Research On High Stability Technology Of Synchrotron Radiation In Double Crystal Monochromator

As a new type of light source,synchrotron radiation has excellent characteristics and has been widely used in various basic disciplines.With the development of scientific research,more and more attention has been paid to the stability of synchrotron radiation.Improving the stability of synchrotron radiation has been the focus of research in recent years.This article mainly studies the three factors that affect the stability of the crystal in the double crystal monochromator.The main contents are as follows:First,the influence of the crystal fine-tuning mechanism on the stability of synchrotron radiation is studied,and the first-order natural frequency is proposed as the evaluation parameter of the stability of the crystal fine-tuning mechanism.The first-order modes of the three flexure hinge mechanisms are compared,and the more stable is selected.The high four-bar linkage mechanism is used as the crystal fine-tuning mechanism,and then the factors affecting its first-order natural frequency are analyzed,and finally the pivot structure is introduced to replace the straight-circle flexible hinge mechanism,which can more effectively improve the stability of the crystal fine-tuning mechanism and achieve synchronization High stability of radiation.Then the cooling system of the first crystal in the double crystal monochromator was studied,and it was concluded that the vibration of the pipe would affect the stability of the crystal.The two-way fluid-solid coupling theory and its finite element analysis method are introduced,and the elbows,hoses and U-shaped pipe structures appearing in the cooling system are simulated and analyzed.The pipe wall nodes are selected as monitoring points,and the vibration characteristics are affected.Factors such as pipe radius,thickness,angle,etc.were compared and analyzed separately,which provided a theoretical basis for pipeline vibration damping design and optimization.Finally,the influence of the supporting platform in the dual-crystal monochromator on the structural stability is analyzed.In the work of the dual-crystal monochromator,high-frequency vibration isolation is required.The theory of vibration isolation and single-degree-of-freedom vibration isolation system are introduced,and the use of IPL vibration isolation pads to isolate high-frequency effects is proposed.Comparing the modal analysis and random vibration analysis under unsupported base,three-point support and four-point support,it is concluded that the four-point support has a better high-frequency vibration isolation effect,and a IPL 25 vibration damping pad is selected for the support structure.This paper analyzes three factors that affect the stability of the dual-crystal monochromator,and further analyzes all aspects of the factors,and proposes a method to improve the stability of synchrotron radiation,which provides a theoretical basis for future research.