[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 | // |
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[1192] | 28 | // $Id: G4LowEnergyRayleigh.cc,v 1.40 2009/06/11 15:47:08 mantero Exp $ |
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[1347] | 29 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[819] | 30 | // |
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| 31 | // Author: A. Forti |
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| 32 | // Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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| 33 | // |
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| 34 | // History: |
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| 35 | // -------- |
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| 36 | // Added Livermore data table construction methods A. Forti |
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| 37 | // Added BuildMeanFreePath A. Forti |
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| 38 | // Added PostStepDoIt A. Forti |
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| 39 | // Added SelectRandomAtom A. Forti |
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| 40 | // Added map of the elements A.Forti |
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| 41 | // 24.04.01 V.Ivanchenko remove RogueWave |
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| 42 | // 11.08.2001 MGP - Major revision according to a design iteration |
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| 43 | // 06.10.2001 MGP - Added strategy to test range for secondary generation |
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| 44 | // 05.06.2002 F.Longo and G.Depaola - bug fixed in angular distribution |
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| 45 | // 20.10.2002 G. Depaola - Change sampling method of theta |
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| 46 | // 22.01.2003 V.Ivanchenko - Cut per region |
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| 47 | // 24.04.2003 V.Ivanchenko - Cut per region mfpt |
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| 48 | // |
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| 49 | // -------------------------------------------------------------------- |
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| 50 | |
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| 51 | #include "G4LowEnergyRayleigh.hh" |
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| 52 | #include "Randomize.hh" |
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| 53 | #include "G4ParticleDefinition.hh" |
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| 54 | #include "G4Track.hh" |
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| 55 | #include "G4Step.hh" |
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| 56 | #include "G4ForceCondition.hh" |
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| 57 | #include "G4Gamma.hh" |
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| 58 | #include "G4Electron.hh" |
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| 59 | #include "G4DynamicParticle.hh" |
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| 60 | #include "G4VParticleChange.hh" |
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| 61 | #include "G4ThreeVector.hh" |
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| 62 | #include "G4VCrossSectionHandler.hh" |
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| 63 | #include "G4CrossSectionHandler.hh" |
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| 64 | #include "G4VEMDataSet.hh" |
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| 65 | #include "G4CompositeEMDataSet.hh" |
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| 66 | #include "G4VDataSetAlgorithm.hh" |
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| 67 | #include "G4LogLogInterpolation.hh" |
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| 68 | |
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| 69 | #include "G4MaterialCutsCouple.hh" |
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| 70 | |
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| 71 | G4LowEnergyRayleigh::G4LowEnergyRayleigh(const G4String& processName) |
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| 72 | : G4VDiscreteProcess(processName), |
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| 73 | lowEnergyLimit(250*eV), |
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| 74 | highEnergyLimit(100*GeV), |
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| 75 | intrinsicLowEnergyLimit(10*eV), |
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| 76 | intrinsicHighEnergyLimit(100*GeV) |
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| 77 | { |
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| 78 | if (lowEnergyLimit < intrinsicLowEnergyLimit || |
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| 79 | highEnergyLimit > intrinsicHighEnergyLimit) |
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| 80 | { |
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| 81 | G4Exception("G4LowEnergyRayleigh::G4LowEnergyRayleigh - energy limit outside intrinsic process validity range"); |
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| 82 | } |
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| 83 | |
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| 84 | crossSectionHandler = new G4CrossSectionHandler(); |
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| 85 | |
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| 86 | G4VDataSetAlgorithm* ffInterpolation = new G4LogLogInterpolation; |
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| 87 | G4String formFactorFile = "rayl/re-ff-"; |
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| 88 | formFactorData = new G4CompositeEMDataSet(ffInterpolation,1.,1.); |
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| 89 | formFactorData->LoadData(formFactorFile); |
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| 90 | |
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| 91 | meanFreePathTable = 0; |
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| 92 | |
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| 93 | if (verboseLevel > 0) |
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| 94 | { |
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| 95 | G4cout << GetProcessName() << " is created " << G4endl |
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| 96 | << "Energy range: " |
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| 97 | << lowEnergyLimit / keV << " keV - " |
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| 98 | << highEnergyLimit / GeV << " GeV" |
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| 99 | << G4endl; |
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| 100 | } |
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[1055] | 101 | |
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| 102 | G4cout << G4endl; |
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| 103 | G4cout << "*******************************************************************************" << G4endl; |
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| 104 | G4cout << "*******************************************************************************" << G4endl; |
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| 105 | G4cout << " The class G4LowEnergyRayleigh is NOT SUPPORTED ANYMORE. " << G4endl; |
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| 106 | G4cout << " It will be REMOVED with the next major release of Geant4. " << G4endl; |
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| 107 | G4cout << " Please consult: https://twiki.cern.ch/twiki/bin/view/Geant4/LoweProcesses" << G4endl; |
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| 108 | G4cout << "*******************************************************************************" << G4endl; |
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| 109 | G4cout << "*******************************************************************************" << G4endl; |
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| 110 | G4cout << G4endl; |
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[819] | 111 | } |
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| 112 | |
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| 113 | G4LowEnergyRayleigh::~G4LowEnergyRayleigh() |
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| 114 | { |
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| 115 | delete meanFreePathTable; |
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| 116 | delete crossSectionHandler; |
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| 117 | delete formFactorData; |
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| 118 | } |
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| 119 | |
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| 120 | void G4LowEnergyRayleigh::BuildPhysicsTable(const G4ParticleDefinition& ) |
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| 121 | { |
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| 122 | |
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| 123 | crossSectionHandler->Clear(); |
