Abstract
Zonal flows driven by the ITG (ion temperature gradient) drift modes has been performed in the Columbia Linear Machine [R. Scarmozzino, A.K. Sen, and G.A. Navratil, Phys.Rev.Lett. 57, 1729 (1986)]. The difficult problem of detection of zonal flows has been solved via a novel diagnostic using the paradigm of FM (frequency modulation) in radio transmission. Using this and Discrete Short Time Fourier Transform, we find a power spectrum peak at ITG (‘carrier’) frequency of ∼120kHz and FM sidebands at frequency of ∼2kHz, which has all the signatures of a zonal flow. The results have only partial agreement with most theoretical estimates including the one proposed here.
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