Interplay between edge magnetic topology, pressure profile and blobs in the edge of RFX-mod

M. Agostini, A. Scaggion, P. Scarin, G. Spizzo, N. Vianello

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Abstract

The observation of the periodic pressure profile time oscillations in the edge region (0.93<r/a<1) of a RFX-mod device allows one to investigate the role of pressure as a turbulence regulation mechanism. The proportionality between the radial correlation length of edge fluctuations and the radial characteristic pressure length Lpsuggests a sort of regulation of the turbulent spatial scale, where Lpsets the radial dimension of the blobs. Moreover, the spatial scale regulation is confirmed by observing a linear scaling between the energy injection scale and the toroidal dimension of the edge coherent structures. On the other hand, the link between Peand turbulence level does not hold locally: the edge fluctuation level is higher in the toroidal region of lower edge pressure gradient. Hence if coherent structures are generated locally in the region of strongest Pe, they flow and accumulate where Peis lower. © 2012 IOP Publishing Ltd.
Original languageEnglish
Article number065003
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number6
DOIs
Publication statusPublished - Jun 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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