SIAM Journal on Control and Optimization, Vol.55, No.4, 2305-2332, 2017
OPTIMAL CONTROL OF NON-SMOOTH HYPERBOLIC EVOLUTION MAXWELL EQUATIONS IN TYPE-II SUPERCONDUCTIVITY
We analyze the optimal control of an electromagnetic process in type-II superconductivity. The PDE-constrained optimization problem is to find an optimal applied current density, which steers the electromagnetic fields to the desired ones in the presence of a type-II superconductor. The governing PDE system for the electromagnetic fields consists of hyperbolic evolution Maxwell equations with a nonlinear and nonsmooth constitutive law for the electric field and the current density based on the Bean critical-state model. Through the use of the Maxwell theory, the semigroup theory, Helmholtz decomposition, and results on maximal monotone operators, we develop a mathematical theory including an existence analysis and first-order necessary optimality conditions for the nonsmooth PDE-constrained optimization problem.
Keywords:nonsmooth hyperbolic evolution Maxwell equations;Bean's critical-state model;type-II superconductivity;nonsmooth PDE-constrained optimization;existence analysis;optimality system