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26 // -------------------------------------------------------------------
27 //
28 // GEANT4 Class file
29 //
30 //
31 // File name: G4hIonisation
32 //
33 // Author: Laszlo Urban
34 //
35 // Creation date: 30.05.1997
36 //
37 // Modified by Laszlo Urban, Michel Maire and Vladimir Ivanchenko
38 //
39 // -------------------------------------------------------------------
40 //
41 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
43
44 #include "G4hIonisation.hh"
45 #include "G4PhysicalConstants.hh"
46 #include "G4SystemOfUnits.hh"
47 #include "G4Electron.hh"
48 #include "G4Proton.hh"
49 #include "G4AntiProton.hh"
50 #include "G4BraggModel.hh"
51 #include "G4BetheBlochModel.hh"
52 #include "G4EmStandUtil.hh"
53 #include "G4PionPlus.hh"
54 #include "G4PionMinus.hh"
55 #include "G4KaonPlus.hh"
56 #include "G4KaonMinus.hh"
57 #include "G4ICRU73QOModel.hh"
58 #include "G4EmParameters.hh"
59
60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
61
62 G4hIonisation::G4hIonisation(const G4String& name)
63 : G4VEnergyLossProcess(name)
64 {
65 SetProcessSubType(fIonisation);
66 SetSecondaryParticle(G4Electron::Electron());
67 eth = 2*CLHEP::MeV;
68 }
69
70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
71
72 G4bool G4hIonisation::IsApplicable(const G4ParticleDefinition&)
73 {
74 return true;
75 }
76
77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
78
79 G4double G4hIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
80 const G4Material*,
81 G4double cut)
82 {
83 G4double x = 0.5*cut/electron_mass_c2;
84 G4double gam = x*ratio + std::sqrt((1. + x)*(1. + x*ratio*ratio));
85 return mass*(gam - 1.0);
86 }
87
88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
89
90 void G4hIonisation::InitialiseEnergyLossProcess(
91 const G4ParticleDefinition* part,
92 const G4ParticleDefinition* bpart)
93 {
94 if(!isInitialised) {
95
96 const G4ParticleDefinition* theBaseParticle = nullptr;
97 G4String pname = part->GetParticleName();
98 G4double q = part->GetPDGCharge();
99
100 //G4cout << " G4hIonisation::InitialiseEnergyLossProcess " << pname
101 // << " " << bpart << G4endl;
102
103 // define base particle
104 if(part == bpart) {
105 theBaseParticle = nullptr;
106 } else if(nullptr != bpart) {
107 theBaseParticle = bpart;
108
109 } else if(pname == "proton" || pname == "anti_proton" ||
110 pname == "pi+" || pname == "pi-" ||
111 pname == "kaon+" || pname == "kaon-" ||
112 pname == "GenericIon" || pname == "alpha") {
113 // no base particles
114 theBaseParticle = nullptr;
115
116 } else {
117 // select base particle
118 if(part->GetPDGSpin() == 0.0) {
119 if(q > 0.0) { theBaseParticle = G4KaonPlus::KaonPlus(); }
120 else { theBaseParticle = G4KaonMinus::KaonMinus(); }
121 } else {
122 if(q > 0.0) { theBaseParticle = G4Proton::Proton(); }
123 else { theBaseParticle = G4AntiProton::AntiProton(); }
124 }
125 }
126 SetBaseParticle(theBaseParticle);
127
128 // model limit defined for protons
129 mass = part->GetPDGMass();
130 ratio = electron_mass_c2/mass;
131 eth = 2.0*MeV*mass/proton_mass_c2;
132
133 G4EmParameters* param = G4EmParameters::Instance();
134 G4double emin = param->MinKinEnergy();
135 G4double emax = param->MaxKinEnergy();
136
137 // define model of energy loss fluctuations
138 if (nullptr == FluctModel()) {
139 G4bool ion = (pname == "GenericIon" || pname == "alpha");
140 SetFluctModel(G4EmStandUtil::ModelOfFluctuations(ion));
141 }
142
143 if (nullptr == EmModel(0)) {
144 if(q > 0.0) { SetEmModel(new G4BraggModel()); }
145 else { SetEmModel(new G4ICRU73QOModel()); }
146 }
147 // to compute ranges correctly we have to use low-energy
148 // model even if activation limit is high
149 EmModel(0)->SetLowEnergyLimit(emin);
150
151 // high energy limit may be eth or DBL_MAX
152 G4double emax1 = (EmModel(0)->HighEnergyLimit() < emax) ? eth : emax;
153 EmModel(0)->SetHighEnergyLimit(emax1);
154 AddEmModel(1, EmModel(0), FluctModel());
155
156 // second model is used if the first does not cover energy range
157 if(emax1 < emax) {
158 if (nullptr == EmModel(1)) { SetEmModel(new G4BetheBlochModel()); }
159 EmModel(1)->SetLowEnergyLimit(emax1);
160
161 // for extremely heavy particles upper limit of the model
162 // should be increased
163 emax = std::max(emax, eth*10);
164 EmModel(1)->SetHighEnergyLimit(emax);
165 AddEmModel(2, EmModel(1), FluctModel());
166 }
167 isInitialised = true;
168 }
169 }
170
171 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
172
173 void G4hIonisation::ProcessDescription(std::ostream& out) const
174 {
175 out << " Hadron ionisation";
176 G4VEnergyLossProcess::ProcessDescription(out);
177 }
178
179 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
180