Coupling of ‘cold’ electron plasma wave via stationary ion inhomogeneity to the plasma bulk

Using high resolution kinetic (VPPM-OMP 1.0) and fluid (BOUT++) solvers, evolution of long-wavelength electron plasma wave (EPW) in the presence of stationary periodic ion background non-uniformity is investigated. Mode coupling dynamics between long-wavelength EPW mode of scale k and ion inhomogeneity of scale k 0 is illustrated. Validity of well known Bessel function J n (x) scaling in the cold plasma approximation (i.e., when phase velocity ω/k ≫ v thermal ) alongwith the effect of ion inhomogeneity amplitude (A) on temporal evolution of energy density in the long-wavelength EPW mode is investigated. Effect of finite system sizes on the Bessel J n (x) scaling is examined and scaling law for τ FM i.e the time required to attain first minimum of energy density of the corresponding perturbed mode (also called phase mixing time for k ⟶ 0 modes) versus ion inhomogeneity amplitude A obtained from both kinetic and fluid solutions for each of the cases studied, alongwith some major differences in τ FM scaling for small system sizes is also reported.

• Publication year

  2022

• Venue

  Physica Scripta

• Publication date

  2022-06-15

• Fields of study

  Physics

• Identifiers
  DOI 10.1088/1402-4896/ac90f4arXiv 2206.07777
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

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• Physics of plasmas

  2003cited by this paper
• Collected Papers of L. D. Landau

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• The Physics of Fluids

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