title: Measurements of nonlinear growth of ion-acoustic waves in two-ion-species plasmas with thomson scattering.
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.
authors.affiliation: L-399, Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors.forename: D H
authors.initials: DH
authors.lastname: Froula
authors.forename: L
authors.initials: L
authors.lastname: Divol
authors.forename: S H
authors.initials: SH
authors.lastname: Glenzer