#include <G4Mag_SpinEqRhs.hh>

Inheritance diagram for G4Mag_SpinEqRhs:

Public Member Functions
	G4Mag_SpinEqRhs (G4MagneticField *MagField)

	~G4Mag_SpinEqRhs ()

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

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

void	SetAnomaly (G4double a)

G4double	GetAnomaly () const

Public Member Functions inherited from G4Mag_EqRhs
	G4Mag_EqRhs (G4MagneticField *magField)

virtual	~G4Mag_EqRhs ()

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

G4double	FCof () const

virtual void	SetChargeMomentumMass (G4double particleCharge, G4double MomentumXc, G4double mass)

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

virtual void	SetChargeMomentumMass (G4double particleCharge, G4double MomentumXc, G4double MassXc2)=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

void	SetFieldObj (G4Field *pField)

Detailed Description

Definition at line 50 of file G4Mag_SpinEqRhs.hh.

Constructor & Destructor Documentation

◆ G4Mag_SpinEqRhs()

G4Mag_SpinEqRhs::G4Mag_SpinEqRhs ( G4MagneticField * MagField )

Definition at line 45 of file G4Mag_SpinEqRhs.cc.

  : G4Mag_EqRhs( MagField ), omegac(0.), anomaly(0.0011659208),
    pcharge(0.), E(0.), gamma(0.), beta(0.)
{
}

◆ ~G4Mag_SpinEqRhs()

G4Mag_SpinEqRhs::~G4Mag_SpinEqRhs ( )

Definition at line 51 of file G4Mag_SpinEqRhs.cc.

52{

53}

Member Function Documentation

◆ EvaluateRhsGivenB()

void G4Mag_SpinEqRhs::EvaluateRhsGivenB	(	const G4double	y[],
		const G4double	B[3],
		G4double	dydx[]
	)		const

virtual

Implements G4Mag_EqRhs.

Definition at line 76 of file G4Mag_SpinEqRhs.cc.

{
   G4double momentum_mag_square = sqr(y[3]) + sqr(y[4]) + sqr(y[5]);
   G4double inv_momentum_magnitude = 1.0 / std::sqrt( momentum_mag_square );
   G4double cof = FCof()*inv_momentum_magnitude;
 
   dydx[0] = y[3] * inv_momentum_magnitude;       //  (d/ds)x = Vx/V
   dydx[1] = y[4] * inv_momentum_magnitude;       //  (d/ds)y = Vy/V
   dydx[2] = y[5] * inv_momentum_magnitude;       //  (d/ds)z = Vz/V
 
   if (pcharge == 0.) {
      dydx[3] = 0.;
      dydx[4] = 0.;
      dydx[5] = 0.;
   } else {
      dydx[3] = cof*(y[4]*B[2] - y[5]*B[1]) ;   // Ax = a*(Vy*Bz - Vz*By)
      dydx[4] = cof*(y[5]*B[0] - y[3]*B[2]) ;   // Ay = a*(Vz*Bx - Vx*Bz)
      dydx[5] = cof*(y[3]*B[1] - y[4]*B[0]) ;   // Az = a*(Vx*By - Vy*Bx)
   }
 
   G4ThreeVector u(y[3], y[4], y[5]);
   u *= inv_momentum_magnitude; 
 
   G4ThreeVector BField(B[0],B[1],B[2]);
 
   G4double udb = anomaly*beta*gamma/(1.+gamma) * (BField * u); 
   G4double ucb = (anomaly+1./gamma)/beta;
 
   // Initialise the values of dydx that we do not update.
   dydx[6] = dydx[7] = dydx[8] = 0.0;
 
   G4ThreeVector Spin(y[9],y[10],y[11]);
 
   G4ThreeVector dSpin;
 
   if (pcharge == 0.) {
      // dSpin = (3.8260837/2.)*omegac*(Spin.cross(BField));
      dSpin = omegac*(ucb*(Spin.cross(BField))-udb*(Spin.cross(u)));
   } else {
      dSpin = pcharge*omegac*(ucb*(Spin.cross(BField))-udb*(Spin.cross(u)));
   }
 
   dydx[ 9] = dSpin.x();
   dydx[10] = dSpin.y();
   dydx[11] = dSpin.z();
 
   return ;
}

◆ GetAnomaly()

G4double G4Mag_SpinEqRhs::GetAnomaly ( ) const

inline

Definition at line 69 of file G4Mag_SpinEqRhs.hh.

69{ return anomaly; }

◆ SetAnomaly()

void G4Mag_SpinEqRhs::SetAnomaly ( G4double a )

inline

Definition at line 68 of file G4Mag_SpinEqRhs.hh.

68{ anomaly = a; }

Referenced by SetChargeMomentumMass().

◆ SetChargeMomentumMass()

void G4Mag_SpinEqRhs::SetChargeMomentumMass	(	G4double	particleCharge,
		G4double	MomentumXc,
		G4double	mass
	)