Symmetry breaking in MAST plasma turbulence due to toroidal flow shear

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The flow shear associated with the differential toroidal rotation of tokamak plasmas breaks an underlying symmetry of the turbulent fluctuations imposed by the up-down symmetry of the magnetic equilibrium. Using experimental beam-emission-spectroscopy measurements and gyrokinetic simulations, this symmetry breaking in ion-scale turbulence in MAST is shown to manifest itself as a tilt of the spatial correlation function and a finite skew in the distribution of the fluctuating density field. The tilt is a statistical expression of the 'shearing' of the turbulent structures by the mean flow. The skewness of the distribution is related to the emergence of long-lived density structures in sheared, near-marginal plasma turbulence. The extent to which these effects are pronounced is argued (with the aid of the simulations) to depend on the distance from the nonlinear stability threshold. Away from the threshold, the symmetry is effectively restored.
Publisher
IOP PUBLISHING LTD
Issue Date
2017-03
Language
English
Article Type
Article
Keywords

INTERNAL TRANSPORT BARRIER; BEAM EMISSION; ZONAL FLOWS; MODE; TOKAMAK; CONFINEMENT; DISCHARGES

Citation

PLASMA PHYSICS AND CONTROLLED FUSION, v.59, no.3

ISSN
0741-3335
DOI
10.1088/1361-6587/aa544b
URI
http://hdl.handle.net/10203/222692
Appears in Collection
NE-Journal Papers(저널논문)
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