Physics-model-based Actuator Trajectory Optimization and Feedback Control of the Plasma Safety Factor Profile and Internal Energy Dynamics in DIII-D
J.E. Barton, E. Schuster, M.L. Walker and D.A. Humphreys
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Denver, Colorado, USA, November 11-15, 2013
|
Abstract
|
|
Simulation and experimental results in DIII-D are presented to
demonstrate the potential of integrated physics-model-based q profile
and internal energy control algorithms for system- atic attainment and
repeatability of discharges. Both simulations and experiments
demonstrate improved profile control accuracy relative to open loop
(feedforward) control alone, by using a combined feedforward +
feedback scheme. The scheme is constructed by embedding a nonlinear,
first-principles-driven, physics-based model of the plasma dynamics
into the control design process. Firstly, a tool to numerically
design actuator trajectories that steer the plasma to a desired
operating state (feedforward) is developed with the objective of
supporting the traditional trial-and- error experimental process of
advanced scenario planning. Secondly, an algorithm to track a desired
q profile and internal energy evolution (feedback) is developed with
the goal of adding robustness to the control scheme.
