Toroidal rotation profile control for the DIII-D tokamak

A model-based control approach for the combined regulation of the plasma toroidal angular rotation profile and stored energy for the DIII-D tokamak is proposed in this work. We consider, a first-principles-driven (FPD), control-oriented model of the toroidal rotation profile evolution which incorporates scenario-specific models of the momentum sources. Available rotation control mechanisms include the non-axisymmetric field coils, which provide rotation damping, and the neutral beam injectors (NBI). The plasma stored energy is regulated by the total injected auxiliary power. Optimal state feedback control with integral action is used to regulate the profile around a target while rejecting disturbances. The controller is designed to be robust against uncertainties in the anomalous momentum diffusivity term.