Edge plasma physics modifications due to magnetic ripple in RFX-mod

P. Scarin, M. Agostini, L. Carraro, R. Cavazzana, G. Ciaccio, G. De Masi, G. Spizzo, M. Spolaore, N. Vianello

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Abstract

Abstract The edge of the RFX-mod (R = 2 m, a = 0.46 m) Reversed Field Pinch is characterized by weak magnetic chaos affecting ion and electron diffusion. Edge particle transport is strongly influenced by a toroidal asymmetry caused by magnetic islands. An ambipolar radial electric field ensures local neutrality and possesses the same symmetry as the parent magnetic ripple: the result is the modulation of the perpendicular flow, with a slowing-down at the island X-point. In this paper we present a complete statistical analysis, over a large database of RFX-mod discharges, of the edge properties as they are modified by the magnetic topology: the plasma wall footprint follows the helical shape of the dominant central mode (m/n = 1/7), with an increase of Hα emission and electron density corresponding to the O-point of the inner magnetic island. Edge turbulence is modified by the magnetic topology, being generated in the O-point region and damped near the X-point.
Original languageEnglish
Article number48549
Pages (from-to)467 - 470
Number of pages4
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 22 Jul 2015

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Cite this

Scarin, P., Agostini, M., Carraro, L., Cavazzana, R., Ciaccio, G., De Masi, G., ... Vianello, N. (2015). Edge plasma physics modifications due to magnetic ripple in RFX-mod. Journal of Nuclear Materials, 463, 467 - 470. [48549]. https://doi.org/10.1016/j.jnucmat.2014.10.052