Feedback Control of Plasma Position in the EXTRAP-T2 Fusion Experiment

Abstract: Automatic control of the plasma radial position, extracted from magnetic measurements, in EXTRAP-T2 is simulated. A simple model of plasma, surrounding copper shell and vertical field coils have been used. Design is concentrated on the PD type of controller with parameters studied in relation to power supply performance, i.e. switching frequency and maximum output voltage. Effects of saturation, noise and feed forward are examined. The controller is also tested with real sensor data from earlier shots.