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G4EmElementSelector.cc
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25 //
26 // $Id$
27 //
28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4EmElementSelector
34 //
35 // Author: Vladimir Ivanchenko
36 //
37 // Creation date: 29.05.2008
38 //
39 // Modifications:
40 //
41 // Class Description:
42 //
43 // Generic helper class for the random selection of an element
44 
45 // -------------------------------------------------------------------
46 //
47 
48 #include "G4EmElementSelector.hh"
49 #include "G4VEmModel.hh"
50 
51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53 
55  const G4Material* mat,
56  G4int bins,
57  G4double emin,
58  G4double emax,
59  G4bool spline):
60  model(mod), material(mat), nbins(bins), cutEnergy(-1.0),
61  lowEnergy(emin), highEnergy(emax)
62 {
63  G4int n = material->GetNumberOfElements();
64  nElmMinusOne = n - 1;
65  theElementVector = material->GetElementVector();
66  element = (*theElementVector)[0];
67  if(nElmMinusOne > 0) {
68  xSections.reserve(n);
69  G4PhysicsLogVector* v0 = new G4PhysicsLogVector(lowEnergy,highEnergy,nbins);
70  xSections.push_back(v0);
71  v0->SetSpline(spline);
72  for(G4int i=1; i<n; ++i) {
74  xSections.push_back(v);
75  }
76  }
77  //G4cout << "G4EmElementSelector for " << mat->GetName() << " n= " << n << G4endl;
78 }
79 
80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
81 
83 {
84  if(nElmMinusOne > 0) {
85  for(G4int i=0; i<=nElmMinusOne; ++i) {
86  delete xSections[i];
87  }
88  }
89 }
90 
91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
92 
94  G4double cut)
95 {
96  //G4cout << "G4EmElementSelector initialise for " << material->GetName() << G4endl;
97  if(0 == nElmMinusOne || cut == cutEnergy) { return; }
98 
99  cutEnergy = cut;
100  //G4cout << "cut(keV)= " << cut/keV << G4endl;
101  G4double cross;
102 
103  const G4double* theAtomNumDensityVector = material->GetVecNbOfAtomsPerVolume();
104 
105  // loop over bins
106  for(G4int j=0; j<=nbins; ++j) {
107  G4double e = (xSections[0])->Energy(j);
108  model->SetupForMaterial(part, material, e);
109  cross = 0.0;
110  //G4cout << "j= " << j << " e(MeV)= " << e/MeV << G4endl;
111  for (G4int i=0; i<=nElmMinusOne; ++i) {
112  cross += theAtomNumDensityVector[i]*
113  model->ComputeCrossSectionPerAtom(part, (*theElementVector)[i], e,
114  cutEnergy, e);
115  xSections[i]->PutValue(j, cross);
116  }
117  }
118 
119  // xSections start from null, so use probabilities from the next bin
120  if(0.0 == (*xSections[nElmMinusOne])[0]) {
121  for (G4int i=0; i<=nElmMinusOne; ++i) {
122  xSections[i]->PutValue(0, (*xSections[i])[1]);
123  }
124  }
125  // xSections ends with null, so use probabilities from the previous bin
126  if(0.0 == (*xSections[nElmMinusOne])[nbins]) {
127  for (G4int i=0; i<=nElmMinusOne; ++i) {
128  xSections[i]->PutValue(nbins, (*xSections[i])[nbins-1]);
129  }
130  }
131  // perform normalization
132  for(G4int j=0; j<=nbins; ++j) {
133  cross = (*xSections[nElmMinusOne])[j];
134  // only for positive X-section
135  if(cross > 0.0) {
136  for (G4int i=0; i<nElmMinusOne; ++i) {
137  G4double x = (*xSections[i])[j]/cross;
138  xSections[i]->PutValue(j, x);
139  }
140  }
141  }
142  //G4cout << "======== G4EmElementSelector for the " << model->GetName();
143 }
144 
145 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
146 
148 {
149  G4cout << "======== G4EmElementSelector for the " << model->GetName();
150  if(part) G4cout << " and " << part->GetParticleName();
151  G4cout << " for " << material->GetName() << " ========" << G4endl;
152  if(0 < nElmMinusOne) {
153  for(G4int i=0; i<nElmMinusOne; i++) {
154  G4cout << " " << (*theElementVector)[i]->GetName() << " : " << G4endl;
155  G4cout << *(xSections[i]) << G4endl;
156  }
157  }
158  G4cout << "Last Element in element vector "
159  << (*theElementVector)[nElmMinusOne]->GetName()
160  << G4endl;
161  G4cout << G4endl;
162 }
163 
164 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
165 
166