Data-driven Model-based Combined Magnetic and Kinetic Control on DIII-D

W. Shi, W. Wehner, J. Barton, M.D. Boyer, E. Schuster, D. Moreau, M. L. Walker and J.R. Ferron

Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)

Providence, Rhode Island, USA, October 29 - November 2, 2012

Abstract

In order to take into account the coupling between the different magnetic and kinetic parameters, a multi-input-multi-output (MIMO) model-based controller is introduced to regulate the rotational transform profile and βN in DIII-D. This approach is based on a linear two-time-scale model derived from experimental data. A singular value decomposition of the plasma model is carried out to decouple the system and identify the most relevant control channels. Then, a robust-control technique is used to determine a controller that minimizes the ref- erence tracking error and rejects external disturbances with minimal control energy. Finally, the feedback controller is augmented with an anti-windup compensator, which keeps the given controller well behaved in the presence of actuator saturation. Experimental results illustrate the performance of the proposed controller, which is one of the first plasma profile controllers integrating magnetic and kinetic variables implemented in DIII-D.