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

K. Ida; T. Kobayashi; T. E. Evans; S. Inagaki; M. E. Austin; M. W. Shafer; S. Ohdachi; Y. Suzuki; S. I. Itoh; K. Itoh

doi:10.1038/srep16165

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

K. Ida, T. Kobayashi, T. E. Evans, S. Inagaki, M. E. Austin, M. W. Shafer, S. Ohdachi, Y. Suzuki, S. I. Itoh, K. Itoh

Fusion Engineering

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29 Scopus citations

Abstract

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.

Original language	English
Article number	16165
Journal	Scientific Reports
Volume	5
DOIs	https://doi.org/10.1038/srep16165
State	Published - Nov 4 2015

Funding

This work is supported by NIFS/NINS under the project of Formation of International Scientific Base and Network and Grant-in-Aid for Scientific Research (No. 15H02336, 21224014, 23360414) of JSPS Japan. This work is supported by NIFS/NINS under the project of Formation of International Scientific Base and Network (KEIN1111, KEIN1113). This works is also supported in part by the collaboration programmes of RIAM Kyushu University and of the National Institute for Fusion Science (NIFS13KOCT001), and by the US Department of Energy under DE-FC02-04ER54698, DE-FG03-97ER54415 & DE-AC05-00OR22725.

Funders	Funder number
RIAM Kyushu University
U.S. Department of Energy	DE-AC05-00OR22725, DE-FG03-97ER54415, DE-FC02-04ER54698
Japan Society for the Promotion of Science	23244113, 15H02335, KEIN1111, KEIN1113, 15H02336
National Institutes of Natural Sciences	23360414, 21224014
National Institute for Fusion Science	NIFS13KOCT001

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abstract = "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.",

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AU - Ida, K.

AU - Kobayashi, T.

AU - Evans, T. E.

AU - Inagaki, S.

AU - Austin, M. E.

AU - Shafer, M. W.

AU - Ohdachi, S.

AU - Suzuki, Y.

AU - Itoh, S. I.

AU - Itoh, K.

PY - 2015/11/4

Y1 - 2015/11/4

N2 - 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.

AB - 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.

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

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