Gabriele Cosmo
130 lines
3.9 KiB
Plaintext
130 lines
3.9 KiB
Plaintext
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4LowEnergyBremsstrahlung.icc,v 1.13 2000/04/19 13:20:53 lefebure Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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//
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// ---------------------------------------------------------------
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// GEANT 4 class inlined methods file
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//
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// For information related to this code contact:
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// CERN, IT Division, ASD group
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// ------------ G4LowEnergyBremsstrahlung physics process ---------
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// by A.Forti 1999/03/27
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//
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// 18.04.2000 V.Lefebure
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// - First implementation of continuous energy loss.
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// - Return an infinite MeanfreePath when cross-section = 0.
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// ***************************************************************
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#include "G4Gamma.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4bool G4LowEnergyBremsstrahlung::IsApplicable(
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const G4ParticleDefinition& particle)
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{
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return( (&particle == G4Electron::Electron())
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/////////////||(&particle == G4Positron::Positron())
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);
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}
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inline G4double G4LowEnergyBremsstrahlung::GetMeanFreePath(const G4Track& track,
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G4double,
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G4ForceCondition*)
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// gives the MeanFreePath in GEANT4 internal units
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{
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const G4DynamicParticle* aDynamicParticle = track.GetDynamicParticle();
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G4double KineticEnergy = aDynamicParticle->GetKineticEnergy();
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G4Material* aMaterial = track.GetMaterial();
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const G4ElementVector* theElementVector = aMaterial->GetElementVector();
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const G4double* theAtomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
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const G4int NumberOfElements = aMaterial->GetNumberOfElements() ;
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G4double* CutInKineticEnergy = G4Gamma::Gamma()->GetCutsInEnergy() ;
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G4double Threshold = CutInKineticEnergy[aMaterial->GetIndex()] ;
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G4double MeanFreePath;
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G4bool isOutRange ;
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if (KineticEnergy < LowestKineticEnergy)
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////MeanFreePath = DBL_MIN;
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MeanFreePath = DBL_MAX;
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else {
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if (KineticEnergy > HighestKineticEnergy) KineticEnergy = 0.99*HighestKineticEnergy ;
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///MeanFreePath = util.DataLogInterpolation(KineticEnergy, aMaterial->GetIndex(), theMeanFreePathTable);
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/// MeanFreePath = (*theMeanFreePathTable)(aMaterial->GetIndex())->
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//// GetValue( KineticEnergy, isOutRange );
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G4double SIGMA = 0.;
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G4int iel;
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for (iel=0; iel<NumberOfElements; iel++ ){
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SIGMA += theAtomicNumDensityVector[iel]*
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GetCrossSectionWithCut( (*theElementVector)(iel)->GetZ(),
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KineticEnergy,
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Threshold);
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}
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MeanFreePath = SIGMA > DBL_MIN ? 1./SIGMA : DBL_MAX;
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}
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return MeanFreePath;
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}
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inline G4double G4LowEnergyBremsstrahlung::ComputeA(const G4int AtomicNumber,const G4double ElectronKinEnergy){
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G4double aVal;
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G4FirstLevel* oneAtomCoeff = (*ATable)[AtomicNumber-1];
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G4Data* ElectEnVec = (*oneAtomCoeff)[0];
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G4Data* AValueVec = (*oneAtomCoeff)[1];
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aVal = util.DataLogInterpolation(ElectronKinEnergy, (*ElectEnVec), (*AValueVec));
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if(AtomicNumber > 99){
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aVal = 0;
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}
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return aVal;
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}
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inline G4double G4LowEnergyBremsstrahlung::ComputeB(const G4int AtomicNumber,const G4double ElectronKinEnergy){
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G4double bVal;
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G4double constTerm = (*(*BTable)[0])[AtomicNumber-1];
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G4double linearTerm = (*(*BTable)[1])[AtomicNumber-1];
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G4double logElectEn = log10(ElectronKinEnergy);
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if(logElectEn > -5 && logElectEn < (-constTerm/linearTerm)){
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bVal = linearTerm*logElectEn+constTerm;
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}
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else{
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bVal = 0;
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}
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if(AtomicNumber > 99){
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bVal = 0;
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}
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return bVal;
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}
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