Spectral contents of electron waves under strong Langmuir turbulence

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 <FONT FACE=Symbol>µ</FONT> k-7/2 as theoretically predicted.

Bibliographic Details

Main Authors:	Alves,M. Virgínia, Dallaqua,R. S., Prado,F. Do, Karfidov,D. M.
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Física 2003
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332003000400033
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