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Phys Rev Lett. 2011 Sep 9;107(11):115001. Epub 2011 Sep 7.

Observation of long-distance radial correlation in toroidal plasma turbulence.

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  • 1Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan.

Abstract

This Letter presents the discovery of macroscale electron temperature fluctuations with a long radial correlation length comparable to the plasma minor radius in a toroidal plasma. Their spatiotemporal structure is characterized by a low frequency of ∼1-3  kHz, ballistic radial propagation, a poloidal or toroidal mode number of m/n=1/1 (or 2/1), and an amplitude of ∼2% at maximum. Nonlinear coupling between the long-range fluctuations and the microscopic fluctuations is identified. A change of the amplitude of the long-range fluctuation is transmitted across the plasma radius at the velocity which is of the order of the drift velocity.

PMID:
22026678
[PubMed]
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