The length of the photon beam transportation of Shanghai High repetitioN rate XFEL and Extreme light facility (SHINE) exceeds 1 km, the angular vibration of reflecting mirrors would be magnified at the endstations due to the long-distance transportation.

This study aims to explore the possibility of suppressing the angular vibration by using a dynamic vibration absorber.

According to the big pitch angular vibration of the mirror system at 14.6 Hz, a dynamic vibration absorber was designed with variable stiffness aiming at suppressing the vibration of mirror system for SHINE.

By tuning the nature frequency of the dynamic vibration absorber designed in this study at 14.6 Hz, results show that the vibration of reflecting mirrors at 14.6 Hz is reduced from 154 nard to 27.9 nrad, while vibrations at other frequencies are not disturbed, the total vibration is improved from 193.2 nrad to 76.9 nrad.

This indicated that the certain angular vibration of the mirror system could be suppressed by dynamic vibration absorber, which provided a new solution for angular vibration control of the advanced X ray light sources.