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Tempest in a glass tube: A helical vortex formation in a complex plasma
Saitou, Yoshifumi; Ishihara, Osamu; Ishihara
AA(Faculty of Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan), AB(Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan), AC()
Journal of Plasma Physics, Volume 80, Issue 6, pp. 869-876
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(c) 2014: Copyright © Cambridge University Press 2014
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A collective behavior of dust particles in a complex plasma with a magnetic field (up to 4 kG) is investigated. Dust particles form a dust disk which is rotating in a horizontal plane pushed by ions rotating with the E × B drift as a trigger force. The thickness of the disk is determined by controlling the experimental conditions. The disk rotates in a horizontal plane and forms a two-dimensional thin structure when the pressure pAr is relatively high. The dust particles are ejected from near the disk center and form a rotation in the vertical plane and, hence, forms a helical vortex when the disk is thick for relatively low pAr . The reason the dust disk has the different thickness is due to the neutral pressure. Under a higher (lower) neutral gas pressure, the disk becomes two (three) dimensional due to the influence of the neutral drag force.
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