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Paper   IPM / Physic / 7648
School of Physics
  Title:   Self-Field Effects on Electron Dynamics in Free-Electron Lasers with Axial Magnetic Field
  Author(s): 
1.  S. Mirzanejhad
2.  B. Maraghechi
3.  T. Mohsenpour
  Status:   Published
  Journal: Phys. Plasmas
  No.:  10
  Vol.:  11
  Year:  2004
  Pages:   4777-4783
  Supported by:  IPM
  Abstract:
A self-consistent method for the analysis of self-magnetic field for a free-electron laser with a one-dimensional helical wiggler and an axial guide magnetic field is presented. The equilibrium orbits and their stability, under the influence of self-electric and self-magnetic fields, are analyzed. New unstable orbits, in the first part of the Group I orbits and in the resonance region of the Group II orbits, are found. It is shown that an increase in the defocusing effect of self-fields will widen the unstable orbits. An anomalous self-field regime is found where an increase in the defocusing effect of self-fields can have stabilizing effect on the resonance region.

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