Plasma and Fusion Research

Volume 5, S2091 (2010)

Regular Articles

Numerical Analysis of Slow-Wave Instabilities in an X-Band Sinusoidally Corrugated Waveguide with Coaxial Slow-Wave Structure

Shingo ABE, Kazuo OGURA, Kosuke OTUBO and Hiroki KIMURA

: Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan

(Received 9 December 2009 / Accepted 16 March 2010 / Published 10 December 2010)

Abstract

The dispersion characteristics and slow-wave instabilities of a sinusoidally corrugated waveguide with coaxial slow-wave structure (SWS) are analyzed. In SWS, a central cylindrical conductor is surrounded by an outer cylindrical conductor. Sinusoidal corrugation is formed on either conductor or both conductors. The corrugation parameters are those used for an X-band SWS. The relative phase between the sinusoidal corrugations on the inner and outer conductors affects the dispersion characteristics. Instabilities due to beam interactions with the slow -waves are examined by considering three-dimensional beam perturbations. The slow cyclotron instability occurs in addition to the Cherenkov instability, since transverse as well as longitudinal perturbations are included.

Keywords

coaxial slow-wave structure, backward wave oscillator, surface wave, slow cyclotron instability, Cherenkov instability

DOI: 10.1585/pfr.5.S2091

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This paper may be cited as follows:

Shingo ABE, Kazuo OGURA, Kosuke OTUBO and Hiroki KIMURA, Plasma Fusion Res. 5, S2091 (2010).