G4EmElementSelector Class Reference

#include <G4EmElementSelector.hh>


Public Member Functions

 G4EmElementSelector (G4VEmModel *, const G4Material *, G4int bins, G4double emin, G4double emax, G4bool spline=true)
 ~G4EmElementSelector ()
void Initialise (const G4ParticleDefinition *, G4double cut=0.0)
void Dump (const G4ParticleDefinition *p=0)
const G4ElementSelectRandomAtom (G4double kineticEnergy)
const G4MaterialGetMaterial () const


Detailed Description

Definition at line 63 of file G4EmElementSelector.hh.


Constructor & Destructor Documentation

G4EmElementSelector::G4EmElementSelector ( G4VEmModel ,
const G4Material ,
G4int  bins,
G4double  emin,
G4double  emax,
G4bool  spline = true 
)

Definition at line 54 of file G4EmElementSelector.cc.

References G4Material::GetElementVector(), G4Material::GetNumberOfElements(), CLHEP::detail::n, and G4PhysicsVector::SetSpline().

00059                                                        :
00060   model(mod), material(mat), nbins(bins), cutEnergy(-1.0), 
00061   lowEnergy(emin), highEnergy(emax)
00062 {
00063   G4int n = material->GetNumberOfElements();
00064   nElmMinusOne = n - 1;
00065   theElementVector = material->GetElementVector();
00066   element = (*theElementVector)[0];
00067   if(nElmMinusOne > 0) {
00068     xSections.reserve(n);
00069     G4PhysicsLogVector* v0 = new G4PhysicsLogVector(lowEnergy,highEnergy,nbins);
00070     xSections.push_back(v0);
00071     v0->SetSpline(spline);
00072     for(G4int i=1; i<n; ++i) {
00073       G4PhysicsLogVector* v = new G4PhysicsLogVector(*v0);
00074       xSections.push_back(v);
00075     }
00076   }
00077   //G4cout << "G4EmElementSelector for " << mat->GetName() << " n= " << n << G4endl;
00078 }

G4EmElementSelector::~G4EmElementSelector (  ) 

Definition at line 82 of file G4EmElementSelector.cc.

00083 {
00084   if(nElmMinusOne > 0) {
00085     for(G4int i=0; i<=nElmMinusOne; ++i) {
00086       delete xSections[i];
00087     }
00088   }
00089 }


Member Function Documentation

void G4EmElementSelector::Dump ( const G4ParticleDefinition p = 0  ) 

Definition at line 147 of file G4EmElementSelector.cc.

References G4cout, G4endl, G4Material::GetName(), G4VEmModel::GetName(), and G4ParticleDefinition::GetParticleName().

00148 {
00149   G4cout << "======== G4EmElementSelector for the " << model->GetName();
00150   if(part) G4cout << " and " << part->GetParticleName();
00151   G4cout << " for " << material->GetName() << " ========" << G4endl;
00152   if(0 < nElmMinusOne) {
00153     for(G4int i=0; i<nElmMinusOne; i++) {
00154       G4cout << "      " << (*theElementVector)[i]->GetName() << " : " << G4endl;
00155       G4cout << *(xSections[i]) << G4endl;
00156     }
00157   }  
00158   G4cout << "Last Element in element vector " 
00159          << (*theElementVector)[nElmMinusOne]->GetName() 
00160          << G4endl;
00161   G4cout << G4endl;
00162 }

const G4Material * G4EmElementSelector::GetMaterial (  )  const [inline]

Definition at line 122 of file G4EmElementSelector.hh.

00123 {
00124   return material;
00125 }

void G4EmElementSelector::Initialise ( const G4ParticleDefinition ,
G4double  cut = 0.0 
)

Definition at line 93 of file G4EmElementSelector.cc.

References G4VEmModel::ComputeCrossSectionPerAtom(), G4Material::GetVecNbOfAtomsPerVolume(), and G4VEmModel::SetupForMaterial().

00095 {
00096   //G4cout << "G4EmElementSelector initialise for " << material->GetName() << G4endl;
00097   if(0 == nElmMinusOne || cut == cutEnergy) { return; }
00098 
00099   cutEnergy = cut;
00100   //G4cout << "cut(keV)= " << cut/keV << G4endl;
00101   G4double cross;
00102 
00103   const G4double* theAtomNumDensityVector = material->GetVecNbOfAtomsPerVolume();
00104 
00105   // loop over bins
00106   for(G4int j=0; j<=nbins; ++j) {
00107     G4double e = (xSections[0])->Energy(j);
00108     model->SetupForMaterial(part, material, e);
00109     cross = 0.0;
00110     //G4cout << "j= " << j << " e(MeV)= " << e/MeV << G4endl;
00111     for (G4int i=0; i<=nElmMinusOne; ++i) {
00112       cross += theAtomNumDensityVector[i]*      
00113         model->ComputeCrossSectionPerAtom(part, (*theElementVector)[i], e, 
00114                                           cutEnergy, e);
00115       xSections[i]->PutValue(j, cross);
00116     }
00117   }
00118 
00119   // xSections start from null, so use probabilities from the next bin
00120   if(0.0 == (*xSections[nElmMinusOne])[0]) {
00121     for (G4int i=0; i<=nElmMinusOne; ++i) {
00122       xSections[i]->PutValue(0, (*xSections[i])[1]);
00123     }
00124   }
00125   // xSections ends with null, so use probabilities from the previous bin
00126   if(0.0 == (*xSections[nElmMinusOne])[nbins]) {
00127     for (G4int i=0; i<=nElmMinusOne; ++i) {
00128       xSections[i]->PutValue(nbins, (*xSections[i])[nbins-1]);
00129     }
00130   }
00131   // perform normalization
00132   for(G4int j=0; j<=nbins; ++j) {
00133     cross = (*xSections[nElmMinusOne])[j];
00134     // only for positive X-section 
00135     if(cross > 0.0) {
00136       for (G4int i=0; i<nElmMinusOne; ++i) {
00137         G4double x = (*xSections[i])[j]/cross;
00138         xSections[i]->PutValue(j, x);
00139       }
00140     }
00141   }
00142   //G4cout << "======== G4EmElementSelector for the " << model->GetName();
00143 }

const G4Element * G4EmElementSelector::SelectRandomAtom ( G4double  kineticEnergy  )  [inline]

Definition at line 107 of file G4EmElementSelector.hh.

References G4UniformRand.

00108 {
00109   if (nElmMinusOne > 0) {
00110     G4double x = G4UniformRand();
00111     element = (*theElementVector)[nElmMinusOne];
00112     for(G4int i=0; i<nElmMinusOne; ++i) {
00113       if (x <= (xSections[i])->Value(e)) {
00114         element = (*theElementVector)[i];
00115         break;
00116       }
00117     }
00118   }
00119   return element;
00120 }


The documentation for this class was generated from the following files:
Generated on Mon May 27 17:51:52 2013 for Geant4 by  doxygen 1.4.7