Excitation of Ion-Sound Fluctuations in a Magnetized Plasma
with Strong Langmuir Turbulence

V. S. Burmasov, L. N. Vyacheslavov, I. V. Kandaurov, E. P. Kruglyakov,
O. I. Meshkov, and A. L. Sanin

Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences,
Novosibirsk, 630090 Russia

Received February 19, 1996; in final form, July 9, 1996

Abstract—In the presence of the strong Langmuir turbulence excited by a high-power relativistic electron
beam (E = 700 keV, j = 1.5 kA/cm², = 200 ns), the energy density of ion-sound fluctuations in a nonisothermal
magnetized plasma (n_e ~ 10¹⁵ cm³, T_e T_i) is measured. The turbulence is studied by laser scattering (CO₂
laser, E = 10 J, = 10.288 m). It is shown that the spectral energy density of ion-sound oscillations substan-
tially exceeds the thermal level (W_k / T_e 10⁵). From the k spectrum of ion-sound fluctuations, the upper limit
for the minimum dimension of collapsing cavities, l_min < 30r_D, is found.

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