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Paper   IPM / Physic / 6652
School of Physics
  Title:   Dispresion Characteristics of Waves in A Waveguife with An Annular Plasma Column
1.  S. Mirzanejhad
2.  B. Maraghechi
  Status:   Published
  Journal: Phys. Plasmas
  No.:  55
  Vol.:  5
  Year:  1998
  Pages:   4070-4078
  Supported by:  IPM
A detailed analysis of waves in a cylindrical waveguide containing an annular plasma column is presented. Dispersion relations for four families of electromagnetic and electrostatic modes are derived and solved numerically to study the characteristics of azimuthally symmetrical and nonsymmetrical eigenmodes. The general result which is obtained for the annular plasma is reduced to be used for the thin annular and solid configurations. Figures are presented to illustrate the dependence of frequencies on the plasma radii and the cyclotron frequency. Interaction of the dispersion curves of HE waveguide modes with cyclotron modes is demonstrated graphically. The presented results may be used in the studies of free-electron type devices for generation of high-power electromagnetic radiation.

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