[Table of Contents]

Plasma and Fusion Research

Volume 8, 1205165 (2013)

Rapid Communications


Experiment for Over 200 kW Oscillation of a 295 GHz Pulse Gyrotron
Yuusuke YAMAGUCHI, Teruo SAITO, Yoshinori TATEMATSU, Shinji IKEUCHI, Jun KASA, Masaki KOTERA, Isamu OGAWA, Toshitaka IDEHARA, Shin KUBO1), Takashi SHIMOZUMA1), Masaki NISHIURA1) and Kenji TANAKA1)
Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 7 October 2013 / Accepted 26 October 2013 / Published 27 December 2013)

Abstract

A high-power sub-THz gyrotron is under development as a power source of collective Thomson scattering diagnostic of fusion plasmas. It operates at a fundamental harmonic frequency of 295 GHz. A cavity which realizes stable and efficient single mode oscillation, an electron gun with an intense laminar electron beam, and an internal mode convertor are designed. A maximum oscillation power of 234 kW is achieved with a Gaussian like radiation pattern. The duration of 130 kW pulse is extended up to 30 microseconds, which is limited by the configuration of power supply.


Keywords

gyrotron, collective Thomson scattering, Large Helical Device

DOI: 10.1585/pfr.8.1205165


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This paper may be cited as follows:

Yuusuke YAMAGUCHI, Teruo SAITO, Yoshinori TATEMATSU, Shinji IKEUCHI, Jun KASA, Masaki KOTERA, Isamu OGAWA, Toshitaka IDEHARA, Shin KUBO, Takashi SHIMOZUMA, Masaki NISHIURA and Kenji TANAKA, Plasma Fusion Res. 8, 1205165 (2013).