Dynamics of two discrete vortices with different circulations composed of pure electron plasmas

Journal Article · Mon Jun 29 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4923113· OSTI ID:22490694

Soga, Yukihiro; Mihara, Yasuhiro; Park, Youngsoo ^[1]

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1. Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192 JAPAN (Japan)

Two-dimensional dynamics of two vortex strings with different circulations were experimentally observed. The strings were composed of pure electron plasmas and were confined in a Malmberg–Penning trap. When one of the two vortices trapped in a conventional potential well had weak circulation, the orbits of the two vortices contradicted the point vortex theory. This disagreement stems from an unavoidable external electric field that exerts a different additional E × B drift velocity on each vortex. We resolved the discrepancy between observation and theory by applying a stepwise potential to the end electrodes, which produced a less non-ideal electric field.

• OSTI ID: 22490694
• Journal Information: AIP Conference Proceedings, Vol. 1668, Issue 1; Conference: 11. international workshop on non-neutral plasmas, Takamatsu (Japan), 1-4 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRIC FIELDS
ELECTRODES
ELECTRONS
ORBITS
PLASMA
POTENTIALS
TRAPPING
TRAPS
TWO-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL SYSTEMS
VELOCITY
VORTEX THEORY
VORTICES