Vibrational stability improvement of a mirror system using active mass damping

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Beamline instruments require high stability for precise measurements.
• Structural vibrations can negatively impact mirror alignment and experimental accuracy.
• Existing mechanisms may not sufficiently address high-frequency vibrations.

Purpose of the Study:

• To develop a high-stability mirror regulating mechanism for the Shanghai Synchrotron Radiation Facility (SSRF).
• To reduce pitch angle vibrations in mirrors caused by structural vibrations.
• To improve the overall performance and stability of beamline instruments.

Main Methods:

• Development of a novel mirror regulating mechanism incorporating active mass damping.
• Implementation of an internal absolute velocity feedback control system.
• Experimental validation using a prototype structure under simulated conditions.

Main Results:

• Effective attenuation of pitch angle vibrations from 47 nanoradians to 27 nanoradians above 1 Hz.
• Demonstrated reduction in root-mean-square (RMS) vibration values.
• Successful mitigation of spillover effects through velocity feedback.

Conclusions:

• The developed mirror regulating mechanism significantly enhances beamline instrument stability at SSRF.
• Active mass damping and velocity feedback are effective strategies for vibration control.
• The prototype's performance validates the design for practical application in synchrotron radiation facilities.