Vertical stabilization of tokamak plasmas via extremum seeking. (September 2022)

• Record Type: Journal Article
• Authors: Dubbioso, S.; di Grazia, L.E.; De Tommasi, G.; Mattei, M.; Mele, A.; Pironti, A.
• Is Part Of: IFAC journal of systems and control. Volume 21(2022)
• Publication Date: 2022-09
• Subjects: Plasma vertical stabilization -- Plasma magnetic control -- Tokamak -- Extremum seeking -- Nonlinear simulation -- Closed-loop validation; Automatic control -- Periodicals; Relay control systems -- Periodicals; Embedded computer systems -- Periodicals; Feedback control systems -- Periodicals; Artificial intelligence -- Periodicals; Artificial intelligence; Automatic control; Embedded computer systems; Feedback control systems; Relay control systems; Electronic journals; Periodicals; 629.89
• DOI: 10.1016/j.ifacsc.2022.100203
• Languages: English
• ISSNs: 2468-6018

Abstract

Abstract: In this paper we propose a vertical stabilization (VS) control system for tokamak plasmas based on the extremum seeking (ES) algorithm. The gist of the proposed strategy is to inject an oscillating term in the control action and exploit a modified ES algorithm in order to bring to zero the average motion of the plasma along the unstable mode. In this way, the stabilization of the unstable vertical dynamic of the plasma is achieved. The approach is validated by means of both linear and nonlinear simulations of the overall ITER tokamak magnetic control system, with the aim of demonstrating robust operation throughout the flat-top phase of a discharge and the capability of reacting to a variety of disturbances.