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Updated: Jul 19, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
Detection of zero-mean-frequency zonal flows in the core of a high-temperature tokamak plasma
D K Gupta1, R J Fonck, G R McKee
1University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA.
Abstract:
A low-frequency, spectrally broad (Deltaf approximately 10 kHz) poloidal flow structure that peaks near zero frequency is observed in time-resolved measurements of the turbulence velocity field in the core region (r/a approximately 0.6-0.9) of DIII-D tokamak plasmas. These flows exhibit a long poloidal wavelength (low m) and a short radial coherence length comparable to the ambient turbulence decorrelation length. Characteristics of these observed poloidal flows are consistent with the theoretically predicted residual or zero-mean-frequency zonal flows.
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