Measurements of Nonlinear Growth of Ion-Acoustic Waves in Two-Ion-Species Plasmas with Thomson Scattering
- 25 February 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 88 (10), 105003
- https://doi.org/10.1103/PhysRevLett.88.105003
Abstract
We report the first Thomson-scattering measurements of the growth of ion-acoustic waves in well-characterized multi-ion-species plasmas consisting of gold and beryllium. We observe that only the berylliumlike mode grows, verifying linear kinetic theory. In addition, a twofold increase in ion temperature is measured when ion-acoustic waves are excited to large amplitudes by stimulated Brillouin scattering (SBS). This increase in ion temperature is a strong indication of hot ions due to trapping. We explain the measured SBS reflectivity by nonlinear detuning of the SBS instability due to these trapping effects.Keywords
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