REAL-TIME PLASMA CONTROL-SYSTEM FOR LHD

The large helical device (LHD) is the largest superconducting heliotro n-type device under construction at the National Institute for Fusion Science (NIFS) at Toki, Japan. One of the key issues of the LHD projec t is the demonstration of currentless steady-state plasma operation. T o achieve steady-state operation, real-time plasma control (RTPC) is d esigned. The feedback control system for plasma current is made for th e test of the time response and the algorithm. The fuzzy algorithm has been compared with the standard PID algorithm. The fuzzy control show s better performance for the nonlinear control response than the stand ard PID control. (C) 1998 Elsevier Science S.A. All rights reserved.