Narrow-band x-ray imaging for core temperature and density maps retrieval of direct drive implosions

We present recent results using multi-monochromatic X-ray imaging of direct drive implosions at the OMEGA laser facility. An array of pinholes coupled to a flat multilayer mirror provides multispectral images distributed over a wide spectral range. Using Argon as a dopant in the DD-filled plastic shells produces emission images in the Ar He-β and Ly-β spectral regions. When used in conjunction with gated imaging detectors the instrument provides images with spatial resolution of ∼10μm and temporal resolution of ∼50ps. A special algorithm has been developed to reconstruct narrow-band images, which will allow the retrieval of temperature, and density maps of the core as it evolves through peak compression.