Interpretation of radiative divertor studies with impurity seeding in type-I ELMy H-mode plasmas in JET-ILW using EDGE2D-EIRENE

A.E. Jaervinen, M. Groth, M. Airila, P. Belo, M. Beurskens, S. Brezinsek, M. Clever, G. Corrigan, S. Devaux, P. Drewelow, T. Eich, C. Giroud, D. Harting, A. Huber, S. Jachmich, K. Lawson, B. Lipschultz, G. Maddison, C. Maggi, T. MakkonenC. Marchetto, S. Marsen, G.F. Matthews, A.G. Meigs, D. Moulton, M.F. Stamp, S. Wiesen, M. Wischmeier

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Abstract

Abstract Nitrogen seeded JET-ILW H-mode plasmas have been investigated with EDGE2D-EIRENE. The simulations reproduce the experimentally observed factor of 10 reduction in the outer target power deposition when the normalized divertor radiation, Praddiv/PSOL, increases from the unseeded levels of 15% up to the 50% levels required for detachment. At these radiation levels, nitrogen is predicted dominate the total radiation with a contribution of 85%, consistent with previous measurements in JET-C. Due to the low radiative potential of nitrogen at the electron temperatures above 100 eV, more than 80% of the radiation is predicted to occur in the scrape-off layer, making nitrogen a suitable divertor radiator for typical JET divertor conditions with Tearound 30 eV. The simulations reproduce the experimentally observed particle flux reduction at the low-field side target without the need for strong recombination. This is due to strong impurity radiation reducing the power levels entering the deuterium ionization front.
Original languageEnglish
Article number48544
Pages (from-to)135 - 142
Number of pages8
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)

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