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Surface Waves in Oversized G-Band Slow-Wave Structures with Rectangular Corrugations

Kazuo OGURA, Akihiko KOJIMA, Fumiaki KAWABE, Kiyoyuki YAMBE and Md. Ruhul AMIN¹⁾

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

1)

Department of Electrical and Electronic Engineering, Islamic University of Technology, Gazipur 1704, Bangladesh

(Received 6 December 2013 / Accepted 1 February 2014 / Published 14 March 2014)

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.

Copyright (c) 2014 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

oversized coaxial slow-wave structure, G-band, surface wave, Cherenkov interaction, slow cyclotron interaction, there-dimensional beam perturbation

DOI: 10.1585/pfr.9.3406022

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This paper may be cited as follows:

Kazuo OGURA, Akihiko KOJIMA, Fumiaki KAWABE, Kiyoyuki YAMBE and Md. Ruhul AMIN, Plasma Fusion Res. 9, 3406022 (2014).