| 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: G4eLowEnergyLoss.icc,v 1.8 2006/06/29 19:37:44 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-beta-cand-01 $ |
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| 29 | // |
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| 30 | // --------------------------------------------------------------- |
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| 31 | // GEANT 4 class inlined methods file |
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| 32 | // |
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| 33 | // History: based on object model of |
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| 34 | // 2nd December 1995, G.Cosmo |
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| 35 | // ------------ G4eLowEnergyLoss physics process ------------ |
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| 36 | // by Laszlo Urban, 20 March 1997 |
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| 37 | // *************************************************************** |
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| 38 | // It is the first implementation of the NEW UNIFIED ENERGY LOSS PROCESS. |
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| 39 | // It calculates the energy loss of e+/e-. |
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| 40 | // ------------------------------------------------------------- |
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| 41 | // |
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| 42 | // 08-09-98 cleanup |
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| 43 | // 28-03-02 V.Ivanchenko add fluorescence flag |
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| 44 | // 21-01-03 V.Ivanchenko cut per region |
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| 45 | // 18-04-03 V.Ivanchenko finalRange redefinition |
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| 46 | // |
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| 47 | // --------------------------------------------------------------- |
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| 48 | |
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| 49 | inline G4double G4eLowEnergyLoss::GetConstraints( |
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| 50 | const G4DynamicParticle* aParticle, |
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| 51 | const G4MaterialCutsCouple* couple) |
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| 52 | { |
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| 53 | G4double StepLimit; |
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| 54 | // returns the Step limit |
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| 55 | // dRoverRange is the max. allowed relative range loss in one Step |
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| 56 | // it calculates dEdx and the range as well.... |
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| 57 | |
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| 58 | const G4ParticleDefinition* ParticleType=aParticle->GetDefinition(); |
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| 59 | |
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| 60 | Charge = aParticle->GetDefinition()->GetPDGCharge(); |
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| 61 | if(Charge != lastCharge) lastCharge = Charge ; |
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| 62 | |
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| 63 | G4double KineticEnergy = aParticle->GetKineticEnergy(); |
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| 64 | |
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| 65 | fdEdx = G4EnergyLossTables::GetDEDX(ParticleType,KineticEnergy,couple); |
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| 66 | fRangeNow = |
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| 67 | G4EnergyLossTables::GetRange(ParticleType,KineticEnergy,couple); |
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| 68 | |
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| 69 | G4double r = std::min(finalRange, couple->GetProductionCuts() |
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| 70 | ->GetProductionCut(idxG4ElectronCut)); |
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| 71 | |
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| 72 | if (fRangeNow > r) { |
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| 73 | StepLimit = dRoverRange*fRangeNow + r*(1.0 - dRoverRange)*(2.0 - r/fRangeNow); |
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| 74 | //randomise this value |
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| 75 | if (rndmStepFlag) StepLimit = finalRange + (StepLimit-finalRange)*G4UniformRand(); |
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| 76 | if (StepLimit > fRangeNow) StepLimit = fRangeNow; |
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| 77 | } |
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| 78 | else StepLimit = fRangeNow; |
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| 79 | |
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| 80 | return StepLimit; |
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| 81 | } |
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| 82 | |
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| 83 | // |
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| 84 | |
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| 85 | inline G4double G4eLowEnergyLoss::GetContinuousStepLimit( |
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| 86 | const G4Track& track, |
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| 87 | G4double, |
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| 88 | G4double currentMinimumStep, |
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| 89 | G4double&) |
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| 90 | { |
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| 91 | |
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| 92 | G4double Step = |
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| 93 | GetConstraints(track.GetDynamicParticle(),track.GetMaterialCutsCouple()); |
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| 94 | |
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| 95 | if ((Step>0.0)&&(Step<currentMinimumStep)) currentMinimumStep = Step; |
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| 96 | |
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| 97 | return Step ; |
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| 98 | } |
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| 99 | |
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| 100 | // |
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| 101 | inline G4bool G4eLowEnergyLoss::IsApplicable(const G4ParticleDefinition& |
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| 102 | particle) |
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| 103 | { |
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| 104 | return( (&particle == G4Electron::Electron()) |
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| 105 | ||(&particle == G4Positron::Positron()) ); |
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| 106 | } |
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| 107 | |
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| 108 | inline void G4eLowEnergyLoss::ActivateFluorescence(G4bool val) |
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| 109 | { |
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| 110 | theFluo = val; |
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| 111 | } |
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| 112 | |
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| 113 | inline G4bool G4eLowEnergyLoss::Fluorescence() const |
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| 114 | { |
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| 115 | return theFluo; |
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| 116 | } |
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| 117 | |
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| 118 | // |
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| 119 | |
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