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Title: Particular Threshold Behavior of Dusty Plasma Instabilities

Abstract

We show that some experimentally observed instabilities, concerning the void region of a dust cloud, are similar to oscillations obtained in chemical systems or neuronal dynamics. The time evolution of these instabilities follows a well-defined process particularly visible in the instability shape and frequency.

Authors:
; ; ; ;  [1]
  1. GREMI, UMR6606 CNRS-Universite d'Orleans, 14 rue d'Issoudun, BP6744, 45067 Orleans Cedex 2 (France)
Publication Date:
OSTI Identifier:
21251317
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1041; Journal Issue: 1; Conference: 5. international conference on the physics of dusty plasmas, Ponta Degada, Azores (Portugal), 18-23 May 2008; Other Information: DOI: 10.1063/1.2997274; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DRIFT INSTABILITY; DUSTS; MAGNETOHYDRODYNAMICS; OSCILLATIONS; PLASMA; PLASMA WAVES; RF SYSTEMS; VOIDS

Citation Formats

Mikikian, M., Cavarroc, M., Coueedel, L., Tessier, Y., and Boufendi, L. Particular Threshold Behavior of Dusty Plasma Instabilities. United States: N. p., 2008. Web. doi:10.1063/1.2997274.
Mikikian, M., Cavarroc, M., Coueedel, L., Tessier, Y., & Boufendi, L. Particular Threshold Behavior of Dusty Plasma Instabilities. United States. doi:10.1063/1.2997274.
Mikikian, M., Cavarroc, M., Coueedel, L., Tessier, Y., and Boufendi, L. 2008. "Particular Threshold Behavior of Dusty Plasma Instabilities". United States. doi:10.1063/1.2997274.
@article{osti_21251317,
title = {Particular Threshold Behavior of Dusty Plasma Instabilities},
author = {Mikikian, M. and Cavarroc, M. and Coueedel, L. and Tessier, Y. and Boufendi, L.},
abstractNote = {We show that some experimentally observed instabilities, concerning the void region of a dust cloud, are similar to oscillations obtained in chemical systems or neuronal dynamics. The time evolution of these instabilities follows a well-defined process particularly visible in the instability shape and frequency.},
doi = {10.1063/1.2997274},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1041,
place = {United States},
year = 2008,
month = 9
}
  • Previous absolute instability results for significant growth from a parametric instability involving oppositely directed modes coupled by a uniform pump with phase inflection coupling (..delta..k = k''x/sup 2//2) are extended to higher modes and to thresholds. The results are applied to stimulated Raman scattering experiments done with exploding foils.
  • Low frequency drift instabilities are investigated in a dusty magnetized plasma with negatively charged grains in which locally there is an electron density gradient which is opposite in sign to a dust density gradient. Frequencies less than the ion gyrofrequency but much larger than the dust gyrofrequency are considered. Two different equilibria are considered that are characterized by {rho}{sub {ital d}}{lt_or_gt}{ital L}{sub {ital nd}}, where {rho}{sub {ital d}} is the dust gyroradius and {ital L}{sub {ital nd}} is the dust density scale length. Instabilities analogous to the universal instability and to the lower-hybrid-drift instability (with the lower-hybrid frequency in thismore » case associated with the dust) are investigated. Possible applications to dusty space plasmas such as the spoke regions of Saturn{close_quote}s B-ring are discussed. {copyright} {ital 1996 American Institute of Physics.}« less
  • Instabilities of dust acoustic waves in a plasma with a significant background pressure of neutrals have been investigated. A long wavelength mode is found to be unstable due to recombination of electrons and ions on the surface of dust particles. At short wavelengths, a dissipative instability driven by relative drift between ions and the dust particles is found to be important. Nonlinearly, the short wavelength modes lead to the formation of K{minus}dV solitons whereas the long wavelength end is dominated by modulational instabilities. {copyright} {ital 1997} {ital The American Physical Society}
  • Dust particles in a plasma acquire negative charges by capturing electrons. If the dust particle density is high, a huge loss of free electrons can trigger unstable behaviors in the plasma. Several types of plasma behaviors are analyzed thanks to a high-speed camera like dust particle growth instabilities (DPGI) and a new phenomenon called plasma spheroids. These small plasma spheroids are about a few mm, have a slightly enhanced luminosity, and are observed in the vicinity of the electrodes. Different behaviors are identified for these spheroids like a rotational motion, or a chaotic regime (fast appearance and disappearance).
  • A pair of low-frequency electrostatic modes, which are very similar to those experimentally observed by Praburam and Goree [Phys. Plasmas 3, 1212 (1996)], are found to exist in a dusty plasma with a significant background neutral pressure and background ion streaming. One of these two modes is the dust-acoustic mode and the other one is a new mode which is due to the combined effects of the ion streaming and ion--neutral collisions. It has been shown that in the absence of the ion streaming, the dust-acoustic mode is damped due to the combined effects of the ion--neutral and dust--neutral collisionsmore » and the electron--ion recombination onto the dust grain surface. This result disagrees with Kaw and Singh [Phys. Rev. Lett. 79, 423 (1997)], who reported collisional instability of the dust-acoustic mode in such a dusty plasma. It has also been found that a streaming instability with the growth rate of the order of the dust plasma frequency is triggered when the background ion streaming speed relative to the charged dust particles is comparable or higher than the ion--thermal speed. This point completely agrees with Rosenberg [J. Vac. Soc. Technol. A 14, 631 (1996)].« less