Experimental Signatures of Critically Balanced Turbulence in MAST

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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 nu(-0.8+/-0.1)(*i), where nu(*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 nu(-0.8)(*i). DOI: 10.1103/PhysRevLett.110.145002
Publisher
AMER PHYSICAL SOC
Issue Date
2013-04
Language
English
Article Type
Article
Keywords

BEAM EMISSION-SPECTROSCOPY; ALFVENIC TURBULENCE; MAGNETIC-FIELD; ZONAL FLOWS; SOLAR-WIND; MAGNETOHYDRODYNAMIC TURBULENCE; FLUCTUATION MEASUREMENTS; SIMULATIONS; PLASMA; ANISOTROPY

Citation

PHYSICAL REVIEW LETTERS, v.110, no.14

ISSN
0031-9007
DOI
10.1103/PhysRevLett.110.145002
URI
http://hdl.handle.net/10203/191127
Appears in Collection
NE-Journal Papers(저널논문)
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