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The control of plasma position and shape on present tokamaks is usually based on simple but reliable PID controllers. These controllers are either empirically tuned or based on simplistic models. More detailed models could be exploited by modern control theory to benefit the controller design. Linearized models of the plasma shape and position have been developed for the tokamak à configuration variable (TCV) limited and diverted plasmas. These include a simple rigid current displacement model for ZI(p) and the CREATE-L model for position and shape. The latter is an a priori phenomenological model which assumes that the plasma is in permanent magnetohydrodynamic equilibrium and that the current profile is determined by only l(i), beta(p) and I(p). Variations of the CREATE-L model based on different assumptions have also been tested. A purely mathematical model developed from experimental observations on TCV was also developed. The accuracy and consistency of these models has been extensively tested on TCV and the CREATE-L model is in excellent agreement with open and closed loop experiments. The implications for controller design on TCV, and the suitability of these models for the international thermonuclear engineering reactor (ITER) controller design is assessed.

Additional information

Authors: LISTER J B ET AL, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH);ALBANESE R ET AL, Consorzio CREATE, Naples (IT);COUTLIS A ET AL, Imperial College, London (GB)
Bibliographic Reference: Article: Bulletin of the American Physical Society, Vol. 42 (1997) No. 10, p.1857
Record Number: 199810134 / Last updated on: 1998-02-12
Original language: en
Available languages: en
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