Plasma and Fusion Research

Volume 3, S1076 (2008)

Regular Articles

Experimental Conditions for Electron Bernstein Wave Heating Using EC Waves Injected from High-Field Side in CHS

Yasuo YOSHIMURA, Kazunobu NAGASAKI¹⁾, Sergi FERRANDO-MARGALET, Tsuyoshi AKIYAMA, Mitsutaka ISOBE, Akihiro SHIMIZU, Chihiro SUZUKI, Chihiro TAKAHASHI, Kenichi NAGAOKA, Shin NISHIMURA, Takashi MINAMI, Keisuke MATSUOKA, Shoichi OKAMURA, CHS group, Shin KUBO, Takashi SHIMOZUMA, Hiroe IGAMI, Hiromi TAKAHASHI and Takashi MUTOH

National Institute for Fusion Science, Toki 509-5292, Japan
1): Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan

(Received 16 November 2007 / Accepted 13 February 2008 / Published 1 August 2008)

Abstract

In the compact helical system (CHS), electron heating by electron Bernstein waves (EBWs) was experimentally investigated to study a technique for high-density plasma heating over cutoff density. The EBWs are excited through a mode conversion process by X-mode waves injected to plasmas from the high-field side. In the experiment, within the range of an oblique EC-wave beam injection angle, evident heating effect was observed. The dependences of the heating effect on the wave's toroidal injection direction and polarization show that the absorption of the mode-converted EBWs should be the cause of the plasma heating effect.

Keywords

electron Bernstein wave, EBW, slow X-B, high-density plasma heating, high-field side injection, ECH, CHS

DOI: 10.1585/pfr.3.S1076

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This paper may be cited as follows:

Yasuo YOSHIMURA, Kazunobu NAGASAKI, Sergi FERRANDO-MARGALET, Tsuyoshi AKIYAMA, Mitsutaka ISOBE, Akihiro SHIMIZU, Chihiro SUZUKI, Chihiro TAKAHASHI, Kenichi NAGAOKA, Shin NISHIMURA, Takashi MINAMI, Keisuke MATSUOKA, Shoichi OKAMURA, CHS group, Shin KUBO, Takashi SHIMOZUMA, Hiroe IGAMI, Hiromi TAKAHASHI and Takashi MUTOH, Plasma Fusion Res. 3, S1076 (2008).