ANALYSIS OF K-SHELL AND L-SHELL SPECTRA FROM INDIRECTLY DRIVEN IMPLOSIONS

We report on the analysis of K- and L-shell spectra obtained from Ar and Xe dopants seeded into the fuel region of plastic capsules indirectly imploded using the Nova laser. Stark broadening of the Ar Ly-beta and He-beta lines is used to infer fuel electron density, while spatially averaged fuel electron temperature is deduced from the ratio of Ar Ly-beta to He-beta. A postprocessing code has been developed to simulate experimental spectra by taking into account spatial gradients and line transfer effects. It is shown that correct modeling of the x-ray emission requires a proper treatment of the coupled radiative transfer and kinetics problem. A recently developed diagnostic based on the lineshape of Ar He-beta and its associated dielectronic satellites is shown to provide a simultaneous measure of electron temperature and electron density. Comparisons of TOTAL and MERL line broadening calculations for this case are shown. L-shell Xe spectroscopy is under continuing development as an electron temperature and electron density diagnostic. Density and temperature sensitive ratios of spectral features each consisting of many lines have been identified. Observed Xe spectra from imploded cores show the same qualitative behavior with temperature as predicted by model calculations of Xe emission spectra.