| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class header file 29 // GEANT4 Class header file
30 // 30 //
31 // 31 //
32 // File name: G4EmElementSelector 32 // File name: G4EmElementSelector
33 // 33 //
34 // Author: Vladimir Ivanchenko 34 // Author: Vladimir Ivanchenko
35 // 35 //
36 // Creation date: 29.05.2008 36 // Creation date: 29.05.2008
37 // 37 //
38 // Modifications: 38 // Modifications:
39 // 39 //
40 // 40 //
41 // Class Description: 41 // Class Description:
42 // 42 //
43 // Generic helper class for the random selecti 43 // Generic helper class for the random selection of an element
44 44
45 // ------------------------------------------- 45 // -------------------------------------------------------------------
46 // 46 //
47 47
48 #ifndef G4EmElementSelector_h 48 #ifndef G4EmElementSelector_h
49 #define G4EmElementSelector_h 1 49 #define G4EmElementSelector_h 1
50 50
51 #include "globals.hh" 51 #include "globals.hh"
52 #include "G4ParticleDefinition.hh" 52 #include "G4ParticleDefinition.hh"
53 #include "G4Material.hh" 53 #include "G4Material.hh"
54 #include "G4Element.hh" 54 #include "G4Element.hh"
55 #include "G4ElementVector.hh" 55 #include "G4ElementVector.hh"
56 #include "G4PhysicsLogVector.hh" 56 #include "G4PhysicsLogVector.hh"
57 #include "Randomize.hh" 57 #include "Randomize.hh"
58 #include <vector> 58 #include <vector>
59 59
60 class G4VEmModel; 60 class G4VEmModel;
61 61
62 class G4EmElementSelector 62 class G4EmElementSelector
63 { 63 {
64 64
65 public: 65 public:
66 66
67 G4EmElementSelector(G4VEmModel*, const G4Mat 67 G4EmElementSelector(G4VEmModel*, const G4Material*, G4int bins,
68 G4double emin, G4double 68 G4double emin, G4double emax,
69 G4bool spline = true); 69 G4bool spline = true);
70 70
71 ~G4EmElementSelector(); 71 ~G4EmElementSelector();
72 72
73 void Initialise(const G4ParticleDefinition*, 73 void Initialise(const G4ParticleDefinition*, G4double cut = 0.0);
74 74
75 void Dump(const G4ParticleDefinition* p = nu 75 void Dump(const G4ParticleDefinition* p = nullptr);
76 76
77 const G4Element* SelectRandomAtom(const G4do <<
78 const G4do <<
79 <<
80 inline const G4Element* SelectRandomAtom(G4d 77 inline const G4Element* SelectRandomAtom(G4double kineticEnergy) const;
>> 78 inline const G4Element* SelectRandomAtom(const G4double kineticEnergy,
>> 79 const G4double logEKin) const;
81 80
82 inline const G4Material* GetMaterial() const 81 inline const G4Material* GetMaterial() const;
83 82
>> 83 private:
>> 84
84 // hide assignment operator 85 // hide assignment operator
85 G4EmElementSelector & operator=(const G4EmE 86 G4EmElementSelector & operator=(const G4EmElementSelector &right) = delete;
86 G4EmElementSelector(const G4EmElementSelect 87 G4EmElementSelector(const G4EmElementSelector&) = delete;
87 88
88 private: <<
89 <<
90 G4VEmModel* model; 89 G4VEmModel* model;
91 const G4Material* material; 90 const G4Material* material;
92 const G4ElementVector* theElementVector; 91 const G4ElementVector* theElementVector;
93 92
94 G4int nElmMinusOne; 93 G4int nElmMinusOne;
95 G4int nbins; 94 G4int nbins;
96 95
97 G4double cutEnergy; 96 G4double cutEnergy;
98 G4double lowEnergy; 97 G4double lowEnergy;
99 G4double highEnergy; 98 G4double highEnergy;
100 99
101 std::vector<G4PhysicsLogVector*> xSections; 100 std::vector<G4PhysicsLogVector*> xSections;
