Current drive and mode stabilization experiments with real-time control of the gyrotron output power

Real-time control of the gyrotron output power has been obtained by controlling the gyrotron cathode voltage. This control system has been used to explore feedback control of global and local plasma parameters. A description is given of technical set-up and of the results, which include control of the electron temperature Te with excellent time response and successful stabilization of m/n=2/1 modes in case of cw injection.