Development of Model-Based Feedback Control for the Current Profile in DIII-D
Y. Ou, C. Xu, E. Schuster, T.C. Luce, J. Ferron, M. Walker, D. Humphreys, T. Casper, W. Meyer
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Orlando, Florida, November 12-16, 2007
Abstract
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A key goal in control of an advanced tokamak (AT) discharge is to
maintain safety factor (q) and pressure profiles that are compatible
with MHD stability at high beta and at high fraction of bootstrap
current. This will enable high fusion gain and non-inductive
sustainment of the plasma current for steady-state operation. Active
feedback control of the q profile evolution at DIII-D has been already
demonstrated [1], and an open-loop control scheme has been proposed [2].
We report up-to-date progress towards enabling model-based active
control of the current profile during the plasma current ramp-up phase.
New results on closed-loop control design, simulation assessment with
Corsica, and initial open-loop-control ex- periments are presented.
[1] J.R. Ferron, et al., Proc. 32nd EPS Conf. on Plasma Physics, vol. 29C (2005) 1069.
[2] Y. Ou, et al., Proc. Am. Control Conf., New York (2007).