gov.sns.xal.model.alg
Class Trace3dTracker

java.lang.Object
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        +--gov.sns.xal.model.alg.Trace3dTracker

All Implemented Interfaces:

IAlgorithm, IArchive, java.rmi.Remote

public class Trace3dTracker

extends Tracker

Tracking algorithm for EnvelopeProbe's. The EnvelopeProbe's state, which is a CorrelationMatrix object, is advanced using the linear dynamics portion of any beamline element (IElement exposing object) transfer map. The linear portion is represented as a matrix, thus, the state advance is accomplished with a transpose conjugation with this matrix. The effects of space charge are also included in the dynamics calculations. Space charge effects are also represented with a matrix transpose conjugation, however, the matrix is computated using the values of the probe's correlation matrix. The result is a nonlinear effect. The space charge forces are computed using a linear fit to the fields generated by an ellipsoidal charge distribution with the same statistics described in the probe's correlation matrix. The linear fit is weighted by the beam distribution itself, so it is more accurate in regions of higher charged density. For a complete description see the reference below.

See Also:

EllipsoidalCharge, Theory and Technique of Beam Envelope Simulation

Field Summary

static java.lang.Class	s_clsProbeType probe type recognized by this algorithm
static int	s_intVersion current algorithm version
static java.lang.String	s_strTypeId string type identifier for algorithm

Fields inherited from class gov.sns.xal.model.alg.Tracker

ATTRTAG_DEBUG, ATTRTAG_TYPE, ATTRTAG_UPDATE, ATTRTAG_VER, CALC_RFGAP_PHASE, NODETAG_ALG, NODETAG_TRACKER, NODETAG_TRAJ, UPDATE_ALWAYS, UPDATE_CUSTOM, UPDATE_ENTRANCE, UPDATE_ENTRANCEANDEXIT, UPDATE_EXIT

Constructor Summary

Trace3dTracker()
Creates a new instance of EnvelopeTracker

Method Summary

protected void	advanceState(IProbe ifcProbe, IElement ifcElem, double dblLen) Advances the probe state through a subsection of the element with the specified length.
void	doPropagation(IProbe probe, IElement elem) Propagates the probe through the element.

Methods inherited from class gov.sns.xal.model.alg.Tracker

advanceProbe, getArchive, getDebugMode, getElemPosition, getProbeUpdatePolicy, getStartElementId, getStopElementId, getType, getVersion, initialize, load, propagate, registerProbeType, save, setDebugMode, setElemPosition, setProbeUpdatePolicy, setStartElementId, setStopElementId, unsetStartElementId, unsetStopElementId, useRfGapPhaseCalculation, validElement, validProbe

Methods inherited from class java.lang.Object

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

Field Detail

s_strTypeId

public static final java.lang.String s_strTypeId

string type identifier for algorithm

See Also:

Constant Field Values

s_intVersion

public static final int s_intVersion

current algorithm version

See Also:

Constant Field Values

s_clsProbeType

public static final java.lang.Class s_clsProbeType

probe type recognized by this algorithm

Constructor Detail

Trace3dTracker

public Trace3dTracker()

Creates a new instance of EnvelopeTracker

Method Detail

doPropagation

public void doPropagation(IProbe probe,
                          IElement elem)
                   throws ModelException

Propagates the probe through the element.

Specified by:

doPropagation in class Tracker

Parameters:

probe - probe to propagate

elem - element acting on probe

Throws:

ModelException - invalid probe type or error in advancing probe

See Also:

Tracker.advanceProbe(gov.sns.xal.model.IProbe, gov.sns.xal.model.IElement, double), Tracker.validProbe(gov.sns.xal.model.IProbe)

advanceState

protected void advanceState(IProbe ifcProbe,
                            IElement ifcElem,
                            double dblLen)
                     throws ModelException

Advances the probe state through a subsection of the element with the specified length. Applies a space charge kick at the end of the element subsection for any probe having nonzero beam current.

Parameters:

ifcElem - interface to the beam element

ifcProbe - interface to the probe

dblLen - length of element subsection to advance through

Throws:

ModelException - bad element transfer matrix/corrupt probe state