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27 // -------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4CoulombScattering
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 22.08.2004
37 //
38 // Modifications:
39 // 01.08.06 V.Ivanchenko add choice between G4
40 // G4CoulombScatteringModel
41 //
42
43 //
44 // -------------------------------------------
45 //
46 //....oooOO0OOooo........oooOO0OOooo........oo
47 //....oooOO0OOooo........oooOO0OOooo........oo
48
49 #include "G4CoulombScattering.hh"
50 #include "G4SystemOfUnits.hh"
51 #include "G4eCoulombScatteringModel.hh"
52 #include "G4IonCoulombScatteringModel.hh"
53 #include "G4Proton.hh"
54 #include "G4EmParameters.hh"
55
56 //....oooOO0OOooo........oooOO0OOooo........oo
57
58 G4CoulombScattering::G4CoulombScattering(const
59 : G4VEmProcess(nam),
60 q2Max(CLHEP::TeV*CLHEP::TeV),
61 isCombined(comb)
62 {
63 SetBuildTableFlag(true);
64 SetStartFromNullFlag(false);
65 SetSplineFlag(false);
66 SetCrossSectionType(fEmOnePeak);
67 SetSecondaryParticle(G4Proton::Proton());
68 SetProcessSubType(fCoulombScattering);
69 }
70
71 //....oooOO0OOooo........oooOO0OOooo........oo
72
73 G4CoulombScattering::G4CoulombScattering(const
74 : G4CoulombScattering(nam, true)
75 {}
76
77 //....oooOO0OOooo........oooOO0OOooo........oo
78
79 G4CoulombScattering::G4CoulombScattering(G4boo
80 : G4CoulombScattering("CoulombScat", comb)
81 {}
82
83 //....oooOO0OOooo........oooOO0OOooo........oo
84
85 G4CoulombScattering::~G4CoulombScattering() =
86
87 //....oooOO0OOooo........oooOO0OOooo........oo
88
89 G4bool G4CoulombScattering::IsApplicable(const
90 {
91 return (p.GetPDGCharge() != 0.0);
92 }
93
94 //....oooOO0OOooo........oooOO0OOooo........oo
95
96 void G4CoulombScattering::InitialiseProcess(co
97 {
98 // second initialisation not allowed for the
99 // this means that polar angle limit change
100 // after first initialisation
101 if(isInitialised) { return; }
102
103 G4EmParameters* param = G4EmParameters::Inst
104 G4double a = param->FactorForAngleLimit()*CL
105 q2Max = 0.5*a*a;
106 G4double theta = param->MscThetaLimit();
107
108 // restricted or non-restricted cross sectio
109 if(isCombined) {
110 if(theta == CLHEP::pi) {
111 // for restriced single scattering chang
112 SetCrossSectionType(fEmIncreasing);
113 SetStartFromNullFlag(true);
114 }
115 } else {
116 SetSplineFlag(true);
117 SetCrossSectionType(fEmDecreasing);
118 }
119 isInitialised = true;
120 G4double mass = p->GetPDGMass();
121 G4String name = p->GetParticleName();
122
123 G4bool ion = false;
124 if (mass > CLHEP::GeV || p->GetParticleType(
125 SetBuildTableFlag(false);
126 ion = true;
127 if(name != "GenericIon") { SetVerboseLevel
128 } else {
129 if(name != "e-" && name != "e+" &&
130 name != "mu+" && name != "mu-" && name
131 name != "kaon+" && name != "proton" ) {
132 }
133 /*
134 G4cout << "### G4CoulombScattering::Initiali
135 << p->GetParticleName()
136 << " Emin(MeV)= " << MinKinEnergy()/MeV
137 << " Emax(TeV)= " << MaxKinEnergy()/TeV
138 << " nbins= " << LambdaBinning()
139 << " theta= " << theta
140 << " mass(MeV)= " << mass
141 << " isCombined=" << isCombined
142 << " ion=" << ion
143 << G4endl;
144 */
145 if(nullptr == EmModel(0)) {
146 if(ion) { SetEmModel(new G4IonCoulombScatt
147 else { SetEmModel(new G4eCoulombScattering
148 }
149 G4VEmModel* model = EmModel(0);
150 G4double emin = std::max(param->MinKinEnergy
151 G4double emax = std::min(param->MaxKinEnergy
152 model->SetPolarAngleLimit(theta);
153 model->SetLowEnergyLimit(emin);
154 model->SetHighEnergyLimit(emax);
155 AddEmModel(1, model);
156 }
157
158 //....oooOO0OOooo........oooOO0OOooo........oo
159
160 G4double G4CoulombScattering::MinPrimaryEnergy
161 const G4Material* mat)
162 {
163 // Pure Coulomb scattering
164 G4double emin = 0.0;
165
166 // Coulomb scattering combined with multiple
167 G4double theta = G4EmParameters::Instance()-
168
169 if(0.0 < theta) {
170 G4double p2 = q2Max*mat->GetIonisation()->
171 G4double mass = part->GetPDGMass();
172 emin = p2/(std::sqrt(p2 + mass*mass) + mas
173 }
174
175 return emin;
176 }
177
178 //....oooOO0OOooo........oooOO0OOooo........oo
179
180 void G4CoulombScattering::StreamProcessInfo(st
181 {
182 G4double tetmin = G4EmParameters::Instance()
183 outFile << " ";
184 if(tetmin > 179.) { outFile << "ThetaMin(p)"
185 else { outFile << tetmin; }
186 outFile << " < Theta(degree) < 180";
187
188 if(q2Max < DBL_MAX) {
189 outFile << ", pLimit(GeV^1)= " << std::sqr
190 }
191 outFile << G4endl;
192 }
193
194 //....oooOO0OOooo........oooOO0OOooo........oo
195
196 void G4CoulombScattering::ProcessDescription(s
197 {
198 out <<
199 " Coulomb scattering. Simulation of elastic
200 " events individually. May be used in com
201 " scattering, where Coulomb scattering is
202 " collisions and multiple scattering for
203 G4VEmProcess::ProcessDescription(out);
204 }
205
206 //....oooOO0OOooo........oooOO0OOooo........oo
207