Progress in internal transport barrier plasmas with lower hybrid current drive and heating in JET (Joint European Torus)

J. Mailloux, B. Alper, Y. Baranov, A. Becoulet, A. Cardinali, C. Castaldo, R. Cesario, G. Conway, C. Challis, F. Crisanti, M. de Baar, P. de Vries, A. Ekedahl, K. Erents, C. Gowers, N. Hawkes, G. Hogeweij, F. Imbeaux, E. Joffrin, X. LitaudonP. Lomas, G. Matthews, D. Mazon, V. Pericoli, R. Prentice, F. Rimini, Y. Sarazin, B. Stratton, A. Tuccillo, Tuomas Tala, K.-D. Zastrow, Contributors to the EFDA-JET Work Programme

    Research output: Contribution to journalArticleScientificpeer-review

    63 Citations (Scopus)

    Abstract

    In optimized shear plasmas in the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)], safety factor (q) profiles with negative magnetic shear are produced by applying lower hybrid (LH) waves during the plasma current ramp-up phase. These plasmas produce a barrier to the electron energy transport. The radius at which the barrier is located increases with the LH wave power. When heated with high power from ion cyclotron resonance heating and neutral beam injection, they can additionally produce transient internal transport barriers (ITBs) seen on the ion temperature, electron density, and toroidal rotation velocity profiles. Due to recent improvements in coupling, q profile control with LH current drive in ITB plasmas with strong combined heating can be explored. These new experiments have led to ITBs sustained for several seconds by the LH wave. Simulations show that the current driven by the LH waves peaks at the ITB location, indicating that it can act in the region of low magnetic shear.
    Original languageEnglish
    Pages (from-to)2156-2164
    JournalPhysics of Plasmas
    Volume9
    Issue number5
    DOIs
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed
    Event43rd Annual Meeting of the APS Division of Plasma Physics - Long Beach, United States
    Duration: 29 Oct 20012 Nov 2001

    Keywords

    • plasma toroidal confinement
    • plasma transport processes
    • plasma hybrid waves
    • plasma beam injection heating
    • fusion reactor safety
    • plasma
    • plasma density
    • plasma temperature
    • electron density
    • plasma diagnostics
    • plasma simulation
    • plasma radiofrequency heating

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