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(ITERP2/10) Direct Measurement of the Plasma Equilibrium Response to Poloidal Field Changes and H_$\infty$ Controller Tests in TCV

J. B. Lister¹, R. Albanese², G. Ambrosino³, M. Ariola³, I. Bandyopadhyay⁴, A. Coutlis⁵, D. J. N. Limebeer⁵, A. Pironti³, F. Villone⁶, P. Vyas¹, J. P. Wainwright⁵

¹ Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
² Associazione Euratom/ENEA/CREATE, Dipartimento di Ingegneria, Universit degli Studi di Napoli Federico II, Via Claudio 21, I-80125 Napoli, Italy
³ Associazione Euratom/ENEA/CREATE, Dipartimento di Informatica e Sistemistica, Universit degli Studi di Napoli Federico II, Via Claudio 21, I-80125 Napoli, Italy
⁴ Institute for Plasma Research, Bhat, Gandhinagar 382428, India
⁵ Centre for Process Engineering, Imperial College of Science, Technology and Medicine, Roderic Hill Building, London SW7 2BZ, United Kingdom
⁶ Associazione Euratom/ENEA/CREATE, Dipartimento di Ingegneria Industriale, Universitá di Cassino, I-03043, Cassino (Fr), Italy

Abstract.  The control of ITER provides several challenges which can be met using existing techniques for the design of modern controllers. The specific case of the control of the Poloidal Field (PF) system has sollicited considerable interest. One feature of the design of such controllers is their dependence on a sufficiently accurate model of the full system under control. To this end, experiments have been performed on the TCV tokamak to validate one plasma equilibrium response model, the CREATE-L model. Using a new technique, the open loop response of TCV has been directly measured in the frequency domain. These experimental results compare well with the CREATE-L model. This model was subsequently used to design a PF system controller, using methods proposed during the ITER EDA and the first test on TCV has been successful.

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