Plasma and Fusion Research

Volume 3, S1023 (2008)

Regular Articles

Measurement of Peripheral Plasma Turbulence Using a Fast Camera in Heliotron J
Nobuhiro NISHINO, Tohru MIZUUCHI1), Shinichi KOBAYASHI1), Kazunobu NAGASAKI1), Hiroyuki OKADA1), Fumimichi SANO1), Satoru YAMAMOTO2) and Katsumi KONDO3)
Graduate School of Engineering, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8527, Japan
1)
Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
2)
Kyoto University Pioneering Research Unit for Next Generation, Yoshida, Sakyo-ku 606-8501, Kyoto, Japan
3)
Graduate School of Energy Science, Kyoto University, Gokasho, Uji 606-0011, Japan
(Received 16 November 2007 / Accepted 3 March 2008 / Published 7 August 2008)

Abstract

Using a fast camera with tangential view, the motion of the filamentary structures in peripheral regions was observed. In the L-mode, the filamentary structures are relatively thinner than those of the H-mode. The direction of filamentary structure motion in the H-mode plasma was changed opposite to that in the L-mode plasma, and the motion speed was also doubled. During L-H transition, this motion was stopped. If this motion is poloidal rotation due to Er × B drift, Er should be positive in the L-mode plasma and negative in the H-mode plasma.

Keywords

turbulence, peripheral plasma, L-H transition, H-mode, Heliotron J, fast camera

DOI: 10.1585/pfr.3.S1023

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References

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This paper may be cited as follows:

Nobuhiro NISHINO, Tohru MIZUUCHI, Shinichi KOBAYASHI, Kazunobu NAGASAKI, Hiroyuki OKADA, Fumimichi SANO, Satoru YAMAMOTO and Katsumi KONDO, Plasma Fusion Res. 3, S1023 (2008).