Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas.

Autor: Ida K; National Institute for Fusion Science, Toki, Gifu 509-5292, Japan., Kobayashi T; National Institute for Fusion Science, Toki, Gifu 509-5292, Japan., Evans TE; General Atomics, San Diego, California 92186-5608, USA., Inagaki S; Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8580, Japan., Austin ME; University of Texas, Austin, Texas 78712, USA., Shafer MW; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Ohdachi S; National Institute for Fusion Science, Toki, Gifu 509-5292, Japan., Suzuki Y; National Institute for Fusion Science, Toki, Gifu 509-5292, Japan., Itoh SI; Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8580, Japan., Itoh K; National Institute for Fusion Science, Toki, Gifu 509-5292, Japan.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2015 Nov 04; Vol. 5, pp. 16165. Date of Electronic Publication: 2015 Nov 04.
DOI: 10.1038/srep16165
Abstrakt: The coupling between the transport and magnetic topology is an important issue because the structure of magnetic islands, embedded in a toroidal equilibrium field, depends on the nature of the transport at the edge of the islands. Measurements of modulated heat pulse propagation in the DIII-D tokamak have revealed the existence of self-regulated oscillations in the radial energy transport into magnetic islands that are indicative of bifurcations in the island structure and transport near the q = 2 surface. Large amplitude heat pulses are seen in one state followed by small amplitude pulses later in the discharge resulting in a repeating cycle of island states. These two states are interpreted as a bifurcation of magnetic island with high and low heat pulse accessibility. This report describes the discovery of a bifurcation in the coupled dynamics between the transport and topology of magnetic islands in tokamak plasmas.
Databáze: MEDLINE
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