Physics-model-based Control of the Plasma Current Profile Dynamics for the Development and Sustainment of Advanced Scenarios in DIII-D
J.E. Barton, M.D. Boyer, W. Shi, W.P. Wehner, E. Schuster, J.R. Ferron, M.L. Walker, D.A. Humphreys, T.C. Luce, B.G. Penaflor, R.D. Johnson
IAEA Fusion Energy Conference
Saint Petersburg, Russia, October 13-18, 2014
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Abstract
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DIII-D experimental results are reported to demonstrate the potential
of physics-model-based q-profile control for robust and reproducible
sustainment of advanced scenarios. In the absence of feedback control,
variability in wall conditions and plasma impurities, as well as
drifts due to external disturbances, can limit the reproducibility of
discharges with simple pre-programmed scenario trajectories. The
control architecture utilized is a feedforward + feedback scheme where
the feedforward commands are computed off-line and the feedback
commands are computed on-line. Good agreement between experimental
results and simulations demonstrates the accuracy of the models
employed for physics-model-based control de- sign. Additionally, the
results indicate the need for integrated q-profile and normalized beta
(βN ) control to further enhance the ability to achieve robust
scenario execution, which is a subject of ongoing work.
