Analysis of Modern Optimal Control Theory Applied to Plasma Position and Current Control in TFTR

The strong compression TFTR discharge has been segmented into regions where linear dynamics can approximate the plasma´s interaction with the OH and EF power supply systems. The dynamic equations for these regions are utilized within the linear optimal control theory framework to provide active feedback gains to control the plasma position and current. Methods are developed to analyze and quantitatively evaluate the quality of control in a nonlinear, more realistic simulation. Tests are made of optimal control theory´s assumptions and requirements, and the feasibility of this method for TFTR is assessed.