G4NeutronHPInelasticData Class Reference

#include <G4NeutronHPInelasticData.hh>

Inheritance diagram for G4NeutronHPInelasticData:

Public Member Functions
	G4NeutronHPInelasticData ()
	~G4NeutronHPInelasticData ()
G4bool	IsIsoApplicable (const G4DynamicParticle *, G4int, G4int, const G4Element *, const G4Material *)
G4double	GetIsoCrossSection (const G4DynamicParticle *, G4int, G4int, const G4Isotope *, const G4Element *, const G4Material *)
G4double	GetCrossSection (const G4DynamicParticle *, const G4Element *, G4double aT)
void	BuildPhysicsTable (const G4ParticleDefinition &)
void	DumpPhysicsTable (const G4ParticleDefinition &)
void	IgnoreOnFlightDopplerBroadening ()
void	EnableOnFlightDopplerBroadening ()
Public Member Functions inherited from G4VCrossSectionDataSet
	G4VCrossSectionDataSet (const G4String &nam="")
virtual	~G4VCrossSectionDataSet ()
virtual G4bool	IsElementApplicable (const G4DynamicParticle *, G4int Z, const G4Material *mat=0)
virtual G4bool	IsIsoApplicable (const G4DynamicParticle *, G4int Z, G4int A, const G4Element *elm=0, const G4Material *mat=0)
G4double	GetCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=0)
G4double	ComputeCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=0)
virtual G4double	GetElementCrossSection (const G4DynamicParticle *, G4int Z, const G4Material *mat=0)
virtual G4double	GetIsoCrossSection (const G4DynamicParticle *, G4int Z, G4int A, const G4Isotope *iso=0, const G4Element *elm=0, const G4Material *mat=0)
virtual G4Isotope *	SelectIsotope (const G4Element *, G4double kinEnergy)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	DumpPhysicsTable (const G4ParticleDefinition &)
virtual void	CrossSectionDescription (std::ostream &) const
void	SetVerboseLevel (G4int value)
G4double	GetMinKinEnergy () const
void	SetMinKinEnergy (G4double value)
G4double	GetMaxKinEnergy () const
void	SetMaxKinEnergy (G4double value)
const G4String &	GetName () const

Additional Inherited Members
Protected Member Functions inherited from G4VCrossSectionDataSet
void	SetName (const G4String &)
Protected Attributes inherited from G4VCrossSectionDataSet
G4int	verboseLevel

Detailed Description

Definition at line 50 of file G4NeutronHPInelasticData.hh.

Constructor & Destructor Documentation

G4NeutronHPInelasticData()

G4NeutronHPInelasticData::G4NeutronHPInelasticData

(

)

Definition at line 44 of file G4NeutronHPInelasticData.cc.

:G4VCrossSectionDataSet("NeutronHPInelasticXS")
{
 
   SetMinKinEnergy( 0*MeV );                                   
   SetMaxKinEnergy( 20*MeV );                                   
 
   ke_cache = 0.0;
   xs_cache = 0.0;
   element_cache = NULL;
   material_cache = NULL;
 
   onFlightDB = true;
   theCrossSections = 0;
   BuildPhysicsTable(*G4Neutron::Neutron());
}

~G4NeutronHPInelasticData()

G4NeutronHPInelasticData::~G4NeutronHPInelasticData

(

)

Definition at line 61 of file G4NeutronHPInelasticData.cc.

{
   if ( theCrossSections != 0 ) theCrossSections->clearAndDestroy(); 
   delete theCrossSections;
}

Member Function Documentation

BuildPhysicsTable()

void G4NeutronHPInelasticData::BuildPhysicsTable ( const G4ParticleDefinition &  aP )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 107 of file G4NeutronHPInelasticData.cc.

