Near field diffraction pattern of ion acoustic waves
- 1 May 1977
- journal article
- research article
- Published by AIP Publishing in Physics of Fluids
- Vol. 20 (5) , 840-843
- https://doi.org/10.1063/1.861957
Abstract
Grid‐excited linear ion‐acoustic waves are found to exhibit amplitude modulations which resemble nonlinear particle trapping or the beating of two modes. The modulation is shown to be the antenna pattern of the exciting grid. Double‐plasma waves display the same behavior although the modulations are weaker. A model that explains this difference in terms of the excitation mechanisms is suggested.Keywords
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