Stabilization for an ensemble of half-spin systems

Details Stabilization for an ensemble of half-spin systems Stabilization for an ensemble of half-spin systems

2010-07-08

arxiv.org/abs/1007.1334v1

Automatica 48, pp.68-76, 2012

Mathematics

Optimization and Control

Scientific paper

Feedback stabilization of an ensemble of non interacting half spins described by Bloch equations is considered. This system may be seen as a prototype for infinite dimensional systems with continuous spectrum. We propose an explicit feedback law that stabilizes asymptotically the system around a uniform state of spin +1/2 or -1/2. The proof of the convergence is done locally around the equilibrium in the H^1 topology. This local convergence is shown to be a weak asymptotic convergence for the H^1 topology and thus a strong convergence for the C^0 topology. The proof relies on an adaptation of the LaSalle invariance principle to infinite dimensional systems. Numerical simulations illustrate the efficiency of these feedback laws, even for initial conditions far from the equilibrium

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