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27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4ePairProduction
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 17.03.2016
37 //
38 // Modifications:
39 //
40 // -------------------------------------------------------------------
41 //
42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
44
45 #include "G4ePairProduction.hh"
46 #include "G4SystemOfUnits.hh"
47 #include "G4Electron.hh"
48 #include "G4Positron.hh"
49 #include "G4VEmModel.hh"
50 #include "G4VEmFluctuationModel.hh"
51 #include "G4MuPairProductionModel.hh"
52 #include "G4ElementData.hh"
53 #include "G4EmParameters.hh"
54
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
56
57 G4ePairProduction::G4ePairProduction(const G4String& name)
58 : G4VEnergyLossProcess(name),
59 lowestKinEnergy(100.*CLHEP::MeV)
60 {
61 SetProcessSubType(fPairProdByCharged);
62 SetSecondaryParticle(G4Positron::Positron());
63 SetIonisation(false);
64 SetSpline(false);
65 }
66
67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
68
69 G4bool G4ePairProduction::IsApplicable(const G4ParticleDefinition& p)
70 {
71 return (G4Electron::Electron() == &p || G4Positron::Positron() == &p);
72 }
73
74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75
76 G4double G4ePairProduction::MinPrimaryEnergy(const G4ParticleDefinition*,
77 const G4Material*,
78 G4double)
79 {
80 return lowestKinEnergy;
81 }
82
83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
84
85 void G4ePairProduction::InitialiseEnergyLossProcess(
86 const G4ParticleDefinition* part,
87 const G4ParticleDefinition*)
88 {
89 if (!isInitialised) {
90 isInitialised = true;
91
92 theParticle = part;
93
94 G4MuPairProductionModel* mod = new G4MuPairProductionModel(part, "ePairProd");
95 SetEmModel(mod);
96
97 lowestKinEnergy = std::max(lowestKinEnergy, part->GetPDGMass()*8.0);
98 mod->SetLowestKineticEnergy(lowestKinEnergy);
99
100 G4VEmFluctuationModel* fm = nullptr;
101 G4EmParameters* param = G4EmParameters::Instance();
102 mod->SetLowEnergyLimit(param->MinKinEnergy());
103 mod->SetHighEnergyLimit(param->MaxKinEnergy());
104 AddEmModel(1, mod, fm);
105 }
106 }
107
108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
109
110 void G4ePairProduction::StreamProcessInfo(std::ostream& out) const
111 {
112 G4ElementData* ed = EmModel(0)->GetElementData();
113 if(ed) {
114 for(G4int Z=1; Z<93; ++Z) {
115 G4Physics2DVector* pv = ed->GetElement2DData(Z);
116 if(pv) {
117 out << " Sampling table " << pv->GetLengthY()
118 << "x" << pv->GetLengthX() << "; from "
119 << G4Exp(pv->GetY(0))/GeV << " GeV to "
120 << G4Exp(pv->GetY(pv->GetLengthY()-1))/TeV
121 << " TeV " << G4endl;
122 break;
123 }
124 }
125 }
126 }
127
128 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
129
130 void G4ePairProduction::ProcessDescription(std::ostream& out) const
131 {
132 out << " Electron-positron pair production by electron or positron";
133 G4VEnergyLossProcess::ProcessDescription(out);
134 }
135
136 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
137