Detailed studies of low-frequency microturbulence are presented. We utilize a unique multi-channel far-infrared (λ=1.22 mm) laser scattering system capable of measuring the entire S(k_⊥, ω) spectrum during a single tokamak discharge. A statistical dispersion is unfolded for k_θ which exhibits a phase velocity 3vDe at low k_θ with a distinct rolloff for k_θ>~9 cm^-1. In addition, a strong spatial asymmetry is observed in the k_θ density-fluctuation distribution which reverses with toroidal current direction.
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Brower et al. (1985) studied this question.
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