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A submillimeter wave scattering method was used to study low frequency, small scale, density fluctuations in plasmas and we have observed a microturbulence in a range of drift waves in the WT-1 and 2 tokamaks. The density fluctuations are very intense (\ (n₄/n₄\) several percent). The wavenumber spectra have a peak at k ⊥ ρ s ≃0. 5 and are isotropic in the two-dimensional k ⊥ plane, where k ⊥ is the wavenumber perpendicular to the toroidal field B T and ρ s = (MT e) 1/2 /e B T. The frequency spectra are very broad and the high frequency components are contained in an inner part of the plasma. Further, their intensity decreases and the frequency spectrum becomes narrow when the lower hybrid wave driven current is generated.
Saito et al. (1981) studied this question.