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New Power Records of Sub-Terahertz Gyrotron with Second-Harmonic Oscillation

Teruo SAITO, Shinya OGASAWARA¹⁾, Naoki YAMADA, Shinji IKEUCHI, Yoshinori TATEMATSU, Ryosuke IKEDA, Isamu OGAWA and Vladimir N. MANUILOV²⁾

Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan

1)

Department of Energy Engineering and Science, Nagoya University, Nagoya 464-8463, Japan

2)

Nizhny Novgorod State University, Nizhny Novgorod 603600, Russia

(Received 4 December 2011 / Accepted 13 December 2011 / Published 27 January 2012)

Abstract

High-power sub-terahertz pulse gyrotrons are under development in FIR FU for application to collective Thomson scattering (CTS) measurement on fusion plasmas, especially on high-density plasmas such as those produced in LHD. Recently, we achieved a new power record of 62 kW at approximately 388 GHz with second-harmonic (SH) oscillation. Following this result, we modified the electron gun of the gyrotron to couple the electron beam more strongly to another oscillation mode that has a peak coupling coefficient two times as large as that of the 62 kW mode. Oscillation tests with the new mode attained higher power of 83 kW at about 389 GHz. These results constitute new second-harmonic-oscillation power records for sub-terahertz gyrotrons.

Copyright (c) 2012 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

terahertz gyrotron, second-harmonic oscillation, single-mode oscillation, mode competition, collective Thomson scattering

DOI: 10.1585/pfr.7.1206003

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This paper may be cited as follows:

Teruo SAITO, Shinya OGASAWARA, Naoki YAMADA, Shinji IKEUCHI, Yoshinori TATEMATSU, Ryosuke IKEDA, Isamu OGAWA and Vladimir N. MANUILOV, Plasma Fusion Res. 7, 1206003 (2012).