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| 124 | G4String crossSectionFile = "rayl/re-cs-"; |
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| 125 | crossSectionHandler->LoadData(crossSectionFile); |
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| 126 | |
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| 127 | delete meanFreePathTable; |
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| 128 | meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials(); |
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| 129 | } |
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| 130 | |
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| 131 | G4VParticleChange* G4LowEnergyRayleigh::PostStepDoIt(const G4Track& aTrack, |
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| 132 | const G4Step& aStep) |
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| 133 | { |
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| 134 | |
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| 135 | aParticleChange.Initialize(aTrack); |
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| 136 | |
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| 137 | const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle(); |
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| 138 | G4double photonEnergy0 = incidentPhoton->GetKineticEnergy(); |
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| 139 | |
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| 140 | if (photonEnergy0 <= lowEnergyLimit) |
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| 141 | { |
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| 142 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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| 143 | aParticleChange.ProposeEnergy(0.); |
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| 144 | aParticleChange.ProposeLocalEnergyDeposit(photonEnergy0); |
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| 145 | return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep); |
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| 146 | } |
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| 147 | |
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| 148 | // G4double e0m = photonEnergy0 / electron_mass_c2 ; |
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| 149 | G4ParticleMomentum photonDirection0 = incidentPhoton->GetMomentumDirection(); |
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| 150 | |
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| 151 | // Select randomly one element in the current material |
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| 152 | const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple(); |
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| 153 | G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy0); |
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| 154 | |
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| 155 | // Sample the angle of the scattered photon |
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| 156 | |
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| 157 | G4double wlPhoton = h_Planck*c_light/photonEnergy0; |
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| 158 | |
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| 159 | G4double gReject,x,dataFormFactor; |
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| 160 | G4double randomFormFactor; |
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| 161 | G4double cosTheta; |
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| 162 | G4double sinTheta; |
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| 163 | G4double fcostheta; |
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| 164 | |
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| 165 | do |
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| 166 | { |
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| 167 | do |
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| 168 | { |
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| 169 | cosTheta = 2. * G4UniformRand() - 1.; |
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| 170 | fcostheta = ( 1. + cosTheta*cosTheta)/2.; |
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| 171 | } while (fcostheta < G4UniformRand()); |
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| 172 | |
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| 173 | G4double sinThetaHalf = std::sqrt((1. - cosTheta) / 2.); |
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| 174 | x = sinThetaHalf / (wlPhoton/cm); |
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| 175 | if (x > 1.e+005) |
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| 176 | dataFormFactor = formFactorData->FindValue(x,Z-1); |
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| 177 | else |
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| 178 | dataFormFactor = formFactorData->FindValue(0.,Z-1); |
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| 179 | randomFormFactor = G4UniformRand() * Z * Z; |
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| 180 | sinTheta = std::sqrt(1. - cosTheta*cosTheta); |
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| 181 | gReject = dataFormFactor * dataFormFactor; |
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| 182 | |
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| 183 | } while( gReject < randomFormFactor); |
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| 184 | |
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| 185 | // Scattered photon angles. ( Z - axis along the parent photon) |
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| 186 | G4double phi = twopi * G4UniformRand() ; |
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| 187 | G4double dirX = sinTheta*std::cos(phi); |
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| 188 | G4double dirY = sinTheta*std::sin(phi); |
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| 189 | G4double dirZ = cosTheta; |
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| 190 | |
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| 191 | // Update G4VParticleChange for the scattered photon |
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| 192 | G4ThreeVector photonDirection1(dirX, dirY, dirZ); |
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| 193 | |
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| 194 | photonDirection1.rotateUz(photonDirection0); |
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| 195 | aParticleChange.ProposeEnergy(photonEnergy0); |
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| 196 | aParticleChange.ProposeMomentumDirection(photonDirection1); |
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| 197 | |
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| 198 | aParticleChange.SetNumberOfSecondaries(0); |
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| 199 | |
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| 200 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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| 201 | } |
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| 202 | |
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| 203 | G4bool G4LowEnergyRayleigh::IsApplicable(const G4ParticleDefinition& particle) |
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| 204 | { |
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| 205 | return ( &particle == G4Gamma::Gamma() ); |
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| 206 | } |
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| 207 | |
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| 208 | G4double G4LowEnergyRayleigh::GetMeanFreePath(const G4Track& track, |
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| 209 | G4double, // previousStepSize |
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| 210 | G4ForceCondition*) |
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| 211 | { |
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| 212 | const G4DynamicParticle* photon = track.GetDynamicParticle(); |
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| 213 | G4double energy = photon->GetKineticEnergy(); |
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| 214 | const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple(); |
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| 215 | size_t materialIndex = couple->GetIndex(); |
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| 216 | |
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| 217 | G4double meanFreePath; |
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| 218 | if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex); |
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| 219 | else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX; |
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| 220 | else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex); |
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| 221 | return meanFreePath; |
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| 222 | } |
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