[966] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | #include "G4ContinuousGainOfEnergy.hh" |
---|
| 27 | #include "G4Step.hh" |
---|
| 28 | #include "G4ParticleDefinition.hh" |
---|
| 29 | #include "G4VEmModel.hh" |
---|
| 30 | #include "G4VEmFluctuationModel.hh" |
---|
| 31 | #include "G4VParticleChange.hh" |
---|
| 32 | #include "G4UnitsTable.hh" |
---|
| 33 | |
---|
| 34 | |
---|
| 35 | /////////////////////////////////////////////////////// |
---|
| 36 | // |
---|
| 37 | G4ContinuousGainOfEnergy::G4ContinuousGainOfEnergy(const G4String& name, |
---|
| 38 | G4ProcessType type): G4VContinuousProcess(name, type) |
---|
| 39 | { |
---|
| 40 | |
---|
| 41 | linLossLimit=0.05; |
---|
| 42 | lossFluctuationArePossible =true; |
---|
| 43 | lossFluctuationFlag=true; |
---|
| 44 | is_integral = false; |
---|
| 45 | |
---|
| 46 | } |
---|
| 47 | |
---|
| 48 | /////////////////////////////////////////////////////// |
---|
| 49 | // |
---|
| 50 | G4ContinuousGainOfEnergy::~G4ContinuousGainOfEnergy() |
---|
| 51 | { |
---|
| 52 | |
---|
| 53 | } |
---|
| 54 | /////////////////////////////////////////////////////// |
---|
| 55 | // |
---|
| 56 | |
---|
| 57 | void G4ContinuousGainOfEnergy::PreparePhysicsTable( |
---|
| 58 | const G4ParticleDefinition& ) |
---|
| 59 | {//theDirectEnergyLossProcess->PreparePhysicsTable(part); |
---|
| 60 | |
---|
| 61 | ; |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | /////////////////////////////////////////////////////// |
---|
| 65 | // |
---|
| 66 | |
---|
| 67 | void G4ContinuousGainOfEnergy::BuildPhysicsTable(const G4ParticleDefinition&) |
---|
| 68 | {//theDirectEnergyLossProcess->BuildPhysicsTable(part); |
---|
| 69 | ; |
---|
| 70 | } |
---|
| 71 | |
---|
| 72 | |
---|
| 73 | |
---|
| 74 | |
---|
| 75 | /////////////////////////////////////////////////////// |
---|
| 76 | // |
---|
| 77 | // |
---|
| 78 | G4VParticleChange* G4ContinuousGainOfEnergy::AlongStepDoIt(const G4Track& track, |
---|
| 79 | const G4Step& step) |
---|
| 80 | { |
---|
| 81 | |
---|
| 82 | aParticleChange.Initialize(track); |
---|
| 83 | |
---|
| 84 | // Get the actual (true) Step length |
---|
| 85 | //---------------------------------- |
---|
| 86 | G4double length = step.GetStepLength(); |
---|
| 87 | G4double degain = 0.0; |
---|
| 88 | |
---|
| 89 | |
---|
| 90 | |
---|
| 91 | |
---|
| 92 | // Compute this for weight change after continuous energy loss |
---|
| 93 | //------------------------------------------------------------- |
---|
| 94 | G4double DEDX_before = |
---|
| 95 | theDirectEnergyLossProcess |
---|
| 96 | ->GetDEDX(preStepKinEnergy, currentCouple); |
---|
| 97 | |
---|
| 98 | |
---|
| 99 | |
---|
| 100 | // For the fluctuation we generate a new dynamic particle with energy =preEnergy+egain |
---|
| 101 | // and then compute the fluctuation given in the direct case. |
---|
| 102 | //----------------------------------------------------------------------- |
---|
| 103 | G4DynamicParticle* dynParticle = new G4DynamicParticle(); |
---|
| 104 | *dynParticle = *(track.GetDynamicParticle()); |
---|
| 105 | G4double Tkin = dynParticle->GetKineticEnergy(); |
---|
| 106 | |
---|
| 107 | size_t n=1; |
---|
| 108 | if (is_integral ) n=10; |
---|
| 109 | G4double dlength= length/n; |
---|
| 110 | for (size_t i=0;i<n;i++) { |
---|
| 111 | G4double r = theDirectEnergyLossProcess->GetRange(Tkin, currentCouple); |
---|
| 112 | if( dlength <= linLossLimit * r ) { |
---|
| 113 | degain = DEDX_before*dlength; |
---|
| 114 | } |
---|
| 115 | else { |
---|
| 116 | G4double x = r + length; |
---|
| 117 | degain = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple) - theDirectEnergyLossProcess->GetKineticEnergy(r,currentCouple); |
---|
| 118 | } |
---|
| 119 | G4VEmModel* currentModel = theDirectEnergyLossProcess->SelectModelForMaterial(Tkin+degain,currentMaterialIndex); |
---|
| 120 | G4double tmax = currentModel->MaxSecondaryKinEnergy(dynParticle); |
---|
| 121 | tmax = std::min(tmax,currentTcut); |
---|
| 122 | |
---|
| 123 | |
---|
| 124 | |
---|
| 125 | // Sample fluctuations |
---|
| 126 | //------------------- |
---|
| 127 | |
---|
| 128 | G4double deltaE =0.; |
---|
| 129 | if (lossFluctuationFlag ) { |
---|
| 130 | deltaE = currentModel->GetModelOfFluctuations()-> |
---|
| 131 | SampleFluctuations(currentMaterial,dynParticle,tmax,length,degain)-degain; |
---|
| 132 | } |
---|
| 133 | Tkin+=degain+deltaE; |
---|
| 134 | dynParticle->SetKineticEnergy(Tkin); |
---|
| 135 | |
---|
| 136 | } |
---|
| 137 | |
---|
| 138 | |
---|
| 139 | |
---|
| 140 | // Corrections, which cannot be tabulated |
---|
| 141 | // probably this should be also changed |
---|
| 142 | // at this time it does nothing so we can leave it |
---|
| 143 | //CorrectionsAlongStep(currentCouple, dynParticle, egain, length); |
---|
| 144 | |
---|
| 145 | delete dynParticle; |
---|
| 146 | |
---|
| 147 | |
---|
| 148 | G4double DEDX_after = theDirectEnergyLossProcess->GetDEDX(Tkin, currentCouple); |
---|
| 149 | G4double weight_correction=DEDX_after/DEDX_before; //probably not needed |
---|
| 150 | weight_correction=1.; |
---|
| 151 | |
---|
| 152 | aParticleChange.ProposeEnergy(Tkin); |
---|
| 153 | |
---|
| 154 | //we still need to register in the particleChange the modification of the weight of the particle |
---|
| 155 | G4double new_weight=weight_correction*track.GetWeight(); |
---|
| 156 | aParticleChange.SetParentWeightByProcess(true); |
---|
| 157 | aParticleChange.ProposeParentWeight(new_weight); |
---|
| 158 | |
---|
| 159 | |
---|
| 160 | return &aParticleChange; |
---|
| 161 | |
---|
| 162 | } |
---|
| 163 | /////////////////////////////////////////////////////// |
---|
| 164 | // |
---|
| 165 | void G4ContinuousGainOfEnergy::SetLossFluctuations(G4bool val) |
---|
| 166 | { |
---|
| 167 | if(val && !lossFluctuationArePossible) return; |
---|
| 168 | lossFluctuationFlag = val; |
---|
| 169 | } |
---|