Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Regular Articles
Surface Waves in Oversized G-Band Slow-Wave Structures with Rectangular Corrugations
Kazuo OGURAAkihiko KOJIMAFumiaki KAWABEKiyoyuki YAMBEMd. Ruhul AMIN
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2014 Volume 9 Pages 3406022

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Abstract

Surface waves in oversized G-band slow-wave structure with rectangularly corrugated wall are analyzed numerically. The inner corrugation generates cylindrical surface wave. The outer corrugation also generates transverse magnetic surface wave. The upper cut-offs of surface waves are controlled by corrugation amplitude. In excitation of the surface waves by an annular electron beam, the slow cyclotron interaction as well as the Cherenkov interaction occur due to there-dimensional beam perturbations. The slow cyclotron interaction merges with the Cherenkov interaction at lower magnetic field. The merged growth rate is enhanced by 13% as compared to the isolated Cherenkov growth rate. The surface waves on inner and outer corrugations can have different frequencies and can be excited selectively by adjusting the beam radius of the electron beam.

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© 2014 by The Japan Society of Plasma Science and Nuclear Fusion Research
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