Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix

Y. Nagashima; K. Itoh; A. Fujisawa; K. Shinohara; S. I. Itoh; T. Ido; M. Yagi; K. Hoshino; A. Ejiri; Y. Takase; K. Uehara; Y. Miura

doi:10.1088/0741-3335/51/6/065019

Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix

Y. Nagashima, K. Itoh, A. Fujisawa, K. Shinohara, S. I. Itoh, T. Ido, M. Yagi, K. Hoshino, A. Ejiri, Y. Takase, K. Uehara, Y. Miura

Division of Nuclear Fusion Dynamics

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

16 Citations (Scopus)

Abstract

We present a detailed investigation of the geodesic acoustic eigenmode (GAEM) profile in the vicinity of the last closed flux surface (LCFS) in the JFT-2M tokamak. Envelope and spectral peak frequency of the GAEM vanish near the LCFS obtained by an equilibrium reconstitution code. Spatial changes in mean plasma gradients (the electron temperature, electron density and floating potential) are correlated with the boundary. This does not contradict that the GAEM can have a node at the LCFS. Discussions of an inverse problem and the application of this GAEM measurement to an experimental test of the LCFS location calculated by the equilibrium reconstitution code are presented.

Original language	English
Article number	065019
Journal	Plasma Physics and Controlled Fusion
Volume	51
Issue number	6
DOIs	https://doi.org/10.1088/0741-3335/51/6/065019
Publication status	Published - 2009

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/51/6/065019

Cite this

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title = "Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix",

abstract = "We present a detailed investigation of the geodesic acoustic eigenmode (GAEM) profile in the vicinity of the last closed flux surface (LCFS) in the JFT-2M tokamak. Envelope and spectral peak frequency of the GAEM vanish near the LCFS obtained by an equilibrium reconstitution code. Spatial changes in mean plasma gradients (the electron temperature, electron density and floating potential) are correlated with the boundary. This does not contradict that the GAEM can have a node at the LCFS. Discussions of an inverse problem and the application of this GAEM measurement to an experimental test of the LCFS location calculated by the equilibrium reconstitution code are presented.",

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T1 - Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix

AU - Nagashima, Y.

AU - Itoh, K.

AU - Fujisawa, A.

AU - Shinohara, K.

AU - Itoh, S. I.

AU - Ido, T.

AU - Yagi, M.

AU - Hoshino, K.

AU - Ejiri, A.

AU - Takase, Y.

AU - Uehara, K.

AU - Miura, Y.

PY - 2009

Y1 - 2009

N2 - We present a detailed investigation of the geodesic acoustic eigenmode (GAEM) profile in the vicinity of the last closed flux surface (LCFS) in the JFT-2M tokamak. Envelope and spectral peak frequency of the GAEM vanish near the LCFS obtained by an equilibrium reconstitution code. Spatial changes in mean plasma gradients (the electron temperature, electron density and floating potential) are correlated with the boundary. This does not contradict that the GAEM can have a node at the LCFS. Discussions of an inverse problem and the application of this GAEM measurement to an experimental test of the LCFS location calculated by the equilibrium reconstitution code are presented.

AB - We present a detailed investigation of the geodesic acoustic eigenmode (GAEM) profile in the vicinity of the last closed flux surface (LCFS) in the JFT-2M tokamak. Envelope and spectral peak frequency of the GAEM vanish near the LCFS obtained by an equilibrium reconstitution code. Spatial changes in mean plasma gradients (the electron temperature, electron density and floating potential) are correlated with the boundary. This does not contradict that the GAEM can have a node at the LCFS. Discussions of an inverse problem and the application of this GAEM measurement to an experimental test of the LCFS location calculated by the equilibrium reconstitution code are presented.

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JO - Plasma Physics and Controlled Fusion

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Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix

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