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

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• 作者：Da-Rui Sun ; Guang-Lei Xu ; Bing-Bing Zhang ; Xue-Yan Du ; Hao Wang ; Qiu-Ju Li ; Yang-Fan Zhou ; Zhen-Jie Li ; Yan Zhang ; Jun He ; Jun-Hui Yue ; Ge Lei and Ye Tao
• 关键词：laser pump/X-ray probe ; ultrafast X-ray diffraction ; photo-induced strain
• 刊名：Journal of Synchrotron Radiation
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：23
• 期：3
• 页码：830-835
• 全文大小：731K
• ISSN：1600-5775

文摘

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.