FABRICATION AND TEST OF THE 500 MHZ SC MODULES FOR THE BEPCII

Two KEKB type HOM damped SC cavities were constructed during past three years. These SC modules were re-designed to meet the RF frequency of 500 MHz of the BEPCII, the upgrade project of the Beijing Electron and Positron Collider, and have already been operated smoothly. It is a product of the successful collaboration among Mitsubishi Electric Co. (MELCO), KEK and IHEP of China. The cavity modules were fabricated and surface-treated by MELCO with the help and support of KEK. The vertical test of niobium cell, and the high power test of couplers and dampers were carried out in KEK, and the final acceptance tests were done in IHEP.