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25 //
26 // -------------------------------------------------------------------
27 //
28 // GEANT4 Class file
29 //
30 //
31 // File name: G4MuIonisation
32 //
33 // Author: Laszlo Urban
34 //
35 // Creation date: 30.09.1997
36 //
37 // Modifications:
38 //
39 // 08-04-98 remove 'tracking cut' of the ionizing particle (mma)
40 // 26-10-98 new stuff from R.Kokoulin + cleanup , L.Urban
41 // 10-02-00 modifications , new e.m. structure, L.Urban
42 // 23-03-01 R.Kokoulin's correction is commented out, L.Urban
43 // 29-05-01 V.Ivanchenko minor changes to provide ANSI -wall compilation
44 // 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
45 // 28-08-01 new function ComputeRestrictedMeandEdx() + 'cleanup' (mma)
46 // 17-09-01 migration of Materials to pure STL (mma)
47 // 26-09-01 completion of RetrievePhysicsTable (mma)
48 // 29-10-01 all static functions no more inlined (mma)
49 // 07-11-01 correction(Tmax+xsection computation) L.Urban
50 // 08-11-01 particleMass becomes a local variable (mma)
51 // 10-05-02 V.Ivanchenko update to new design
52 // 04-12-02 V.Ivanchenko the low energy limit for Kokoulin model to 10 GeV
53 // 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
54 // 26-12-02 Secondary production moved to derived classes (V.Ivanchenko)
55 // 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
56 // 23-05-03 Define default integral + BohrFluctuations (V.Ivanchenko)
57 // 03-06-03 Add SetIntegral method to choose fluctuation model (V.Ivanchenko)
58 // 03-06-03 Fix initialisation problem for STD ionisation (V.Ivanchenko)
59 // 04-08-03 Set integral=false to be default (V.Ivanchenko)
60 // 08-08-03 STD substitute standard (V.Ivanchenko)
61 // 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
62 // 10-02-04 Calculation of radiative corrections using R.Kokoulin model (V.I.)
63 // 27-05-04 Set integral to be a default regime (V.Ivanchenko)
64 // 17-08-04 Utilise mu+ tables for mu- (V.Ivanchenko)
65 // 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
66 // 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
67 // 12-08-05 SetStepLimits(0.2, 0.1*mm) (mma)
68 // 02-09-05 SetStepLimits(0.2, 1*mm) (V.Ivantchenko)
69 // 12-08-05 SetStepLimits(0.2, 0.1*mm) + integral off (V.Ivantchenko)
70 // 10-01-06 SetStepLimits -> SetStepFunction (V.Ivantchenko)
71 //
72 // -------------------------------------------------------------------
73 //
74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
76
77 #include "G4MuIonisation.hh"
78 #include "G4PhysicalConstants.hh"
79 #include "G4SystemOfUnits.hh"
80 #include "G4Electron.hh"
81 #include "G4BraggModel.hh"
82 #include "G4BetheBlochModel.hh"
83 #include "G4MuBetheBlochModel.hh"
84 #include "G4EmStandUtil.hh"
85 #include "G4ICRU73QOModel.hh"
86 #include "G4EmParameters.hh"
87
88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
89
90 G4MuIonisation::G4MuIonisation(const G4String& name)
91 : G4VEnergyLossProcess(name)
92 {
93 SetProcessSubType(fIonisation);
94 SetSecondaryParticle(G4Electron::Electron());
95 }
96
97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
98
99 G4bool G4MuIonisation::IsApplicable(const G4ParticleDefinition& p)
100 {
101 return (p.GetPDGCharge() != 0.0);
102 }
103
104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
105
106 G4double G4MuIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
107 const G4Material*,
108 G4double cut)
109 {
110 G4double x = 0.5*cut/CLHEP::electron_mass_c2;
111 G4double gam = x*ratio + std::sqrt((1. + x)*(1. + x*ratio*ratio));
112 return mass*(gam - 1.0);
113 }
114
115 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
116
117 void
118 G4MuIonisation::InitialiseEnergyLossProcess(const G4ParticleDefinition* part,
119 const G4ParticleDefinition* bpart)
120 {
121 if(!isInitialised) {
122
123 theParticle = part;
124 theBaseParticle = bpart;
125
126 mass = theParticle->GetPDGMass();
127 ratio = CLHEP::electron_mass_c2/mass;
128 G4double q = theParticle->GetPDGCharge();
129
130 G4EmParameters* param = G4EmParameters::Instance();
131 G4double elow = 0.2*CLHEP::MeV;
132 G4double emax = param->MaxKinEnergy();
133
134 // Bragg peak model
135 if (nullptr == EmModel(0)) {
136 if(q > 0.0) { SetEmModel(new G4BraggModel()); }
137 else { SetEmModel(new G4ICRU73QOModel()); }
138 }
139 EmModel(0)->SetLowEnergyLimit(param->MinKinEnergy());
140 EmModel(0)->SetHighEnergyLimit(elow);
141
142 // fluctuation model
143 if (nullptr == FluctModel()) {
144 SetFluctModel(G4EmStandUtil::ModelOfFluctuations());
145 }
146 AddEmModel(1, EmModel(0), FluctModel());
147
148 // high energy model
149 if (nullptr == EmModel(1)) { SetEmModel(new G4MuBetheBlochModel()); }
150 EmModel(1)->SetLowEnergyLimit(elow);
151 EmModel(1)->SetHighEnergyLimit(emax);
152 AddEmModel(1, EmModel(1), FluctModel());
153
154 isInitialised = true;
155 }
156 }
157
158 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
159
160 void G4MuIonisation::ProcessDescription(std::ostream& out) const
161 {
162 out << " Muon ionisation";
163 G4VEnergyLossProcess::ProcessDescription(out);
164 }
165
166 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
167