Investigation on X-ray redistribution in cylindrical cavity

Summary form only given. Radiation energy transport and X-ray redistribution inside a high-Z hohlraum is a key in indirect-drive inertial confinement fusion. Experiments on x-ray redistribution along axis of gold cylindrical cavities have been performed on Xinguang-II laser facility. A time-resolved two-chroma X-ray imager has been set up, with time resolution of 12.6 ps and spatial resolution of 70 /spl mu/m. Radiation energy transport efficiency of 6% is obtained for the 400/spl times/1200/spl mu/m cylindrical cavity heated by an X-ray source with radiation temperature of 118 eV. Experimental scaling relation between thermal radiation delay time of the cavity inner wall and the incident X-ray intensity is also deduced. Comparison between the experimental results and a code predication has been made. Analysis of the angular distribution of X-ray intensity at the open end of the cavity indicates that the blow-off plasmas from cavity wall have influence on the angular distribution.