X-ray spectrum is a valuable method for studying the parameters of Z-pinch plasma. Especially for radiation opacity experiments by using Z-pinch dynamic hohlraum radiation source. In such experiments, Al/Fe samples are placed at the axial exit of the dynamic hohlraum, the long pulse (~6 ns), large volume radiation during Z-pinch implosion phase is used to heat the samples up to 80-100 eV, whereas the short pulse (~1.5 ns), high temperature point radiation source during the stagnation phase is used to backlight samples. The radiation opacity can be obtained by measuring the absorption and backlighting spectrum. A timed-resolved X-ray spectroscopy diagnostic system, which include 6 slits, a Be foil filter, a convex cylindrical crystal and MCP detectors, is established on our 10 MA pulse-power facility. Time-resolved X-ray absorption spectrum of samples have been obtained. The system is able to obtain 6 spectra in single-shot with time-resolution better than 2 ns. Time-integrated X-ray spectra are also measured using imaging plate. Finally, we have analyzed the experimental spectral line of samples, investigated the temperature/density and opacity of sample plasma at different times.

z-pinch,X-ray spectral