2022/06/15 by Sanjeev Kumar Pandey, Pandey, Sanjeev Kumar, Jagannath Mahapatra +3
Engineering · Physics and Astronomy · #Computational Physics (physics.comp-ph) #Dust and Plasma Wave Phenomena #FOS: Physical sciences #Magnetic confinement fusion research #Plasma Diagnostics and Applications #Plasma Physics (physics.plasm-ph)
paper · pdf · doi:10.48550/arxiv.2206.07777
openalex publication_date 2022/06/15 · openalex created_date 2022/06/19 · openalex updated_date 2026/07/28
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 k0 is illustrated. Validity of well known Bessel function Jn(x) scaling in the cold plasma approximation (i.e., when phase velocity ω/k >> vthermal) along-with 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 Jn(x) scaling is examined and scaling law for τFM 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, along-with some major differences in τFM scaling for small system sizes is also reported.