Phys. Rev. Lett. 64, 3019–3022 (1990)Fluid moment models for Landau damping with application to the ion-temperature-gradient instabilityReceived 23 February 1990; published in the issue dated 18 June 1990 A closed set of fluid moment equations is developed which represents kinetic Landau damping physics and which takes a simple form in wave-number space. The linear-response function corresponds to a three-pole (or four-pole) approximation to the plasma dispersion function Z. Alternatively, the response is exact for a distribution function which is close to Maxwellian, but which decreases asymptotically as 1/v4 (or 1/v6). Among other applications, these equations should be useful for nonlinear studies of turbulence driven by the ion-temperature-gradient or other drift-wave microinstabilities. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.3019
DOI:
10.1103/PhysRevLett.64.3019
PACS:
52.35.Qz, 02.60.+y, 52.25.Kn
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