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

    63 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

    Fingerprint

    Integrated control
    Real time control
    Plasmas
    controllers
    Actuators
    profiles
    actuators
    Controllers
    Electron temperature
    Singular value decomposition
    decoupling
    temperature profiles
    projection
    electron energy
    Feedback
    decomposition
    Heating
    operators
    heating
    temperature

    Keywords

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

    Cite this

    Laborde, L., Mazon, D., Moreau;, D., Murari, A., Felton, R., Zabeo, L., ... Tuccillo, A. (2005). A model-based technique for integrated real-time profile control in the JET tokamak. Plasma Physics and Controlled Fusion, 47(1), 155 - 183. https://doi.org/10.1088/0741-3335/47/1/010
    Laborde, L. ; Mazon, D. ; Moreau;, D. ; Murari, A. ; Felton, R. ; Zabeo, L. ; Albanese, R. ; Ariola, M. ; Bucalossi, J. ; Crisanti, F. ; de Baar, M. ; de Tommasi, G. ; de Vries, P. ; Joffrin, E. ; Lennholm, M. ; Litaudon, X. ; Pironti, A. ; Tala, Tuomas ; Tuccillo, A. / A model-based technique for integrated real-time profile control in the JET tokamak. In: Plasma Physics and Controlled Fusion. 2005 ; Vol. 47, No. 1. pp. 155 - 183.
    @article{c622ebd96d834122aaa8e1de7cebbde2,
    title = "A model-based technique for integrated real-time profile control in the JET tokamak",
    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.",
    keywords = "JET, plasma, fusion energy, fusion reactors, tokamak",
    author = "L. Laborde and D. Mazon and D. Moreau; and A. Murari and R. Felton and L. Zabeo and R. Albanese and M. Ariola and J. Bucalossi and F. Crisanti and {de Baar}, M. and {de Tommasi}, G. and {de Vries}, P. and E. Joffrin and M. Lennholm and X. Litaudon and A. Pironti and Tuomas Tala and A. Tuccillo",
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    Laborde, L, Mazon, D, Moreau;, D, Murari, A, Felton, R, Zabeo, L, Albanese, R, Ariola, M, Bucalossi, J, Crisanti, F, de Baar, M, de Tommasi, G, de Vries, P, Joffrin, E, Lennholm, M, Litaudon, X, Pironti, A, Tala, T & Tuccillo, A 2005, 'A model-based technique for integrated real-time profile control in the JET tokamak', Plasma Physics and Controlled Fusion, vol. 47, no. 1, pp. 155 - 183. https://doi.org/10.1088/0741-3335/47/1/010

    A model-based technique for integrated real-time profile control in the JET tokamak. / Laborde, L. (Corresponding Author); Mazon, D.; Moreau;, D.; Murari, A.; Felton, R.; Zabeo, L.; Albanese, R.; Ariola, M.; Bucalossi, J.; Crisanti, F.; de Baar, M.; de Tommasi, G.; de Vries, P.; Joffrin, E.; Lennholm, M.; Litaudon, X.; Pironti, A.; Tala, Tuomas; Tuccillo, A.

    In: Plasma Physics and Controlled Fusion, Vol. 47, No. 1, 2005, p. 155 - 183.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - A model-based technique for integrated real-time profile control in the JET tokamak

    AU - Laborde, L.

    AU - Mazon, D.

    AU - Moreau;, D.

    AU - Murari, A.

    AU - Felton, R.

    AU - Zabeo, L.

    AU - Albanese, R.

    AU - Ariola, M.

    AU - Bucalossi, J.

    AU - Crisanti, F.

    AU - de Baar, M.

    AU - de Tommasi, G.

    AU - de Vries, P.

    AU - Joffrin, E.

    AU - Lennholm, M.

    AU - Litaudon, X.

    AU - Pironti, A.

    AU - Tala, Tuomas

    AU - Tuccillo, A.

    PY - 2005

    Y1 - 2005

    N2 - 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.

    AB - 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.

    KW - JET

    KW - plasma

    KW - fusion energy

    KW - fusion reactors

    KW - tokamak

    U2 - 10.1088/0741-3335/47/1/010

    DO - 10.1088/0741-3335/47/1/010

    M3 - Article

    VL - 47

    SP - 155

    EP - 183

    JO - Plasma Physics and Controlled Fusion

    JF - Plasma Physics and Controlled Fusion

    SN - 0741-3335

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