Self-Consistency of Stark Broadening Predictions in a Multi-Element HED Plasma*

The interpretation of spectral line shapes for plasma characterization is well established as a diagnostic technique for determining plasma density.Specifically,Stark broadening is often used to diagnose a plasma’s electron density via a tracer element.We are interested in improving Stark broadening models and their ability to predict the plasma density from multiple elements within the same plasma self-consistently.To do so,we diagnose transmission spectra through ~0.4-um-thick Mg-NaF foil on Sandia’s Z facility.This foil is tamped with varying amounts of CH, allowing for electron densities of 1x10²¹-1x10²² cm^-3.The foil is heated such that He-like charge states were reached for all three elements,allowing for investigation of Multi-element Stark broadening.The amount of broadening found from different elements will be discussed further.