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An ultra-thin layer of uranium nitrides (UN) has been coated on the innersurface of the depleted uranium hohlraum (DUH), which has been proved by ourexperiment can prevent the oxidization of Uranium (U) effectively. Comparativeexperiments between the novel depleted uranium hohlraum and pure golden (Au)hohlraum are implemented on Shenguang III prototype laser facility. Under thelaser intensity of 6*10^14 W/cm2, we observe that, the hard x-ray (> 1.8 keV)fraction of this uranium hohlraum decreases by 61% and the peak intensity oftotal x-ray flux (0.1 keV ~ 5.0 keV) increases by 5%. Radiation hydrodynamiccode LARED is used to interpret the above observations. Our result for thefirst time indicates the advantage of the UN-coated DUH in generating theuniform x-ray field with a quasi Planckian spectrum and thus has importantimplications in optimizing the ignition hohlraum design.

A novel hohlraum with ultrathin depleted-uranium-nitride coating layer for low hard x-ray emission and high radiation temperature