Abstract
Three-dimensional ion acoustic turbulence is excited by injecting a cold ion beam into a nonmagnetized plasma with $\frac{{T}_{e}}{{T}_{i}}>5$. A rapid, approximately exponential heating of the ion beam is observed along the beam path. The heating rates level off when the ion temperature approaches $0.2{T}_{e}$. The turbulent ion acoustic wave energy density does not exceed $(1\ensuremath{-}3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}{T}_{e}$. Wave saturation, which occurs before significant dissipation of ion beam energy, is consistent with orbit-diffusion strong-turbulence theory.
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