Characterization of scrape-off layer transport in JET limiter plasmas

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

  • C. Silva
  • G. Arnoux
  • S. Devaux
  • D. Frigione
  • M. Groth
  • J. Horacek
  • P. J. Lomas
  • S. Marsen
  • G. Matthews
  • L. Meneses
  • R. A. Pitts
  • JET-EFDA Contributors

Organisaatiot

  • Culham Science Centre
  • Instituto Superior Tecnico Lisboa
  • Associazione Euratom/ENEA sulla Fusione
  • Institute of Plasma Physics AS CR
  • Max-Planck-Institut für Plasmaphysik
  • ITER Organisation

Kuvaus

The JET scrape-off layer (SOL) has been characterized with a reciprocating probe in inner wall (IW), and outer wall (OW), limited plasmas. Experiments revealed that SOL profiles are substantially broader (by a factor of ∼5-7.5 in the power e-folding length) for IW limited than in OW limited plasmas. Results are consistent with the larger radial turbulent transport found for IW limited plasmas. Major differences are observed between IW and OW limited plasmas on the density and electron temperature e-folding lengths, parallel flow, radial turbulent transport as well as on the temporal and spatial characteristics of the fluctuations. Experimental findings on JET suggest that the differences in the SOL characteristics for both configurations are due to a combination of a poloidal asymmetry in radial transport with a reduced cross-field transport across the last closed flux surface associated with the confinement improvement observed for OW limited plasmas. The dependence of the SOL power e-folding length on the main plasma parameters was also investigated for IW limited plasmas and a modest negative dependence on both the plasma current and the line-averaged density found. Finally, it is shown that the SOL radial transport and the amplitude of the fluctuations increase with plasma current and decrease with line-averaged density for IW limited plasmas.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli083022
Sivut1-12
Sivumäärä12
JulkaisuNuclear Fusion
Vuosikerta54
Numero8
TilaJulkaistu - 1 elokuuta 2014
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 4162765