G4ErrorMag_UsualEqRhs serves to reverse the magnetic field when propagation is backwards. It is used for error propagation. More...

#include <G4ErrorMag_UsualEqRhs.hh>

Inheritance diagram for G4ErrorMag_UsualEqRhs:

Public Member Functions
	G4ErrorMag_UsualEqRhs (G4MagneticField *MagField)
	~G4ErrorMag_UsualEqRhs () override=default
void	EvaluateRhsGivenB (const G4double y[], const G4double B[3], G4double dydx[]) const override
Public Member Functions inherited from G4Mag_UsualEqRhs
	G4Mag_UsualEqRhs (G4MagneticField *MagField)
	~G4Mag_UsualEqRhs () override=default
void	EvaluateRhsGivenB (const G4double y[], const G4double B[3], G4double dydx[]) const override
void	SetChargeMomentumMass (G4ChargeState particleCharge, G4double MomentumXc, G4double mass) override
G4EquationType	GetEquationType () const override
Public Member Functions inherited from G4Mag_EqRhs
	G4Mag_EqRhs (G4MagneticField *magField)
	~G4Mag_EqRhs () override=default
G4double	FCof () const
Public Member Functions inherited from G4EquationOfMotion
	G4EquationOfMotion (G4Field *Field)
virtual	~G4EquationOfMotion ()=default
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

G4ErrorMag_UsualEqRhs serves to reverse the magnetic field when propagation is backwards. It is used for error propagation.

Definition at line 46 of file G4ErrorMag_UsualEqRhs.hh.

Constructor & Destructor Documentation

◆ G4ErrorMag_UsualEqRhs()

G4ErrorMag_UsualEqRhs::G4ErrorMag_UsualEqRhs ( G4MagneticField * MagField )

Constructor for G4ErrorMag_UsualEqRhs.

Parameters

[in] MagField Pointer to the magnetic field.

Definition at line 36 of file G4ErrorMag_UsualEqRhs.cc.

  : G4Mag_UsualEqRhs( MagField )
{
}

◆ ~G4ErrorMag_UsualEqRhs()

G4ErrorMag_UsualEqRhs::~G4ErrorMag_UsualEqRhs ( )

overridedefault

Default Destructor.

Member Function Documentation

◆ EvaluateRhsGivenB()

void G4ErrorMag_UsualEqRhs::EvaluateRhsGivenB	(	const G4double	y[],
		const G4double	B[3],
		G4double	dydx[] ) const

overridevirtual

Calculates the value of the derivative, given the value of the magnetic field. Reverses dedx if propagation is backwards.

Parameters

[in]	y	Coefficients array.
[in]	B	Field value.
[out]	dydx	Derivatives array.

Implements G4Mag_EqRhs.

Definition at line 44 of file G4ErrorMag_UsualEqRhs.cc.

{
 
  G4Mag_UsualEqRhs::EvaluateRhsGivenB(y, B, dydx );
  
  if(G4ErrorPropagatorData::GetErrorPropagatorData()->GetMode()
     == G4ErrorMode_PropBackwards)
  {
    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[3] = cof*(y[4]*(-B[2]) - y[5]*(-B[1])) ;
    dydx[4] = cof*(y[5]*(-B[0]) - y[3]*(-B[2])) ;
    dydx[5] = cof*(y[3]*(-B[1]) - y[4]*(-B[0])) ;    
  }
  return;
}

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