Ultrafast X-ray diffraction development at high repetition rate in Beijing synchrotron radiation facility

Abstract Background: Time-resolved experiments could provide a dynamical insight into the structure of materials. The ultrafast X-ray diffraction (UXRD) technique is a common way in time-resolved experiment with the laser pump and the X-ray probe method. Purpose: This study aims to perform the UXRD experiments with the high repetition rate pump laser. Methods: A picosecond resolution UXRD setup on high repetition rate laser pump at Beijing Synchrotron Radiation Facility (BSRF) was built and a test with the sample SrRuO₃ (SRO) grown on the substrate SrTiO₃ (STO) was performed at the repetition rate of 310 kHz. Some exploratory experiments on the static heating problem accompanied by high repetition rate photoexcitation were discussed briefly. Results: Compared with the previous 1-kHz repetition rate measurement, the signal to noise ratio (SNR) of those at 310 kHz was improved dramatically. And a cooling system was necessary for the overheating problem. Conclusion: Those UXRD experiments at BSRF were performed at high repetition rate, which laid a foundation for the future work. (authors)