Ejecta from double-shock loaded tin target by hohlraum radiation and plasma jet

Abstract

The phenomenon of mass ejection from shocked surface is a crucial issue in high-energy density physics and shock compression science. Ejecta from double-shock loaded metallic targets is important in some practical applications, but there are only a few research types on this aspect due to experimental difficulty. We proposed a new method of double-shock loading based on intense laser, that is, the laser is injected into a vacuum hohlraum to generate strong radiation and plasma jet simultaneously, and the target are respectively subjected to two shocks by these two different mechanisms. In the experiment, double-shock process was clearly observed by photonic Doppler velocimetry system, and the recompression of target due to the second shock was presented by x-ray photography. After the free surface was broken, the ejecta showed a unique multi-layer density structure for the first time. This work achieves effective double-shock loading with only one single laser pulse, which is valuable for understanding the metal damage under multiple shocks and the evolution of ejected materials. It also provides an experimental design for studying the material response in complex environments.