Design And Analysis Of The Magnetic Support System For Wuhan Light Source Storage Ring

Wuhan Light Source(WHPS)is preparing to build the fourth generation synchrotron radiation device with extremely low emittance.The horizontal natural emittance of the beam is close to the diffraction limit of soft X-ray.The physical design team puts forward high requirements on the position accuracy and vibration characteristics of the magnet support system to reduce the static and dynamic errors of the beam closed orbit.This article analyzes the design indicators and feasible solutions for the collimation installation and vibration response of the magnet support system,with the Girder II common frame support unit with the heaviest load as the research object.The research content includes the following aspects:(1)To complete the structural design of the magnet support system,the support system is gradually designed and optimized according to different functional modules in the form of four point support.The main focus is on the research of the support body,adjustment mechanism,and base,and the design of the support system for alignment adjustment and tunnel installation process.(2)In order to improve the accuracy of the modal simulation of the magnet support system and clarify the optimization direction in the design phase,this paper analyzes the stiffness of the vertical support mechanism with the weakest connection stiffness,builds the equivalent stiffness model based on the micro contact surface and Substructure method,explores the stress state of the joint bearing contact surface,and calculates the equivalent vertical stiffness according to the real contact area and contact stiffness,Substitute it into modal simulation as a constraint condition for the support.(3)Analyze the dynamic vibration characteristics of the support system,calculate the natural frequency and vibration mode of the support system,and obtain the optimal combination of influencing factors for the support through orthogonal optimization calculation.Analyze the response of the bracket to different excitation signals using harmonic response and spectral response.Exploring the possible extreme support states of the magnetic support system with four point support,it was found that three point support can affect the constraint stiffness and reduce the natural frequency of the support system.Therefore,an adjustment strategy was proposed to actively control the support state.(4)Develop a prototype of the magnetic support system and conduct experiments on the adjustment performance and dynamic stability requirements of the prototype.The motion performance test was conducted from three aspects: adjustment resolution,positioning accuracy,and locking variation.The results showed that the body has excellent rigidity and the adjustment function meets the design index requirements.The prototype of the magnetic support system was subjected to dynamic stability tests under various working conditions,and the measured modal results matched well with the simulation results,verifying the accuracy of the simulation model.The test results of the prototype indicate that its motion performance and stability meet the design indicators,verifying the rationality of the support system design.