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25 April 2024

» pubmed » pmid15524996

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Identification of zonal flows in a toroidal plasma
A Fujisawa ; K Itoh ; H Iguchi ; K Matsuoka ; S Okamura ; A Shimizu ; T Minami ; Y Yoshimura ; K Nagaoka ; C Takahashi ; M Kojima ; H Nakano ; S Ohsima ; S Nishimura ; M Isobe ; C Suzuki ; T Akiyama ; K Ida ; K Toi ; S-I Itoh ; P H Diamond ;
Date:	15 Oct 2004
Journal:	Phys Rev Lett, 93 (16), 165002
Abstract:	This Letter presents experimental confirmation of the presence of zonal flows in magnetically confined toroidal plasma using an advanced diagnostic system--dual heavy ion beam probes. The simultaneous observation of an electric field at two distant toroidal locations (approximately 1.5 m apart) in the high temperature (approximately 1 keV) plasma provides a fluctuation spectrum of electric field (or flow), a spatiotemporal structure of the zonal flows (characteristic radial length of approximately 1.5 cm and lifetime of approximately 1.5 ms), their long-range correlation with toroidal symmetry (n=0), and the difference in the zonal flow amplitude with and without a transport barrier. These constitute essential elements of turbulence-zonal flow systems, and illustrate one of the fundamental processes of structure formation in nature.
Source:	PubMed, pmid15524996
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