Performance of the Vibration Damping Pads in the APS Storage Ring

Beam stability goals for the APS storage ring require that its quadrupoles’ vibrations be limited to 110 nm (rms, 4-50 Hz). Viscoelastic damping pads were installed under the girders in order to bring down the vibration levels to within the specified range. This paper presents the design of the damping pads and the results of recent vibration tests to evaluate their performance.