RF SYSTEM OF THE SPRING-8 STORAGE-RING

Construction of three RF stations in the storage ring of SPring-8 has been completed. The design concept concentrates on avoiding a coupled- bunch instability which limits the stored current or makes the synchro tron radiation beam unstable. The cavity is bell-shaped to reduce the coupling impedance of the higher-order modes. The cavity dimensions ar e trimmed systematically to distribute the higher-order mode frequenci es. Each cavity has two movable tuners. The temperature of the cavity cooling water is controlled within 0.02 K and the water flow is kept c onstant. The construction and commissioning of the SPring-8 storage ri ng RF system is reported.