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Interaction of a biased cylinder with a flowing dusty plasma

Published online by Cambridge University Press:  06 March 2013

J. K. MEYER ,
J. R. HEINRICH ,
S.-H. KIM  and
R. L. MERLINO
J. K. MEYER
Affiliation:
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242, USA ([email protected])
J. R. HEINRICH
Affiliation:
Air Force Research Laboratory, Kirtland AFB, Albuquerque, NM 87117-5776, USA
S.-H. KIM
Affiliation:
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242, USA ([email protected])
R. L. MERLINO
Affiliation:
Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242, USA ([email protected])
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Abstract

Experimental observations of supersonically flowing dusty plasmas and their interaction with an electrically biased circular cylinder are presented. Two methods for producing flowing dusty plasmas are described. The dusty plasma is produced in a DC anode glow discharge plasma. In Configuration I, a secondary dust cloud, initially formed near a biased grid, flowed away from the grid at supersonic speeds when the grid voltage was suddenly changed. In Configuration II, a pencil-like dust beam was produced using a nozzle-like (converging-diverging) electrostatic potential structure. Using Configuration I, the streaming dust encountered a biased cylinder (wire) whose axis was oriented transverse to the dust flow. The flowing dust particles were repelled by the electrostatic field of the negatively charged cylinder, and a dust void was formed around the cylinder. A detached electrohydrodynamic bow shock, akin to the Earth's magnetohydrodynamic bow shock, was formed on the upstream side of the cylinder, while an extended teardrop-shaped wake region was formed on the downstream side. Video imaging of the dust stream allowed for observations of the structure and evolution of the bow shock. Configuration II was used to produce a narrow beam of dust particles and observe how the beam was deflected around the biased cylinder. Three multimedia files (movies) of the observed phenomena are provided in the online Supplementary material.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 677 - 682
Copyright
Copyright © Cambridge University Press 2013 

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Meyer Supplementary Material

Movie 1

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Video 169.2 KB

Meyer Supplementary Material

Movie 2

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Video 213.8 KB

Meyer Supplementary Material

Movie 3

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Video 101.2 KB