Simulation and Analysis of Time-Resolved Narrowband Radiographs of Cryogenic Implosions on OMEGA

Spherical polymer shells containing cryogenic DT ice layers have been imploded on the OMEGA Laser System and radiographed with Al backlighter targets ($h\nu =$ 1.865 keV) driven with 20-ps IR pulses from the OMEGA EP Laser System. The shadows of the converging DT ice shells have been obtained using a time-resolved (40-ps) narrowband crystal imaging system and improved backlight intensity. Measured x-ray radiographs are compared with their 1-D \textit{LILAC} and \textit{Spect3D }simulations. Moments of the imploded radial mass distributions are inferred from radiograph analysis based on Abel inversion. The sensitivity of the radiograph shadows to trace contamination by fuel--shell mix tests the hydrodynamic stability of the implosions indicated by their shell adiabats and in-flight aspect ratios. This work was supported by the U.S. Department of Energy National Nuclear Security Administration under Award Number DE-NA0001944.