New ceramic chambers for the HLS storage ring

The new injection bump system of Hefei light source (HLS) storage ring is firstly introduced. The new system set a strict error limit to the rise time delay of the pulsed magnetic field, which is caused by the coating of the ceramic chamber. The error allowance is studied and the results are summarized. A new method of coating ceramic chambers was developed. The method, which employs Mo metallization techniques, is quite different from existing methods. Important issues of coating these chambers are presented. A unique, two-coil pulsed magnetic field measurement system was set up. Rise time delay of the pulsed field at different positions inside the ceramic chambers was measured. The rise time deviations inside a pair of chambers proved to be within the range of ±4 ns. A vacuum pressure of 2×10^-8 Pa of the ceramic chambers was obtained after the installation in the storage ring. The chambers performed well. An average injection rate of 2-6 mA/s was obtained.