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Experimental Results for Electron Bernstein Wave Heating in the Large Helical Device

Hiroe IGAMI, Shin KUBO, Takashi SHIMOZUMA, Yasuo YOSHIMURA, Hiromi TAKAHASHI, Hiroshi IDEI¹⁾, Masaki NISHIURA, Shinya OGASAWARA²⁾, Ryohei MAKINO²⁾, Ryuhei KUMAZAWA, Takashi MUTOH, Akio SAGARA and Takuya GOTO

National Institute for Fusion Science, Toki 509-5292, Japan

1)

Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

2)

Department of Energy and Technology, Nagoya University, Nagoya 464-8463, Japan

(Received 12 December 2011 / Accepted 16 April 2012 / Published 13 September 2012)

Abstract

Electron cyclotron heating (ECH) using electron Bernstein waves (EBWs) was studied in the large helical device (LHD). Oblique launching of the slow extraordinary (SX-) mode from the high field side and oblique launching of the ordinary (O-) mode from the low field side were adopted to excite EBWs in the LHD by using electron cyclotron (EC) wave antennas installed apart from the plasma surface. Increases in the stored energy and electron temperature were observed for both cases of launching. These launching methods for ECH using EBWs (EBWH) is promising for high-density operation in future helical fusion devices instead of conventional ECH by normal electromagnetic modes.

Copyright (c) 2012 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

electron cyclotron heating, electron Bernstein wave, mode conversion process, high-density operation, heating in fusion device

DOI: 10.1585/pfr.7.2402110

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This paper may be cited as follows:

Hiroe IGAMI, Shin KUBO, Takashi SHIMOZUMA, Yasuo YOSHIMURA, Hiromi TAKAHASHI, Hiroshi IDEI, Masaki NISHIURA, Shinya OGASAWARA, Ryohei MAKINO, Ryuhei KUMAZAWA, Takashi MUTOH, Akio SAGARA and Takuya GOTO, Plasma Fusion Res. 7, 2402110 (2012).