Rosseland Mean Opacity of a High—Z Mixture Palsma

An eight-beam 0.351-μm laser with pulse duration of about 1.0ns and energy of 260J per beam was injcted into a cylindrical cavity to generate intense x-ray radiation on the Shengguang Ⅱ high power laser facility.A mixture foil of gold and gadolinium and a gold foil were attached on portion of a diagnostic hole in the mid-plane of the cavity and ablated by the intense x-ray radiation.The propagating time of the radiation heat wave in the mixture and the pure gold foil were measured with soft-x-ray spectrometer and by adopting space-and time resolved measurement technolgoy,respectively,The results shows that the mixrue of gold and gadolinium has higher Rosseland mean opacity than the gold sample in our experiment.