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Self-fields in an Ion-channel Free-electron Laser

  • MAHDI ESMAEILZADEH (a1), JOSEPH E. WILLETT (a2) and LORI JO WILLETT (a3)
Abstract

A theory of self-fields in a free-electron laser with a helical wiggler and ion-channel guiding is presented. The effects of self-electric and magnetic fields on electron trajectories are investigated. It is shown that, under the Budker condition, there is one group of orbits (group I) for which the wiggler-induced self-magnetic field is negative and acts as a diamagnetic correction to the wiggler magnetic field. The function $\Phi $ that determines the rate of change of axial velocity with energy in the presence of the self-fields is derived and studied numerically.

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Journal of Plasma Physics
  • ISSN: 0022-3778
  • EISSN: 1469-7807
  • URL: /core/journals/journal-of-plasma-physics
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