L-H transition in the mega-Amp spherical tokamak

R.J. Akers, G.F. Counsell, A. Sykes, L.C. Appel, E.R. Arends, C. Byrom, P.G. Carolan, N.J. Conway, G. Cunningham, A. Dnestrovskij, Y.N. Dnestrovskij, A.R. Field, S.J. Fielding, M. Gryaznevich, P. Helander, A. Kirk, Søren Bang Korsholm, R. Martin, H. Meyer, M.P.S. NightingaleC.M. Roach, V. Shevchenko, M. Tournianski, M.J. Walsh, C.D. Warrick

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    H-mode plasmas have been achieved on the MAST spherical tokamak at input power considerably higher than predicted by conventional threshold scalings. Following L-H transition, a clear improvement in energy confinement is obtained, exceeding recent international scalings even at densities approaching the Greenwald density limit. Transition is accompanied by an order-of-magnitude increase in edge-density gradient, a marked decrease in turbulence, the efficient conversion of internal electron Bernstein waves into free space waves, and the onset and saturation of edge poloidal rotation.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume88
    Issue number3
    Pages (from-to)035002.1-035002.4
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2002

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