We report on the development of a new experimental instrument for time-resolved x-ray scattering\n(TRXS) at the Pohang Light Source (PLS-II). It operates with a photon energy ranging from 5 to\n18 keV. It is equipped with an amplified Ti:sappahire femto second laser, optical diagnostics, and\nlaser beam delivery for pump-probe experiments. A high-speed single-element detector and high\ntrigger-rate oscilloscope are used for rapid data acquisition. While this instrument is capable of\nmeasuring sub-nanosecond dynamics using standard laser pump/x-ray probe techniques, it also takes\nadvantage of the dense 500 MHz standard fill pattern in the PLS-II storage ring to efficiently record\nnano-to-micro-second dynamics simultaneously. We demonstrate this capability by measuring both\nthe (fast) impulsive strain and (slower) thermal recovery dynamics of a crystalline InSb sample\nfollowing intense ultra fast laser excitation. Exploiting the full repetition rate of the storage ring\nresults in a significant improvement in data collection rates compared to conventional bunch-tagging\nmethods.
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