G4NIELCalculator.cc

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//
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4NIELCalculator
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 30.05.2019
//
// Modifications:
//
// -------------------------------------------------------------

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#include "G4NIELCalculator.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"
#include "G4LossTableManager.hh"
#include "G4Material.hh"
#include "G4MaterialTable.hh"
#include "G4Step.hh"
#include "G4StepPoint.hh"
#include "G4VProcess.hh"
#include "G4Track.hh"
#include "Randomize.hh"
#include <vector>

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G4NIELCalculator::G4NIELCalculator(G4VEmModel* mod, G4int verb)
  : fModel(mod), fVerbose(verb)
{
  G4LossTableManager::Instance()->SetNIELCalculator(this);
  if(fVerbose > 0) {
    G4cout << "G4NIELCalculator: is created with the model <" 
           << fModel->GetName() << ">" << G4endl;
  }
}

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G4NIELCalculator::~G4NIELCalculator()
{}

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void G4NIELCalculator::AddEmModel(G4VEmModel* mod) 
{
  if(mod && mod != fModel) { 
    fModel = mod; 
    if(fVerbose > 0) {
      G4cout << "G4NIELCalculator: new model <" << fModel->GetName()
             << "> is added" << G4endl;
    }
  }
}

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void G4NIELCalculator::Initialise() 
{}

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G4double G4NIELCalculator::ComputeNIEL(const G4Step* step)
{
  G4double niel = 0.0;
  G4double T2 = step->GetPostStepPoint()->GetKineticEnergy();
  if(fModel && T2 > 0.) {
    const G4Track* track = step->GetTrack();
    const G4ParticleDefinition* part = track->GetParticleDefinition();
    G4double length = step->GetStepLength(); 

    if(length > 0.0 && part->GetPDGMass() > 100*CLHEP::MeV) {

      // primary
      G4double T1= step->GetPreStepPoint()->GetKineticEnergy();
      G4double T = 0.5*(T1 + T2);
      const G4MaterialCutsCouple* couple = 
  step->GetPreStepPoint()->GetMaterialCutsCouple(); 
      niel = length*fModel->ComputeDEDXPerVolume(couple->GetMaterial(),part,T);
      niel = std::min(niel, T1);
    }
  }
  return niel;
}

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G4double G4NIELCalculator::RecoilEnergy(const G4Step* step)
{
  G4double erec = 0.0;
  const std::vector<const G4Track*>* sec = step->GetSecondaryInCurrentStep(); 

  if(sec) {
    for(auto track : *sec) {
      const G4ParticleDefinition* part = track->GetParticleDefinition();
      if(part->IsGeneralIon()) {
        erec += track->GetKineticEnergy();
      }
    }
  }
  return erec;
}

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