Spectral contents of electron waves under strong Langmuir turbulence
AUTOR(ES)
Alves, M. Virgínia, Dallaqua, R. S., Prado, F. Do, Karfidov, D. M.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2003-12
RESUMO
In this work we present experimental results of electron plasma waves excited in a beam plasma system. Based on our experimental results we determine the transition from the quasi-linear to non-linear regime. We present the space evolution of the electron beam distribution function for both regimes. The spectrum of the electron plasma wave in the non-linear regime shows a component with frequency larger than the plasma frequency besides the plasma frequency itself. We show that the higher frequency component is strongly affected by Landau damping, indicating a dissipation region. The measured experimental power spectrum of this wave shows a dependence on wave number k given by Wk µ k-7/2 as theoretically predicted.
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