Abstract
By heterodyne detection of scattered microwaves, density fluctuations have been observed in the PLT tokamak in the range of wavelengths 0.2-2 cm and with frequencies up to 200 to 300 kHz. The flux of runaway electrons onto the limiter was modulated in the same range of frequencies. The level of turbulence was enhanced by the injection of energetic neutrals; and for ion temperatures in excess of 4 keV, a new type of oscillation was observed.

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