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A two-dimensional Fokker-Planck code SPARK has been constructed to study the process of nonlocal thermal smoothing in planar laser-produced plasmas with no ion motion. The results from SPARK are compared with those from a standard fluid code with flux-limited Spitzer-H\"arm conductivity. It is found that even when the one-dimensional transport is well modeled by fluid theory the thermal smoothing arising from nonuniform laser energy deposition may be severely overestimated for scale-length modulations shorter than about 80 electron mean free paths.
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Epperlein et al. (1988) studied this question.
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