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Excitation of beta-induced Alfvén eigenmodes in the presence of a magnetic island
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. Associazione EURATOM-ENEA, Italy .
2007 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 49, no 4, 475-483 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2007. Vol. 49, no 4, 475-483 p.
Keyword [en]
Compressibility, Eigenvalues and eigenfunctions, Electric discharges, Energy gap, Natural frequencies
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-155644DOI: 10.1088/0741-3335/49/4/010ISI: 000245439200011ScopusID: 2-s2.0-34247184228OAI: diva2:762862

QC 20141113

Available from: 2014-11-13 Created: 2014-11-07 Last updated: 2014-11-13Bibliographically approved

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Annibaldi, Silvia Valeria
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