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(EX1/3) Overview of RI-Mode Results on TEXTOR-94

R. R. Weynants¹, A. M. Messiaen¹, J. Ongena^1* , B. Unterberg², G. Bonheure¹, P. Dumortier¹, R. Jaspers³, R. Koch¹, H. R. Koslowski², A. Krämer-Flecken², G. Mank², J. Rapp², M. Z. Tokar², G. van Wassenhove¹, W. Biel², M. Brix², F. Durodie¹, G. Esser², K. H. Finken², G. Fuchs², B. Giesen², J. Hobirk², P. Hüttemann², M. Lehnen,A. Lyssoivan¹, Ph. Mertens², A. Pospieszczyk², U. Samm², M. Sauer², B. Schweer², R. Uhlemann², P. E. Vandenplas¹, G. van Oost¹, M. Vervier¹, V. Philipps², G. Waidmann², G. H. Wolf²

Trilateral Euregio Cluster:
¹ Laboratoire de Physique des Plasmas - Laboratorium voor Plasmafysica, Association ``EURATOM-Belgian State'', Ecole Royale Militaire - B-1000 Brussels - Koninklijke Militaire School
<sup>2</sup> Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association , D-52425 Jülich, FRG
<sup>3</sup> FOM Instituut voor Plasmafysica Rijnhuizen Associatie ``FOM-EURATOM'', Nieuwegein, The Netherlands
^* Researcher at FWO Vlaanderen

Abstract.  The radiative improved mode is a tokamak regime offering many attractive reactor features. In this paper the RI-mode of TEXTOR-94 is shown to follow the same scaling as the Linear Ohmic Confinement regime, thus identifying it as one of the most fundamental tokamak operational regimes. The current understanding derived from experiments and modeling of the conditions necessary for sustaining the mode is reviewed as are the mechanisms leading to L- to RI- mode transition. The compatibility of high impurity seeding with the low central power density of a burning reactor is discussed as well as RI-mode properties at and beyond the Greenwald density.

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