The 8th International Conference on Matter and Radiation at Extremes (ICMRE2025)

The shock-bubble interaction (SBI) process remains a significant and open topic of investigation due to its importance in a wide range of physical systems.  The SBI induced by isolated defects within the capsule in inertial confinement fusion (ICF), and the subsequent hydrodynamic instabilities, are considered a contributing factor to implosion performance degradation. However, the inherent three-dimensionality and nonlinearity of defects have hindered detailed studies of their evolution. This paper utilizes a three-dimensional (3D) planar shell model driven by laser to study this problem, incorporating isolated low-density defects at various locations within the shell. The vortical dynamics of SBI from 3D spherical and cylindrical defects are revealed. The 3D vortex ring motion induced by spherical defects was found to be significantly faster, resulting in less influence on the ablation front compared to the cylindrical defect under the same conditions, instead producing jets penetrating into the shell interior.  A systematic study of localized perturbation growth as a function of 3D defect placement, size is presented.

inertial confinement fusion,,shock-bubble interaction,hydrodynamic instabilities