Investigation of hydrodynamic stability of OMEGA low-adiabat implosions using x-ray spectrally-resolved images recorded with MMI*

Spherical plastic shells doped with a titanium tracer-layer on the inner surface and filled with deuterium gas were driven at OMEGA with low-adiabat shaped laser pulses. The titanium x-ray emission is primarily emitted at the collapse of the implosion and recorded with the gated, multi-monochromatic x-ray imager (MMI) instrument. The spectrally-resolved image data were processed to obtain narrow-band images and spatially-resolved spectra based on the x-ray line emission of titanium.\footnote{T. Nagayama, R.C. Mancini, R. Florido, R. Tommasini, J. Koch, J. Delettrez, S. P. Regan, V. Smalyuk, J. App. Phys. \textbf{109}, 093303 (2011).} The narrow-band images reveal the spatial distribution of titanium in the implosion core and thus provide an indication of the hydrodynamic stability of the implosion. The spatially-resolved titanium line spectra can be analyzed to extract the spatial distribution of electron temperature and density, and mixing in the implosion core.