Determining the spatially resolved hot-spot conditions of Kr-doped implosions at the National Ignition Facility*

Inertial confinement fusion implosions at the National Ignition Facility (NIF) have achieved significant alpha-particle self-heating. The ion temperatures inferred from deuterium-tritium (DT) reactions are higher than predicted by theory or simulations with a leading hypothesis for those high inferences being residual kinetic energy in the hot spot in the form of fluid velocity flows and turbulence. Due to the high thermal velocity of electrons, electron temperature measurements are not sensitive to residual kinetic energy effects. The Mass-Temperature Distribution using Spectroscopy (MTDS) platform at the NIF is designed to characterize the hot-spot electron temperature and electron density using a combination of x-ray spectroscopy and x-ray imaging. We present experimental results from the MTDS platform, demonstrating the ability to constrain the spatially resolved hot-spot profile using Markov Chain Monte Carlo analysis of multiple independent diagnostics.