Plasma Position Control in ASDEX Upgrade

ASDEX Upgrade is a Tokamak with a reactor-like poloidal divertor configuration now under construction at IPP. It is scheduled to go into operation in 1988. In addition to its main object of simulating a reactor-relevant plasma boundary, it is also characterized by reactor-typical features of plasma position and parameter control. Owing to the plasma elongation, the placing of poloidal field coils outside the toroidal field coils and the asymmetry of the poloidal configuration, it involves all the major control problems of present reactor designs: vertical instability, high control power required and mutual dependence of all control variable.