[966] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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[1196] | 26 | // $Id: G4ContinuousGainOfEnergy.cc,v 1.4 2009/11/20 10:31:20 ldesorgh Exp $ |
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[1228] | 27 | // GEANT4 tag $Name: geant4-09-03 $ |
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[1196] | 28 | // |
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[966] | 29 | #include "G4ContinuousGainOfEnergy.hh" |
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| 30 | #include "G4Step.hh" |
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| 31 | #include "G4ParticleDefinition.hh" |
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| 32 | #include "G4VEmModel.hh" |
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| 33 | #include "G4VEmFluctuationModel.hh" |
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| 34 | #include "G4VParticleChange.hh" |
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| 35 | #include "G4UnitsTable.hh" |
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[1196] | 36 | #include "G4AdjointCSManager.hh" |
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| 37 | #include "G4LossTableManager.hh" |
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[966] | 38 | |
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| 39 | |
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| 40 | /////////////////////////////////////////////////////// |
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| 41 | // |
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| 42 | G4ContinuousGainOfEnergy::G4ContinuousGainOfEnergy(const G4String& name, |
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| 43 | G4ProcessType type): G4VContinuousProcess(name, type) |
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| 44 | { |
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| 45 | |
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[1196] | 46 | |
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[966] | 47 | linLossLimit=0.05; |
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| 48 | lossFluctuationArePossible =true; |
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| 49 | lossFluctuationFlag=true; |
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| 50 | is_integral = false; |
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| 51 | |
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[1196] | 52 | //Will be properly set in SetDirectParticle() |
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| 53 | IsIon=false; |
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| 54 | massRatio =1.; |
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| 55 | chargeSqRatio=1.; |
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| 56 | preStepChargeSqRatio=1.; |
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| 57 | |
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| 58 | |
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| 59 | |
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| 60 | |
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| 61 | |
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[966] | 62 | } |
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| 63 | |
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| 64 | /////////////////////////////////////////////////////// |
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| 65 | // |
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| 66 | G4ContinuousGainOfEnergy::~G4ContinuousGainOfEnergy() |
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| 67 | { |
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| 68 | |
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| 69 | } |
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| 70 | /////////////////////////////////////////////////////// |
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| 71 | // |
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| 72 | |
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| 73 | void G4ContinuousGainOfEnergy::PreparePhysicsTable( |
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| 74 | const G4ParticleDefinition& ) |
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| 75 | {//theDirectEnergyLossProcess->PreparePhysicsTable(part); |
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| 76 | |
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| 77 | ; |
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| 78 | } |
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| 79 | |
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| 80 | /////////////////////////////////////////////////////// |
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| 81 | // |
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| 82 | |
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| 83 | void G4ContinuousGainOfEnergy::BuildPhysicsTable(const G4ParticleDefinition&) |
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| 84 | {//theDirectEnergyLossProcess->BuildPhysicsTable(part); |
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| 85 | ; |
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| 86 | } |
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| 87 | |
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[1196] | 88 | /////////////////////////////////////////////////////// |
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| 89 | // |
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| 90 | void G4ContinuousGainOfEnergy::SetDirectParticle(G4ParticleDefinition* p) |
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| 91 | {theDirectPartDef=p; |
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| 92 | if (theDirectPartDef->GetParticleType()== "nucleus") { |
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| 93 | IsIon=true; |
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| 94 | massRatio = proton_mass_c2/theDirectPartDef->GetPDGMass(); |
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| 95 | G4double q=theDirectPartDef->GetPDGCharge(); |
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| 96 | chargeSqRatio=q*q; |
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| 97 | |
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| 98 | |
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| 99 | } |
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| 100 | |
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| 101 | } |
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[966] | 102 | |
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| 103 | /////////////////////////////////////////////////////// |
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| 104 | // |
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| 105 | // |
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| 106 | G4VParticleChange* G4ContinuousGainOfEnergy::AlongStepDoIt(const G4Track& track, |
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| 107 | const G4Step& step) |
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| 108 | { |
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| 109 | |
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[1196] | 110 | //Caution in this method the step length should be the true step length |
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| 111 | // A problem is that this is compute by the multiple scattering that does not know the energy at the end of the adjoint step. This energy is used during the |
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| 112 | //Forward sim. Nothing we can really do against that at this time. This is inherent to the MS method |
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| 113 | // |
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| 114 | |
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| 115 | |
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| 116 | |
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[966] | 117 | aParticleChange.Initialize(track); |
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| 118 | |
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| 119 | // Get the actual (true) Step length |
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| 120 | //---------------------------------- |
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| 121 | G4double length = step.GetStepLength(); |
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| 122 | G4double degain = 0.0; |
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[1196] | 123 | |
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| 124 | |
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[966] | 125 | |
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| 126 | // Compute this for weight change after continuous energy loss |
