Rayleigh--Taylor Measurements in Planar CH and SiO$_{2}$ Foils on OMEGA

Understanding how areal-density modulations grow at unstable ablative Rayleigh--Taylor (RT) interfaces is crucial to achieving inertial confinement fusion ignition. Recent planar RT experiments demonstrated increased stabilization in CH targets driven at high intensities (1 $\times $ 10$^{15}$ W/cm$^{2})$ compared to simulations. Planar experiments were preformed on the OMEGA laser using CH, SiO$_{2}$, and CH-SiO$_{2}$ targets with 2-D modulations (imprinted by drive beams or pre-imposed) using shaped drive pulses at high (1 $\times $ 10$^{15}$ W/cm$^{2})$ and low (5 $\times $ 10$^{14}$ W/cm$^{2})$ intensities. The temporal growth of these modulations was measured with face-on x-ray radiography using Pd and Dy x-ray backlighters. Experimental results will be compared with simulations. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement DE-FC52-08NA28302.