Design and test of support for HEPS magnets

Purpose High Energy Photon Source (HEPS) has the characteristics of high energy and low emittance, which requires that the 1st natural frequency of the magnet support assembly should be better than 54 Hz and the moving resolution of girder should be less than 5 μm. The prototypes have been designed and fabricated to meet the requirements. Methods In the design process of the support system model, double-wedge adjusting mechanism and concrete plinth construction are adopted to meet the requirements of adjusting resolution and stability. The FEA and the dynamic stiffness testing technique are used to verify the rationality of the design model. The stability and motion performance tests are performed to verify that the prototype meets the design requirements. Results Experimental results show that, in all cases, the lowest first-order natural frequency of the support system is 55 Hz, the amplification between magnet and ground is less than 1.05 in the directions perpendicular to the beam, the moving resolution can reach 1 µm, and the girder can be locked in place with an error of less than 5 μm. Conclusion The prototype of HEPS support system meets the requirements of stability and motion performance. The girder body and wedge mechanism made with iron or steel have little influence on the stability of the support system. The accuracy of dynamic stiffness test and finite element simulation results is verified. Further test will be performed in the HEPS site to verify the performance.