Recent advances in Asay window ejecta momentum diagnostics

Asay windows with embedded reflectors offer higher dynamic range than traditional momentum diagnostics such as Asay foils and pins. When extending Asay window inferences into high areal mass ranges, however, many of the assumptions historically used in the analysis are invalid. Without accounting for phenomena such as elastic collisions, ejecta material accretion layer formation, and non-uniform impacts at the window surface, significant errors in mass and density inferences can arise. Here we present recent simulation and experimental results that improve the design, physical understanding and quantitative accuracy of Asay window diagnostics in ejecta experiments.