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Experimental Signatures of Critically Balanced Turbulence in MAST

Author(s)
Ghim, Y.-c.; Schekochihin, A. A.; Field, A. R.; Abel, I. G.; Barnes, Michael; Colyer, G.; Cowley, S. C.; Parra Diaz, Felix Ignacio; Dunai, D.; Zoletnik, S.; MAST Team; ... Show more Show less
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Abstract
Beam emission spectroscopy (BES) measurements of ion-scale density fluctuations in the MAST tokamak are used to show that the turbulence correlation time, the drift time associated with ion temperature or density gradients, the particle (ion) streaming time along the magnetic field, and the magnetic drift time are consistently comparable, suggesting a “critically balanced” turbulence determined by the local equilibrium. The resulting scalings of the poloidal and radial correlation lengths are derived and tested. The nonlinear time inferred from the density fluctuations is longer than the other times; its ratio to the correlation time scales as ν*i[superscript -0.8±0.1], where ν*i=ion   collision   rate/streaming   rate. This is consistent with turbulent decorrelation being controlled by a zonal component, invisible to the BES, with an amplitude exceeding those of the drift waves by ∼ν*i[superscript -0.8].
Date issued
2013-04
URI
http://hdl.handle.net/1721.1/81999
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Ghim, Y.-c., A. A. Schekochihin, A. R. Field, I. G. Abel, M. Barnes, G. Colyer, S. C. Cowley, F. I. Parra, D. Dunai, and S. Zoletnik. Experimental Signatures of Critically Balanced Turbulence in MAST. Physical Review Letters 110, no. 14 (April 2013).
Version: Final published version
ISSN
0031-9007
1079-7114

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