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The dynamics of hollow, cylindrically shaped pure electron plasmas are studied. Since these plasmas behave like two-dimensional (2-D) fluids with low viscosity, their evolution parallels the evolution of 2-D fluid vorticity annuli inside frictionless circular containers. Growth of the Kelvin–Helmholtz instability in circular geometry is observed. The formation and subsequent interaction of vortices are studied as a function of ring thickness. Small initial perturbations can dramatically increase the symmetry and repeatability of the dynamics.
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Peurrung et al. (1993) studied this question.
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