Abstract
Detailed studies of low-frequency microturbulence are presented. We utilize a unique multichannel far-infrared (lambda = 1.22 mn) laser scattering system capable of measuring the entire S(k/sub perpendicular/,..omega..) spectrum during a single tokamak discharge. A statistical dispersion is unfolded for k/sub theta/ which exhibits a phase velocity approx. =3v/sub D/e at low k/sub theta/ with a distinct rolloff for k/sub theta/> or =9 cm/sup -1/. In addition, a strong spatial asymmetry is observed in the k/sub theta/ density fluctuation distribution which reverses with toroidal current direction.
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