Vortex dynamics of 2D electron plasmas

C. F. Driscoll, D. Z. Jin, D. A. Schecter, D. H.E. Dubin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Electron columns confined magnetically in vacuum evolve in (r,θ) as N ∼ 109 field-aligned rods of charge, or point vortices. Neglecting discreteness, the column evolves as would vorticity in an inviscid, incompressible fluid, governed by the Euler equations. The macroscopic flow dynamics is readily imaged, including effects such as surface waves and inviscid damping, two vortex merger, and gradient-driven vortex motion. Turbulent initial states are observed to relax to "vortex crystal" meta-equlibria, due to vortex "cooling" from entropic mixing of background vorticity; and characteristics of this process are predicted by theory. The microscopic discreteness gives rise to point-vortex diffusion, which is strongly affected by the overall flow shear. Macroscopically and microscopically, the vortex dynamics depends critically on whether the vortex is prograde or retrograde with respect to the flow shear.

Original languageEnglish (US)
Pages (from-to)21-27
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume369
Issue number1-4
DOIs
StatePublished - Mar 15 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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