| Geant4 Cross Reference |
1 //
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18 // * This code implementation is the result of the scientific and *
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24 // ********************************************************************
25 //
26 //
27 //
28 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
29 //
30 // History:
31 // -----------
32 // 1 Aug 2001 MGP Created
33 // 19 Jul 2002 VI Create composite data set for material
34 // 24 Apr 2003 VI Cut per region mfpt
35 //
36 // 15 Jul 2009 Nicolas A. Karakatsanis
37 //
38 // - BuildCrossSectionForMaterials method was revised in order to calculate the
39 // logarithmic values of the loaded data.
40 // It retrieves the data values from the G4EMLOW data files but, then, calculates the
41 // respective log values and loads them to seperate data structures.
42 // The EM data sets, initialized this way, contain both non-log and log values.
43 // These initialized data sets can enhance the computing performance of data interpolation
44 // operations
45 //
46 // -------------------------------------------------------------------
47
48 #include "G4CrossSectionHandler.hh"
49 #include "G4VDataSetAlgorithm.hh"
50 #include "G4VEMDataSet.hh"
51 #include "G4EMDataSet.hh"
52 #include "G4CompositeEMDataSet.hh"
53 #include "G4ShellEMDataSet.hh"
54 #include "G4ProductionCutsTable.hh"
55 #include "G4Material.hh"
56 #include "G4Element.hh"
57 #include "Randomize.hh"
58 #include <map>
59 #include <vector>
60
61 #include "G4LogLogInterpolation.hh"
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64
65 G4CrossSectionHandler::G4CrossSectionHandler()
66 { }
67
68 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
69
70 G4CrossSectionHandler::~G4CrossSectionHandler()
71 { }
72
73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
74
75 std::vector<G4VEMDataSet*>*
76 G4CrossSectionHandler::BuildCrossSectionsForMaterials(const G4DataVector& energyVector,
77 const G4DataVector*)
78 {
79 G4DataVector* energies;
80 G4DataVector* data;
81
82 G4DataVector* log_energies;
83 G4DataVector* log_data;
84
85 std::vector<G4VEMDataSet*>* matCrossSections = new std::vector<G4VEMDataSet*>;
86
87 const G4ProductionCutsTable* theCoupleTable=
88 G4ProductionCutsTable::GetProductionCutsTable();
89 G4int numOfCouples = (G4int)theCoupleTable->GetTableSize();
90
91 std::size_t nOfBins = energyVector.size();
92 const G4VDataSetAlgorithm* interpolationAlgo = CreateInterpolation();
93
94 for (G4int mLocal=0; mLocal<numOfCouples; ++mLocal)
95 {
96 const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(mLocal);
97 const G4Material* material= couple->GetMaterial();
98 G4int nElements = (G4int)material->GetNumberOfElements();
99 const G4ElementVector* elementVector = material->GetElementVector();
100 const G4double* nAtomsPerVolume = material->GetAtomicNumDensityVector();
101
102 G4VDataSetAlgorithm* algo = interpolationAlgo->Clone();
103
104 G4VEMDataSet* setForMat = new G4CompositeEMDataSet(algo,1.,1.);
105
106 for (G4int i=0; i<nElements; ++i) {
107
108 G4int Z = (G4int) (*elementVector)[i]->GetZ();
109 G4double density = nAtomsPerVolume[i];
110
111 energies = new G4DataVector;
112 data = new G4DataVector;
113
114 log_energies = new G4DataVector;
115 log_data = new G4DataVector;
116
117 for (std::size_t bin=0; bin<nOfBins; ++bin)
118 {
119 G4double e = energyVector[bin];
120 energies->push_back(e);
121 if (e==0.) e=1e-300;
122 log_energies->push_back(std::log10(e));
123 G4double cross = density*FindValue(Z,e);
124 data->push_back(cross);
125 if (cross==0.) cross=1e-300;
126 log_data->push_back(std::log10(cross));
127 }
128
129 G4VDataSetAlgorithm* algo1 = interpolationAlgo->Clone();
130 G4VEMDataSet* elSet = new G4EMDataSet(i,energies,data,log_energies,log_data,algo1,1.,1.);
131
132 setForMat->AddComponent(elSet);
133 }
134
135 matCrossSections->push_back(setForMat);
136 }
137 delete interpolationAlgo;
138 return matCrossSections;
139 }
140
141