MHD analysis of Beta Collapses in AT JET discharges

E. Alessi, L. Piron, P. Buratti, J. Mailloux, N. Hawkes, E. Joffrin, Y. Baranov, E. Giovannozzi, M.P. Gryaznevich, T.C. Hender, T.C. Luce, G. Pucella, C. Sozzi

Research output: Contribution to conferencePaper

Abstract

MHD analysis before BCs has been carried out by SVD. Such analysis showed that modes with high n up to 5 are present before the BC and in certain cases they act as precursor (Fig.2 and 4) showing a fast growth in ∼10ms. This is in contrast with previous CW observations of a BC triggering by a n=1 kink like mode [1,3]. RFA enhancement (Fig.3) for βN>2.5 shows that plasma pressure is approaching the no-wall beta limit. This is found in good agreement with the concentration of BC in the qmin-βNdiagram (Fig.4).
Original languageEnglish
Publication statusPublished - 2015
Externally publishedYes
Event42nd European Physical Society Conference on Plasma Physics, EPS 2015 - Lisbon, Portugal
Duration: 1 Jan 2015 → …

Conference

Conference42nd European Physical Society Conference on Plasma Physics, EPS 2015
CountryPortugal
CityLisbon
Period1/1/15 → …

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Alessi, E., Piron, L., Buratti, P., Mailloux, J., Hawkes, N., Joffrin, E., ... Sozzi, C. (2015). MHD analysis of Beta Collapses in AT JET discharges. Paper presented at 42nd European Physical Society Conference on Plasma Physics, EPS 2015, Lisbon, Portugal.