The TPS 13A biological small-angle X-ray scattering (BioSAXS) beamline under construction is equipped with 4-m IU24 undulator for X-rays in the energy range of E = 4-23 keV (covering the K-edge absorptions from Ca to Ru). The beamline aims for cutting-edge researches in biomacromolecular structures and kinetics, in solid and solution, covering a wide length scale from atomic to micrometer scale and time resolution down to μs. To achieve the goals, the beamline integrates double-multilayer and double-crystal monochromators (DMM/DCM) to have an option of high flux of 4 × 1014 photons/s or a high energy resolution of ΔE/E = 1.5×10−4. The DCM together with a horizontal four-bounce crystal collimator (4BCC) will be implanted for low beam divergence to perform 2D ultra-SAXS (USAXS). To keep a common X-ray beam path of the operation modes, DMM and DCM are integrated into one rotating cradle in a same chamber for a common beam exit. Microbeam with reasonable beam divergence for SAXS/WAXS structural mapping will be realized with a virtual source defined by a set of high precision/stability slits and another set of K-B mirrors for a focus at the sample position with a demagnification close to 1.3:1. Two beam position monitors, with intensity and position feedbacks respectively to the virtual source slits and the 4BCC and a vertical deflection mirror, are used mainly to stabilize microbeam intensity and position within 1 μm in the vertical and horizontal directions. This TPS 13A BioSAXS beamline will be commissioning at the end of 2019.
Advanced small- and wide-angle x-ray scattering beamline for frontier research in biological structures at the Taiwan photon source
Din-Goa Liu, Chien-Hung Chang, Ming-Han Lee, Chin-Yen Liu, Chia-Feng Chang, Liang-Chih Chiang, Ching-Shiang Hwang, Jui-Che Huang, Albert Sheng, Chien-Kuang Kuan, Yi-Qi Yeh, Chun-Jen Su, Kuei-Fen Liao, Wei-Ru Wu, Orion Shih, U-Ser Jeng; Advanced small- and wide-angle x-ray scattering beamline for frontier research in biological structures at the Taiwan photon source. AIP Conf. Proc. 15 January 2019; 2054 (1): 060021. https://doi.org/10.1063/1.5084652
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