Radiation and confinement properties of impurity seeded discharges in the reversed field pinch RFX

L. Carraro, S. Costa, M.E. Puiatti, F. Sattin, P. Scarin, G. Telesca, M.Z. Tokar, M. Valisa, P. Franz, L. Marrelli

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Abstract

The compatibility of the reversed field pinch configuration with a highly radiative mantle at the edge has been proven by injecting neon into high density RFX plasmas: with respect to ordinary non-seeded discharges, energy confinement only marginally deteriorates, and the convection losses onto the plasma facing wall are reduced. Injection of neon into low density plasmas entails instead a significant increase of the effective charge and an increment of the ohmic input higher than the radiated power increase. The associated degradation of energy confinement τE appears not to be peculiar to impurity injection but follows a more general scaling with the heating power Pheat of the type τE∝Pheat-1. The radiation efficiency, defined as the ratio between radiated power and the impurity contribution to effective charge, is found to be 3 to 5 times higher than that in tokamaks. RITM simulations confirm the experimental findings.
Original languageEnglish
Pages (from-to)1983 - 1991
Number of pages9
JournalNuclear Fusion
Volume40
Issue number12
DOIs
Publication statusPublished - Dec 2000
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

Carraro, L., Costa, S., Puiatti, M. E., Sattin, F., Scarin, P., Telesca, G., ... Marrelli, L. (2000). Radiation and confinement properties of impurity seeded discharges in the reversed field pinch RFX. Nuclear Fusion, 40(12), 1983 - 1991. https://doi.org/10.1088/0029-5515/40/12/303