{
  if(&aP!=G4Neutron::Neutron()) 
     throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!");  
 
//080428
   if ( getenv( "G4NEUTRONHP_NEGLECT_DOPPLER" ) ) 
   {
      G4cout << "Find environment variable of \"G4NEUTRONHP_NEGLECT_DOPPLER\"." << G4endl;
      G4cout << "On the fly Doppler broadening will be neglect in the cross section calculation of inelastic scattering of neutrons (<20MeV)." << G4endl;
      onFlightDB = false;
   }    
 
  size_t numberOfElements = G4Element::GetNumberOfElements();
//  theCrossSections = new G4PhysicsTable( numberOfElements );
// TKDB
   //if ( theCrossSections == 0 )
   //{ theCrossSections = new G4PhysicsTable( numberOfElements ); }
   if ( theCrossSections == NULL ) 
      theCrossSections = new G4PhysicsTable( numberOfElements );
   else
      theCrossSections->clearAndDestroy();
 
  // make a PhysicsVector for each element
 
  static const G4ElementTable *theElementTable = G4Element::GetElementTable();
  for( size_t i=0; i<numberOfElements; ++i )
  {
     G4PhysicsVector* physVec = G4NeutronHPData::
      Instance()->MakePhysicsVector((*theElementTable)[i], this);
     theCrossSections->push_back(physVec);
  }
}

Referenced by G4NeutronHPInelasticData().

DumpPhysicsTable()

void G4NeutronHPInelasticData::DumpPhysicsTable ( const G4ParticleDefinition &  aP )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 141 of file G4NeutronHPInelasticData.cc.

{
  if(&aP!=G4Neutron::Neutron()) 
     throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!");  
 
//
// Dump element based cross section
// range 10e-5 eV to 20 MeV
// 10 point per decade
// in barn
//
 
   G4cout << G4endl;
   G4cout << G4endl;
   G4cout << "Inelastic Cross Section of Neutron HP"<< G4endl;
   G4cout << "(Pointwise cross-section at 0 Kelvin.)" << G4endl;
   G4cout << G4endl;
   G4cout << "Name of Element" << G4endl;
   G4cout << "Energy[eV]  XS[barn]" << G4endl;
   G4cout << G4endl;
 
   size_t numberOfElements = G4Element::GetNumberOfElements();
   static const G4ElementTable *theElementTable = G4Element::GetElementTable();
 
   for ( size_t i = 0 ; i < numberOfElements ; ++i )
   {
 
      G4cout << (*theElementTable)[i]->GetName() << G4endl;
 
      G4int ie = 0;
 
      for ( ie = 0 ; ie < 130 ; ie++ )
      {
         G4double eKinetic = 1.0e-5 * std::pow ( 10.0 , ie/10.0 ) *eV;
         G4bool outOfRange = false;
 
         if ( eKinetic < 20*MeV )
         {
            G4cout << eKinetic/eV << " " << (*((*theCrossSections)(i))).GetValue(eKinetic, outOfRange)/barn << G4endl;
         }
 
      }
 
      G4cout << G4endl;
   }
 
  //G4cout << "G4NeutronHPInelasticData::DumpPhysicsTable still to be implemented"<<G4endl;
}

EnableOnFlightDopplerBroadening()

void G4NeutronHPInelasticData::EnableOnFlightDopplerBroadening ( )

inline

Definition at line 82 of file G4NeutronHPInelasticData.hh.

{ onFlightDB = true; };

GetCrossSection()

G4double G4NeutronHPInelasticData::GetCrossSection	(	const G4DynamicParticle *	aP,
		const G4Element *	anE,
		G4double	aT
	)

Definition at line 192 of file G4NeutronHPInelasticData.cc.

{
  G4double result = 0;
  G4bool outOfRange;
  G4int index = anE->GetIndex();
 
  // prepare neutron
  G4double eKinetic = aP->GetKineticEnergy();
 
  // T. K. 
//if ( getenv( "G4NEUTRONHP_NEGLECT_DOPPLER" ) )
//080428
  if ( !onFlightDB )
  {
     G4double factor = 1.0;
     if ( eKinetic < aT * k_Boltzmann ) 
     {
        // below 0.1 eV neutrons 
        // Have to do some, but now just igonre.   
        // Will take care after performance check.  
        // factor = factor * targetV;
     }
     return ( (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) )* factor; 
  }   
 
