Extension of atomic configuration sets of the Non-LTE model in the application to the Kα diagnostics of hot dense matter

High intensity short-pulse laser experiments are used for various applications from fast ignitor concept to proton beam generation. These systems produce substantial fluxes of energetic electrons, and the production of Kα spectrum by these energetic electrons has become a key diagnostics of interaction of short-pulse laser and solid-density matter. In general, spectral modeling is required to derive the thermal electron temperature from measured Kα spectrum and it is essential to use a Non-LTE (local thermodynamic equilibrium) model for this purpose. In this paper, we investigate the assumptions necessary for the application of the Non-LTE models and show that an extensive set of configurations is required to provide a valid Kα diagnosis of hot dense matter.