X-Ray Spectral Measurements of Cryogenic Capsules Imploded by OMEGA

A set of absolutely calibrated, x-ray imaging systems have been used to measure the emergent x-ray spectra from cryogenic D$_{2}$- and DT-filled capsules imploded by the OMEGA UV Laser System. The imaging systems include both pinholes and Kirkpatrick--Baez microscopes, all dispersed by transmission gratings. The shapes of the observed spectra allow for inference of the core electron temperature (\textit{kT}$_{e})$ and in selected cases the surrounding main-fuel-layer areal density (\textit{$\rho $R}$_{fuel})$. The latter determination is dependent on the assumed temperature and density in the fuel layer and hence can only place bounds on the quantity \textit{$\rho $R}$_{fuel}$. Comparisons of these measurements with both one- and two-dimensional hydrocode simulations are used in part to evaluate the performance of these implosions. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement DE-FC52-92SF19460.