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Effect of Oversized Factor on 0.1 THz Surface Wave Oscillator

Yuta ANNAKA, Kazuo OGURA¹⁾, Mao AOKI¹⁾, Shingo HAMADA¹⁾, Tsubasa KATO¹⁾ and Masaya ITO¹⁾

Faculty of Engineering, Niigata University, Niigata 950-2181, Japan

1)

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

(Received 7 January 2022 / Accepted 23 February 2022 / Published 22 April 2022)

Abstract

Surface wave oscillator (SWO) is an intense subterahertz wave source based on the interaction of an electron beam with a surface wave in a cylindrical corrugated waveguide (CCW). The oversized factor is a key parameter of SWO and is the ratio of the CCW diameter to the wavelength of a generated wave. In this study, we experimentally examine 0.1 THz SWO with different oversized factors of 10 and 7. For an oversized factor of 7, a kilowatt class radiation with a maximum efficiency of 8% is observed. SWO operation can be improved by decreasing the factor from 10 to 7.

Copyright (c) 2022 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

surface wave oscillator, oversized factor, intense terahertz radiation, electron beam device

DOI: 10.1585/pfr.17.2406036

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