The temporal evolution of the kinetic drift-Alfven instability of plasma shear flow
V. V. Mikhailenko, V. S. Mikhailenko, Hae June Lee, M.E.Koepke
TL;DR
This paper develops a linear non-modal kinetic theory to analyze the time-dependent growth of the kinetic drift-Alfven instability in plasma shear flows, highlighting the role of turbulent scattering and wave coupling disruption.
Contribution
It introduces a novel non-modal kinetic framework for understanding the temporal evolution of drift-Alfven instability in shear flows, emphasizing the impact of turbulent scattering and wave frequency mismatch.
Findings
Growth rate increases with time during instability development
Turbulent scattering accelerates the instability growth
Instability ceases when wave coupling is broken due to frequency mismatch
Abstract
The linear non-modal kinetic theory of the kinetic drift-Alfven instability of plasma shear flows reveals the temporal non-modal growth with growing with time growth rate. The turbulent scattering of the sheared modes on ions accelerates this growth. The instability ceases its growth when the coupling of the drift and Alfven waves violates due to the changing with time frequencies of the drift and Alfven waves in shear flow.
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