Package xal.model.alg

Enum Class EnvelopeTrackerBase.EmitGrowthModel

java.lang.Object
java.lang.Enum<EnvelopeTrackerBase.EmitGrowthModel>
xal.model.alg.EnvelopeTrackerBase.EmitGrowthModel
All Implemented Interfaces:
Serializable, Comparable<EnvelopeTrackerBase.EmitGrowthModel>, Constable
Enclosing class:
EnvelopeTrackerBase
public static enum EnvelopeTrackerBase.EmitGrowthModel extends Enum<EnvelopeTrackerBase.EmitGrowthModel>

RF Gap Emittance Growth Models

Enumerations identifying supported emittance growth models for RF accelerating gaps. (Currently this applies primarily to the longitudinal situation.) at the moment.

Since longitudinal emittance growth mechanism is not well documented in the Trace3D manual, it is somewhat unclear how the effect is being modeled. However, it does appear to create a result that tracks the IMPACT simulation better than the CKA method (at least for one case). At this point it is unclear whether there is an error in the analysis of C.K. Allen, or Trace3D is simply more accurate.

VALUES:
Currently there are two supported mechanisms for emittance growth.
Trace3D: use the same mechanism described in the Trace3D manual.
CKAllen: use the mechanism described by C.K. Allen, et. al. (see below).

References
[1] M. Weiss, "Bunching of Intense Proton Beams with Six-Dimensional Matching to the Linac Acceptance", CERN/MPS/LI report 73-2, Geneva, Switzerland (1978).
[2] K.R. Crandall and D.P. Rusthoi, "Trace 3-D Documentation", LANL Report LA-UR-97-887 (1997), Appendix F.
[3] C.K. Allen, H. Sako, M. Ikegami, and G. Shen, "Emittance Growth Due to Phase Spread for Proton Beams in Radio Frequency Accelerating Gaps", (in preparation).

Since:
Feb 23, 2009
Author:
Christopher K. Allen

  • Enum Constant Details

  • Method Details

    • values

      public static EnvelopeTrackerBase.EmitGrowthModel[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static EnvelopeTrackerBase.EmitGrowthModel valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum class has no constant with the specified name
      NullPointerException - if the argument is null