First observations of the Kr multi-monochromatic X-ray imager in OMEGA implosion experiments

This paper presents initial findings from the recently deployed Kr Multi-Monochromatic X-ray Imager (MMI) at the Omega facility. The experiment focuses on exploring implosion dynamics in exploding pusher capsules at three distinct initial gas fill densities. Utilizing time-gated and spatially integrated measurements, core size, electron temperature (Te), and electron densities (ne) are derived through the analysis of the spectral region encompassing the Kr Heα and its satellite lines. A comprehensive spectral database, incorporating atomic kinetics, radiation transport, and Stark broadening, has been developed for rigorous data analysis. These measurements underscore the utility of the new Kr MMI instrument, enabling the diagnosis of plasma conditions at Te > 2000 eV, thereby extending the capabilities beyond the prior Ar MMI design.