[Table of Contents]

Plasma and Fusion Research

Volume 5, S2002 (2010)

Review Articles


Turbulence and Structure Formation Associated with Vortex Dynamics in Non-Neutral Plasma Flow
Yasuhito KIWAMOTO1,2), Yosuke KAWAI1), Yukihiro SOGA1,3) and Jun AOKI1,4)
1)
Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-850, Japan
2)
Professor Emeritus, Kyoto University
3)
School of Mathematics and Physics, Kanazawa University, Kanazawa-shi 920-1192, Japan
4)
Graduate Shcool of Science, Osaka University, Toyonaka-shi 560-0043, Japan
(Received 6 December 2009 / Accepted 22 January 2010 / Published 10 December 2010)

Abstract

We discuss generation processes of two distinct structures, ordered arrays of high density clumps and single-peaked macroscopic structures as observed in relaxation processes starting from non-equilibrium distributions of strongly magnetized pure electron plasmas. The two-dimensional character of the guiding-center system shows equivalence between the distributions of electron density and the vorticity in E×B flow. Observations reveal decisive role of fluctuations in the ambient electrons in assisting the formation of ordered arrays and their destruction that successively leads to next stage of ordered structures. The fluctuating parts extracted via wavelet analyses show characteristic features of spectrum and k-space dynamics in ideal 2D turbulence. Such dynamics interpreted as ideal 2D fluid actually reflect electromagnetic dynamism of charged particle subject to redistribution of potential energy and angular momentum. One extra feature of 2D vortex dynamics of electrons is the contribution of Landau-damping of collective particles' motion which conveys externally applied electromagnetic field to the bulk electrons via resonant electrons as a source of energy and momentum.


Keywords

non-neutral plasma, vortex dynamics, vortex crystal, structure formation, turbulence, enstrophy cascade, wavelet analysis, Landau-damping

DOI: 10.1585/pfr.5.S2002


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This paper may be cited as follows:

Yasuhito KIWAMOTO, Yosuke KAWAI, Yukihiro SOGA and Jun AOKI, Plasma Fusion Res. 5, S2002 (2010).