G4NeutronHPorLElastic.cc

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//
// 05-11-21 NeutronHP or Low Energy Parameterization Models 
//          Implemented by T. Koi (SLAC/SCCS)
//          If NeutronHP data do not available for an element, then Low Energy 
//          Parameterization models handle the interactions of the element.
// 080319 Compilation warnings - gcc-4.3.0 fix by T. Koi
//

// neutron_hp -- source file
// J.P. Wellisch, Nov-1996
// A prototype of the low energy neutron transport model.
//
#include "G4NeutronHPorLElastic.hh"
#include "G4SystemOfUnits.hh"
#include "G4NeutronHPElasticFS.hh"

G4NeutronHPorLElastic::G4NeutronHPorLElastic()
  :G4HadronicInteraction("NeutronHPorLElastic")
{
   overrideSuspension = false;
   G4NeutronHPElasticFS * theFS = new G4NeutronHPElasticFS;
   if(!getenv("G4NEUTRONHPDATA")) 
       throw G4HadronicException(__FILE__, __LINE__, "Please setenv G4NEUTRONHPDATA to point to the neutron cross-section files.");
   dirName = getenv("G4NEUTRONHPDATA");
   G4String tString = "/Elastic/";
   dirName = dirName + tString;
//    G4cout <<"G4NeutronHPorLElastic::G4NeutronHPorLElastic testit "<<dirName<<G4endl;
   numEle = G4Element::GetNumberOfElements();
   theElastic = new G4NeutronHPChannel[numEle];
   unavailable_elements.clear();
   for (G4int i=0; i<numEle; i++)
   {
      theElastic[i].Init((*(G4Element::GetElementTable()))[i], dirName);
      //while(!theElastic[i].Register(theFS));
      try { while(!theElastic[i].Register(theFS)) ; }
      catch ( G4HadronicException )
      {
          unavailable_elements.insert ( (*(G4Element::GetElementTable()))[i]->GetName() ); 
      }
   }
   delete theFS;
   SetMinEnergy(0.*eV);
   SetMaxEnergy(20.*MeV);
   if ( unavailable_elements.size() > 0 ) 
   {
      std::set< G4String>::iterator it;
      G4cout << "HP Elastic data are not available for thess  elements "<< G4endl;
      for ( it = unavailable_elements.begin() ; it != unavailable_elements.end() ; it++ )
         G4cout << *it << G4endl;
      G4cout << "Low Energy Parameterization Models will be used."<< G4endl;
   }

   createXSectionDataSet();
}
  
G4NeutronHPorLElastic::~G4NeutronHPorLElastic()
{
   delete [] theElastic;
   delete theDataSet; 
}
  
#include "G4NeutronHPThermalBoost.hh"
  
G4HadFinalState * G4NeutronHPorLElastic::ApplyYourself(const G4HadProjectile& aTrack, G4Nucleus& )
{
   const G4Material * theMaterial = aTrack.GetMaterial();
   G4int n = theMaterial->GetNumberOfElements();
   G4int index = theMaterial->GetElement(0)->GetIndex();
   if(n!=1)
   {
      G4int i;
      xSec = new G4double[n];
      G4double sum=0;
      const G4double * NumAtomsPerVolume = theMaterial->GetVecNbOfAtomsPerVolume();
      G4double rWeight;    
      G4NeutronHPThermalBoost aThermalE;
      for (i=0; i<n; i++)
      {
        index = theMaterial->GetElement(i)->GetIndex();
        rWeight = NumAtomsPerVolume[i];
        G4double x = aThermalE.GetThermalEnergy(aTrack, theMaterial->GetElement(i), theMaterial->GetTemperature());

        //xSec[i] = theElastic[index].GetXsec(aThermalE.GetThermalEnergy(aTrack,
        //                                                                   theMaterial->GetElement(i),
        //                                                                   theMaterial->GetTemperature()));
        xSec[i] = theElastic[index].GetXsec(x);

        xSec[i] *= rWeight;
        sum+=xSec[i];
      }
      G4double random = G4UniformRand();
      G4double running = 0;
      for (i=0; i<n; i++)
      {
        running += xSec[i];
        index = theMaterial->GetElement(i)->GetIndex();
        if(random<=running/sum) break;
      }
      delete [] xSec;
      // it is element-wise initialised.
    }
    G4HadFinalState* finalState = theElastic[index].ApplyYourself(aTrack);
    if (overrideSuspension) finalState->SetStatusChange(isAlive);
    return finalState;
}



G4bool G4NeutronHPorLElastic::IsThisElementOK( G4String name )
{
   if ( unavailable_elements.find( name ) == unavailable_elements.end() ) 
      return TRUE;
   else 
      return FALSE; 
}



void G4NeutronHPorLElastic::createXSectionDataSet()
{
   theDataSet = new G4NeutronHPorLElasticData ( theElastic , &unavailable_elements );
}

const std::pair<G4double, G4double> G4NeutronHPorLElastic::GetFatalEnergyCheckLevels() const
{
   //return std::pair<G4double, G4double>(10*perCent,10*GeV);
   return std::pair<G4double, G4double>(10*perCent,DBL_MAX);
}

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