  G4ReactionProduct theNeutron( aP->GetDefinition() );
  theNeutron.SetMomentum( aP->GetMomentum() );
  theNeutron.SetKineticEnergy( eKinetic );
 
  // prepare thermal nucleus
  G4Nucleus aNuc;
  G4double eps = 0.0001;
  G4double theA = anE->GetN();
  G4double theZ = anE->GetZ();
  G4double eleMass; 
  eleMass = ( G4NucleiProperties::GetNuclearMass(static_cast<G4int>(theA+eps), static_cast<G4int>(theZ+eps))
         ) / G4Neutron::Neutron()->GetPDGMass();
  
  G4ReactionProduct boosted;
  G4double aXsection;
  
  // MC integration loop
  G4int counter = 0;
  G4int failCount = 0;
  G4double buffer = 0;
  G4int size = G4int(std::max(10., aT/60*kelvin));
  G4ThreeVector neutronVelocity = 1./G4Neutron::Neutron()->GetPDGMass()*theNeutron.GetMomentum();
  G4double neutronVMag = neutronVelocity.mag();
 
  while(counter == 0 || std::abs(buffer-result/std::max(1,counter)) > 0.01*buffer)
  {
    if(counter) buffer = result/counter;
    while (counter<size)
    {
      counter ++;
      G4ReactionProduct aThermalNuc = aNuc.GetThermalNucleus(eleMass, aT);
      boosted.Lorentz(theNeutron, aThermalNuc);
      G4double theEkin = boosted.GetKineticEnergy();
      aXsection = (*((*theCrossSections)(index))).GetValue(theEkin, outOfRange);
      if(aXsection <0) 
      {
        if(failCount<1000)
    {
      failCount++;
      counter--;
      continue;
    }
    else
    {
      aXsection = 0;
    }
      }
      // velocity correction.
      G4ThreeVector targetVelocity = 1./aThermalNuc.GetMass()*aThermalNuc.GetMomentum();
      aXsection *= (targetVelocity-neutronVelocity).mag()/neutronVMag;
      result += aXsection;
    }
    size += size;
  }
  result /= counter;
/*
  // Checking impact of  G4NEUTRONHP_NEGLECT_DOPPLER
  G4cout << " result " << result << " " 
         << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) << " " 
         << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) /result << G4endl;
*/
  return result;
}

Referenced by GetIsoCrossSection().

GetIsoCrossSection()

G4double G4NeutronHPInelasticData::GetIsoCrossSection ( const G4DynamicParticle *  dp, G4int  , G4int  , const G4Isotope *  , const G4Element *  element, const G4Material *  material  )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 80 of file G4NeutronHPInelasticData.cc.

{
   if ( dp->GetKineticEnergy() == ke_cache && element == element_cache &&  material == material_cache ) return xs_cache;
 
   ke_cache = dp->GetKineticEnergy();
   element_cache = element;
   material_cache = material;
   G4double xs = GetCrossSection( dp , element , material->GetTemperature() );
   xs_cache = xs;
   return xs;
   //return GetCrossSection( dp , element , material->GetTemperature() );
}

IgnoreOnFlightDopplerBroadening()

void G4NeutronHPInelasticData::IgnoreOnFlightDopplerBroadening ( )

inline

Definition at line 81 of file G4NeutronHPInelasticData.hh.

{ onFlightDB = false; };

IsIsoApplicable()

G4bool G4NeutronHPInelasticData::IsIsoApplicable ( const G4DynamicParticle *  dp, G4int  , G4int  , const G4Element *  , const G4Material *    )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 67 of file G4NeutronHPInelasticData.cc.

{
   G4double eKin = dp->GetKineticEnergy();
   if ( eKin > GetMaxKinEnergy() 
     || eKin < GetMinKinEnergy() 
     || dp->GetDefinition() != G4Neutron::Neutron() ) return false;                                   
 
   return true;
}

---

The documentation for this class was generated from the following files:

• G4NeutronHPInelasticData.hh
• G4NeutronHPInelasticData.cc