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| 127 | //------------------------------------------------------------- |
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[1196] | 128 | G4double DEDX_before = theDirectEnergyLossProcess->GetDEDX(preStepKinEnergy, currentCouple); |
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| 129 | |
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[966] | 130 | |
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[1196] | 131 | |
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[966] | 132 | // For the fluctuation we generate a new dynamic particle with energy =preEnergy+egain |
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| 133 | // and then compute the fluctuation given in the direct case. |
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| 134 | //----------------------------------------------------------------------- |
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| 135 | G4DynamicParticle* dynParticle = new G4DynamicParticle(); |
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| 136 | *dynParticle = *(track.GetDynamicParticle()); |
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[1196] | 137 | dynParticle->SetDefinition(theDirectPartDef); |
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| 138 | G4double Tkin = dynParticle->GetKineticEnergy(); |
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| 139 | G4double Tkin1=Tkin*0.001; |
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| 140 | |
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[966] | 141 | size_t n=1; |
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| 142 | if (is_integral ) n=10; |
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[1196] | 143 | n=1; |
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[966] | 144 | G4double dlength= length/n; |
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| 145 | for (size_t i=0;i<n;i++) { |
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[1196] | 146 | G4double factor_dE=1.; |
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| 147 | if (Tkin != preStepKinEnergy && IsIon) { |
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| 148 | chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,Tkin); |
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| 149 | theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio); |
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| 150 | |
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| 151 | } |
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| 152 | |
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[966] | 153 | G4double r = theDirectEnergyLossProcess->GetRange(Tkin, currentCouple); |
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| 154 | if( dlength <= linLossLimit * r ) { |
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| 155 | degain = DEDX_before*dlength; |
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[1196] | 156 | G4double degain1 = dlength*theDirectEnergyLossProcess->GetDEDX(Tkin1, currentCouple); |
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| 157 | factor_dE=1.+(degain1-degain)/(Tkin1-Tkin); |
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[966] | 158 | } |
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| 159 | else { |
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[1196] | 160 | G4double x = r + dlength; |
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| 161 | //degain = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple) - theDirectEnergyLossProcess->GetKineticEnergy(r,currentCouple); |
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| 162 | G4double E = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple); |
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| 163 | if (IsIon){ |
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| 164 | chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,E); |
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| 165 | theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio); |
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| 166 | G4double x1= theDirectEnergyLossProcess->GetRange(E, currentCouple); |
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| 167 | while (std::abs(x-x1)>0.01*x) { |
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| 168 | E = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple); |
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| 169 | chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,E); |
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| 170 | theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio); |
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| 171 | x1= theDirectEnergyLossProcess->GetRange(E, currentCouple); |
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| 172 | |
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| 173 | } |
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| 174 | } |
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| 175 | G4double r1 = theDirectEnergyLossProcess->GetRange(Tkin1, currentCouple); |
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| 176 | G4double x1 = r1 + dlength; |
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| 177 | G4double E1 = theDirectEnergyLossProcess->GetKineticEnergy(x1,currentCouple); |
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| 178 | factor_dE=(E1-E)/(Tkin1-Tkin); |
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| 179 | degain=E-Tkin; |
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| 180 | |
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| 181 | |
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| 182 | |
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[966] | 183 | } |
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[1196] | 184 | //G4cout<<degain<<G4endl; |
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[966] | 185 | G4double tmax = currentModel->MaxSecondaryKinEnergy(dynParticle); |
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| 186 | tmax = std::min(tmax,currentTcut); |
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[1196] | 187 | |
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| 188 | |
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| 189 | dynParticle->SetKineticEnergy(Tkin+degain); |
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[966] | 190 | |
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[1196] | 191 | // Corrections, which cannot be tabulated for ions |
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| 192 | //---------------------------------------- |
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| 193 | G4double esecdep=0;//not used in most models |
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| 194 | currentModel->CorrectionsAlongStep(currentCouple, dynParticle, degain,esecdep, dlength); |
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| 195 | |
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[966] | 196 | // Sample fluctuations |
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| 197 | //------------------- |
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[1196] | 198 | |
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[966] | 199 | |
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| 200 | G4double deltaE =0.; |
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| 201 | if (lossFluctuationFlag ) { |
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| 202 | deltaE = currentModel->GetModelOfFluctuations()-> |
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[1196] | 203 | SampleFluctuations(currentMaterial,dynParticle,tmax,dlength,degain)-degain; |
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[966] | 204 | } |
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[1196] | 205 | |
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| 206 | G4double egain=degain+deltaE; |
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| 207 | if (egain <=0) egain=degain; |
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| 208 | Tkin+=egain; |
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[966] | 209 | dynParticle->SetKineticEnergy(Tkin); |
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[1196] | 210 | } |
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[966] | 211 | |
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[1196] | 212 | |
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[966] | 213 | |
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| 214 | |
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| 215 | |
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| 216 | delete dynParticle; |
