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The flow shear associated with the differential toroidal rotation of tokamakplasmas breaks an underlying symmetry of the turbulent fluctuations imposed bythe up-down symmetry of the magnetic equilibrium. Using experimentalBeam-Emission-Spectroscopy (BES) measurements and gyrokinetic simulations, thissymmetry breaking in ion-scale turbulence in MAST is shown to manifest itselfas a tilt of the spatial correlation function and a finite skew in thedistribution of the fluctuating density field. The tilt is a statisticalexpression of the "shearing" of the turbulent structures by the mean flow. Theskewness of the distribution is related to the emergence of long-lived densitystructures in sheared, near-marginal plasma turbulence. The extent to whichthese effects are pronounced is argued (with the aid of the simulations) todepend on the distance from the nonlinear stability threshold. Away from thethreshold, the symmetry is effectively restored.

Symmetry breaking in MAST plasma turbulence due to toroidal flow shear