BDSFieldMagMultipole Class Reference

Class that provides the magnetic strength in a quadrupole. More...

#include <BDSFieldMagMultipole.hh>

Inheritance diagram for BDSFieldMagMultipole:

Collaboration diagram for BDSFieldMagMultipole:

Public Member Functions
	BDSFieldMagMultipole (BDSMagnetStrength const *strength, G4double const brho, G4int const orderIn=12)
virtual G4ThreeVector	GetField (const G4ThreeVector &position, const G4double t=0) const
	Access the field value. More...
Public Member Functions inherited from BDSFieldMag
	BDSFieldMag ()
	BDSFieldMag (G4Transform3D transformIn)
virtual G4ThreeVector	GetField (const G4ThreeVector &position, const G4double t=0) const =0
virtual void	GetFieldValue (const G4double point[4], G4double *field) const
virtual G4ThreeVector	GetFieldTransformed (const G4ThreeVector &position, const G4double t) const
	Get the field value after applying transform for local offset. More...
virtual void	SetTransform (const G4Transform3D &transformIn)
G4bool	FiniteStrength () const
	Accessor. More...

Private Member Functions
	BDSFieldMagMultipole ()
	Private default constructor to force use of supplied constructor.

Private Attributes
G4int	order
	Order up to which field components are considered. More...
G4int	maximumNonZeroOrder
std::vector< G4double >	normalComponents
	Normal field components (normal - ie not skew) = kn * brho. More...
std::vector< G4double >	skewComponents
	Skew field components = kns * brho. More...

Additional Inherited Members
Protected Attributes inherited from BDSFieldMag
G4bool	finiteStrength
	Flag to cache whether finite nor not. More...
G4Transform3D	transform
	Transform to apply for the field relative to the local coordinates of the geometry. More...

Detailed Description

Class that provides the magnetic strength in a quadrupole.

The magnetic field is calculated from the strength parameters "kn" up to a specified order and a design rigidity (brho).

Definition at line 38 of file BDSFieldMagMultipole.hh.

Constructor & Destructor Documentation

BDSFieldMagMultipole()

BDSFieldMagMultipole::BDSFieldMagMultipole	(	BDSMagnetStrength const *	strength,
		G4double const	brho,
		G4int const	orderIn = 12
	)

Definition at line 30 of file BDSFieldMagMultipole.cc.

~BDSFieldMagMultipole()

virtual BDSFieldMagMultipole::~BDSFieldMagMultipole ( )

inlinevirtual

Definition at line 45 of file BDSFieldMagMultipole.hh.

Member Function Documentation

GetField()

G4ThreeVector BDSFieldMagMultipole::GetField ( const G4ThreeVector &  position, const G4double  t = 0  ) const

virtual

Access the field value.

Implements BDSFieldMag.

Definition at line 67 of file BDSFieldMagMultipole.cc.

References BDS::IsFiniteStrength(), maximumNonZeroOrder, normalComponents, and skewComponents.

Here is the call graph for this function:

Field Documentation

maximumNonZeroOrder

G4int BDSFieldMagMultipole::maximumNonZeroOrder

private

Identify which is the maximum non-zero order in either normal or skew components and only sum up to this in the field calculation. Just an optimisation to save addition.

Definition at line 61 of file BDSFieldMagMultipole.hh.

Referenced by GetField().

normalComponents

std::vector<G4double> BDSFieldMagMultipole::normalComponents

private

Normal field components (normal - ie not skew) = kn * brho.

Definition at line 64 of file BDSFieldMagMultipole.hh.

Referenced by GetField().

order

G4int BDSFieldMagMultipole::order

private

Order up to which field components are considered.

Definition at line 56 of file BDSFieldMagMultipole.hh.

skewComponents

std::vector<G4double> BDSFieldMagMultipole::skewComponents

private

Skew field components = kns * brho.

Definition at line 67 of file BDSFieldMagMultipole.hh.

Referenced by GetField().

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

• /Users/nevay/physics/reps/bdsim/include/BDSFieldMagMultipole.hh
• /Users/nevay/physics/reps/bdsim/src/BDSFieldMagMultipole.cc