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It has recently been proposed that transport of energetic deuterium-tritionions (Knudsen layer), owing to their long mean free path, may deplete the tailof the velocity distribution in the vicinity of the Gamow peak and thus serveto greatly reduce the yield of an inertial confinement fusion (ICF) plasma[Molvig \emph{et al.}, \emph{Phys. Rev. Lett.}, 109:095001 (2012)]. Moleculardynamics simulations of the non-equilibrium response of a fusion plasma to iondistribution tail loss show that equilibrium is re-established extremelyrapidly, with ion tail replenishment complete in less than 1 ps for $\rho r >0.01$. The exceedingly fast relaxation of the fusion plasma dynamics, relativeto the Fokker-Planck collisional operator, can be understood in terms of alarge entropic driving force that pushes the phase space distribution toward aMaxwellian, and is a characteristic of the Lyupanov instability for the Coulombsystem. The thermal reactivity $\langle \sigma v \rangle$ for theD(t,n)$\alpha$ fusion reaction is calculated as a function of progress towardequilibrium for a series of densities relevant to ICF hot spot ignition.

Non-Equilibrium Response of Deuterium-Tritium Fusion Plasma: Molecular Dynamics Study of Ion Tail Replenishment