Edge turbulence scaling in RFX-mod as measured using GPI diagnostic

P. Scarin, M. Agostini, R. Cavazzana, F. Sattin, G. Serianni, M. Spolaore, N. Vianello

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Abstract

The nature of plasma edge turbulence has been studied in the Reversed Field Pinch (RFP) RFX-mod, making use of a Gas Puffing Imaging (GPI) diagnostic, with high time (2 MHz) and space (5 mm) resolution. The edge turbulence has been characterized in terms of toroidal phase velocity of fluctuations, vφ{symbol}, of the width of emission structures, 2σ, and of their linear density in the toroidal direction. The packing fraction f{hook}pof intermittent structures has been estimated as the fraction of occupied area in a plane perpendicular to the magnetic field. The behaviors of vφ{symbol},f{hook}p, and 2σ are reported as functions of the density normalized to its Greenwald value, n/nG. A comparison at different plasma regimes of an effective diffusion coefficient Dpdue to the plasma trapped in coherent structures has been discussed. A decreasing trend of Dpwith n/nGvalues has been guessed. © 2009 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)444 - 447
Number of pages4
JournalJournal of Nuclear Materials
Volume390-391
Issue number1
DOIs
Publication statusPublished - 15 Jun 2009
Externally publishedYes

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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., Cavazzana, R., Sattin, F., Serianni, G., Spolaore, M., & Vianello, N. (2009). Edge turbulence scaling in RFX-mod as measured using GPI diagnostic. Journal of Nuclear Materials, 390-391(1), 444 - 447. https://doi.org/10.1016/j.jnucmat.2009.01.129