With the increasingly strict requirements of the fourth-generation synchrotron radiation light source on the brightness and emittance of the beam, the impact of micro-vibration on the beam quality has gradually become prominent. However, there is still no unified standard for comprehensive testing and evaluating the impact of ground-based micro-vibrations, making the effective management and control of micro-vibration particularly difficult.

This study aims to evaluate the random characteristics of ground vibration and analyze the vibration sources in detail.

A spectral estimation-based model was developed for vibration data processing, and a method based on probability statistics was proposed to evaluate the displacement of ground micro-vibration. Then, triaxial force feedback velocity sensor (seismometer) was employed to test the micro vibration of foundation of Wuhan Advanced Light Source (WALS) pre-research site, and the vibration root mean square (RMS) displacement was comprehensively and objectively assessed by aforementioned approach.

The results indicate that the vertical vibration average RMS displacement of the isolated foundation in the experimental hall of WALS within the pre-research zone of WALS is 8.08 nm, with a σ value of 4.55 nm. It is noted that the vertical vibration displacement (ave RMS+3σ) reaches about 21.73 nm, which satisfies the 40 nm requirement.

This vibration data processing method proposed in this study is appropriate for evaluating the vibrations of the original background and isolated treatment foundation, as well as for analysis of vibration sources at the component level.