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The stability of multiple-shell ICF targets

The Rayleigh-Taylor stability of a multiple-shell ICF target is investigated using a linear perturbation technique. The zero-order solution is provided by a one-dimensional, three-temperature computer code. The results are compared with a full two-dimensional calculation and the agreement is found to be very good. A simple estimate based on integration of the interface acceleration is shown to be surprisingly accurate in some respects but inadequate in others. The instability associated with the hydrodynamic implosion of the inner shell is shown to be capable of seriously degrading the gain of the target.