G4ParticleHPElastic.cc

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// neutron_hp -- source file
// J.P. Wellisch, Nov-1996
// A prototype of the low energy neutron transport model.
//
// 070523 bug fix for G4FPE_DEBUG on by A. Howard ( and T. Koi)
// 080319 Compilation warnings - gcc-4.3.0 fix by T. Koi
//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#include "G4ParticleHPElastic.hh"
 
#include "G4ParticleHPElasticFS.hh"
#include "G4ParticleHPManager.hh"
#include "G4ParticleHPThermalBoost.hh"
#include "G4SystemOfUnits.hh"
#include "G4Threading.hh"
 
G4ParticleHPElastic::G4ParticleHPElastic() : G4HadronicInteraction("NeutronHPElastic")
{
  overrideSuspension = false;
  SetMinEnergy(0. * eV);
  SetMaxEnergy(20. * MeV);
}
 
G4ParticleHPElastic::~G4ParticleHPElastic()
{
  // the vectror is shared among threads, only master deletes
  if (!G4Threading::IsWorkerThread()) {
    if (theElastic != nullptr) {
      for (auto it = theElastic->cbegin(); it != theElastic->cend(); ++it) {
        delete *it;
      }
      theElastic->clear();
    }
  }
}
 
G4HadFinalState* G4ParticleHPElastic::ApplyYourself(const G4HadProjectile& aTrack,
                                                    G4Nucleus& aNucleus)
{
  return this->ApplyYourself(aTrack, aNucleus, false);
}
 
//--------------------------------------------------------
// New method added by L. Thulliez (CEA-Saclay) 2021/05/04
//--------------------------------------------------------
G4HadFinalState* G4ParticleHPElastic::ApplyYourself(const G4HadProjectile& aTrack,
                                                    G4Nucleus& aNucleus, G4bool isFromTSL)
{
  G4ParticleHPManager::GetInstance()->OpenReactionWhiteBoard();
  const G4Material* theMaterial = aTrack.GetMaterial();
  auto n = (G4int)theMaterial->GetNumberOfElements();
  std::size_t index = theMaterial->GetElement(0)->GetIndex();
 
  if (!isFromTSL) {
    if (n != 1) {
      G4int i;
      auto xSec = new G4double[n];
      G4double sum = 0;
      const G4double* NumAtomsPerVolume = theMaterial->GetVecNbOfAtomsPerVolume();
      G4double rWeight;
      G4ParticleHPThermalBoost aThermalE;
      for (i = 0; i < n; ++i) {
        index = theMaterial->GetElement(i)->GetIndex();
        rWeight = NumAtomsPerVolume[i];
        xSec[i] = ((*theElastic)[index])
                    ->GetXsec(aThermalE.GetThermalEnergy(aTrack, theMaterial->GetElement(i),
                                                         theMaterial->GetTemperature()));
        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 (sum == 0 || random <= running / sum) break;
      }
      delete[] xSec;
    }
  }
  else {
    G4int i;
    if (n != 1) {
      for (i = 0; i < n; ++i) {
        if (aNucleus.GetZ_asInt() == (G4int)(theMaterial->GetElement(i)->GetZ())) {
          index = theMaterial->GetElement(i)->GetIndex();
        }
      }
    }
  }
 
  // The boolean "true", as last argument, specifies to G4ParticleHPChannel::ApplyYourself
  // that it is an elastic channel: this is needed for the special DBRC treatment.
  G4HadFinalState* finalState = ((*theElastic)[index])->ApplyYourself(aTrack, -1, true);
 
  if (overrideSuspension) finalState->SetStatusChange(isAlive);
 
  // Overwrite target parameters
  aNucleus.SetParameters(G4ParticleHPManager::GetInstance()->GetReactionWhiteBoard()->GetTargA(),
                         G4ParticleHPManager::GetInstance()->GetReactionWhiteBoard()->GetTargZ());
  const G4Element* target_element = (*G4Element::GetElementTable())[index];
  const G4Isotope* target_isotope = nullptr;
  auto iele = (G4int)target_element->GetNumberOfIsotopes();
  for (G4int j = 0; j != iele; ++j) {
    target_isotope = target_element->GetIsotope(j);
    if (target_isotope->GetN()
        == G4ParticleHPManager::GetInstance()->GetReactionWhiteBoard()->GetTargA())
      break;
  }
  aNucleus.SetIsotope(target_isotope);
 
  G4ParticleHPManager::GetInstance()->CloseReactionWhiteBoard();
  return finalState;
}
 
const std::pair<G4double, G4double> G4ParticleHPElastic::GetFatalEnergyCheckLevels() const
{
  // max energy non-conservation is mass of heavy nucleus
  return std::pair<G4double, G4double>(10.0 * perCent, 350.0 * CLHEP::GeV);
}
 
G4int G4ParticleHPElastic::GetVerboseLevel() const
{
  return G4ParticleHPManager::GetInstance()->GetVerboseLevel();
}
 
void G4ParticleHPElastic::SetVerboseLevel(G4int newValue)
{
  G4ParticleHPManager::GetInstance()->SetVerboseLevel(newValue);
}
 
void G4ParticleHPElastic::BuildPhysicsTable(const G4ParticleDefinition&)
{
  G4ParticleHPManager* hpmanager = G4ParticleHPManager::GetInstance();
 
  theElastic = hpmanager->GetElasticFinalStates();
 
  if (G4Threading::IsMasterThread()) {
    if (theElastic == nullptr) theElastic = new std::vector<G4ParticleHPChannel*>;
 
    if (numEle == (G4int)G4Element::GetNumberOfElements()) return;
 
    if (theElastic->size() == G4Element::GetNumberOfElements()) {
      numEle = (G4int)G4Element::GetNumberOfElements();
      return;
    }
 
    auto theFS = new G4ParticleHPElasticFS;
    if (G4FindDataDir("G4NEUTRONHPDATA") == nullptr)
      throw G4HadronicException(
        __FILE__, __LINE__,
        "Please setenv G4NEUTRONHPDATA to point to the neutron cross-section files.");
    dirName = G4FindDataDir("G4NEUTRONHPDATA");
    G4String tString = "/Elastic";
    dirName = dirName + tString;
    for (G4int i = numEle; i < (G4int)G4Element::GetNumberOfElements(); ++i) {
      theElastic->push_back(new G4ParticleHPChannel);
      ((*theElastic)[i])->Init((*(G4Element::GetElementTable()))[i], dirName);
      // while(!((*theElastic)[i])->Register(theFS)) ;
      ((*theElastic)[i])->Register(theFS);
    }
    delete theFS;
    hpmanager->RegisterElasticFinalStates(theElastic);
  }
  numEle = (G4int)G4Element::GetNumberOfElements();
}
 
void G4ParticleHPElastic::ModelDescription(std::ostream& outFile) const
{
  outFile << "High Precision model based on Evaluated Nuclear Data Files (ENDF) for inelastic "
             "reaction of neutrons below 20MeV\n";
}