geant4/source/processes/electromagnetic/standard/include/G4PAIonisation.icc

// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
//
// 
// ---------------------------------------------------------------
//      GEANT 4 class inlined methods file 
//
//      For information related to this code contact:
//      CERN, IT Division, ASD group
//      ------------ G4PAIonisation physics process ------------
//                  by Laszlo Urban, 30 May 1997
// ***************************************************************
// It is the first implementation of the NEW IONISATION PROCESS.               
// It calculates the ionisation of charged hadrons.
// ***************************************************************
// corrected by L.Urban on 24/09/97
// 06.01.00 V.Grichine, modifications in GetConstraints and GetMenaFreePath
// 11.07.00 V.Grichine, modifications in GetMeanFreePath
// 12.07.00 V.Grichinw, GetFreePath and GetdEdx were added


////////////////////////////////////////////////////////////////////
//
//

inline G4double
 G4PAIonisation::GetConstraints(const G4DynamicParticle *aParticle,
                                              G4Material *aMaterial    ) 
{  
  G4int index = aMaterial->GetIndex() ;

//  G4cout<<"G4PAIonisation::GetConstraints is called"<<G4endl ;

  if(index != fMatIndex)
  {
    return DBL_MAX ;
  } 
  else
  {
    if(aMaterial->GetState() == kStateGas) 
    {
      return 100*mm ;
    }
    else
    {
      return 0.1*mm ;
    }
  }
}



//////////////////////////////////////////////////////////////////////////
//
//

inline G4double 
G4PAIonisation::GetContinuousStepLimit( const G4Track& track ,
                                              G4double ,
                                              G4double currentMinimumStep ,
                                              G4double&                     )
{
 
  G4double Step =
    GetConstraints(track.GetDynamicParticle(),track.GetMaterial()) ;

  if( (Step > 0.0) && (Step < currentMinimumStep) ) currentMinimumStep = Step ;

  return Step ;
}

/////////////////////////////////////////////////////////////////////////
//
//

inline G4double G4PAIonisation::
GetMeanFreePath( const G4Track&          trackData,
                       G4double          previousStepSize,
                       G4ForceCondition* condition         ) 
{
// G4cout<<"G4PAIonisation::GetMeanFreePath is called"<<G4endl ;

  G4int iTkin, iPlace ;
  G4double charge, charge2, massRatio, kinE, scaledE, meanFreePath ;
  G4double E1, E2, W, W1, W2, primaryIon ; 

 *condition = NotForced ;

  G4Material* aMaterial = trackData.GetMaterial() ;

  if( aMaterial->GetIndex() != fMatIndex )  meanFreePath = DBL_MAX ;
  else 
  {
    const G4DynamicParticle* aParticle = trackData.GetDynamicParticle() ;
    kinE = aParticle->GetKineticEnergy() ;
    charge = aParticle->GetDefinition()->GetPDGCharge() ;
    charge2 = charge*charge ;
    massRatio = proton_mass_c2/aParticle->GetDefinition()->GetPDGMass() ;
    scaledE = kinE*massRatio ;

    for(iTkin=0;iTkin<G4PAIonisation::GetBinNumber();iTkin++)
    {
      if(scaledE < fProtonEnergyVector->GetLowEdgeEnergy(iTkin)) // <= ?
      {
        break ;
      } 
    }
    iPlace = iTkin - 1 ; 

    if(iTkin == G4PAIonisation::GetBinNumber()) // Fermi plato, try from left
    {
      meanFreePath = 1.0/(*(*fPAItransferBank)(iPlace))(0)/charge2 ;
    }
    else
    {
      if(iTkin == 0) // Tkin is too small, trying from right only
      {
        meanFreePath = 1.0/(*(*fPAItransferBank)(iPlace+1))(0)/charge2 ;
      }
      else
      {
        E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
        E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin)     ;
        W  = 1.0/(E2 - E1) ;
        W1 = (E2 - scaledE)*W ;
        W2 = (scaledE - E1)*W ;
        primaryIon = (*(*fPAItransferBank)(iPlace  ))(0)*W1 + 
                     (*(*fPAItransferBank)(iPlace+1))(0)*W2    ;
        meanFreePath = 1.0/primaryIon/charge2 ;
      }
    }
    // meanFreePath = DBL_MAX ;
  }
  return meanFreePath ;
}

