org.lcsim.recon.tracking.trfcylplane

Class PropZCyl

java.lang.Object

org.lcsim.recon.tracking.trfbase.Propagator

org.lcsim.recon.tracking.trfbase.PropDirected

org.lcsim.recon.tracking.trfcylplane.PropZCyl

public class PropZCyl
extends PropDirected

Propagates tracks from an ZPlane to a Cylinder in a constant field.

Propagation will fail if either the origin is not an ZPlane or destination is not a Cylinder. Propagator works incorrectly for tracks with very small curvatures.

Version:

1.0

Author:

Norman A. Graf

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) class	PropZCyl.STCalcZ

Field Summary

Fields

Modifier and Type	Field and Description
private double	_bfac
private static int	IALF
private static int	IDXDZ
private static int	IDYDZ
private static int	IPHI
private static int	IQP_Z
private static int	IQPT
private static int	ITLM
private static int	IX
private static int	IY
private static int	IZ

Constructor Summary

Constructors

Constructor and Description
PropZCyl(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.
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 and return the derivative matrix in deriv.
private PropStat	vecPropagateZCyl(double bfac, VTrack trv, Surface srf, PropDir dir, TrackDerivative deriv)

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

IX

private static final int IX

See Also:

Constant Field Values

IY

private static final int IY

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Constant Field Values

IDXDZ

private static final int IDXDZ

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Constant Field Values

IDYDZ

private static final int IDYDZ

See Also:

Constant Field Values

IQP_Z

private static final int IQP_Z

See Also:

Constant Field Values

IPHI

private static final int IPHI

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Constant Field Values

IZ

private static final int IZ

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Constant Field Values

IALF

private static final int IALF

See Also:

Constant Field Values

ITLM

private static final int ITLM

See Also:

Constant Field Values

IQPT

private static final int IQPT

See Also:

Constant Field Values

_bfac

private double _bfac

Constructor Detail

PropZCyl

public PropZCyl(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.

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.

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.

bField

public double bField()

Return the strength of the magnetic field in Tesla.

Returns:

The strength of the magnetic field in Tesla.

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.

toString

public String toString()

output stream

Overrides:

toString in class Object

Returns:

A String representation of this instance.

vecPropagateZCyl

private PropStat vecPropagateZCyl(double bfac,
                        VTrack trv,
                        Surface srf,
                        PropDir dir,
                        TrackDerivative deriv)