Nonlinear Robust Burn Control in Tokamaks with Uncertainties in the Fueling Lines via Lyapunov Redesign
A. Pajares and E. Schuster
American Control Conference
Seattle, WA, USA, May 24-26, 2017
Abstract
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In future burning-plasma tokamaks like ITER, one of the main problems
will be controlling the plasma density and temperature during long
pulses in order to regulate the fusion power density. Such problem,
known as burn control, requires the development of control algorithms
in which modulation of the deuterium (D) and tritium (T) fueling rates
may play an important role as an actuator. However, unmeasurable
variations of the D-T concentration are expected in the fueling lines
during such long-pulse operation. Therefore, there will be a need for
robust burn controllers that can regulate the plasma density and
temperature in spite of the presence of uncertainties in the D-T
concentration in the fueling lines. In this work, a nonlinear
controller is presented which is able to regulate the burn condition
even in the presence of the aforementioned uncertainties. The controller
performance is tested in simulations for a burning-plasma ITER-like
scenario.