Global vortices in rotating pure electron plasmas

Antani, S. N.; Sen, Abhijit; Choudhury, Sourav

doi:10.1088/0031-8949/42/5/013

Cited by 1 publication

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“…In a nonuniform electron magnetoplasma containing equilibrium electron density gradient and fixed ion background, the dynamics of 2D electron drift modes (EDMs) is governed by the modified NSE [7]. Possible stationary solutions of the latter can be cast in the form of a global vortex pattern [7,8] and a double vortex [7,9,10]. Vortex structures have been observed [11,12,13] in low-temperature laboratory devices in which electron clouds are confined by dc electric and magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Turbulence and transport in two-dimensional magnetized electron plasmas

Shaikh

Shukła

2008

Physics of Plasmas

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Electron plasmas confined by an external magnetic field exhibit variations in a two-dimensional plane orthogonal to the confining magnetic field. A nonlinear fluid simulation code to investigate the properties of 2-D electron plasma wave turbulence in a nonuniform magnetoplasma has been developed. It is found that the presence of the density gradient convection by mean electric fields considerably influence the characteristic nonlinear interaction processes, such as the energy cascades and the cross-field electron transport. The initial random turbulent state evolves towards an intermittent state where forward cascade of vorticity coexists with an inverse cascade of electric potential fluctuations. The latter lead to the formation of large scale entities in 2D electron plasmas and can be alternatively understood by seeking exact nonlinear coherent vortex solutions in the form of a dipolar-like configuration. The energy cascades are governed typically by the Kolmogorov-like $k^{-5/3}$ spectrum. In agreement with the experimental observations, we find that the electron transport is improved significantly by the application of an externally imposed electric field

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