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26 // 26 //
27 // ------------------------------------------- 27 // ----------------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class header file 29 // GEANT4 Class header file
30 // 30 //
31 // 31 //
32 // File name: G4SBBremTable 32 // File name: G4SBBremTable
33 // 33 //
34 // Author: Mihaly Novak 34 // Author: Mihaly Novak
35 // 35 //
36 // Creation date: 15.07.2018 36 // Creation date: 15.07.2018
37 // 37 //
38 // Modifications: 38 // Modifications:
39 // 39 //
40 // Class description: 40 // Class description:
41 // 41 //
42 // Utility class to handle sampling tables for 42 // Utility class to handle sampling tables for the Seltzer-Berger scalled brems-
43 // strahlung differential cross sections. It m 43 // strahlung differential cross sections. It makes possible fast (significantly
44 // faster than the rejection) sampling of the 44 // faster than the rejection) sampling of the emitted photon energy in case of
45 // interactions. An object from this class is 45 // interactions. An object from this class is supposed to be a member of the
46 // Seltzer-Berger model for e-/e+ bremsstrahlu 46 // Seltzer-Berger model for e-/e+ bremsstrahlung photon emission model. Note,
47 // that one object from this class can handle 47 // that one object from this class can handle both e- and e+ cases (containes
48 // e+ correction in the SampleEnergyTransfer m 48 // e+ correction in the SampleEnergyTransfer method only).
49 // 49 //
50 // ------------------------------------------- 50 // ----------------------------------------------------------------------------
51 51
52 #ifndef G4SBBremTable_h 52 #ifndef G4SBBremTable_h
53 #define G4SBBremTable_h 1 53 #define G4SBBremTable_h 1
54 54
55 #include "globals.hh" 55 #include "globals.hh"
56 #include "G4String.hh" 56 #include "G4String.hh"
57 57
58 #include <vector> 58 #include <vector>
59 59
60 // forward declar 60 // forward declar
61 class G4MaterialCutsCouple; 61 class G4MaterialCutsCouple;
62 62
63 class G4SBBremTable { 63 class G4SBBremTable {
64 64
65 public: 65 public:
66 // CTR/DTR 66 // CTR/DTR
67 G4SBBremTable(); 67 G4SBBremTable();
68 68
69 ~G4SBBremTable(); 69 ~G4SBBremTable();
70 70
71 // loads and init sampling tables: lowe/hig 71 // loads and init sampling tables: lowe/highe are the low/high energy usage
72 // limits of the corresponding Seltzerberge 72 // limits of the corresponding Seltzerberger-model.
73 void Initialize(const G4double lowe, const 73 void Initialize(const G4double lowe, const G4double highe);
74 74
75 // clean away all sampling tables and makes 75 // clean away all sampling tables and makes ready for re-initialisation
76 void ClearSamplingTables(); 76 void ClearSamplingTables();
77 77
78 // run-time method to sample energy transfe 78 // run-time method to sample energy transferred to the emitted photon
79 double SampleEnergyTransfer(const G4double 79 double SampleEnergyTransfer(const G4double eekin, const G4double leekin,
80 const G4double 80 const G4double gcut , const G4double dielSupConst,
81 const G4int 81 const G4int izet , const G4int matCutIndx,
82 const bool 82 const bool iselectron);
83 83
84 // used only for development: print out tab 84 // used only for development: print out table related information
85 // void Dump(); 85 // void Dump();
86 86
87 private: 87 private:
88 88
89 void BuildSamplingTables(); 89 void BuildSamplingTables();
90 90
91 void InitSamplingTables(); 91 void InitSamplingTables();
92 92
93 void LoadSTGrid(); 93 void LoadSTGrid();
94 94
95 void LoadSamplingTables(G4int iz); 95 void LoadSamplingTables(G4int iz);
96 96
97 void ReadCompressedFile(const G4String &fna 97 void ReadCompressedFile(const G4String &fname, std::istringstream &iss);
98 98
99 private: 99 private:
100 100
101 // Sampling-Table point: describes one [E_i] 101 // Sampling-Table point: describes one [E_i],[kappa_j] point
102 struct STPoint { 102 struct STPoint {
103 G4double fCum; // value of the cumulati 103 G4double fCum; // value of the cumulative function
