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— In tokamak fusion plasmas, controlling the spatial distribution profile of the toroidal current is key to achieving advanced scenarios characterized by confinement improvement and possible steady-state operation. The dynamics of the current profile are nonlinear and coupled with other plasma parameters, motivating the use of model-based control(More)
— Setting up a suitable toroidal current profile in a fusion tokamak reactor is vital to the eventual realization of a commercial nuclear fusion power plant. Creating the desired current profile during the ramp-up and early flat-top phases of the plasma discharge and then actively maintaining this target profile for the remainder of the discharge is the(More)
— In this work, a first-principles-driven, control-oriented, nonlinear, partial-differential-equation model of the poloidal flux profile evolution is utilized to design a feedback control algorithm to regulate the rotational transform profile in the DIII-D tokamak. The control goal is to regulate the rotational transform profile, which is related to the(More)
— The control of plasma density profiles is one of the most fundamental problems in fusion reactors. During reactor operation, the spatial profiles of deuterium-tritium fuel, alpha-particles generated by fusion reactions, and energy must be precisely regulated. Here we apply a backstepping boundary control technique to stabilize an unstable equilibrium in a(More)
— System identification techniques have been successfully used to obtain linear dynamic plasma response models around a particular equilibrium in different tokamaks. This paper identifies a two-timescale dynamic model of the rota-tional transform ι profile and β N in response to the electric field due to induction as well as to heating and current drive(More)