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Experimental Study of Oversized Backward Wave Oscillator with Coaxial Slow-Wave Structure

Hiroyuki YOSHIMURA, Kazuo OGURA, Kiyoshi BANSHO, Hiroshi IIDUKA, Masatoh TAKAHASHI and Akira SUGAWARA

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

(Received 9 December 2009 / Accepted 31 March 2010 / Published 10 December 2010)

Abstract

Studies of coaxial oversized backward wave oscillators (BWOs) are reported. The beam voltage is weakly relativistic (less than 100 kV). The slow-wave structure consists of a periodically corrugated oversized waveguide and periodically corrugated inner conductor, whose target operating frequency due to Cherenkov interaction is in the K-band. A starting energy exists for the coaxial oversized BWO as it does for a hollow oversized BWO. The coaxial slow-wave structure has two surface wave modes caused by the inner and outer corrugations. Operation based on these surface modes can be controlled by the beam diameter. The phase difference between the inner and outer corrugations has little effect on operation of the oversized BWO.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

oversized backward wave oscillator, weakly relativistic region, periodical corrugation, coaxial slow-wave structure

DOI: 10.1585/pfr.5.S2093

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This paper may be cited as follows:

Hiroyuki YOSHIMURA, Kazuo OGURA, Kiyoshi BANSHO, Hiroshi IIDUKA, Masatoh TAKAHASHI and Akira SUGAWARA, Plasma Fusion Res. 5, S2093 (2010).