Experimental and Simulation Testing of Physics-model-based Safety Factor Profile and Internal Energy Feedback Controllers in DIII-D Advanced Tokamak Scenarios
J. Barton, M.D. Boyer, W. Shi, W. Wehner, E. Schuster, J.R. Ferron, M.L. Walker, D.A. Humphreys, T.C. Luce, F. Turco, R.D. Johnson and B.G. Penaflor
19th IFAC World Congress
Cape Town, South Africa, August 24-29, 2014
Abstract
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Active closed-loop control of the plasma safety factor profile
(q-profile) and internal energy dynamics in nuclear fusion tokamak
devices has the potential to significantly impact the success of the
ITER project. These plasma properties are related to both the
stability and performance of a given plasma operating scenario. In
this work, we develop integrated feedback control algorithms to
control the q-profile and internal energy dynamics in DIII-D advanced
tokamak (high performance) scenarios. The feedback controllers are
synthesized by embedding a nonlinear, physics-based, control-oriented
partial differential equation model of the plasma dynamics into the
control design and to be robust to uncertainties in the plasma electron
density, electron temperature, and plasma resistivity profiles. The
auxiliary heating and current-drive system and the total plasma current
are the actuators utilized by the feedback controllers to control the
plasma dynamics. Finally, the feedback controllers are tested both
through simulations based on the physics-based model and experimentally
in the DIII-D tokamak.