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

  • S. Yoshimura (a1), K. Terasaka (a2), E. Tanaka (a2), M. Aramaki (a3), A. Okamoto (a4), K. Nagaoka (a1) and M. Y. Tanaka (a2)...

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.

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Corresponding author

Email address for correspondence: yshinji@nifs.ac.jp

References

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

  • S. Yoshimura (a1), K. Terasaka (a2), E. Tanaka (a2), M. Aramaki (a3), A. Okamoto (a4), K. Nagaoka (a1) and M. Y. Tanaka (a2)...

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