Collisional resonance function in discrete-resonance quasilinear plasma systems

A method is developed to analytically determine the resonance broadening function in quasilinear theory from first principles, due to either Krook or Fokker-Planck scattering collisions of marginally unstable plasma systems where discrete resonance instabilities are excited without any mode overlap....

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Veröffentlicht in:Physics of plasmas 2019-12, Vol.26 (12)
Hauptverfasser: Duarte, V. N., Gorelenkov, N. N., White, R. B., Berk, H. L.
Format: Artikel
Sprache:eng
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Zusammenfassung:A method is developed to analytically determine the resonance broadening function in quasilinear theory from first principles, due to either Krook or Fokker-Planck scattering collisions of marginally unstable plasma systems where discrete resonance instabilities are excited without any mode overlap. It is demonstrated that a quasilinear system that employs the calculated broadening functions reported here systematically recovers the growth rate and mode saturation levels for near-threshold plasmas previously calculated from nonlinear kinetic theory. The distribution function is also calculated, which enables precise determination of the characteristic collisional resonance width.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5129260