%A Chang-Qing Zhu(朱常青), Jun-Hao Tan(谭军豪), Yu-Hang He(何雨航), Jin-Guang Wang(王进光), Yi-Fei Li(李毅飞), Xin Lu(鲁欣), Ying-Jun Li(李英骏), Jie Chen(陈洁), Li-Ming Chen(陈黎明), and Jie Zhang(张杰) %T Ultrafast structural dynamics using time-resolved x-ray diffraction driven by relativistic laser pulses %0 Journal Article %D 2021 %J Chin. Phys. B %R 10.1088/1674-1056/ac0baf %P 98701-098701 %V 30 %N 9 %U {https://cpb.iphy.ac.cn/CN/abstract/article_123889.shtml} %8 2021-08-19 %X Based on a femtosecond laser plasma-induced hard x-ray source with a high laser pulse energy (>100 mJ) at 10 Hz repetition rate, we present a time-resolved x-ray diffraction system on an ultrafast time scale. The laser intensity is at relativistic regime (2×1019 W/cm2), which is essential for effectively generating Kα source in high-Z metal material. The produced copper Kα radiation yield reaches to 2.5×108 photons/sr/shot. The multilayer mirrors are optimized for monochromatizating and two-dimensional beam shaping of Kα emission. Our experiment exhibits its ability of monitoring the transient structural changes in a thin film SrCoO2.5 crystal. It is demonstrated that this facility is a powerful tool to perform dynamic studies on samples and adaptable to the specific needs for different particular applications with high flexibility.