Model-based decoupling control of tokamak plasmas

Several model-based decoupling controllers have been simulated or implemented for control of plasmas in operating tokamaks. This type of control provides an appealing solution for those responsible for operating tokamaks because of the intuitive relationship between changes in control actuators and the response of controlled plasma parameters. We describe some of the decoupling control methods currently in use and under development for operating tokamaks as well as several practical issues associated with this choice of controller.