physics/include/G4eLowEnergyLoss.icc

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0025 //
0026 //
0027 //
0028 // ---------------------------------------------------------------
0029 //      GEANT 4 class inlined methods file
0030 //
0031 //      History: based on object model of
0032 //      2nd December 1995, G.Cosmo
0033 //      ------------ G4eLowEnergyLoss physics process ------------
0034 //                  by Laszlo Urban, 20 March 1997
0035 // ***************************************************************
0036 // It is the first implementation of the NEW UNIFIED ENERGY LOSS PROCESS.
0037 // It calculates the energy loss of e+/e-.
0038 // -------------------------------------------------------------
0039 //
0040 // 08-09-98  cleanup
0041 // 28-03-02  V.Ivanchenko add fluorescence flag
0042 // 21-01-03  V.Ivanchenko cut per region
0043 // 18-04-03  V.Ivanchenko finalRange redefinition
0044 //
0045 // ---------------------------------------------------------------
0046
0047 inline G4double G4eLowEnergyLoss::GetConstraints(
0048                                       const G4DynamicParticle* aParticle,
0049                                       const G4MaterialCutsCouple* couple)
0050 {
0051   G4double StepLimit;
0052   // returns the Step limit
0053   // dRoverRange is the max. allowed relative range loss in one Step
0054   // it calculates dEdx and the range as well....
0055
0056   const G4ParticleDefinition* ParticleType=aParticle->GetDefinition();
0057
0058   Charge = aParticle->GetDefinition()->GetPDGCharge();
0059   if(Charge != lastCharge) lastCharge = Charge ;
0060
0061   G4double KineticEnergy = aParticle->GetKineticEnergy();
0062
0063   fdEdx = G4EnergyLossTables::GetDEDX(ParticleType,KineticEnergy,couple);
0064   fRangeNow =
0065            G4EnergyLossTables::GetRange(ParticleType,KineticEnergy,couple);
0066
0067   G4double r = std::min(finalRange, couple->GetProductionCuts()
0068                  ->GetProductionCut(idxG4ElectronCut));
0069
0070   if (fRangeNow > r) {
0071     StepLimit = dRoverRange*fRangeNow + r*(1.0 - dRoverRange)*(2.0 - r/fRangeNow);
0072     //randomise this value
0073     if (rndmStepFlag) StepLimit = finalRange + (StepLimit-finalRange)*G4UniformRand();
0074     if (StepLimit > fRangeNow) StepLimit = fRangeNow;
0075   }
0076   else StepLimit = fRangeNow;
0077
0078   return StepLimit;
0079 }
0080
0081 //
0082
0083 inline G4double G4eLowEnergyLoss::GetContinuousStepLimit(
0084                                                const G4Track& track,
0085                                                G4double,
0086                                                G4double currentMinimumStep,
0087                                                G4double&)
0088 {
0089
0090   G4double Step =
0091     GetConstraints(track.GetDynamicParticle(),track.GetMaterialCutsCouple());
0092
0093   if ((Step>0.0)&&(Step<currentMinimumStep)) currentMinimumStep = Step;
0094
0095   return Step ;
0096 }
0097
0098 //
0099 inline G4bool G4eLowEnergyLoss::IsApplicable(const G4ParticleDefinition&
0100                                                      particle)
0101 {
0102   return(   (&particle == G4Electron::Electron())
0103            ||(&particle == G4Positron::Positron()) );
0104 }
0105
0106 inline void G4eLowEnergyLoss::ActivateFluorescence(G4bool val)
0107 {
0108   theFluo = val;
0109 }
0110
0111 inline G4bool G4eLowEnergyLoss::Fluorescence() const
0112 {
0113   return theFluo;
0114 }
0115
0116 //
0117