2020同步年報

106 ACTIVITY REPORT 2020 Fig. 11 : Beamline TPS 47A concept drawing with undulator, DCM, high-resolution monochromator and focusing mirror. Two endstations—ES1: HER-XAS and ES2: HAXPES—are to be built at this beamline. structure and spin states of materials studied for user research on a wide range of hard X-ray energy (including 3d, 4d K edge and 5d L edge). The multi-analyz- er system can significantly improve the efficiency of data collection and cover a wide energy range of measurements at the HER-XAS endstation. The HAXPES endstation exhibits a high penetration depth and bulk-sensitive spectra using hard X-rays, and provides the electronic structure of the inner layer or interface of High-Resolution Powder X-ray Diffraction T PS 19A is a dedicated powder X-ray diffraction beam- line, which was designed particularly for structure determination and structural dynamics in situ . It includes a high-resolution station ( TPS 19A1 ) and a general-resolu- tion station ( TPS 19A2 ) for diverse scientific purposes and applications. TPS 19A was planned not only to investigate an average structure for periodic crystalline systems but also to analyze the local structures of nano- and amorphous materials. Rapid and high-resolution diffraction with atomic pair distribution function (PDF) was therefore both consid- ered and proposed. As expected, powder diffraction is an essential and mature technique for material science, but we devoted effort to keep the design cover both innovative and conservative. A great breakthrough was made to use a cryogenic undulator in vacuum (CU15, length 2 m) as a radiation source. CU15 was the first to be operated near liquid-nitrogen temperature (83 K) in TPS and was made by our magnet group. 1 Based on the character of CU15, the X-ray energy of 19A can cover from 10 to 40 keV, which will create extensive experimental possibilities for diverse research fields. The beamline specifications are shown in Table 1 . From 2018 to 2020, after beamline construction for three years, 19A has been ready for commissioning and invited experiments and open for user operation (10%) in Photon energy range 10 － 40 keV Photon flux @ 10 keV > 10 13 photons/s Energy resolution Δ E / E < 10 -4 Beam size 500 x 500 μm 2 20 x 20 μm 2 (focused beam) Detectors • Multi-crystal analyzer • MYTHEN 18K • XRD1611 Table 1 : Specifications of TPS 19A high-resolution powder X-ray diffraction beamline. the sample. The liquid-solid interface sample under nearly ambient pressure experiment can also be performed in our HAXPES endstation. Both experi- mental endstations will be introduced and installed with various experimental environments in situ/operando , such as applied bias, electrochemistry, high pressure and temperature dependent, etc . We expect that these two endsta- tions will greatly help not only for user research in energy and semiconductor study but also for industrial applica- tions. The schematic drawing of the beamline is shown in Fig. 11 . (Report- ed by Gung-Chian Yin, Chun-Hsiang Huang, Chun-Jen Su, Yen-Chung Lai, Chi-Liang Chen, Wen-Bin Wu, Shu-Chih Haw, Ting-Shan Chan, Chia-Hsin Wang, and Yen-Fa Liao) 2021 Q1. The preliminary commissioning results appear in Fig. 1 . The gap of CU15 can be decreased to a really chal- lenging value, 4.5 mm. It can provide an extremely bright X-ray photon flux. The detailed experimental conditions and non-ambient devices provided are listed in Table 2 ; high or low temperature, high pressure, gas or solvent loading system, electrochemistry are all integrated to the data collection program, and user-friendly and easy data reduction macros are also provided. The first endstation, the so-called high-resolution powder X-ray diffraction station, has been operated in TPS 09A