Preliminary exploration of hard X-ray coherent diffraction imaging method at SSRF

作者：Guangzhao Zhou, Zhe Hu, Shumin Yang, Keliang Liao, Ping Zhou, Ke Liu, Wenqiang Hua, Yuzhu Wang, Fenggang Bian, Jie Wang · 发表于：Acta Physica Sinica · 年份：2020 · DOI：10.7498/aps.69.20191586 · 被引用次数：4 · 研究领域：Advanced X-ray Imaging Techniques、Advanced Electron Microscopy Techniques and Applications

Coherent X-ray diffraction imaging (CDI) method is a powerful X-ray imaging technique with high resolution up to nanometer scale. Most of the synchrotron radiation facilities and free electron laser facilities are equipped with this state-of-the-art imaging technique and have made many outstanding achievements in multiple scientific areas. Up to now, although scanning CDI (ptychography) method based on a soft X-ray source has been opened to users, the hard X-ray CDI experimental platform has not been built at Shanghai Synchrotron Radiation Facility (SSRF) which can research some relatively thick specimens and easily extend to three-dimensional imaging. As some new beamlines with undulator source were put into operation recently, it is possible and feasible to build up the CDI experimental platform with hard X-ray. In this article, we report the hard X-ray CDI experimental platform development process and preliminary experimental results of coherent diffraction pattern and image reconstruction at SSRF. Based on the operating BL19U2 biological small-angle X-ray scattering (SAXS) beamline at SSRF, the hard X-ray coherent beam is obtained through effective optical path designation at 12 keV and 13.5 keV. The hard X-ray optimization includes tuning several slits, double crystal monochromator (DCM), horizontal deflection mirror, focusing mirror system and pinhole, etc. Furthermore, hard X-ray CDI experiments are conducted. The spatial coherent length of the incident beam is also me...