Design And Analysis Of High Energy Resolution End Station System For Resonant Inelastic X-ray Scattering

After several decades of development,Resonant Inelastic X-ray Scattering(RIXS)technology has quickly become one of the most powerful tools for studying the properties of materials,and has become a new spectroscopy detection tool.At present,the RIXS end station has been included in the national “Twelfth Five-Year Plan” major scientific and technological infrastructure project,and it is of great significance to independently develop China’s first large-scale scientific device for RIXS technology.In this paper,the high energy resolution requirements of RIXS measurement experiments are mainly carried out in the following three aspects: 1)RIXS optical design and simulation;2)mechanical design of RIXS end station;3)Research on high-precision control methods for the relative spatial position of RIXS detector.First,according to the requirements of the RIXS measurement experiment,a set of RIXS optical paths that meet the requirements of use were designed by using the ray tracing method.In the beamline,the luminous flux is improved by adding an ellipsoidal mirror.In the spectrometer,the solid angle imaging formula and the grating equation are used to realize the none-aberration of the spot imaging.The feasible parameter design results of the main optical components are given,and the requirements of the mechanical structure of the RIXS end station are proposed.Then,according to the mechanical requirements,a structural design scheme of the RIXS end station with long-distance vibration feedback control is proposed.The key technologies and working principles of each module of the end station are expounded,and the key components are designed and calculated in detail.By means of the finite element analysis method,the strength and stiffness of the trusses are analyzed and checked,which further improves the stability of the end station structure.Finally,the piezoelectric actuator is selected as the vibration feedback control actuator to ensure the relative spatial position stability of the CCD detector.In order to further improve the control effect,the hysteresis nonlinear characteristic of the piezoelectric ceramic material is effectively suppressed by a feedforward control method,and the positioning accuracy of the piezoelectric actuator is improved.This method has done a preliminary work for designing a high-precision,high-stability CCD detector vibration feedback control system.In this paper,the research on the optical,structure and control of RIXS end station provides reference information for the development of China’s first RIXS end station system.