[Table of Contents]

Plasma and Fusion Research

Volume 5, S1007 (2010)

Regular Articles

Steady-State Operation Scenario and the First Experimental Result on QUEST
Kazuaki HANADA, Kohnosuke SATO, Hideki ZUSHI, Kazuo NAKAMURA, Mizuki SAKAMOTO, Hiroshi IDEI, Makoto HASEGAWA, Yuichi TAKASE1), Osamu MITARAI2), Takashi MAEKAWA3), Yasuaki KISHIMOTO3), Masaki ISHIGURO4), Tomokazu YOSHINAGA5), Hiroe IGAMI5), Nobuhiro NISHINO6), Hiroshi HONMA4), Shoji KAWASAKI, Hisatoshi NAKASHIMA, Aki HIGASHIJIMA, Yuta HIGASHIZONO, Akira ANDO7), Nobuyuki ASAKURA8), Akira EJIRI1), Yoshihiko HIROOKA5), Akio ISHIDA9), Akio KOMORI5), Makoto MATSUKAWA8), Osamu MOTOJIMA5), Yuichi OGAWA1), Noriyasu OHNO10), Yasushi ONO1), Martin PENG11), Shigeru SUDO5), Hiroshi YAMADA5), Naoaki YOSHIDA and Zensho YOSHIDA1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
1)
University of Tokyo, Kashiwa, Chiba 277-8561, Japan
2)
Tokai University, Kumamoto 862-8652, Japan
3)
Kyoto University, Kyoto 606-8502, Japan
4)
IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
5)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
6)
Hiroshima University, Higashihiroshima, Hiroshima 739-8527, Japan
7)
Tohoku University, Sendai, Miyagi 980-8579, Japan
8)
Japan Atomic Energy Agency, Naka, Ibaragi 311-0193, Japan
9)
Niigata University, Niigata 950-2181, Japan
10)
Nagoya University, Nagoya, Aichi 464-8603, Japan
11)
Oak Ridge National Laboratoty, Oak Ridge, TN 37831, USA
(Received 9 January 2009 / Accepted 8 July 2009 / Published 26 March 2010)

Abstract

QUEST focuses on the steady state operation of the spherical tokamak by controlled PWI and electron Bernstein wave current drive. One of the main purposes of QUEST is an achievement of long duration discharge with MW-class injected power. As the result, QUEST should be operated in the challenging region on heat and particle handling. To do the particle handling, high temperature all metal wall up to 623 K and closed divertors are planned, which is to realize the steady-state operation under recycling ratio, R = 1. This is a dispensable check to DEMO, because wall pumping should be avoided as possible in the view of tritium retention. The QUEST project will be developed in increment step such as, I. low β steady state operation in limiter configuration, II. low β steady state operation in divertor configuration, III. relatively high β steady state operation in closed divertor configuration. Phase I in the project corresponds to these two years, and final goal of phase I is to make full current drive plasma up to 20 kA. Closed divertor will be designed and tested in the Phase II. QUEST is running from Oct., 2008 and the first results are introduced.

Keywords

steady state operation, spherical tokamak, electron Bernstein wave, plasma wall interaction

DOI: 10.1585/pfr.5.S1007

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This paper may be cited as follows:

Kazuaki HANADA, Kohnosuke SATO, Hideki ZUSHI, Kazuo NAKAMURA, Mizuki SAKAMOTO, Hiroshi IDEI, Makoto HASEGAWA, Yuichi TAKASE, Osamu MITARAI, Takashi MAEKAWA, Yasuaki KISHIMOTO, Masaki ISHIGURO, Tomokazu YOSHINAGA, Hiroe IGAMI, Nobuhiro NISHINO, Hiroshi HONMA, Shoji KAWASAKI, Hisatoshi NAKASHIMA, Aki HIGASHIJIMA, Yuta HIGASHIZONO, Akira ANDO, Nobuyuki ASAKURA, Akira EJIRI, Yoshihiko HIROOKA, Akio ISHIDA, Akio KOMORI, Makoto MATSUKAWA, Osamu MOTOJIMA, Yuichi OGAWA, Noriyasu OHNO, Yasushi ONO, Martin PENG, Shigeru SUDO, Hiroshi YAMADA, Naoaki YOSHIDA and Zensho YOSHIDA, Plasma Fusion Res. 5, S1007 (2010).