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Phys Rev Lett. 2008 Nov 7;101(19):195005. Epub 2008 Nov 7.

Observation of plasma rotation driven by static nonaxisymmetric magnetic fields in a tokamak.

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  • 1General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.


We present the first evidence for the existence of a neoclassical toroidal rotation driven in a direction counter to the plasma current by nonaxisymmetric, nonresonant magnetic fields. At high beta and with large injected neutral beam momentum, the nonresonant field torque slows down the plasma toward the neoclassical "offset" rotation rate. With small injected neutral beam momentum, the toroidal rotation is accelerated toward the offset rotation, with resulting improvement in the global energy confinement time. The observed magnitude, direction, and radial profile of the offset rotation are consistent with neoclassical theory predictions.

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