Public Types
enum	EBField { kUndefined = 0, kConstant = 1, kMapped = 2, kChain = 3 }

enum	ESmFSizes { nZ = 57, nR = 28, nPhi = 37, nZSteel = 16, nRSteel = 115, nPhiSteel = 25 }

Public Member Functions
virtual Float_t	Interpolate (const Float_t Xarray[], const Float_t Yarray[], const Int_t ORDER, const Float_t x)
	Interpolate a 3x2 table (quadratic) or a 2x2 table (linear)

virtual void	Interpolate2DBfield (const Float_t r, const Float_t z, Float_t &Br_value, Float_t &Bz_value)
	Interpolate the B field map - 2D interpolation.

virtual void	Interpolate2ExtDBfield (const Float_t r, const Float_t z, Float_t &Br_value, Float_t &Bz_value)

virtual void	Interpolate3DBfield (const Float_t r, const Float_t z, const Float_t phi, Float_t &Br_value, Float_t &Bz_value, Float_t &Bphi_value)
	Interpolate the B field map - 3D interpolation.

virtual void	Interpolate3DBSteelfield (const Float_t r, const Float_t z, const Float_t phi, Float_t &Br_value, Float_t &Bz_value, Float_t &Bphi_value)
	Interpolate the B field map - 3D interpolation.

	StarMagField (EBField map=kMapped, Float_t Factor=1, Bool_t Lock=kFALSE, Float_t Rescale=1, Float_t Bdipole=-42.67, Float_t Rmaxdip=15.34, Float_t Zmindip=980.0, Float_t Zmaxdip=1350.0)

virtual void	BField (const Float_t x[], Float_t B[])

virtual void	BField (const Double_t x[], Double_t B[])
	B field in Cartesian coordinates - 2D field (ie. Phi symmetric)

virtual void	Field (const Float_t x[], Float_t B[])

virtual void	Field (const Double_t x[], Double_t B[])

virtual void	BrBzField (const Float_t r, const Float_t z, Float_t &Br_value, Float_t &Bz_value)
	B field in Radial coordinates - 2D field (ie Phi symmetric)

virtual void	B3DField (const Float_t x[], Float_t B[])
	Bfield in Cartesian coordinates - 3D field.

virtual void	B3DField (const Double_t x[], Double_t B[])

virtual void	BrBz3DField (const Float_t r, const Float_t z, const Float_t phi, Float_t &Br_value, Float_t &Bz_value, Float_t &Bphi_value)

virtual void	SetFactor (Float_t factor=1)

virtual void	SetRescale (Float_t factor=1)

virtual void	SetBDipole (Float_t m=-42.67)

virtual void	SetRmaxDip (Float_t m=15.3)

virtual void	SetZminDip (Float_t m=980.0)

virtual void	SetZmaxDip (Float_t m=1350.0)

virtual void	SetLock ()

virtual EBField	GetMap ()

virtual Float_t	GetFactor ()

virtual Float_t	GetRescale ()

virtual Bool_t	IsLocked ()

virtual void	Print (Option_t *opt="") const

Static Public Member Functions
static void	Search (Int_t N, const Float_t Xarray[], Float_t x, Int_t &low)
	Search an ordered table by starting at the most recently used point.

static StarMagField *	Instance ()

static void	setConstBz (bool state)

Public Attributes
EBField	fMap

Float_t	fFactor

Float_t	fRescale

Float_t	fBDipole

Float_t	fRmaxDip

Float_t	fZminDip

Float_t	fZmaxDip

Bool_t	fLock

Float_t	Bz [nZ][nR]

Float_t	Br [nZ][nR]

Float_t	Radius [nR]

Float_t	ZList [nZ]

Float_t	Bz3D [nPhi][nZ][nR]

Float_t	Br3D [nPhi][nZ][nR]

Float_t	Bphi3D [nPhi][nZ][nR]

Float_t	R3D [nR]

Float_t	Z3D [nZ]

Float_t	Phi3D [nPhi]

Float_t	R3DSteel [nRSteel]

Float_t	Z3DSteel [nZSteel]

Float_t	Phi3DSteel [nPhiSteel]

Float_t	Bz3DSteel [nPhiSteel][nZSteel][nRSteel]

Float_t	Bx3DSteel [nPhiSteel][nZSteel][nRSteel]

Float_t	By3DSteel [nPhiSteel][nZSteel][nRSteel]

Float_t	Br3DSteel [nPhiSteel][nZSteel][nRSteel]

Float_t	Bphi3DSteel [nPhiSteel][nZSteel][nRSteel]

Static Public Attributes
static bool	mConstBz = false

Detailed Description

Author: Jim Thomas 10 October 2000

A package of Bfield. Methods included to read the correct Bfield map and scale it according to a scale factor provided during instantiation. The statement from W.Love is that the Bfield map accuracy FWHM = 1 G.

An enumerated argument provided at the time of instantiation selects a constant magnetic field (value=1) or the measured magnetic field (value=2) at a field setting that you select manually. Alternatively, you can use the database to determine the magnetic field setting but you must then provide a a time stamp and use a different instantiation (this is usually done in the chain).

The enumerations for the manual settings are: enum EBField { kUndefined = 0, kConstant = 1, kMapped = 2, kChain = 3 } ; "kConstant = 1" means you wish to work with a constant, uniform, field. "kMapped = 2" means you want to read values from the measured magnet maps. The other enumerations are undefined and reserved for future expansion.

This code works in kGauss, cm - but note that the Bfield maps on disk are in gauss, cm.

To do:

Finish pulling parameters out of DB rather than from #define.
Use Magnet current rather than MafFactor
Add a routine to distort the track if we are given a Geant Vector full of points == a track
Add simulated B field map in the regions where the field is not mapped.

Definition at line 97 of file StarMagField.h.

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

StarMagField/StarMagField.h
StarMagField/StarMagField.cxx

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Static Public Attributes

Detailed Description