Neutral particle drag on parallel flow shear driven instability

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Abstract

The neutral drag effect on the parallel velocity gradient driven instability (PVG) in the presence of density inhomogeneity is theoretically investigated. The dispersion relation of PVG mode with the effect of the density gradient and neutral particle drag is derived, and its solution is analytically obtained. The neutral particle drag gives rise to the phase shift between parallel flow and electrostatic potential fluctuations and modifies the parallel compression. As a result, the stability of the PVG mode changes. It is found that the neutral particle drag does not only reduce but also enhances the instability. Specifically, near the marginal condition, the neutral particle effect suppresses the density gradient effect, and the parameter region where the PVG mode is linearly unstable significantly expands.

Original languageEnglish
Article number082105
JournalPhysics of Plasmas
Volume27
Issue number8
DOIs
Publication statusPublished - Aug 1 2020

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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