G4FieldTrack.cc

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// $Id: G4FieldTrack.cc 81686 2014-06-04 14:44:57Z gcosmo $
//
// -------------------------------------------------------------------

#include "G4FieldTrack.hh"

std::ostream& operator<<( std::ostream& os, const G4FieldTrack& SixVec)
{
     const G4double *SixV = SixVec.SixVector;
     os << " ( ";
     os << " X= " << SixV[0] << " " << SixV[1] << " "
                  << SixV[2] << " ";  // Position
     os << " P= " << SixV[3] << " " << SixV[4] << " "
                  << SixV[5] << " ";  // Momentum
     os << " Pmag= "
        << G4ThreeVector(SixV[3], SixV[4], SixV[5]).mag(); // mom magnitude
     os << " Ekin= " << SixVec.fKineticEnergy ;
     os << " m0= " <<   SixVec.fRestMass_c2;
     os << " Pdir= " <<  SixVec.fMomentumDir.mag(); 
     os << " l= " <<    SixVec.GetCurveLength();
     os << " t_lab= " << SixVec.fLabTimeOfFlight; 
     os << " t_proper= " << SixVec.fProperTimeOfFlight ; 
     os << " ) ";
     return os;
}

G4FieldTrack::G4FieldTrack( const G4ThreeVector& pPosition, 
                                  G4double       LaboratoryTimeOfFlight,
                            const G4ThreeVector& pMomentumDirection,
                                  G4double       kineticEnergy,
                                  G4double       restMass_c2,
                                  G4double       charge, 
                            const G4ThreeVector& vecPolarization,
                                  G4double       magnetic_dipole_moment,
                                  G4double       curve_length,
                                  G4double       pdgSpin )
:  fDistanceAlongCurve(curve_length),
   fKineticEnergy(kineticEnergy),
   fRestMass_c2(restMass_c2),
   fLabTimeOfFlight(LaboratoryTimeOfFlight), 
   fProperTimeOfFlight(0.),
   // fMomentumDir(pMomentumDirection),
   fChargeState(  charge, magnetic_dipole_moment, pdgSpin ) 
   // fChargeState(  charge, magnetic_dipole_moment ) , 
   // fPDGSpin( pdgSpin )
{
  UpdateFourMomentum( kineticEnergy, pMomentumDirection ); 
      // Sets momentum direction as well.

  SetPosition( pPosition ); 

  SetPolarization( vecPolarization ); 
}

G4FieldTrack::G4FieldTrack( const G4ThreeVector& pPosition, 
                            const G4ThreeVector& pMomentumDirection,    
                                  G4double       curve_length, 
                                  G4double       kineticEnergy,
                            const G4double       restMass_c2,
                                  G4double,   // velocity
                                  G4double       pLaboratoryTimeOfFlight,
                                  G4double       pProperTimeOfFlight,
                            const G4ThreeVector* pPolarization,
                                  G4double       pdgSpin )
 : fDistanceAlongCurve(curve_length),
   fKineticEnergy(kineticEnergy),
   fRestMass_c2(restMass_c2),
   fLabTimeOfFlight(pLaboratoryTimeOfFlight), 
   fProperTimeOfFlight(pProperTimeOfFlight),
   fChargeState( DBL_MAX, DBL_MAX, -1.0 ) //  charge not set 
{
  UpdateFourMomentum( kineticEnergy, pMomentumDirection ); 
      // Sets momentum direction as well.
    
  SetPosition( pPosition );    
  fChargeState.SetPDGSpin( pdgSpin );   

  G4ThreeVector PolarVec(0.0, 0.0, 0.0); 
  if( pPolarization )  { PolarVec= *pPolarization; }
  SetPolarization( PolarVec );
}

G4FieldTrack::G4FieldTrack( char )                  //  Nothing is set !!
  : fKineticEnergy(0.), fRestMass_c2(0.), fLabTimeOfFlight(0.),
    fProperTimeOfFlight(0.), fChargeState( DBL_MAX , DBL_MAX, -1 )
{
  G4ThreeVector Zero(0.0, 0.0, 0.0);
  SetCurvePnt( Zero, Zero, 0.0 );
  SetPolarization( Zero ); 
  // fInitialMomentumMag= 0.00; // Invalid
  // fLastMomentumMag= 0.0; 
}

void G4FieldTrack::
     SetChargeAndMoments(G4double charge, 
                         G4double magnetic_dipole_moment, // default= DBL_MAX - do not change
                         G4double electric_dipole_moment, //   ditto
                         G4double magnetic_charge )       //   ditto
{
  fChargeState.SetChargesAndMoments( charge,  
                                     magnetic_dipole_moment, 
                                     electric_dipole_moment,  
                                     magnetic_charge ); 

  // NOTE: Leaves Spin unchanged !
  // 
  // G4double pdgSpin= fChargeState.GetSpin();   // New Property of ChargeState (not well documented! )

  // IDEA: Improve the implementation using handles
  //   -- and handle to the old one (which can be shared by other copies) and
  //      must not be left to hang loose 
  // 
  // fpChargeState= new G4ChargeState(  charge, magnetic_dipole_moment, 
  //                         electric_dipole_moment, magnetic_charge  ); 
}

// Load values from array
//  
//   note that momentum direction must-be/is normalised

void G4FieldTrack::LoadFromArray(const G4double valArrIn[ncompSVEC],
                                       G4int noVarsIntegrated)
{
  G4int i;

  // Fill the variables not integrated with zero -- so it's clear !!
  G4double valArr[ncompSVEC];
  for( i=0; i<noVarsIntegrated; i++){
     valArr[i]= valArrIn[i];
  }
  for( i=noVarsIntegrated; i<ncompSVEC; i++) {
     valArr[i]= 0.0; 
  }

  SixVector[0]=valArr[0];
  SixVector[1]=valArr[1];
  SixVector[2]=valArr[2];
  SixVector[3]=valArr[3];
  SixVector[4]=valArr[4];
  SixVector[5]=valArr[5];

  G4ThreeVector Momentum(valArr[3],valArr[4],valArr[5]);

  G4double momentum_square= Momentum.mag2();
  fMomentumDir= Momentum.unit();

  fKineticEnergy = momentum_square / 
                   (std::sqrt(momentum_square+fRestMass_c2*fRestMass_c2)
                     + fRestMass_c2 ); 
  // The above equation is stable for small and large momenta

  // The following components may or may not be
  //    integrated over -- integration is optional
  // fKineticEnergy= valArr[6];

  fLabTimeOfFlight=valArr[7];
  fProperTimeOfFlight=valArr[8];
  G4ThreeVector  vecPolarization= G4ThreeVector(valArr[9],valArr[10],valArr[11]);
  SetPolarization( vecPolarization ); 

  // fMomentumDir=G4ThreeVector(valArr[13],valArr[14],valArr[15]);
  // fDistanceAlongCurve= valArr[]; 
}