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Excitation of beta-induced Alfvén eigenmodes in the presence of a magnetic island
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- Annibaldi, Silvia Valeria (author)
- KTH,Rymd- och plasmafysik,Associazione EURATOM-ENEA, Italy
- Zonca, F. (author)
- Buratti, P. (author)
- (creator_code:org_t)
- 2007-03-19
- 2007
- English.
- In: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 0741-3335 .- 1361-6587. ; 49:4, s. 475-483
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Compressibility
- Eigenvalues and eigenfunctions
- Electric discharges
- Energy gap
- Natural frequencies
Publication and Content Type
- ref (subject category)
- art (subject category)
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