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Experimental Study on G-Band Oversized Backward Wave Oscillator Driven by Weakly Relativistic Electron Beam

Shota MAGORI, Kazuo OGURA, Takayuki IWASAKI, Junpei KOJIMA, Kiyoyuki YAMBE, Shin KUBO¹⁾, Takashi SHIMOZUMA¹⁾, Sakuji KOBAYASHI¹⁾ and Kohji OKADA¹⁾

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

1)

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

(Received 6 December 2013 / Accepted 3 February 2014 / Published 7 April 2014)

Abstract

We studied a G-band oversized backward wave oscillator (BWO) driven by a weakly relativistic electron beam of less than 100 kV. Rectangular corrugations are used as slow-wave structures having surface waves with upper cutoff frequencies above 150 GHz (G-band). We examine how dispersion characteristics of surface waves are affected by accuracy in machining the corrugation amplitude, width, and period length. Of these, accuracy in the amplitude has the largest effect. Uniformly distributed annular electron beams are generated by a disk-type cold cathode and injected into the G-band BWO. G-band BWO operations in 137 - 173 GHz and above 173 GHz are achieved by changing the corrugation amplitude. The radiation patterns are fairly broad, and the estimated radiation power is at kW level.

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

Keywords

oversized backward wave oscillator, weakly relativistic electron beam, cold cathode, slow-wave structure, rectangular corrugation, G-band

DOI: 10.1585/pfr.9.3406032

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This paper may be cited as follows:

Shota MAGORI, Kazuo OGURA, Takayuki IWASAKI, Junpei KOJIMA, Kiyoyuki YAMBE, Shin KUBO, Takashi SHIMOZUMA, Sakuji KOBAYASHI and Kohji OKADA, Plasma Fusion Res. 9, 3406032 (2014).