West Magnetic Control

The WEST facility is an upgrade of the former Tore Supra tokamak. Two in-vessel coils have been added to elongate the plasma shape and achieve diverted magnetic configuration with one or two X-points. This modification has implied the design of a new plasma control system with a dedicated magnetic control to deal with the vertical instability of the elongated plasma. This paper reports the development of this controller. All the aspects of the design are addressed: modeling of the system with the free-boundary equilibrium code FEEQS, controller design based on robust synthesis, simulation and experimental results.