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Exploration of spontaneous vortex formation and intermittent behavior in ECR plasmas: The HYPER-I experiments

Part of: Experiments Fundamental Plasma Physics

Published online by Cambridge University Press:  08 December 2014

S. Yoshimura ,
K. Terasaka ,
E. Tanaka ,
M. Aramaki ,
A. Okamoto ,
K. Nagaoka  and
M. Y. Tanaka
S. Yoshimura*
Affiliation:
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
K. Terasaka
Affiliation:
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
E. Tanaka
Affiliation:
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
M. Aramaki
Affiliation:
College of Industrial Technology, Nihon University, Narashino 275-8575, Japan
A. Okamoto
Affiliation:
Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan
K. Nagaoka
Affiliation:
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
M. Y. Tanaka
Affiliation:
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
*
†Email address for correspondence: [email protected]
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Abstract

HYPER-I (High Density Plasma Experiment-I) is a linear device that combines a wide operation range of plasma production with flexible diagnostics. The plasmas are produced by the electron cyclotron resonance (ECR) heating with parallel injection of right-handed circularly polarized microwaves of 2.45 GHz from the high-field side. The maximum attainable electron density is more than two orders of magnitude higher than the cutoff density of ordinary waves. Spontaneous formation of a variety of large-scale flow structures, or vortices, has been observed in the HYPER-I plasmas. Flow-velocity field measurements using directional Langmuir probes (DLPs) and laser-induced fluorescence (LIF) method have clarified the physical processes behind such vortex formations. Recently, a new intermittent behavior of local electron temperature has also been observed. Statistical analysis of the floating potential changes has revealed that the phenomenon is characterized by a stationary Poisson process.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 2 , April 2015 , 345810204
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Copyright
Copyright © Cambridge University Press 2014 

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