Simultaneous Measurements of Ion-Acoustic-Wave Potential and Plasma Density Perturbation to Yield γ[sub e]

Abstract

Simultaneous measurements of ion‐acoustic‐wave potential and accompanying plasma density perturbation show that the two ratios, ${\mathrm{eV}}_1{\mathrm{/kT}}_e$ and $n_1{\mathrm{/n}}_0$ , which are related theoretically by ${\gamma }_e$ , are ≪1 and are equal within the limits of experimental error. Thus, these waves are highly linear and ${\gamma }_e$ is experimentally equal to 1.