Excitation of beta-induced Alfvén eigenmodes in the presence of a magnetic island

S.V. Annibaldi, F. Zonca, P. Buratti

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Abstract

Observation of magnetic activity in several discharges in the Frascati Tokamak Upgrade has revealed high-frequency oscillations that accompany the development of large magnetic islands in ohmic plasmas. The frequency of these oscillations is one order of magnitude above the typical island rotation frequency and one order of magnitude below the toroidicity-induced gap of the shear-Alfvén continuum. By writing a precise dispersion relation, we interpret these modes as beta-induced Alfvén eigenmodes, i.e. Alfvén eigenmodes located in the low frequency gap which is caused by finite compressibility. © 2007 IOP Publishing Ltd.
Original languageEnglish
Article number010
Pages (from-to)475 - 483
Number of pages9
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number4
DOIs
Publication statusPublished - 1 Apr 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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