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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4MuPairProduction
33 //
34 // Author: Laszlo Urban
35 //
36 // Creation date: 30.05.1998
37 //
38 // Modifications:
39 //
40 // 04-06-98 in DoIt,secondary production condition:
41 // range>std::min(threshold,safety)
42 // 26-10-98 new stuff from R. Kokoulin + cleanup , L.Urban
43 // 06-05-99 bug fixed , L.Urban
44 // 10-02-00 modifications+bug fix , new e.m. structure, L.Urban
45 // 29-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
46 // 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
47 // 17-09-01 migration of Materials to pure STL (mma)
48 // 20-09-01 (L.Urban) in ComputeMicroscopicCrossSection, remove:
49 // if(MaxPairEnergy<CutInPairEnergy) MaxPairEnergy=CutInPairEnergy
50 // 26-09-01 completion of store/retrieve PhysicsTable
51 // 28-09-01 suppression of theMuonPlus ..etc..data members (mma)
52 // 29-10-01 all static functions no more inlined (mma)
53 // 07-11-01 particleMass becomes a local variable (mma)
54 // 19-08-02 V.Ivanchenko update to new design
55 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
56 // 26-12-02 Secondary production moved to derived classes (V.Ivanchenko)
57 // 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
58 // 08-08-03 STD substitute standard (V.Ivanchenko)
59 // 27-09-03 e+ set to be a secondary particle (V.Ivanchenko)
60 // 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
61 // 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
62 // 17-08-04 Utilise mu+ tables for mu- (V.Ivanchenko)
63 // 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
64 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
65 //
66 // -------------------------------------------------------------------
67 //
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
70
71 #include "G4MuPairProduction.hh"
72 #include "G4SystemOfUnits.hh"
73 #include "G4Positron.hh"
74 #include "G4VEmModel.hh"
75 #include "G4MuPairProductionModel.hh"
76 #include "G4ElementData.hh"
77 #include "G4EmParameters.hh"
78
79 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
80
81 G4MuPairProduction::G4MuPairProduction(const G4String& name)
82 : G4VEnergyLossProcess(name),
83 lowestKinEnergy(0.85*CLHEP::GeV)
84 {
85 SetProcessSubType(fPairProdByCharged);
86 SetSecondaryParticle(G4Positron::Positron());
87 SetIonisation(false);
88 }
89
90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
91
92 G4bool G4MuPairProduction::IsApplicable(const G4ParticleDefinition& p)
93 {
94 return (p.GetPDGCharge() != 0.0);
95 }
96
97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
98
99 G4double G4MuPairProduction::MinPrimaryEnergy(const G4ParticleDefinition*,
100 const G4Material*,
101 G4double)
102 {
103 return lowestKinEnergy;
104 }
105
106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
107
108 void G4MuPairProduction::InitialiseEnergyLossProcess(
109 const G4ParticleDefinition* part,
110 const G4ParticleDefinition*)
111 {
112 if (isInitialised) { return; }
113 isInitialised = true;
114
115 theParticle = part;
116
117 G4VEmModel* mod = EmModel(0);
118 if(nullptr == mod) {
119 lowestKinEnergy = std::max(lowestKinEnergy, part->GetPDGMass()*8.0);
120 auto ptr = new G4MuPairProductionModel(part);
121 ptr->SetLowestKineticEnergy(lowestKinEnergy);
122 mod = ptr;
123 SetEmModel(mod);
124 }
125
126 G4VEmFluctuationModel* fm = nullptr;
127 G4EmParameters* param = G4EmParameters::Instance();
128 mod->SetLowEnergyLimit(param->MinKinEnergy());
129 mod->SetHighEnergyLimit(param->MaxKinEnergy());
130 mod->SetSecondaryThreshold(param->MuHadBremsstrahlungTh());
131 AddEmModel(1, mod, fm);
132 }
133
134 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
135
136 void G4MuPairProduction::StreamProcessInfo(std::ostream& out) const
137 {
138 G4ElementData* ed = EmModel()->GetElementData();
139 if(ed) {
140 for(G4int Z=1; Z<93; ++Z) {
141 G4Physics2DVector* pv = ed->GetElement2DData(Z);
142 if(pv) {
143 out << " Sampling table " << pv->GetLengthY()
144 << "x" << pv->GetLengthX() << "; from "
145 << std::exp(pv->GetY(0))/GeV << " GeV to "
146 << std::exp(pv->GetY(pv->GetLengthY()-1))/TeV
147 << " TeV " << G4endl;
148 break;
149 }
150 }
151 }
152 }
153
154 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
155
156 void G4MuPairProduction::ProcessDescription(std::ostream& out) const
157 {
158 out << " Electron-positron pair production by muons";
159 G4VEnergyLossProcess::ProcessDescription(out);
160 }
161
162 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
163