gov.sns.xal.model.elem
Class ThinElement

java.lang.Object
  |
  +--gov.sns.xal.model.elem.Element
        |
        +--gov.sns.xal.model.elem.ThinElement

All Implemented Interfaces:

IComponent, IElement

Direct Known Subclasses:

IdealMagDipoleFace, IdealMagSteeringDipole, IdealRfGap, Marker, ThinLens, ThinMatrix

public abstract class ThinElement

extends Element

Classes derived from ThinElement are modeled as having no length. Thus, space charge effects are neglected here. The IElement interface method getLength() always returns zero. However, a ThinElement may have an "effective length" which is a parameter used to determine it's effect on the beam, that is, it is used to compute the transfer matrix.

Field Summary

Fields inherited from interface gov.sns.xal.model.IElement

LightSpeed, Permeability, Permittivity, UnitCharge

Constructor Summary

ThinElement(java.lang.String strType)
Creates a new instance of ThinElement specifying the element type identifier.

ThinElement(java.lang.String strType, java.lang.String strId)
Creates a new instance of ThinElement specifying with the element type identifier and the instance identifier.

Method Summary

protected abstract double	elapsedTime(IProbe probe) Returns the time taken for the probe to propagate through element.
double	elapsedTime(IProbe probe, double dblLen) Returns the time taken for the probe to drift through part of the element.
protected abstract double	energyGain(IProbe probe) Calculate the energy gain for this element on the supplied probe.
double	energyGain(IProbe probe, double dblLen) Calculate the energy gain for this element.
double	getLength() Return the length of this element
protected abstract PhaseMap	transferMap(IProbe probe) Compute the transfer matrix of this element.
PhaseMap	transferMap(IProbe probe, double dblLen) Compute the tranfer matrix for subsection of this element of length dblLen for the specified given probe.

Methods inherited from class gov.sns.xal.model.elem.Element

compDriftingTime, getId, getType, getUID, initializeFrom, print, propagate, setId

Methods inherited from class java.lang.Object

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

Constructor Detail

ThinElement

public ThinElement(java.lang.String strType)

Creates a new instance of ThinElement specifying the element type identifier.

Parameters:

strType - type identifier string of element

ThinElement

public ThinElement(java.lang.String strType,
                   java.lang.String strId)

Creates a new instance of ThinElement specifying with the element type identifier and the instance identifier.

Parameters:

strType - type string of element

strId - string identifier of the element

Method Detail

elapsedTime

protected abstract double elapsedTime(IProbe probe)

Returns the time taken for the probe to propagate through element.

Parameters:

probe - propagating probe

Returns:

elapsed time through element Units: seconds

energyGain

protected abstract double energyGain(IProbe probe)

Calculate the energy gain for this element on the supplied probe.

Returns:

this element's energy gain

transferMap

protected abstract PhaseMap transferMap(IProbe probe)
                                 throws ModelException

Compute the transfer matrix of this element.

Returns:

transfer map for this element

ModelException

getLength

public double getLength()

Return the length of this element

Specified by:

getLength in interface IComponent

Specified by:

getLength in class Element

Returns:

a value of zero

elapsedTime

public double elapsedTime(IProbe probe,
                          double dblLen)

Returns the time taken for the probe to drift through part of the element.

Specified by:

elapsedTime in interface IElement

Specified by:

elapsedTime in class Element

Parameters:

probe - propagating probe

dblLen - length of subsection to propagate through meters

Returns:

the elapsed time through sectionUnits: seconds

energyGain

public double energyGain(IProbe probe,
                         double dblLen)

Calculate the energy gain for this element. Because this is a thin element with no length, the length parameter is ignored.

Specified by:

energyGain in interface IElement

Specified by:

energyGain in class Element

Parameters:

probe - Probe for which energy gain is to be computed

Returns:

the energy gain for this element on the particular probe

transferMap

public PhaseMap transferMap(IProbe probe,
                            double dblLen)
                     throws ModelException

Compute the tranfer matrix for subsection of this element of length dblLen for the specified given probe. Because this is a thin element (with no length), the length parameter is ignored in computing the transfer matrix.

Specified by:

transferMap in interface IElement

Specified by:

transferMap in class Element

Parameters:

dblLen - length of subelement

probe - probe containing parameters for the subsectional transfer matrix

Returns:

transfer map for an element of length dblLen

Throws:

ModelException - unable to compute transfer map

See Also:

#transferMap()