Bifurcation phenomena of a magnetic island at a rational surface in a magnetic-shear control experiment

K. Ida; S. Inagaki; M. Yoshinuma; Y. Narushima; K. Itoh; T. Kobuchi; K. Y. Watanabe; H. Funaba; S. Sakakibara; T. Morisaki

doi:10.1103/PhysRevLett.100.045003

Bifurcation phenomena of a magnetic island at a rational surface in a magnetic-shear control experiment

K. Ida, S. Inagaki, M. Yoshinuma, Y. Narushima, K. Itoh, T. Kobuchi, K. Y. Watanabe, H. Funaba, S. Sakakibara, T. Morisaki

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Three states of a magnetic island are observed when the magnetic shear at the rational surface is modified using inductive current associated with the neutral beam current drive in the Large Helical Device. One state is the healed magnetic island with a zero island width. The second state is the saturated magnetic island with partial flattening of the Te profile. The third state is characterized by the global flattening of the Te profile in the core region. As the plasma assumes each of the three states consecutively through a bifurcation process a clear hysteresis in the relation between the size of the magnetic island and the magnetic shear is observed.

Original language	English
Article number	045003
Journal	Physical review letters
Volume	100
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.100.045003
Publication status	Published - Jan 30 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.100.045003

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abstract = "Three states of a magnetic island are observed when the magnetic shear at the rational surface is modified using inductive current associated with the neutral beam current drive in the Large Helical Device. One state is the healed magnetic island with a zero island width. The second state is the saturated magnetic island with partial flattening of the Te profile. The third state is characterized by the global flattening of the Te profile in the core region. As the plasma assumes each of the three states consecutively through a bifurcation process a clear hysteresis in the relation between the size of the magnetic island and the magnetic shear is observed.",

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AU - Ida, K.

AU - Inagaki, S.

AU - Yoshinuma, M.

AU - Narushima, Y.

AU - Itoh, K.

AU - Kobuchi, T.

AU - Watanabe, K. Y.

AU - Funaba, H.

AU - Sakakibara, S.

AU - Morisaki, T.

PY - 2008/1/30

Y1 - 2008/1/30

N2 - Three states of a magnetic island are observed when the magnetic shear at the rational surface is modified using inductive current associated with the neutral beam current drive in the Large Helical Device. One state is the healed magnetic island with a zero island width. The second state is the saturated magnetic island with partial flattening of the Te profile. The third state is characterized by the global flattening of the Te profile in the core region. As the plasma assumes each of the three states consecutively through a bifurcation process a clear hysteresis in the relation between the size of the magnetic island and the magnetic shear is observed.

AB - Three states of a magnetic island are observed when the magnetic shear at the rational surface is modified using inductive current associated with the neutral beam current drive in the Large Helical Device. One state is the healed magnetic island with a zero island width. The second state is the saturated magnetic island with partial flattening of the Te profile. The third state is characterized by the global flattening of the Te profile in the core region. As the plasma assumes each of the three states consecutively through a bifurcation process a clear hysteresis in the relation between the size of the magnetic island and the magnetic shear is observed.

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Bifurcation phenomena of a magnetic island at a rational surface in a magnetic-shear control experiment

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