Plasma shape control for the JET tokamak: an optimal output regulation approach

The eXtreme Shape Controller, designed and implemented on the JET tokamak, was described. The controller regulates the plasma shape as specified in terms of plasma-wall distances and maintains this plasma shape in the presence of significant variations of critical plasma parameters, namely the poloidal beta, the internal inductance, and the plasma current. The design procedure is based on the SVD of the plant output matrix. This procedure accounts for specifications on the accuracy of the controller variables as well as the maximum allowable control effort. The new controller has been fully commissioned on the JET tokamak, is in regular operation, and is delivering the expected performance.

[1]  G. Ambrosino,et al.  Optimal regulation for linear non right-invertible plants , 2003, 42nd IEEE International Conference on Decision and Control (IEEE Cat. No.03CH37475).

[2]  A. Pironti,et al.  Fusion, tokamaks, and plasma control: an introduction and tutorial , 2005, IEEE Control Systems.

[3]  Basil Kouvaritakis,et al.  A discrete adaptive near-time optimum control for the plasma vertical position in a Tokamak , 2001, IEEE Trans. Control. Syst. Technol..

[4]  Filippo Sartori,et al.  JET real-time object-oriented code for plasma boundary reconstruction , 2003 .

[5]  Alfredo Pironti,et al.  Design and experimental testing of a robust multivariable controller on a tokamak , 2002, IEEE Trans. Control. Syst. Technol..

[6]  Massimiliano Mattei,et al.  Plasma Response Models for Current, Shape and Position Control in Jet , 2003 .

[7]  Alfredo Portone,et al.  A control scheme to deal with coil current saturation in a Tokamak , 2001, IEEE Trans. Control. Syst. Technol..

[8]  Filippo Sartori,et al.  Plasma control at JET , 2000 .

[9]  Massimiliano Mattei,et al.  Upgrade of the present JET shape and vertical stability controller , 2003 .

[10]  A. Beghi,et al.  Advances in real-time plasma boundary reconstruction: from gaps to snakes , 2005, IEEE Control Systems.

[11]  R. Albanese,et al.  The linearized CREATE-L plasma response model for the control of current, position and shape in tokamaks , 1998 .

[12]  B. Montgomery,et al.  ITER-a world class challenge and opportunity , 1995, IEEE Transactions on Applied Superconductivity.

[13]  Parag Vyas,et al.  VERTICAL POSITION CONTROL ON COMPASS-D , 1998 .

[14]  G. Ambrosino,et al.  Magnetic control of plasma current, position, and shape in Tokamaks: a survey or modeling and control approaches , 2005, IEEE Control Systems.

[15]  Basil Kouvaritakis,et al.  Application of cautious stable predictive control to vertical positioning in COMPASS-D tokamak , 1999, IEEE Trans. Control. Syst. Technol..

[16]  J. A. Leuer,et al.  DEVELOPMENT OF MULTIVARIABLE CONTROL TECHNIQUES FOR USE WITH THE DIII-D PLASMA CONTROL SYSTEM , 1999 .