Plasma Shape Control for ITER
In this chapter we show that the configuration of the ITER tokamak enables the design of a low-order controller based on the fact that the vertical position control and the plasma current and shape control can be performed on different time scales. This time-scale separation is exploited in order to obtain a reduced-order model for the design of the current and shape control via a singular perturbation decomposition. An important feature of our approach is that, with respect to other reduction procedures (such as Hankel norm approximation, balanced truncation, etc.), the singular pertubation decomposition allows us to retain the physical meaning of the state variable. The designed current and shape controller is a multivariable PI; it is able to guarantee a prescribed input–output behaviour to the closed-loop system.
KeywordsControl Voltage Plasma Current Balance Truncation Central Solenoid Shape Controller
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