On Lyapunov boundary control of unstable magnetohydrodymanic plasmas
  Starting from a simple marginally stable model considered for Lyapunov based boundary control of flexible mechanical systems, we add a term driving an instability and prove that for an appropriate control condition the system can become Lyapunov stable. A similar approximate extension is found for the general energy principle of linearized magnetohydrodynamics. The implementation of such external instantaneous actions may, however, impose challenging constraints for fusion plasmas. 
H. Tasso, G. N. Throumoulopoulos
physics.plasm-ph