The Third Line-of-Sight Time-Gated X-Ray Imager for OMEGA DT Cryogenic Implosions

A 3-D view of the hot-spot is crucial for understanding the evolution of the hot spot and the multidimensional effects that occur during inertial confinement fusion implosions. OMEGA currently has two time-gated x-ray imagers: a time-resolved Kirkpatrick--Baez x-ray microscope [F. J. Marshall et al., Rev. Sci. Instrum. 88, 093702 (2017)] and the single-line-of-sight, time-resolved x-ray imager (SLOS-TRXI) [W. Theobald et al., Rev. Sci. Instrum. 89, 10G117 (2018)]. A time-gated hot-spot x-ray imager is being developed for use on OMEGA as a third line of sight that will follow the SLOS-TRXI concept but will have improved spatial and temporal resolutions of $\le $5 $\mu $m and 10 ps, respectively. The diagnostic requirements and an optimized design will be presented. The self-emission from the hot spot from multiple lines of sight will be analyzed and combined to infer the electron temperature, internal pressure, and to create a low-mode reconstruction of the hot-spot region. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.