104 G4double fParA; // rational function app 104 G4double fParA; // rational function approximation based interp. parameter
105 G4double fParB; // rational function app 105 G4double fParB; // rational function approximation based interp. parameter
106 }; 106 };
107 107
108 // Sampling-Table: describes one [E_j] e- en 108 // Sampling-Table: describes one [E_j] e- energy point i.e. one Table
109 struct STable { 109 struct STable {
110 // cumulative values for the kappa-cuts: k 110 // cumulative values for the kappa-cuts: kappa_cut_i=E_gamma_cut_i/E_el_j
111 std::vector<G4double> fCumCutValues; 111 std::vector<G4double> fCumCutValues;
112 // as many STPoint-s as kappa values 112 // as many STPoint-s as kappa values
113 std::vector<STPoint> fSTable; 113 std::vector<STPoint> fSTable;
114 }; 114 };
115 115
116 // Sampling-Tables for a given Z: 116 // Sampling-Tables for a given Z:
117 // describes all tables (i.e. for all e- ene 117 // describes all tables (i.e. for all e- energies) for a given element (Z)
118 struct SamplingTablePerZ { 118 struct SamplingTablePerZ {
119 SamplingTablePerZ() : fNumGammaCuts(0), fM 119 SamplingTablePerZ() : fNumGammaCuts(0), fMinElEnergyIndx(-1), fMaxElEnergyIndx(-1) {}
120 size_t fNumGammaCuts; / 120 size_t fNumGammaCuts; // number of gamma-cut for this
121 G4int fMinElEnergyIndx; / 121 G4int fMinElEnergyIndx; // max(i) such E_i <= E for all E
122 G4int fMaxElEnergyIndx; / 122 G4int fMaxElEnergyIndx; // min(i) such E_i >= E for all E
123 std::vector<STable*> fTablesPerEnergy; / 123 std::vector<STable*> fTablesPerEnergy; // as many table as e-ekin grid point
124 //the different gamma-cut values that are 124 //the different gamma-cut values that are defined for this element(Z) and ln
125 std::vector<G4double> fGammaECuts; 125 std::vector<G4double> fGammaECuts;
126 std::vector<G4double> fLogGammaECuts; 126 std::vector<G4double> fLogGammaECuts;
127 // the couple index element stores the cor 127 // the couple index element stores the corresponding (sorted) gamma-cut index
128 std::vector<size_t> fMatCutIndxToGamCutI 128 std::vector<size_t> fMatCutIndxToGamCutIndx;
129 // temporary vector to store some indecis 129 // temporary vector to store some indecis during initialisation
130 std::vector< std::vector<size_t> > fGamC 130 std::vector< std::vector<size_t> > fGamCutIndxToMatCutIndx;
131 }; 131 };
132 132
133 // simple linear search: most of the time fa 133 // simple linear search: most of the time faster than anything in our case
134 G4int LinSearch(const std::vector<STPoint>& 134 G4int LinSearch(const std::vector<STPoint>& vect,
135 const G4int size, 135 const G4int size,
136 const G4double val); 136 const G4double val);
137 137
138 private: 138 private:
139 139
140 // pre-prepared sampling tables are availabl 140 // pre-prepared sampling tables are available:
141 G4int fMaxZet; 141 G4int fMaxZet; // max Z number
142 G4int fNumElEnergy 142 G4int fNumElEnergy; // # e- kine (E_k) per Z
143 G4int fNumKappa; 143 G4int fNumKappa; // # red. photon eners per E_k
144 144
145 // min/max electron kinetic energy usage lim 145 // min/max electron kinetic energy usage limits
146 G4double fUsedLowEene 146 G4double fUsedLowEenergy;
147 G4double fUsedHighEen 147 G4double fUsedHighEenergy;
148 G4double fLogMinElEne 148 G4double fLogMinElEnergy;
149 G4double fILDeltaElEn 149 G4double fILDeltaElEnergy;
150 150
151 // e- kinetic energy and reduced photon ener 151 // e- kinetic energy and reduced photon energy grids and tehir logarithms
152 std::vector<G4double> fElEnergyVec 152 std::vector<G4double> fElEnergyVect;
153 std::vector<G4double> fLElEnergyVe 153 std::vector<G4double> fLElEnergyVect;
154 std::vector<G4double> fKappaVect; 154 std::vector<G4double> fKappaVect;
155 std::vector<G4double> fLKappaVect; 155 std::vector<G4double> fLKappaVect;
156 156
157 // container to store samplingtables per Z ( 157 // container to store samplingtables per Z (size is fMaxZet+1)
158 std::vector<SamplingTablePerZ*> fSBSamplingT 158 std::vector<SamplingTablePerZ*> fSBSamplingTables;
159 159
160 }; 160 };
161 161
162 #endif 162 #endif
163 163