Ion sound wave excitation in a plasma under a Langmuir turbulence regime

Ion sound wave excitation in a plasma under a Langmuir turbulence regime

Ion sound wave excitation in a warm non-relativistic ( W b ≤ 400 eV) electron beam unmagnetized plasma system is studied experimentally. The spectrum of these waves shows two peaks at frequencies of 70 and 230 kHz respectively. The origin of these waves is connected with modulational instability and...

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Bibliographic Details
Published in:Physics letters. A Vol. 248; no. 1; pp. 86 - 91
Main Authors: Do Prado, F., Karfidov, D.M., Alves, M.Virgínia, Dallaqua, R.S.
Format: Journal Article
Language:English
Published: Elsevier B.V 02-11-1998
Online Access:Get full text
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Summary:Ion sound wave excitation in a warm non-relativistic ( W b ≤ 400 eV) electron beam unmagnetized plasma system is studied experimentally. The spectrum of these waves shows two peaks at frequencies of 70 and 230 kHz respectively. The origin of these waves is connected with modulational instability and cavity collapse. We show that the energy of bulk accelerated electrons can explain the measured value of kr De for high-frequency sound waves. The energy of ion sound waves is not high enough to have an influence on the Langmuir turbulence dynamics.
ISSN:0375-9601
1873-2429
DOI:10.1016/S0375-9601(98)00614-8