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-βN diagram (Fig.4).
MHD analysis of Beta Collapses in AT JET discharges
Pucella, G.;Giovannozzi, E.;Buratti, P.
2015-01-01
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-βN diagram (Fig.4).File in questo prodotto:
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