Abstract
To achieve high density implosions from direct- drive laser fusion it is crucial that the irradiance nonuniformities over the surface of the target be restricted to less than a few percent.1 Recent studies, utilizing a 2-D hydrodynamic simulation code and a 3-D beam superposition code, have been performed to assess the sensitivity of the hydrodynamic performance of certain target designs to target irradiance and various sources of nonuniformity; beam-to-beam energy imbalance, beam mispointing, single beam intensity fluctuation, and the fixed 24-beam (F/3.5) geometry. This sensitivity analysis, together with an experimental characterization of these major sources, has shown that irregularities in each of the 24-beam profiles are the dominant causes for irradiation nonuniformity.2
© 1986 Optical Society of America
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