Plasma and Fusion Research

Volume 12, 1206013 (2017)

Rapid Communications

Development of 300 GHz Band Gyrotron for Collective Thomson Scattering Diagnostics in the Large Helical Device
Teruo SAITO, Yuusuke YAMAGUCHI, Yoshinori TATEMATSU, Masafumi FUKUNARI, Takumi HIROBE, Shunsuke TANAKA, Ryuji SHINBAYASHI, Takashi SHIMOZUMA1), Shin KUBO1), Kenji TANAKA1) and Masaki NISHIURA2)
Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
1)
National Institute for Fusion Science, Toki 509-5292, Japan
2)
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwanoha 277-8561, Japan
(Received 21 February 2017 / Accepted 4 March 2017 / Published 24 March 2017)

Abstract

A 300 GHz pulse gyrotron has been developed for use in collective Thomson scattering (CTS) diagnostics in the Large Helical Device (LHD). Single-mode oscillation power of more than 320kW was produced. The radiation beam has a Gaussian pattern. The frequency spectrum is very narrow and stable across the pulse width. No competing mode was observed in the oscillation pulse, including during the turn-on and turn-off phases.

Keywords

gyrotron, sub-THz, collective Thomson scattering, LHD

DOI: 10.1585/pfr.12.1206013

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