| 303 | // Access to materials |
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| 304 | const G4ProductionCutsTable* theCoupleTable= |
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| 305 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 306 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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| 307 | for(size_t i=0; i<numOfCouples; ++i) { |
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| 308 | if (!theAsymmetryTable) break; |
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| 309 | if (theAsymmetryTable->GetFlag(i)) { |
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| 310 | |
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| 311 | // create physics vector and fill it |
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| 312 | const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i); |
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| 313 | // use same parameters as for lambda |
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| 314 | G4PhysicsVector* aVector = LambdaPhysicsVector(couple); |
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| 315 | // modelManager->FillLambdaVector(aVector, couple, startFromNull); |
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| 316 | |
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| 317 | for (G4int j = 0 ; j < LambdaBinning() ; ++j ) { |
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| 318 | G4double lowEdgeEnergy = aVector->GetLowEdgeEnergy(j); |
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| 319 | G4double tasm=0.; |
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| 320 | G4double asym = ComputeAsymmetry(lowEdgeEnergy, couple, part, 0., tasm); |
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| 321 | aVector->PutValue(j,asym); |
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| 322 | } |
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| 323 | |
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| 324 | G4PhysicsTableHelper::SetPhysicsVector(theAsymmetryTable, i, aVector); |
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| 325 | } |
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| 326 | } |
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| 327 | |
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| 328 | } |
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| 329 | |
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| 330 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 331 | |
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| 332 | |
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| 333 | G4double G4PolarizedCompton::ComputeAsymmetry(G4double energy, |
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| 334 | const G4MaterialCutsCouple* couple, |
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| 335 | const G4ParticleDefinition& aParticle, |
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| 336 | G4double cut, |
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| 337 | G4double & tAsymmetry) |
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| 338 | { |
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| 339 | G4double lAsymmetry = 0.0; |
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| 340 | tAsymmetry=0; |
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| 341 | |
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| 342 | // |
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| 343 | // calculate polarized cross section |
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| 344 | // |
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| 345 | G4ThreeVector thePolarization=G4ThreeVector(0.,0.,1.); |
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| 346 | emModel->SetTargetPolarization(thePolarization); |
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| 347 | emModel->SetBeamPolarization(thePolarization); |
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| 348 | G4double sigma2=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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| 349 | |
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| 350 | // |
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| 351 | // calculate unpolarized cross section |
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| 352 | // |
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| 353 | thePolarization=G4ThreeVector(); |
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| 354 | emModel->SetTargetPolarization(thePolarization); |
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| 355 | emModel->SetBeamPolarization(thePolarization); |
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| 356 | G4double sigma0=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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| 357 | |
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| 358 | // determine assymmetries |
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| 359 | if (sigma0>0.) { |
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| 360 | lAsymmetry=sigma2/sigma0-1.; |
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| 361 | } |
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| 362 | return lAsymmetry; |
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| 363 | } |
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| 364 | |
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| 365 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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