Interfacial Mixing in Warm Dense Matter with a Multiphysics Kinetic Model

We have extended a recently developed multispecies, multitemperature BGK model [Haack et al., J. Stat. Phys., 168, (2017)] to include multiphysics capabilities that enable modeling of a wider range of physical conditions. We have included an atomic ionization model, accurate collision physics across coupling regimes, self-consistent electric fields, and degeneracy in the electronic screening. We apply the model to a warm dense matter scenario in which the ablator-fuel interface of an inertial confinement fusion target is heated, similar to the recent molecular dynamics study in [Stanton et al., submitted to PRX], but for larger length and time scales and for much higher temperatures. We observe hydrogen from the ablator material jetting into the fuel during the early stages of the implosion and compare the relative size of various diffusion components that drive this process. We also examine kinetic effects, such as anisotropic distributions and velocity separation, in order to determine when this problem can be described with a hydrodynamic model.