Limits of applicability of the quasilinear approximation to the electrostatic wave-plasma interaction

  title={Limits of applicability of the quasilinear approximation to the electrostatic wave-plasma interaction},
  author={Georgios Zacharegkas and Heinz Isliker and Loukas Vlahos},
  journal={Physics of Plasmas},
The limitation of the Quasilinear Theory (QLT) to describe the diffusion of electrons and ions in velocity space when interacting with a spectrum of large amplitude electrostatic Langmuir, Upper and Lower hybrid waves, is analyzed. We analytically and numerically estimate the threshold for the amplitude of the waves above which the QLT breaks down, using a test particle code. The evolution of the velocity distribution, the velocity-space diffusion coefficients, the driven current, and the… 

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