Nonlinear Burn Control Using In-vessel Coils and Isotopic Fueling in ITER
A. Pajares and E. Schuster
Fusion Engineering and Design, 123 (2017) 607–611
Abstract
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In future burning tokamaks, active control of the plasma temperature
and density will be necessary to produce a determined amount of fusion
power. Conventional actuation methods, such as auxiliary power
modulation and fueling rate modulation, are usually employed to tackle
this so-called burn control problem. Fueling rate modulation can be
used not only to directly control the plasma density but also to
indirectly control the plasma energy by means of isotopic fuel tailoring.
Moreover, based on recent experiments, the in-vessel coil system arises
as a possible actuation method to decrease the plasma energy by
generating non-axisymmetric fields in the plasma that may reduce the
energy confinement time. In this work, a nonlinear burn controller that
integrates the three mentioned actuators is proposed. The controller
performance is tested via simulations for an ITER-like scenario.