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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4WentzelVIRelModel
33 //
34 // Author: V.Ivanchenko
35 //
36 // Creation date: 08.06.2012 from G4WentzelVIRelModel
37 //
38 // Modifications:
39 //
40 // Class Description:
41 //
42 // Implementation of the model of multiple scattering based on
43 // G.Wentzel, Z. Phys. 40 (1927) 590.
44 // H.W.Lewis, Phys Rev 78 (1950) 526.
45 // J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
46 // L.Urban, CERN-OPEN-2006-077.
47
48 // -------------------------------------------------------------------
49 //
50
51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53
54 #include "G4WentzelVIRelModel.hh"
55 #include "G4WentzelVIRelXSection.hh"
56 #include "G4WentzelOKandVIxSection.hh"
57 #include "G4PhysicalConstants.hh"
58 #include "G4SystemOfUnits.hh"
59 #include "G4Material.hh"
60 #include "G4ElementVector.hh"
61 #include "G4ProductionCutsTable.hh"
62 #include "G4NistManager.hh"
63 #include "G4EmParameters.hh"
64 #include "G4AutoLock.hh"
65
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67
68 std::vector<G4double> G4WentzelVIRelModel::effMass;
69
70 namespace
71 {
72 G4Mutex theWVIRelMutex = G4MUTEX_INITIALIZER;
73 }
74
75 G4WentzelVIRelModel::G4WentzelVIRelModel() :
76 G4WentzelVIModel(true, "WentzelVIRel")
77 {
78 fNistManager = G4NistManager::Instance();
79 auto ptr = new G4WentzelVIRelXSection();
80 SetWVICrossSection(static_cast<G4WentzelOKandVIxSection*>(ptr));
81 }
82
83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
84
85 G4WentzelVIRelModel::~G4WentzelVIRelModel() = default;
86
87 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
88
89 void G4WentzelVIRelModel::Initialise(const G4ParticleDefinition* p,
90 const G4DataVector& cuts)
91 {
92 // Access to materials
93 const G4ProductionCutsTable* theCoupleTable =
94 G4ProductionCutsTable::GetProductionCutsTable();
95 if(theCoupleTable->GetTableSize() != effMass.size()) {
96 ComputeEffectiveMass();
97 }
98
99 G4WentzelVIModel::Initialise(p, cuts);
100 }
101
102 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
103
104 void G4WentzelVIRelModel::DefineMaterial(const G4MaterialCutsCouple* cup)
105 {
106 if(cup != currentCouple) {
107 currentCouple = cup;
108 SetCurrentCouple(cup);
109 currentMaterial = cup->GetMaterial();
110 currentMaterialIndex = currentCouple->GetIndex();
111 GetWVICrossSection()->SetTargetMass(effMass[currentMaterialIndex]);
112 }
113 }
114
115 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
116
117 G4double G4WentzelVIRelModel::ComputeCrossSectionPerAtom(
118 const G4ParticleDefinition* p,
119 G4double kinEnergy,
120 G4double Z, G4double,
121 G4double cutEnergy, G4double)
122 {
123 G4double cross = 0.0;
124 if(p != particle) { SetupParticle(p); }
125 if(kinEnergy < lowEnergyLimit) { return cross; }
126 if(nullptr == CurrentCouple()) {
127 G4Exception("G4WentzelVIRelModel::ComputeCrossSectionPerAtom", "em0011",
128 FatalException, " G4MaterialCutsCouple is not defined");
129 return cross;
130 }
131 DefineMaterial(CurrentCouple());
132 G4int iz = G4lrint(Z);
133 G4double tmass = (1 == iz) ? CLHEP::proton_mass_c2
134 : fNistManager->GetAtomicMassAmu(iz)*amu_c2;
135 wokvi->SetTargetMass(tmass);
136 cosTetMaxNuc = wokvi->SetupKinematic(kinEnergy, currentMaterial);
137 if(cosTetMaxNuc < 1.0) {
138 G4double cost = wokvi->SetupTarget(iz, cutEnergy);
139 cross = wokvi->ComputeTransportCrossSectionPerAtom(cost);
140 /*
141 //if(p->GetParticleName() == "e-")
142 G4cout << "G4WentzelVIRelModel::CS: Z= " << G4int(Z)
143 << " e(MeV)= " << kinEnergy
144 << " 1-cosN= " << 1 - cosTetMaxNuc << " cross(bn)= " << cross/barn
145 << " " << particle->GetParticleName() << G4endl;
146 */
147 }
148 return cross;
149 }
150
151 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
152
153 void G4WentzelVIRelModel::ComputeEffectiveMass()
154 {
155 const G4ProductionCutsTable* theCoupleTable =
156 G4ProductionCutsTable::GetProductionCutsTable();
157 std::size_t ncouples = (G4int)theCoupleTable->GetTableSize();
158 if(ncouples == effMass.size()) { return; }
159
160 G4AutoLock l(&theWVIRelMutex);
161 if(ncouples != effMass.size()) {
162 effMass.resize(ncouples, 0.0);
163 for(std::size_t i=0; i<ncouples; ++i) {
164 const G4Material* mat =
165 theCoupleTable->GetMaterialCutsCouple((G4int)i)->GetMaterial();
166 const G4ElementVector* elmVector = mat->GetElementVector();
167 std::size_t nelm = mat->GetNumberOfElements();
168 G4double sum = 0.0;
169 G4double norm= 0.0;
170 for(std::size_t j=0; j<nelm; ++j) {
171 G4int Z = (*elmVector)[j]->GetZasInt();
172 G4double mass = fNistManager->GetAtomicMassAmu(Z)*CLHEP::amu_c2;
173 G4int Z2 = Z*Z;
174 sum += mass*Z2;
175 norm += Z2;
176 }
177 effMass[i] = (0.0 < norm) ? sum/norm : sum;
178 }
179 }
180 l.unlock();
181 }
182
183 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
184