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1 //
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25 //
26 //
27 //
28 // ---------------------------------------------------------------
29 // GEANT 4 class inlined methods file
30 //
31 // History: based on object model of
32 // 2nd December 1995, G.Cosmo
33 // ------------ G4eLowEnergyLoss physics process ------------
34 // by Laszlo Urban, 20 March 1997
35 // ***************************************************************
36 // It is the first implementation of the NEW UNIFIED ENERGY LOSS PROCESS.
37 // It calculates the energy loss of e+/e-.
38 // -------------------------------------------------------------
39 //
40 // 08-09-98 cleanup
41 // 28-03-02 V.Ivanchenko add fluorescence flag
42 // 21-01-03 V.Ivanchenko cut per region
43 // 18-04-03 V.Ivanchenko finalRange redefinition
44 //
45 // ---------------------------------------------------------------
46
47 inline G4double G4eLowEnergyLoss::GetConstraints(
48 const G4DynamicParticle* aParticle,
49 const G4MaterialCutsCouple* couple)
50 {
51 G4double StepLimit;
52 // returns the Step limit
53 // dRoverRange is the max. allowed relative range loss in one Step
54 // it calculates dEdx and the range as well....
55
56 const G4ParticleDefinition* ParticleType=aParticle->GetDefinition();
57
58 Charge = aParticle->GetDefinition()->GetPDGCharge();
59 if(Charge != lastCharge) lastCharge = Charge ;
60
61 G4double KineticEnergy = aParticle->GetKineticEnergy();
62
63 fdEdx = G4EnergyLossTables::GetDEDX(ParticleType,KineticEnergy,couple);
64 fRangeNow =
65 G4EnergyLossTables::GetRange(ParticleType,KineticEnergy,couple);
66
67 G4double r = std::min(finalRange, couple->GetProductionCuts()
68 ->GetProductionCut(idxG4ElectronCut));
69
70 if (fRangeNow > r) {
71 StepLimit = dRoverRange*fRangeNow + r*(1.0 - dRoverRange)*(2.0 - r/fRangeNow);
72 //randomise this value
73 if (rndmStepFlag) StepLimit = finalRange + (StepLimit-finalRange)*G4UniformRand();
74 if (StepLimit > fRangeNow) StepLimit = fRangeNow;
75 }
76 else StepLimit = fRangeNow;
77
78 return StepLimit;
79 }
80
81 //
82
83 inline G4double G4eLowEnergyLoss::GetContinuousStepLimit(
84 const G4Track& track,
85 G4double,
86 G4double currentMinimumStep,
87 G4double&)
88 {
89
90 G4double Step =
91 GetConstraints(track.GetDynamicParticle(),track.GetMaterialCutsCouple());
92
93 if ((Step>0.0)&&(Step<currentMinimumStep)) currentMinimumStep = Step;
94
95 return Step ;
96 }
97
98 //
99 inline G4bool G4eLowEnergyLoss::IsApplicable(const G4ParticleDefinition&
100 particle)
101 {
102 return( (&particle == G4Electron::Electron())
103 ||(&particle == G4Positron::Positron()) );
104 }
105
106 inline void G4eLowEnergyLoss::ActivateFluorescence(G4bool val)
107 {
108 theFluo = val;
109 }
110
111 inline G4bool G4eLowEnergyLoss::Fluorescence() const
112 {
113 return theFluo;
114 }
115
116 //
117
118