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| 217 | |
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[1196] | 218 | if (IsIon){ |
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| 219 | chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,Tkin); |
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| 220 | theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio); |
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| 221 | |
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| 222 | } |
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[966] | 223 | |
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| 224 | G4double DEDX_after = theDirectEnergyLossProcess->GetDEDX(Tkin, currentCouple); |
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| 225 | |
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[1196] | 226 | |
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| 227 | G4double weight_correction=DEDX_after/DEDX_before; |
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| 228 | |
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| 229 | |
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[966] | 230 | aParticleChange.ProposeEnergy(Tkin); |
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| 231 | |
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| 232 | //we still need to register in the particleChange the modification of the weight of the particle |
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| 233 | G4double new_weight=weight_correction*track.GetWeight(); |
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[1196] | 234 | aParticleChange.SetParentWeightByProcess(false); |
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[966] | 235 | aParticleChange.ProposeParentWeight(new_weight); |
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| 236 | |
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| 237 | |
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| 238 | return &aParticleChange; |
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| 239 | |
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| 240 | } |
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| 241 | /////////////////////////////////////////////////////// |
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| 242 | // |
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| 243 | void G4ContinuousGainOfEnergy::SetLossFluctuations(G4bool val) |
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| 244 | { |
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| 245 | if(val && !lossFluctuationArePossible) return; |
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| 246 | lossFluctuationFlag = val; |
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| 247 | } |
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[1196] | 248 | /////////////////////////////////////////////////////// |
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| 249 | // |
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| 250 | |
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| 251 | |
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| 252 | |
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| 253 | G4double G4ContinuousGainOfEnergy::GetContinuousStepLimit(const G4Track& track, |
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| 254 | G4double , G4double , G4double& ) |
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| 255 | { |
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| 256 | G4double x = DBL_MAX; |
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| 257 | x=.1*mm; |
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| 258 | |
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| 259 | |
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| 260 | DefineMaterial(track.GetMaterialCutsCouple()); |
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| 261 | |
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| 262 | preStepKinEnergy = track.GetKineticEnergy(); |
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| 263 | preStepScaledKinEnergy = track.GetKineticEnergy()*massRatio; |
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| 264 | currentModel = theDirectEnergyLossProcess->SelectModelForMaterial(preStepScaledKinEnergy,currentCoupleIndex); |
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| 265 | G4double emax_model=currentModel->HighEnergyLimit(); |
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| 266 | if (IsIon) { |
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| 267 | chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,preStepKinEnergy); |
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| 268 | preStepChargeSqRatio = chargeSqRatio; |
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| 269 | theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,preStepChargeSqRatio); |
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| 270 | } |
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| 271 | |
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| 272 | |
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| 273 | G4double maxE =1.1*preStepKinEnergy; |
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| 274 | /*if (preStepKinEnergy< 0.05*MeV) maxE =2.*preStepKinEnergy; |
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| 275 | else if (preStepKinEnergy< 0.1*MeV) maxE =1.5*preStepKinEnergy; |
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| 276 | else if (preStepKinEnergy< 0.5*MeV) maxE =1.25*preStepKinEnergy;*/ |
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| 277 | |
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| 278 | if (preStepKinEnergy < currentTcut) maxE = std::min(currentTcut,maxE); |
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| 279 | |
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| 280 | maxE=std::min(emax_model*1.001,maxE); |
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| 281 | |
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| 282 | G4double r = theDirectEnergyLossProcess->GetRange(preStepKinEnergy, currentCouple); |
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| 283 | |
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| 284 | if (IsIon) { |
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| 285 | G4double chargeSqRatioAtEmax = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,maxE); |
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| 286 | theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatioAtEmax); |
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| 287 | } |
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| 288 | |
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| 289 | G4double r1 = theDirectEnergyLossProcess->GetRange(maxE, currentCouple); |
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| 290 | |
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| 291 | if (IsIon) theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,preStepChargeSqRatio); |
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| 292 | |
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| 293 | |
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| 294 | |
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| 295 | x=r1-r; |
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| 296 | x=std::max(r1-r,0.001*mm); |
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| 297 | |
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| 298 | return x; |
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| 299 | |
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| 300 | |
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| 301 | } |
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| 302 | #include "G4EmCorrections.hh" |
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| 303 | /////////////////////////////////////////////////////// |
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| 304 | // |
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| 305 | |
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| 306 | void G4ContinuousGainOfEnergy::SetDynamicMassCharge(const G4Track& ,G4double energy) |
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| 307 | { |
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| 308 | |
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| 309 | G4double ChargeSqRatio= G4LossTableManager::Instance()->EmCorrections()->EffectiveChargeSquareRatio(theDirectPartDef,currentMaterial,energy); |
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| 310 | if (theDirectEnergyLossProcess) theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,ChargeSqRatio); |
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| 311 | } |
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