Plasma and Fusion Research

Volume 12, 1202020 (2017)

Rapid Communications

Current Start-Up Using the New CHI System
Kengoh KURODA, Roger RAMAN1), Kazuaki HANADA, Makoto HASEGAWA, Takumi ONCHI, Masayuki ONO2), Thomas JABOE1), Brian A. NELSON1), Masayoshi NAGATA3), Osamu MITARAI4), Kazuo NAKAMURA, Hiroshi IDEI, John ROGERS1), Shoji KAWASAKI, Takahiro NAGATA, Arseniy KUZMIN, Shinichiro KOJIMA, Osamu WATANABE, Aki HIGASHIJIMA, Yuichi TAKASE5) and Atsushi FUKUYAMA6)
Kyushu University, Kasuga, Fukuoka 816-8580, Japan
1)
University of Washington, Seattle, WA 98195, USA
2)
Princeton University, Princeton, NJ 08543, USA
3)
University of Hyogo, Himeji, Hyogo 671-2280, Japan
4)
Institute for Advanced Fusion and Physics Education, Kita-ku, Kumamoto 861-5525, Japan
5)
University of Tokyo, Kashiwa, Chiba 277-8561, Japan
6)
Kyoto University, Kyoto 606-8502, Japan
(Received 2 March 2017 / Accepted 24 March 2017 / Published 17 April 2017)

Abstract

Coaxial Helicity Injection (CHI) has now been implemented in QUEST. The goals for the first transient CHI experiments were to establish reliable gas breakdown conditions, and to measure CHI-produced toroidal current generation. Both these objectives were successfully met. Toroidal currents up to 29 kA were measured. Interestingly, these first plasmas on QUEST also suggest the formation of small amounts of closed magnetic flux surfaces.

Keywords

non-inductive current drive, CHI, spherical tokamak, solenoid free fusion plant, ECH

DOI: 10.1585/pfr.12.1202020

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Publisher's Note

This article has an erratum: Kengoh KURODA et al., Plasma Fusion Res. 12, 1902026 (2016).