Several targets are described that in simulations give yields of 1–30 MJ when indirectly driven by 0.9–2 MJ of 0.35 μm laser light. The article describes the targets, the modeling that was used to design them, and the modeling done to set specifications for the laser system in the proposed National Ignition Facility. Capsules with beryllium or polystyrene ablators are enclosed in gold hohlraums. All the designs utilize a cryogenic fuel layer; it is very difficult to achieve ignition at this scale with a noncryogenic capsule. It is necessary to use multiple bands of illumination in the hohlraum to achieve sufficiently uniform x-ray irradiation, and to use a low-Z gas fill in the hohlraum to reduce filling of the hohlraum with gold plasma. Critical issues are hohlraum design and optimization, Rayleigh–Taylor instability modeling, and laser–plasma interactions.
The velocity autocorrelation function and the binary diffusion coefficient of a single hard sphere test particle whose mass and size is less than that of the solvent are computed in the dense fluid phase. Large deviations from the Enskog theory of uncorrelated motion are found as the diffusion coefficient vanishes for the lighter and larger test particle at higher densities. Comparison with experimental values leads to the conclusion that the correlated motions observed in hard spheres correspond well to those observed in real systems.
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