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

L. Laborde, 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, T. Tala, A. Tuccillo

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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 multioutput 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 - Jan 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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