Implementation of ultrafast X-ray diffraction at the 1W2B wiggler beamline of Beijing Synchrotron Radiation Facility

• Published in: Journal of synchrotron radiation Vol. 23; no. 3; pp. 830 - 835
• Main Authors: Sun, Da-Rui, Xu, Guang-Lei, Zhang, Bing-Bing, Du, Xue-Yan, Wang, Hao, Li, Qiu-Ju, Zhou, Yang-Fan, Li, Zhen-Jie, Zhang, Yan, He, Jun, Yue, Jun-Hui, Lei, Ge, Tao, Ye
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.05.2016
• Subjects: laser pump/X-ray probe; photo-induced strain; ultrafast X-ray diffraction; ultrafast X-ray diffraction; photo-induced strain; laser pump/X-ray probe
• ISSN: 1600-5775; 1600-5775
• DOI: 10.1107/S1600577516004252

The implementation of a laser pump/X‐ray probe scheme for performing picosecond‐resolution X‐ray diffraction at the 1W2B wiggler beamline at Beijing Synchrotron Radiation Facility is reported. With the hybrid fill pattern in top‐up mode, a pixel array X‐ray detector was optimized to gate out the signal from the singlet bunch with interval 85 ns from the bunch train. The singlet pulse intensity is ∼2.5 × 106 photons pulse−1 at 10 keV. The laser pulse is synchronized to this singlet bunch at a 1 kHz repetition rate. A polycapillary X‐ray lens was used for secondary focusing to obtain a 72 µm (FWHM) X‐ray spot. Transient photo‐induced strain in BiFeO3 film was observed at a ∼150 ps time resolution for demonstration. A laser pump/X‐ray probe system has been established for picosecond resolution X‐ray diffraction detection at wiggler beamline 1W2B at the BSRF parasitic lightsource.