#include <G4EqEMFieldWithSpin.hh>

Inheritance diagram for G4EqEMFieldWithSpin:

Public Member Functions
	G4EqEMFieldWithSpin (G4ElectroMagneticField *emField)

	~G4EqEMFieldWithSpin () override

void	SetChargeMomentumMass (G4ChargeState particleCharge, G4double MomentumXc, G4double mass) override

void	EvaluateRhsGivenB (const G4double y[], const G4double Field[], G4double dydx[]) const override

void	SetAnomaly (G4double a)

G4double	GetAnomaly () const

Public Member Functions inherited from G4EquationOfMotion
	G4EquationOfMotion (G4Field *Field)

virtual	~G4EquationOfMotion ()

virtual void	EvaluateRhsGivenB (const G4double y[], const G4double B[3], G4double dydx[]) const =0

void	RightHandSide (const G4double y[], G4double dydx[]) const

void	EvaluateRhsReturnB (const G4double y[], G4double dydx[], G4double Field[]) const

void	GetFieldValue (const G4double Point[4], G4double Field[]) const

const G4Field *	GetFieldObj () const

G4Field *	GetFieldObj ()

void	SetFieldObj (G4Field *pField)

Detailed Description

Definition at line 43 of file G4EqEMFieldWithSpin.hh.

Constructor & Destructor Documentation

◆ G4EqEMFieldWithSpin()

G4EqEMFieldWithSpin::G4EqEMFieldWithSpin ( G4ElectroMagneticField * emField )

Definition at line 38 of file G4EqEMFieldWithSpin.cc.

  : G4EquationOfMotion( emField ) 
{
}

◆ ~G4EqEMFieldWithSpin()

G4EqEMFieldWithSpin::~G4EqEMFieldWithSpin ( )

overridedefault

Member Function Documentation

◆ EvaluateRhsGivenB()

void G4EqEMFieldWithSpin::EvaluateRhsGivenB	(	const G4double	y[],
		const G4double	Field[],
		G4double	dydx[] ) const

override

Definition at line 80 of file G4EqEMFieldWithSpin.cc.

{
 
   // Components of y:
   //    0-2 dr/ds,
   //    3-5 dp/ds - momentum derivatives
   //    9-11 dSpin/ds = (1/beta) dSpin/dt - spin derivatives
 
   // The BMT equation, following J.D.Jackson, Classical
   // Electrodynamics, Second Edition,
   // dS/dt = (e/mc) S \cross
   //              [ (g/2-1 +1/\gamma) B
   //               -(g/2-1)\gamma/(\gamma+1) (\beta \cdot B)\beta
   //               -(g/2-\gamma/(\gamma+1) \beta \cross E ]
   // where
   // S = \vec{s}, where S^2 = 1
   // B = \vec{B}
   // \beta = \vec{\beta} = \beta \vec{u} with u^2 = 1
   // E = \vec{E}
 
   G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
 
   G4double Energy   = std::sqrt( pSquared + fMassCof );
   G4double cof2     = Energy/c_light ;
 
   G4double pModuleInverse  = 1.0/std::sqrt(pSquared) ;
 
   G4double inverse_velocity = Energy * pModuleInverse / c_light;
 
   G4double cof1 = fElectroMagCof*pModuleInverse ;
 
   dydx[0] = y[3]*pModuleInverse ;                         
   dydx[1] = y[4]*pModuleInverse ;                         
   dydx[2] = y[5]*pModuleInverse ;                        
 
   dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
   
   dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ; 
 
   dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;  
   
   dydx[6] = dydx[8] = 0.;//not used
 
   // Lab Time of flight
   dydx[7] = inverse_velocity;
   
   G4ThreeVector BField(Field[0],Field[1],Field[2]);
   G4ThreeVector EField(Field[3],Field[4],Field[5]);
 
   EField /= c_light;
 
   G4ThreeVector u(y[3], y[4], y[5]);
   u *= pModuleInverse;
 
   G4double udb = anomaly*beta*gamma/(1.+gamma) * (BField * u);
   G4double ucb = (anomaly+1./gamma)/beta;
   G4double uce = anomaly + 1./(gamma+1.);
 
   G4ThreeVector Spin(y[9],y[10],y[11]);
 
   G4double pcharge;
   if (charge == 0.)
   {
     pcharge = 1.;
   }
   else
   {
     pcharge = charge;
   }
 
   G4ThreeVector dSpin(0.,0.,0.);
   if (Spin.mag2() != 0.)
   {
      dSpin = pcharge*omegac*( ucb*(Spin.cross(BField))-udb*(Spin.cross(u))
                           // from Jackson
                           // -uce*Spin.cross(u.cross(EField)) );
                           // but this form has one less operation
                     - uce*(u*(Spin*EField) - EField*(Spin*u)) );
   }
 
   dydx[ 9] = dSpin.x();
   dydx[10] = dSpin.y();
   dydx[11] = dSpin.z();
 
   return;
}

◆ GetAnomaly()

G4double G4EqEMFieldWithSpin::GetAnomaly ( ) const

inline

Definition at line 61 of file G4EqEMFieldWithSpin.hh.

61{ return anomaly; }

◆ SetAnomaly()

void G4EqEMFieldWithSpin::SetAnomaly ( G4double a )

inline

Definition at line 60 of file G4EqEMFieldWithSpin.hh.

60{ anomaly = a; }

◆ SetChargeMomentumMass()

void G4EqEMFieldWithSpin::SetChargeMomentumMass	(	G4ChargeState	particleCharge,
		G4double	MomentumXc,
		G4double	mass )

overridevirtual

Implements G4EquationOfMotion.

Definition at line 46 of file G4EqEMFieldWithSpin.cc.

{
   charge    = particleCharge.GetCharge();
   mass      = particleMass;
   magMoment = particleCharge.GetMagneticDipoleMoment();
   spin      = particleCharge.GetSpin();
 
   fElectroMagCof =  eplus*charge*c_light ;
   fMassCof = mass*mass;
 
   omegac = (eplus/mass)*c_light;
 
   G4double muB = 0.5*eplus*hbar_Planck/(mass/c_squared);
 
   G4double g_BMT;
   if ( spin != 0. )
   {
     g_BMT = (std::abs(magMoment)/muB)/spin;
   }
   else
   {
     g_BMT = 2.;
   }
 
   anomaly = (g_BMT - 2.)/2.;
 
   G4double E = std::sqrt(sqr(MomentumXc)+sqr(mass));
   beta  = MomentumXc/E;
   gamma = E/mass;
}

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

Public Member Functions