org.lcsim.recon.tracking.trfdca

Class PropDCACyl

java.lang.Object

org.lcsim.recon.tracking.trfbase.Propagator

org.lcsim.recon.tracking.trfbase.PropDirected

org.lcsim.recon.tracking.trfdca.PropDCACyl

public class PropDCACyl
extends PropDirected

Propagates tracks from a DCA surface to a Cylinder.

Propagation will fail if either the origin is not a DCA surface, or the destination is not a Cylinder.

The default direction for propagation is forward.

Propagation to a cylinder at the radius of the DCA will succeed and the track parameters are valid but the errors are not valid.

Version:

1.0

Author:

Norman A. Graf

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) class	PropDCACyl.ST_DCACyl

Field Summary

Fields

Modifier and Type	Field and Description
private double	_bfac
static int	IALF
static int	IPHI
static int	IPHID
static int	IQPT_CYL
static int	IQPT_DCA
static int	IRSIGNED
static int	ITLM_CYL
static int	ITLM_DCA
static int	IZ_CYL
static int	IZ_DCA

Constructor Summary

Constructors

Constructor and Description
PropDCACyl(double bfield) Construct an instance from a constant solenoidal magnetic field in Tesla.

Method Summary

Methods

Modifier and Type	Method and Description
double	bField() Return the strength of the magnetic field in Tesla.
PropStat	dcaCylPropagate(double _bfac, VTrack trv, Surface srf, PropDir dir, TrackDerivative deriv) Propagate from dca to cylinder.
Propagator	newPropagator() Clone an instance.
static String	staticType() Return a String representation of the class' type name.
String	toString() output stream
String	type() Return a String representation of the class' type name.
static String	typeName() Return a String representation of the class' type name.
PropStat	vecDirProp(VTrack trv, Surface srf, PropDir dir) Propagate a track without error in the specified direction.
PropStat	vecDirProp(VTrack trv, Surface srf, PropDir dir, TrackDerivative deriv) Propagate a track without error in the specified direction.

Methods inherited from class org.lcsim.recon.tracking.trfbase.PropDirected

direction, direction, errProp, vecProp

Methods inherited from class org.lcsim.recon.tracking.trfbase.Propagator

errDirProp, errDirProp, errProp, reduce, reduceDirection, vecProp

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

IRSIGNED

public static final int IRSIGNED

See Also:

Constant Field Values

IZ_DCA

public static final int IZ_DCA

See Also:

Constant Field Values

IPHID

public static final int IPHID

See Also:

Constant Field Values

ITLM_DCA

public static final int ITLM_DCA

See Also:

Constant Field Values

IQPT_DCA

public static final int IQPT_DCA

See Also:

Constant Field Values

IPHI

public static final int IPHI

See Also:

Constant Field Values

IZ_CYL

public static final int IZ_CYL

See Also:

Constant Field Values

IALF

public static final int IALF

See Also:

Constant Field Values

ITLM_CYL

public static final int ITLM_CYL

See Also:

Constant Field Values

IQPT_CYL

public static final int IQPT_CYL

See Also:

Constant Field Values

_bfac

private double _bfac

Constructor Detail

PropDCACyl

public PropDCACyl(double bfield)

Construct an instance from a constant solenoidal magnetic field in Tesla.

Parameters:

bfield - The magnetic field strength in Tesla.

Method Detail

typeName

public static String typeName()

Return a String representation of the class' type name. Included for completeness with the C++ version.

Returns:

A String representation of the class' type name.

staticType

public static String staticType()

Return a String representation of the class' type name. Included for completeness with the C++ version.

Returns:

A String representation of the class' type name.

newPropagator

public Propagator newPropagator()

Clone an instance.

Specified by:

newPropagator in class Propagator

Returns:

A Clone of this instance.

type

public String type()

Return a String representation of the class' type name. Included for completeness with the C++ version.

Returns:

A String representation of the class' type name.

vecDirProp

public PropStat vecDirProp(VTrack trv,
                  Surface srf,
                  PropDir dir,
                  TrackDerivative deriv)

Propagate a track without error in the specified direction. and return the derivative matrix in deriv. The track parameters for a cylinder are: phi z alpha tan(lambda) curvature

Specified by:

vecDirProp in class Propagator

Parameters:

trv - The VTrack to propagate.

srf - The Surface to which to propagate.

dir - The direction in which to propagate.

deriv - The track derivatives to update at the surface srf.

Returns:

The propagation status.

vecDirProp

public PropStat vecDirProp(VTrack trv,
                  Surface srf,
                  PropDir dir)

Propagate a track without error in the specified direction. The track parameters for a cylinder are: phi z alpha tan(lambda) curvature

Overrides:

vecDirProp in class Propagator

Parameters:

trv - The VTrack to propagate.

srf - The Surface to which to propagate.

dir - The direction in which to propagate.

Returns:

The propagation status.

bField

public double bField()

Return the strength of the magnetic field in Tesla.

Returns:

The strength of the magnetic field in Tesla.

toString

public String toString()

output stream

Overrides:

toString in class Object

Returns:

A String representation of this instance.

dcaCylPropagate

public PropStat dcaCylPropagate(double _bfac,
                       VTrack trv,
                       Surface srf,
                       PropDir dir,
                       TrackDerivative deriv)

Propagate from dca to cylinder. Why is this public?

Parameters:

_bfac - The numerical factor (including the field)

trv - The VTrack to propagate.

srf - The cylindrical surface to which to propagate.

dir - The direction in which to propagate.

deriv - The track derivatives to update at the surface srf.

Returns:

The propagation status.