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First Observation of ECH by Electron Bernstein Waves Excited via X-B Mode Conversion Process in LHD

Hiroe IGAMI, Takashi SHIMOZUMA, Shin KUBO, Kazunobu NAGASAKI¹⁾, Shigeru INAGAKI, Yasuo YOSHIMURA, Takashi NOTAKE, Kunizo OHKUBO, Takashi MUTOH and LHD experimental group

National Institute for Fusion Science

1)

Institute of Advanced Energy, Kyoto University

(Received 1 August 2006 / Accepted 20 September 2006 / Published 7 November 2006)

Abstract

In a magnetic field configuration of the Large Helical Device (LHD), when the extraordinary mode (X-mode) waves are obliquely injected from a bottom antenna, it can directly access the upper hybrid resonance (UHR) layer from the high field side and excite electron Bernstein waves (EBWs) without the need for any additional reflecting mirror antenna. A localized power absorption is observed in the low field side of the electron cyclotron resonance (ECR) layer. This result suggests electron cyclotron heating (ECH) by mode converted EBWs excited via X-B mode conversion process.

Copyright (c) 2006 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

electron cyclotron heating, electron Bernstein wave, power modulation, FFT analysis

DOI: 10.1585/pfr.1.052

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References

• [1] K. Nagasaki and N. Yanagi, Plasma Phys. Control. Fusion 44, 409 (2002).
• [2] T. Maekawa et al., Phys. Rev. Lett. 86, 3783 (2001).

This paper may be cited as follows:

Hiroe IGAMI, Takashi SHIMOZUMA, Shin KUBO, Kazunobu NAGASAKI, Shigeru INAGAKI, Yasuo YOSHIMURA, Takashi NOTAKE, Kunizo OHKUBO, Takashi MUTOH and LHD experimental group, Plasma Fusion Res. 1, 052 (2006).