Visual Operations of the Small- and Wide-Angle X-ray Scattering Beamline Utilizing Control System Studio

Abstract The 13A biological small- and wide-angle X-ray scattering beamline (SWAXS) at the Taiwan Photon Source (TPS), NSRRC, provides high-brilliance X-rays in the energy range from 4.0 to 23 keV (Liu et al., 2021; Shih et al. 2022). The beamline features an in-vacuum SAXS-WAXS detecting system comprising two mobile area detectors of Eiger X 9M and 1M in a large 12 m long and 1.5 m diameter vacuum vessel. The TPS 13A endstation adopts the Experimental Physics and Industrial Control System (EPICS) for integrated beamline hardware and software controls, including all motors and components. In this work, we show the design of a graphic operation interface for the two-detector system (of a position-encoder system) for a combined scattering vector q -range based on a graphical user interface of Control System Studio (CSS). The interface includes visual displays of the positions of the two detectors in the vacuum vessel and the three beamstop positions with respect to the simulated Eiger X 9M SAXS detector. The visualized detector control system provides convenient and efficient operations in relocating the two detector positions.