High confinement and high density with stationary plasma energy and strong edge radiation cooling in the upgraded Torus Experiment for Technology Oriented Research (TEXTOR-94)

A. M. Messiaen, J. Ongena, B. Unterberg, J. Boedo, G. Fuchs, R. Jaspers, L. Konen, H. R. Koslowski, G. Mank, J. Rapp, U. Samm, P. E. Vandenplas, G. Van Oost, G. Van Wassenhove, G. Waidmann, R. R. Weynants, G. H. Wolf, G. Bertschinger, G. Bonheure, M. BrixP. Dumortier, F. Durodie, K. H. Finken, B. Giesen, D. Hillis, P. Hutteman, R. Koch, A. Kramer-Flecken, A. Lyssoivan, Ph Mertens, A. Pospieszczyk, A. Post-Zwicker, M. Sauer, B. Schweer, J. Schwelberger, G. Telesca, M. Z. Tokar, R. Uhlemann, M. Vervier, J. Winter

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Abstract

An overview of the results obtained so far for the radiative I-mode regime on the upgraded Torus Experiment for Technology Oriented Research (TEXTOR-94) [Proceedings of the 16th IEEE Symposium on Fusion Engineering (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 1995), Vol. 1, p. 470] is given. This regime is obtained under quasistationary conditions with edge neon seeding in a pumped limiter tokamak with circular cross section. It combines high confinement and high β (up to a normalized beta, [formula omitted]=2) with low edge [formula omitted] values (down to [formula omitted]=2.8) and high density even above the Greenwald limit together with dominant edge radiative heat exhaust, and therefore shows promise for the future of fusion research. Bulk and edge properties of these discharges are described, and a detailed account is given of the energy and particle confinement and their scaling. Energy confinement scales linearly with density as for the nonsaturated Ohmic Neo-Alcator scaling, but the usual degradation with total power remains. No deleterious effects of the neon seeding on fusion reactivity and plasma stability have been observed.

Original languageEnglish
Pages (from-to)1690-1698
Number of pages9
JournalPhysics of Plasmas
Volume4
Issue number5
DOIs
StatePublished - May 1997

Keywords

  • BETA RATIO
  • DEUTERIUM
  • HELIUM
  • PLASMA CONFINEMENT
  • PLASMA DENSITY
  • PLASMA IMPURITIES
  • RADIATIVE COOLING
  • SCALING LAWS
  • TEXTOR TOKAMAK

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