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Dynamical behaviors of nonlinear dust acoustic waves: From plane waves to dust acoustic wave turbulence

Part of: Physics of Dusty Plasmas

Published online by Cambridge University Press:  25 June 2014

Ya-Yi Tsai ,
Mei-Chu Chang  and
Lin I.
Ya-Yi Tsai
Affiliation:
Department of Physics and Center for Complex Studies, National Central University, Jhongli, Taiwan 32001, Republic of China
Mei-Chu Chang
Affiliation:
Department of Physics and Center for Complex Studies, National Central University, Jhongli, Taiwan 32001, Republic of China
Lin I.*
Affiliation:
Department of Physics and Center for Complex Studies, National Central University, Jhongli, Taiwan 32001, Republic of China
*
†Email address for correspondence: lini@phy.ncu.edu.tw
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Abstract

The dust acoustic wave (DAW), associated with longitudinal dust oscillations in dusty plasmas, can be self-excited from the free energy of ion streaming. It is not only a fundamental plasma wave but also a paradigm to understand the generic dynamical behaviors of self-excited nonlinear longitudinal density waves through optically monitoring particle motion and dust density evolutions over a large area. In this paper, the dynamical behaviors of the wave-particle interaction and wave breaking in ordered self-excited DAW with straight wave fronts, and the defect-mediated wave turbulence with fluctuating defects and chaotic low amplitude hole filaments along defect trajectories in the 2+1D space-time space, are briefly reviewed. The first experimental observation of acoustic vortices with helical waveforms in self-excited acoustic-type defect-mediated wave turbulence, and the dynamics of spontaneous pair generation, propagation, and pair annihilation of acoustic vortices, is demonstrated and discussed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 80 , Issue 6 , December 2014 , pp. 809 - 816
Copyright
Copyright © Cambridge University Press 2014 

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