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Effects of Rotating Magnetic Islands Driven by External Perturbation Fields in the TU-Heliac

Sumio KITAJIMA, Hajime UMETSU, Mamiko SASAO, Atsushi OKAMOTO, Takashi KOBUCHI, Yutaka TANAKA, Hiroyasu UTOH, Hiroshi AOYAMA, Keisuke IWAZAKI, Shigeru INAGAKI¹⁾, Masakazu TAKAYAMA²⁾, Akio KOMORI³⁾, Kiyohiko NISHIMURA³⁾, Yasuhiro SUZUKI³⁾, Masayuki YOKOYAMA³⁾ and Hiromi TAKAHASHI³⁾

Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan

1)

Research Institute for Applied Mechanics Kyushu University, 6-1 Kasuga-kouen, Kasuga, Fukuoka 816-8580, Japan

2)

Akita Prefectural University, Honjyo, Akita 015-0055, Japan

3)

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

(Received 16 November 2007 / Accepted 5 March 2008 / Published 6 August 2008)

Abstract

A new method for rotating magnetic islands by external perturbation fields is proposed. In the experiments, perturbation fields were produced using four pairs of cusp field coil, in which alternating currents having a π/2 phase shift flowed. A phase shifter for the coil currents was designed and constructed. The phase difference in the floating potential signals measured using two Langmuir probes confirmed that the magnetic islands rotated in the counterclockwise direction (c/cw). The clockwise (cw) rotation was also observed in the plasma biased by the hot cathode electrode. These experimental results suggest the ability of producing plasma poloidal rotation driven by rotating islands.

Copyright (c) 2008 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

stellarator, heliac, magnetic island, poloidal rotation, perturbation field, electrode bias.

DOI: 10.1585/pfr.3.S1027

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References

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This paper may be cited as follows:

Sumio KITAJIMA, Hajime UMETSU, Mamiko SASAO, Atsushi OKAMOTO, Takashi KOBUCHI, Yutaka TANAKA, Hiroyasu UTOH, Hiroshi AOYAMA, Keisuke IWAZAKI, Shigeru INAGAKI, Masakazu TAKAYAMA, Akio KOMORI, Kiyohiko NISHIMURA, Yasuhiro SUZUKI, Masayuki YOKOYAMA and Hiromi TAKAHASHI, Plasma Fusion Res. 3, S1027 (2008).