Nontrapping arrest of Langmuir wave damping near the threshold amplitude

Details Nontrapping arrest of Langmuir wave damping near the threshold amplitude Nontrapping arrest of Langmuir wave damping near the threshold amplitude

2005-10-14

arxiv.org/abs/physics/0510131v3

Physics

Plasma Physics

5 pages, 7 figures, accepted by Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.175001

Evolution of a Langmuir wave is studied numerically for finite amplitudes slightly above the threshold which separates damping from nondamping cases. Arrest of linear damping is found to be a second-order effect due to ballistic evolution of perturbations, resonant power transfer between field and particles, and organization of phase space into a positive slope for the average distribution function $f_{av}$ around the resonant wave phase speed $v_\phi$. Near the threshold trapping in the wave potential does not arrest damping or saturate the subsequent growth phase.

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