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25 // 25 //
>> 26 // $Id: G4EmElementSelector.cc,v 1.4 2008/08/21 18:53:32 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-02-patch-01 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4EmElementSelector 34 // File name: G4EmElementSelector
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 29.05.2008 38 // Creation date: 29.05.2008
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 41 //
40 // Class Description: 42 // Class Description:
41 // 43 //
42 // Generic helper class for the random selecti 44 // Generic helper class for the random selection of an element
43 45
44 // ------------------------------------------- 46 // -------------------------------------------------------------------
45 // 47 //
46 48
47 #include "G4EmElementSelector.hh" 49 #include "G4EmElementSelector.hh"
48 #include "G4VEmModel.hh" 50 #include "G4VEmModel.hh"
49 #include "G4SystemOfUnits.hh" <<
50 51
51 //....oooOO0OOooo........oooOO0OOooo........oo 52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
52 //....oooOO0OOooo........oooOO0OOooo........oo 53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53 54
54 G4EmElementSelector::G4EmElementSelector(G4VEm 55 G4EmElementSelector::G4EmElementSelector(G4VEmModel* mod,
55 const << 56 const G4Material* mat,
56 G4int << 57 G4int bins,
57 G4dou << 58 G4double emin,
58 G4dou << 59 G4double emax,
59 G4boo << 60 G4bool spline):
60 model(mod), material(mat), nbins(bins), cutE 61 model(mod), material(mat), nbins(bins), cutEnergy(-1.0),
61 lowEnergy(emin), highEnergy(emax) 62 lowEnergy(emin), highEnergy(emax)
62 { 63 {
63 G4int n = (G4int)material->GetNumberOfElemen << 64 G4int n = material->GetNumberOfElements();
64 nElmMinusOne = n - 1; 65 nElmMinusOne = n - 1;
65 theElementVector = material->GetElementVecto 66 theElementVector = material->GetElementVector();
66 if(nElmMinusOne > 0) { 67 if(nElmMinusOne > 0) {
67 xSections.reserve(n); << 68 for(G4int i=0; i<nElmMinusOne; i++) {
68 auto v0 = new G4PhysicsLogVector(lowEnergy << 69 G4PhysicsLogVector* v = new G4PhysicsLogVector(lowEnergy,highEnergy,nbins);
69 xSections.push_back(v0); << 70 v->SetSpline(spline);
70 for(G4int i=1; i<n; ++i) { <<
71 auto v = new G4PhysicsLogVector(*v0); <<
72 xSections.push_back(v); 71 xSections.push_back(v);
73 } 72 }
74 } 73 }
75 /* << 74 //G4cout << "G4EmElementSelector for " << mat->GetName() << " n= " << n << G4endl;
76 G4cout << "G4EmElementSelector for " << mat- <<
77 << " nbins= " << nbins << " Emin= " <<
78 << " Emax= " << highEnergy << G4endl; <<
79 */ <<
80 } 75 }
81 76
82 //....oooOO0OOooo........oooOO0OOooo........oo 77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
83 78
84 G4EmElementSelector::~G4EmElementSelector() 79 G4EmElementSelector::~G4EmElementSelector()
85 { 80 {
86 if(nElmMinusOne > 0) { 81 if(nElmMinusOne > 0) {
87 for(G4int i=0; i<=nElmMinusOne; ++i) { del << 82 for(G4int i=0; i<nElmMinusOne; i++) {
>> 83 delete xSections[i];
>> 84 }
88 } 85 }
89 } 86 }
90 87
91 //....oooOO0OOooo........oooOO0OOooo........oo 88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
92 89
93 void G4EmElementSelector::Initialise(const G4P 90 void G4EmElementSelector::Initialise(const G4ParticleDefinition* part,
94 G4double << 91 G4double cut)
95 { 92 {
96 //G4cout << "G4EmElementSelector initialise << 93 //G4cout << "G4EmElementSelector initialise for " << material->GetName() << G4endl;
97 // << G4endl; << 94 if(0 == nElmMinusOne || cut == cutEnergy) return;
98 if(0 == nElmMinusOne || cut == cutEnergy) { <<
99 95
100 cutEnergy = cut; 96 cutEnergy = cut;
101 //G4cout << "cut(keV)= " << cut/keV << G4end 97 //G4cout << "cut(keV)= " << cut/keV << G4endl;
102 G4double cross; 98 G4double cross;
103 99
104 const G4double* theAtomNumDensityVector = << 100 const G4double* theAtomNumDensityVector = material->GetVecNbOfAtomsPerVolume();
105 material->GetVecNbOfAtomsPerVolume(); << 101
>> 102 G4int i;
>> 103 G4int n = nElmMinusOne + 1;
>> 104 G4double* xsec = new G4double[n];
106 105
107 // loop over bins 106 // loop over bins
108 for(G4int j=0; j<=nbins; ++j) { << 107 for(G4int j=0; j<nbins; j++) {
109 G4double e = (xSections[0])->Energy(j); << 108 G4double e = (xSections[0])->GetLowEdgeEnergy(j);
110 model->SetupForMaterial(part, material, e) 109 model->SetupForMaterial(part, material, e);
111 cross = 0.0; 110 cross = 0.0;
