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Zero-Turbulence Manifold in a Toroidal Plasma

Author(s)
Highcock, E. G.; Schekochihin, A. A.; Cowley, S. C.; Barnes, Michael; Parra Diaz, Felix Ignacio; Roach, C. M.; Dorland, W.; ... Show more Show less
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Abstract
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/ϵ (magnetic field pitch/inverse aspect ratio) is a critical control parameter for sheared tokamak turbulence. By reducing q/ϵ, 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 (γ[subscript E], q/ϵ, R/L[subscript T]), where γ[subscript E] is the perpendicular flow shear and R/L[subscript T] is the normalized inverse temperature gradient scale. The extent to which it can be constructed from linear theory is discussed.
Date issued
2012-12
URI
http://hdl.handle.net/1721.1/77169
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Highcock, E. G. et al. “Zero-Turbulence Manifold in a Toroidal Plasma.” Physical Review Letters 109.26 (2012): n. pag. CrossRef. © 2012 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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