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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)
The control of plasma density and temperature are among the most fundamental problems in fusion reactors and will be critical to the success of burning plasma experiments like ITER. While stable burn conditions exist, it is possible that economic and technological constraints will require future commercial reactors to operate with low temperature, high(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)