/////////////////////////////////////////////////////////////////////////
//
//

inline G4double G4PAIonisation::
GetFreePath( G4double scaledTkin, G4double charge2 ) 
{
// G4cout<<"G4PAIonisation::GetFreePath is called"<<G4endl ;

  G4int iTkin, iPlace ;
  G4double meanFreePath ;
  G4double E1, E2, W, W1, W2, primaryIon ; 

  for( iTkin = 0 ; iTkin < G4PAIonisation::GetBinNumber() ; iTkin++ )
  {
    if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin))  break ; 
  }
  iPlace = iTkin - 1 ; 

  if(iTkin == G4PAIonisation::GetBinNumber()) // Fermi plato, try from left
  {
      meanFreePath = 1.0/(*(*fPAItransferBank)(iPlace))(0)/charge2 ;
  }
  else
  {
    if(iTkin == 0) // Tkin is too small, trying from right only
    {
        meanFreePath = 1.0/(*(*fPAItransferBank)(iPlace+1))(0)/charge2 ;
    }
    else
    {
      E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
      E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin)     ;
      W  = 1.0/(E2 - E1) ;
      W1 = (E2 - scaledTkin)*W ;
      W2 = (scaledTkin - E1)*W ;
      primaryIon = (*(*fPAItransferBank)(iPlace  ))(0)*W1 + 
                     (*(*fPAItransferBank)(iPlace+1))(0)*W2    ;
      meanFreePath = 1.0/primaryIon/charge2 ;
    }
  }
  // meanFreePath = DBL_MAX ;
  
  return meanFreePath ;
}

/////////////////////////////////////////////////////////////////////////
//
//

inline G4double G4PAIonisation::
GetdEdx( G4double scaledTkin, G4double charge2 ) 
{
// G4cout<<"G4PAIonisation::GetdEdx is called"<<G4endl ;

  G4int iTkin, iPlace ;
  G4double dEdx ;
  G4double E1, E2, W, W1, W2 ; 

  for( iTkin = 0 ; iTkin < G4PAIonisation::GetBinNumber() ; iTkin++ )
  {
    if(scaledTkin < fProtonEnergyVector->GetLowEdgeEnergy(iTkin))  break ; 
  }
  iPlace = iTkin - 1 ; 

  if(iTkin == G4PAIonisation::GetBinNumber()) // Fermi plato, try from left
  {
      dEdx = (*(*theLossTable)(iPlace))(0)*charge2 ;
  }
  else
  {
    if(iTkin == 0) // Tkin is too small, trying from right only
    {
        dEdx = (*(*theLossTable)(iPlace+1))(0)*charge2 ;
    }
    else
    {
      E1 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; 
      E2 = fProtonEnergyVector->GetLowEdgeEnergy(iTkin)     ;
      W  = 1.0/(E2 - E1) ;
      W1 = (E2 - scaledTkin)*W ;
      W2 = (scaledTkin - E1)*W ;
      dEdx = (*(*theLossTable)(iPlace))(0)*W1 + (*(*theLossTable)(iPlace+1))(0)*W2;
      dEdx *= charge2 ;
    }
  }  
  return dEdx ;
}

//////////////////////////////////////////////////////////////////////
//
//

inline G4bool G4PAIonisation::IsApplicable(
                            const G4ParticleDefinition& particle)
{
   return(particle.GetPDGCharge() != 0.);
}

//////////////////////////////////////////////////////////////////////////
//
//         

inline
G4double G4PAIonisation::GetSandiaPhotoAbsCof(G4int i, G4int j) const 
{
   if(i < 0 || i >= fSandiaIntervalNumber || j < 0 || j > 4)
   {
      G4Exception("Invalid arguments in G4Material::GetSandiaPhotoAbsCof") ;
   }
   return fSandiaPhotoAbsCof[i][j] ;
}


//
//
/////////////////////////////////////////////////////////////////////////