X-ray Thomson Scattering from Spherically Imploded ICF Ablators

Time-resolved X-ray Thomson scattering measurements from spherically imploded inertial fusion capsules-type targets have been obtained for the first time at the Omega OMEGA laser facility to characterize the in-flight properties of ICF ablators. In these experiments, the non-collective, or microscopic particle behavior, of imploding CH and Be shells, was probed using a 9 keV Zn He-alpha x-ray source at scattering angles of 113$^{\circ}$ and 135$^{\circ}$. for two drive pulse shapes.As an example, the analysis of In-flight scattering measurements from one set of directly-driven compressed 8600 $\mu $m-diameter, 40-$\mu $m thick Be shells taken (4.2 ns after the start of the compression beamswhen compressed a factor of $\approx $ 4.83x) yielded electron densities of $\sim $ 1.2$\pm $0.23x10$^{24}$cm$^{-3}$, temperatures of $\sim $13$\pm $32 eV, and an ionization state of Be(+2), with uncertainties in the temperature and density of about 40{\%} and 20{\%}. These conditions resulting in an inferred adiabat (ratio of plasma pressure to Fermi degenerate pressure) of 1.797 +0.3/-.5 with an error of about 30{\%}. The high signal-to-noise and high signal-to-background ratio of data obtained in these experiments provides a platform for studying the adiabat of other indirect-drive ICF ablators such as CH and High Density Carbon (HDC) ablators and demonstrates the viability of using this diagnostic to study the in-flight properties adiabat of implosion targets at the National Ignition Facility (NIF).