Plasma and Fusion Research

Volume 7, 1202153 (2012)

Rapid Communications

Experimental Study of Plasma Breakdown by Toroidally Injected Electron Cyclotron Waves in Heliotron J
Bo LU, Kazunobu NAGASAKI1), Tohru MIZUUCHI1), Hiroyuki OKADA1), Takashi MINAMI1), Shinji KOBAYASHI1), Satoshi YAMAMOTO1), Shinsuke OHSHIMA1), Shigeru KONOSHIMA1) and Fumimichi SANO1)
Center for Fusion Science, Southwestern Institute of Physics, P.O.Box 432, Chengdu, Sichuan, 610041, China
1)
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
(Received 22 May 2012 / Accepted 5 October 2012 / Published 22 November 2012)

Abstract

Plasma breakdown using electron cyclotron waves with toroidally inclined launch has been studied experimentally in the stellarator/heliotron device, Heliotron J. The experimental results show that the second harmonic X-mode breakdown has a weak dependence on the parallel refractive index, N∥, for the small toroidal injection angle range. When the fundamental resonance exists inside the vacuum chamber, the breakdown occurs quickly, independent of the toroidal injection angle.

Keywords

breakdown, ECH, stellarator/heliotron, Heliotron J

DOI: 10.1585/pfr.7.1202153

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This paper may be cited as follows:

Bo LU, Kazunobu NAGASAKI, Tohru MIZUUCHI, Hiroyuki OKADA, Takashi MINAMI, Shinji KOBAYASHI, Satoshi YAMAMOTO, Shinsuke OHSHIMA, Shigeru KONOSHIMA and Fumimichi SANO, Plasma Fusion Res. 7, 1202153 (2012).