e-beam stability enhancement by use of damping links for magnet girder assemblies at the ESRF

In order to attenuate the resonant vibrations of the magnet girder assemblies and thus improve the electron beam stability as well as the X-ray beam stability, damping links have been implemented in the ESRF storage ring. Test results show that vibrations of quadrupole magnets have been reduced by a factor of 5.8. Permanent measurements of electron beam motion, as well as quadrupole magnets and floor vibrations have been carried out simultaneously during the operation of the machine before and after the complete installation of the damping links. Results show a clear vibration attenuation of the quadrupole magnets and significant improvement of the electron beam stability. Influences of the booster and front-end shutter on the electron beam stability were also studied.