112 //G4cout << "j= " << j << " e(MeV)= " << e 111 //G4cout << "j= " << j << " e(MeV)= " << e/MeV << G4endl;
113 for (G4int i=0; i<=nElmMinusOne; ++i) { << 112 for (i=0; i<n; i++) {
114 cross += theAtomNumDensityVector[i]* 113 cross += theAtomNumDensityVector[i]*
115 model->ComputeCrossSectionPerAtom(part << 114 model->ComputeCrossSectionPerAtom(part, (*theElementVector)[i], e,
116 cutE << 115 cutEnergy, e);
117 xSections[i]->PutValue(j, cross); << 116 xsec[i] = cross;
118 } << 117 }
119 } << 118 if(DBL_MIN >= cross) cross = 1.0;
120 // xSections start from null, so use probabi << 119 // normalise cross section sum
121 if(0.0 == (*xSections[nElmMinusOne])[0]) { << 120 for (i=0; i<nElmMinusOne; i++) {
122 for (G4int i=0; i<=nElmMinusOne; ++i) { << 121 xSections[i]->PutValue(j, xsec[i]/cross);
123 xSections[i]->PutValue(0, (*xSections[i] << 122 //G4cout << "i= " << i << " xs= " << xsec[i]/cross << G4endl;
124 } <<
125 } <<
126 // xSections ends with null, so use probabil <<
127 if(0.0 == (*xSections[nElmMinusOne])[nbins]) <<
128 for (G4int i=0; i<=nElmMinusOne; ++i) { <<
129 xSections[i]->PutValue(nbins, (*xSection <<
130 } <<
131 } <<
132 // perform normalization <<
133 for(G4int j=0; j<=nbins; ++j) { <<
134 cross = (*xSections[nElmMinusOne])[j]; <<
135 // only for positive X-section <<
136 if(cross > 0.0) { <<
137 for (G4int i=0; i<nElmMinusOne; ++i) { <<
138 G4double x = (*xSections[i])[j]/cross; <<
139 xSections[i]->PutValue(j, x); <<
140 } <<
141 } <<
142 } <<
143 /* <<
144 G4cout << "======== G4EmElementSelector for <<
145 << G4endl; <<
146 for (G4int i=0; i<=nElmMinusOne; ++i) { <<
147 G4cout << "#### i=" << i << G4endl; <<
148 G4cout << (*xSections[i]) << G4endl; <<
149 } <<
150 */ <<
151 } <<
152 <<
153 //....oooOO0OOooo........oooOO0OOooo........oo <<
154 <<
155 const G4Element* <<
156 G4EmElementSelector::SelectRandomAtom(const G4 <<
157 const G4 <<
158 { <<
159 const G4Element* element = (*theElementVecto <<
160 if (nElmMinusOne > 0) { <<
161 // 1. Determine energy index (only once) <<
162 // handle cases below/above the enrgy grid <<
163 // ekin = x[0] if e<=x[0] and idx will <<
164 // ekin = x[N-1] if e>=x[N-1] and idx will <<
165 G4double ekin = e; <<
166 std::size_t idx = 0; <<
167 if(e <= (xSections[0])->Energy(0)) { <<
168 ekin = (xSections[0])->Energy(0); <<
169 } else if(e < (xSections[0])->GetMaxEnergy <<
170 idx = (xSections[0])->ComputeLogVectorBi <<
171 } else { <<
172 ekin = (xSections[0])->GetMaxEnergy(); <<
173 idx = (xSections[0])->GetVectorLength() <<
174 } <<
175 // 2. Do the linear interp.(corner cases a <<
176 const G4double x1 = (xSections[0])->Energy <<
177 const G4double a = (ekin - x1)/((xSection <<
178 const G4double urnd = G4UniformRand(); <<
179 for (G4int i = 0; i < nElmMinusOne; ++i) { <<
180 const G4double y1 = (*xSections[i])[idx <<
181 if (urnd <= y1 + a*((*xSections[i])[idx+ <<
182 element = (*theElementVector)[i]; <<
183 break; <<
184 } <<
185 } 123 }
186 } 124 }
187 return element; << 125 delete [] xsec;
188 } 126 }
189 127
190 //....oooOO0OOooo........oooOO0OOooo........oo 128 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
191 129
192 void G4EmElementSelector::Dump(const G4Particl 130 void G4EmElementSelector::Dump(const G4ParticleDefinition* part)
193 { 131 {
194 G4cout << "======== G4EmElementSelector for 132 G4cout << "======== G4EmElementSelector for the " << model->GetName();
195 if(part) G4cout << " and " << part->GetParti 133 if(part) G4cout << " and " << part->GetParticleName();
196 G4cout << " for " << material->GetName() << 134 G4cout << " for " << material->GetName() << " ========" << G4endl;
197 if(0 < nElmMinusOne) { 135 if(0 < nElmMinusOne) {
198 for(G4int i=0; i<nElmMinusOne; i++) { 136 for(G4int i=0; i<nElmMinusOne; i++) {
199 G4cout << " " << (*theElementVector 137 G4cout << " " << (*theElementVector)[i]->GetName() << " : " << G4endl;
200 G4cout << *(xSections[i]) << G4endl; 138 G4cout << *(xSections[i]) << G4endl;
201 } 139 }
202 } 140 }
203 G4cout << "Last Element in element vector " << 141 G4cout << "Last Element in element vector"
204 << (*theElementVector)[nElmMinusOne]- << 142 << (*theElementVector)[nElmMinusOne]->GetName()
205 << G4endl; << 143 << G4endl;
206 G4cout << G4endl; <<
207 } 144 }
208 145
209 //....oooOO0OOooo........oooOO0OOooo........oo 146 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
210 147
211 148
212 149