[Table of Contents]

Plasma and Fusion Research

Volume 3, S1080 (2008)

Regular Articles

Efficient Heating at the Third-Harmonic Electron Cyclotron Resonance in the Large Helical Device
Takashi SHIMOZUMA, Shin KUBO, Hiroe IGAMI, Yasuo YOSHIMURA, Takashi NOTAKE1), Nikolai B. MARUSHCHENKO2), Yurij TURKIN2), Takashi MUTOH and the LHD Experimental Group
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
University of Fukui, Research Center for Development of Far-Infrared Region, 3-9-1 Bunkyo, Fukui 910-8507, Japan
Max-Plank-Institut für Plasmaphysik, EURATOM-Association, Wendelsteinstr. 1, D-17491 Greifswald, Germany
(Received 16 November 2007 / Accepted 4 March 2008 / Published 1 August 2008)


Efficient heating at the third-harmonic electron cyclotron resonance was attained by injection of millimeterwave power with 84 GHz frequency range at the magnetic field strength of 1 T in LHD. The electron temperature at the plasma center clearly increased, and the increment in the temperature reached 0.2-0.3 keV. The dependence of the power absorption rate on the antenna focal position was investigated experimentally, showing that the optimum position was located in the slightly high-field side of the resonance layer. Ray-tracing calculation was performed in the realistic three-dimensional magnetic configuration, and its results are compared with the experimental results.


electron cyclotron resonance heating, gyrotron, harmonic resonance, quasi optical antenna, ray tracing

DOI: 10.1585/pfr.3.S1080


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This paper may be cited as follows:

Takashi SHIMOZUMA, Shin KUBO, Hiroe IGAMI, Yasuo YOSHIMURA, Takashi NOTAKE, Nikolai B. MARUSHCHENKO, Yurij TURKIN, Takashi MUTOH and the LHD Experimental Group, Plasma Fusion Res. 3, S1080 (2008).