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Growth rates of the Rayleigh-Taylor instability in foils accelerated with a laser beam smoothed by induced spatial incoherence were measured and compared with hydrodynamic-code simulations. Modes with 150-and 100-/im wavelengths grew at predicted rates. However, no growth was experimentally observed at 50-/im wavelength. Code simulations suggest that induced spatial incoherence can influence the 50-/im Rayleigh-Taylor mode by delaying the start of its growth.

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