Zero-Turbulence Manifold in a Toroidal Plasma

Details Zero-Turbulence Manifold in a Toroidal Plasma Zero-Turbulence Manifold in a Toroidal Plasma

2012-03-29

arxiv.org/abs/1203.6455v1

Physics

Plasma Physics

5 Pages, 4 Figures, Submitted to PRL

Scientific paper

Sheared toroidal flows can cause bifurcations to zero-turbulent-transport states in tokamak plasmas. The maximum temperature gradients that can be reached are limited by subcritical turbulence driven by the parallel velocity gradient. Here it is shown that q/\epsilon (magnetic field pitch/inverse aspect ratio) is a critical control parameter for sheared tokamak turbulence. By reducing q/\epsilon, far higher temperature gradients can be achieved without triggering turbulence, in some instances comparable to those found experimentally in transport barriers. The zero-turbulence manifold is mapped out, in the zero-magnetic-shear limit, over the parameter space (\gamma_E, q/\epsilon, R/L_T), where \gamma_E is the perpendicular flow shear and R/L_T is the normalised inverse temperature gradient scale. The extent to which it can be constructed from linear theory is discussed.

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