Dynamic Test of SSRF Storage Ring Girder-Magnet Assembly

Storage ring magnets support stability is essential to beam stability. In SSRF, a high stiff girder and unique ball-bearing plus wedge block adjuster were designed. A girder-magnet assembly prototype was assembled, and extensive tests were carried out on the girder-magnet assembly. The results show that its lowest eigenfrequency is 19.5Hz under three points support and 23.5Hz under four points support. And the amplification in lateral is much higher than vertical. Anti-vibration concrete was used in dipole support and girder pedestal. It is tested to be useful in attenuating the amplification. Damping structures were designed for the assembly and tests are in progress. 1