Tin Ejecta in Double Shock Experiments

Over the past couple decades much focus has been placed on Richtmyer-Meshkov Instabilities (RMI) as a source of ejecta from geometric features of a material surface. Recently, a new ejecta mechanism has been demonstrated which yields substantially faster, hotter, and more areal mass ejecta than RMI. This mechanism is known as Shallow Bubble Collapse (SBC). SBC ejecta has been studied extensively on single-stage powder guns at facilities such as NNSS-STL and DEOS; however, the drives achievable in these experiments have been limited. Here, we present results from the first SBC experiment on the HEAF two-stage light gas-gun. We present velocity, temperature, and areal mass inference for SBC ejecta from tin, with comparisons to hydrodynamic simulations. This experiment will enable future study of SBC ejecta at higher drives achievable using two-stage guns.



This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. We gratefully acknowledge the LLNL LDRD Program for partial funding support of this research under Project No. 21-SI-006.