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

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16 Citations (Scopus)


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 languageEnglish
Article number065019
JournalPlasma Physics and Controlled Fusion
Issue number6
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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