Numerical Simulation Study of Hybrid Fluid-PIC for Plasma Collision Process

This paper utilizes quasi-one-dimensional planar implosion model to investigate plasma collision, comparing hybrid fluid-PIC program ASCENT-H against one-dimensional hydrodynamic program MULTI-IFE. Our simulations reveal that ion interpenetration, evident in ASCENT-H, leads to a significant deviation from thermal equilibrium in ion velocity distribution and prolongs kinetic energy conversion time. This deviation markedly influences energy conversion and temperature distribution, resulting in a lower peak ion temperature and an expanded spatial distribution compared to fluid simulation predictions. Additionally, this study explores impact of asymmetric shell velocities on core temperature and its spatial distribution. Collectively, these findings enhance our comprehension of inertial confinement fusion (ICF) implosion process and mechanisms underlying hot spot formation.