Preheat and ablation broadening due to nonthermal electron energy transport in NIF like targets.

Over the past few years, the NRL theory group has presented and published a variety of theoretical works on the effect of nonlocal electron energy transport on fuel preheat and ablation layer broadening in direct drive laser fusion targets. The goal is not an exact model arrived at by say a Monte Carlo simulation, but rather a model accurate enough and simple enough that it can be utilized at each time step of a fluid simulation. This work focuses on the instability generated energetic electrons, from the 2 omega p instability (OMEGA) or from the Raman side scatter instability (NIF). It looks into the preheat and ablation layer broadening specifically for structured targets like those spherical targets shot on the NIF facility by the URLLE and NIF group. So far, the results agree reasonably well with the experimental results. Also, the theory can be similarly formulated for the nonlocal deposition from the energetic tail of a Maxwellian.