Control of the Current Profile Evolution During the Ramp-Up Phase at DIII-D
Y. Ou, E. Schuster, J. Ferron, T.C. Luce, M.L. Walker, D.A. Humphreys, T.A. Casper, W.H. Meyer
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Dallas, Texas, November 17-21, 2008
Abstract
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Setting up a suitable current profile has been demon- strated to be a
key condition for advanced scenarios with improved confinement and
possible steady-state operation. Experiments at DIII-D focus on
creating the desired q profile during the plasma current ramp-up and
early flattop phases with the aim of maintaining this profile during
the subsequent phases of the discharge. Active feedback control of the
q profile evolution at DIII-D has already been demonstrated [1], and
an open-loop control scheme has been proposed [2] based on a simplified
control-oriented dynamic model [3]. The use of Corsica for both control
testing and design is reported, and results of open-loop current
profile control experiments are presented.
[1] J.R. Ferron, et al., Nucl. Fusion 46 (2006) L13.
[2] Y. Ou, et al., Proc. Am. Control Conf., New York (2007).
[3] Y. Ou, et al., Fusion Eng. & Design 82 (2007) 1153.