A model-based technique for integrated real-time profile control in the JET tokamak

L. Laborde (Corresponding Author), D. Mazon, D. Moreau;, A. Murari, R. Felton, L. Zabeo, R. Albanese, M. Ariola, J. Bucalossi, F. Crisanti, M. de Baar, G. de Tommasi, P. de Vries, E. Joffrin, M. Lennholm, X. Litaudon, A. Pironti, Tuomas Tala, A. Tuccillo

    Research output: Contribution to journalArticleScientificpeer-review

    64 Citations (Scopus)

    Abstract

    This paper describes a new technique which has been implemented on the JET tokamak to investigate integrated real-time control of several plasma profiles simultaneously (such as current, temperature and pressure) and reports the results of the first experimental tests. The profiles are handled through their projection on a suitable basis of functions according to the Galerkin scheme. Their response to three actuators (heating and current drive powers injected in the plasma) is linearized in an experimentally deduced multi-input multi-output model. The singular value decomposition of this model operator allows us to design a distributed-parameter real-time controller which maximizes the steady state decoupling of the multiple feedback loops. It enables us to control several coupled profiles simultaneously, with some degree of fuzziness to let the plasma evolve towards an accessible non-linear state which is the closest to the requested one, despite a limited number of actuators. The first experiments using these techniques show that different current and electron temperature profiles can be obtained and sustained by the controller during a closed-loop operation time window. Future improvements and perspectives are briefly mentioned.

    Original languageEnglish
    Pages (from-to)155 - 183
    Number of pages29
    JournalPlasma Physics and Controlled Fusion
    Volume47
    Issue number1
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

    Keywords

    • JET
    • plasma
    • fusion energy
    • fusion reactors
    • tokamak

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