org.lcsim.recon.tracking.trfcyl

Class PropCyl

java.lang.Object

org.lcsim.recon.tracking.trfbase.Propagator

org.lcsim.recon.tracking.trfbase.PropDirected

org.lcsim.recon.tracking.trfcyl.PropCyl

public class PropCyl
extends PropDirected

Propagates tracks from one cylinder to another in a constant solenoidal magnetic field.

Propagation will fail if either the origin or destination is not a cylinder.

Propagation more than halfway around one loop is not allowed and will result in failure if attempted.

Version:

1.0

Author:

Norman A. Graf

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) class	PropCyl.STCalc

Field Summary

Fields

Modifier and Type	Field and Description
private double	_bfac
private static int	IALF
private static int	IPHI
private static int	IQPT
private static int	ITLM
private static int	IZ

Constructor Summary

Constructors

Constructor and Description
PropCyl(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.
String	toString() output stream
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.

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, typeName, vecProp

Methods inherited from class java.lang.Object

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

Field Detail

IPHI

private static final int IPHI

See Also:

Constant Field Values

IZ

private static final int IZ

See Also:

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

PropCyl

public PropCyl(double bfield)

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

Parameters:

bfield - The magnetic field strength in Tesla.

Method Detail

newPropagator

public Propagator newPropagator()

Clone an instance.

Specified by:

newPropagator in class Propagator

Returns:

A Clone of this instance.

toString

public String toString()

output stream

Overrides:

toString in class Object

Returns:

A String representation 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.