부산대학교 도서관

When a sufficiently strong shock emerges from the free surface of a solid, micron-sized particles may be “ejected” from the tiny defects, grain boundaries or surface inclusions characteristic of real surfaces. If the solid surface bounds a gas or plasma such as an MTF or ICF target, the introduction of surface (perhaps high-Z) material into the gas or plasma may significantly alter its properties and behavior. The formation of ejecta particles has been the subject of both experimental measurements and computational modeling. Simple hydrodynamic drag models have been less than completely adequate, and recent work has explored hydrodynamic (such as Richtmyer-Meshkov) explanations. Less experimental work has been devoted to exploring ejecta particle transport in gas (or plasmas), and most of that work has been done in planar geometries. A new high precision, experiment, called the Damaged Surface Hydrodynamics Experiment, has been developed to explore transport of ejecta particles into gas (or plasma) in converging geometries, diagnosed by high resolution, fast, multi-frame imaging by proton radiography to inform the continuing development of transport models and validate current and future simulations.