102 101
103 }; 102 };
104 103
105 //....oooOO0OOooo........oooOO0OOooo........oo 104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
106 //....oooOO0OOooo........oooOO0OOooo........oo 105 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
107 106
108 inline const G4Element* G4EmElementSelector::S 107 inline const G4Element* G4EmElementSelector::SelectRandomAtom(G4double e) const
109 { 108 {
110 const G4Element* element = (*theElementVecto 109 const G4Element* element = (*theElementVector)[nElmMinusOne];
111 if (nElmMinusOne > 0) { 110 if (nElmMinusOne > 0) {
112 G4double x = G4UniformRand(); 111 G4double x = G4UniformRand();
113 size_t idx(0); 112 size_t idx(0);
114 for(G4int i=0; i<nElmMinusOne; ++i) { 113 for(G4int i=0; i<nElmMinusOne; ++i) {
115 if (x <= (xSections[i])->Value(e, idx)) 114 if (x <= (xSections[i])->Value(e, idx)) {
>> 115 element = (*theElementVector)[i];
>> 116 break;
>> 117 }
>> 118 }
>> 119 }
>> 120 return element;
>> 121 }
>> 122
>> 123 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
>> 124 inline const G4Element*
>> 125 G4EmElementSelector::SelectRandomAtom(const G4double e,const G4double loge)const
>> 126 {
>> 127 const G4Element* element = (*theElementVector)[nElmMinusOne];
>> 128 if (nElmMinusOne > 0) {
>> 129 // 1. Determine energy index (only once)
>> 130 const size_t nBins = (xSections[0])->GetVectorLength();
>> 131 // handle cases below/above the enrgy grid (by ekin, idx that gives a=0/1)
>> 132 // ekin = x[0] if e<=x[0] and idx will be 0 ^ a=0 => so y=y0
>> 133 // ekin = x[N-1] if e>=x[N-1] and idx will be N-2 ^ a=1 => so y=y_{N-1}
>> 134 const G4double ekin = std::max((xSections[0])->Energy(0),
>> 135 std::min((xSections[0])->Energy(nBins-1),e));
>> 136 // compute the lower index of the bin (idx \in [0,N-2] will be guaranted)
>> 137 const size_t idx = (xSections[0])->ComputeLogVectorBin(loge);
>> 138 // 2. Do the linear interp.(robust for corner cases through ekin, idx and a)
>> 139 const G4double x1 = (xSections[0])->Energy(idx);
>> 140 const G4double x2 = (xSections[0])->Energy(idx+1);
>> 141 // note: all corner cases of the previous methods are covered and eventually
>> 142 // gives a=0/1 that results in y=y0\y_{N-1} if e<=x[0]/e>=x[N-1] or
>> 143 // y=y_i/y_{i+1} if e<x[i]/e>=x[i+1] due to small numerical errors
>> 144 const G4double a = std::max(0., std::min(1., (ekin - x1)/(x2 - x1)));
>> 145 const G4double urnd = G4UniformRand();
>> 146 for (G4int i = 0; i < nElmMinusOne; ++i) {
>> 147 const G4double y1 = (*xSections[i])[idx];
>> 148 const G4double y2 = (*xSections[i])[idx+1];
>> 149 if (urnd <= y1 + a*(y2-y1)) {
116 element = (*theElementVector)[i]; 150 element = (*theElementVector)[i];
117 break; 151 break;
118 } 152 }
119 } 153 }
120 } 154 }
121 return element; 155 return element;
122 } 156 }
123 157
124 //....oooOO0OOooo........oooOO0OOooo........oo 158 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
125 159
126 inline const G4Material* G4EmElementSelector:: 160 inline const G4Material* G4EmElementSelector::GetMaterial() const
127 { 161 {
128 return material; 162 return material;
129 } 163 }
130 164
131 //....oooOO0OOooo........oooOO0OOooo........oo 165 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
132 166
133 #endif 167 #endif
134 168
135 169