Plasma and Fusion Research

Volume 7, 2401054 (2012)

Regular Articles

Time Evolution of Power Spectrum Density in Spontaneous Transition in Cylindrical Magnetized Plasma
Tatsuya KOBAYASHI1), Shigeru INAGAKI2,3), Stella OLDENBÜRGER3), Katsuyuki KAWASHIMA1), Noriko OHYAMA1), Yuuki TOBIMATSU1), Hiroyuki ARAKAWA4), Makoto SASAKI2,3), Yoshihiko NAGASHIMA2,3), Takuma YAMADA3,5), Satoru SUGITA2), Masatoshi YAGI2,3,4), Naohiro KASUYA3,6), Akihide FUJISAWA2,3), Sanae-I. ITOH2,3) and Kimitaka ITOH1,3,6)
1)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
2)
Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
3)
Itoh Research Center for Plasma Turbulence, Kyushu University, Fukuoka 816-8580, Japan
4)
Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
5)
Graduate School of Frontier Sciences, The University of Tokyo, Tokyo 277-8561, Japan
6)
National Institute for Fusion Science, Gifu 509-5292, Japan
(Received 5 December 2011 / Accepted 27 March 2012 / Published 07 June 2012)

Abstract

Preliminary observation results are reported for a new discharge regime in the Plasma Assembly for Nonlinear Turbulent Analysis (PANTA), where spontaneous transitions in the equilibrium profile and fluctuation spectra occur. Two different states are defined by using the mean density value. Axial and radial profiles are observed for the two states, and large profile changes are found. The spatiotemporal evolution of the transition front is measured. Changes in the fluctuation spectrum are evaluated using conditional average and lock-in average.

Keywords

linear plasma, drift wave, turbulence, transition phenomena

DOI: 10.1585/pfr.7.2401054

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This paper may be cited as follows:

Tatsuya KOBAYASHI, Shigeru INAGAKI, Stella OLDENBÜRGER, Katsuyuki KAWASHIMA, Noriko OHYAMA, Yuuki TOBIMATSU, Hiroyuki ARAKAWA, Makoto SASAKI, Yoshihiko NAGASHIMA, Takuma YAMADA, Satoru SUGITA, Masatoshi YAGI, Naohiro KASUYA, Akihide FUJISAWA, Sanae-I. ITOH and Kimitaka ITOH, Plasma Fusion Res. 7, 2401054 (2012).