NSFC, Beijing
PKU/IHIP, Beijing
Considerable progress has been made in China with TESLA technology since SRF 2007. As a mid-term goal, Peking University is striving for constructing an ERL test facility to provide coherent radiation. A cryomodule of an upgraded DC-SRF injector with a 3.5 cell cavity of large grain niobium was designed and constructed for this purpose. The field gradient of the injector cavity in the vertical test at J-Lab is reported as 23.5MV/m. A cryomodule consisting of a China made 9-cell TESLA type cavity is also presented. As the helium liquefier system produced by the Linde Company is being commissioned, it is expected that the PKU test facility will be able to provide 15-20 MeV high quality e-beam at an operating temperature of 2K early next year. Apart from PKU, IHEP started a program to build a short cryomodule consisting of a 1.3GHz 9-cell cavity and related components to serve as a horizontal test stand under the frame of ILC collaboration. The R&D of a 500MHz single-cell Nb cavity module as a spare SRF component of the colliding ring is also in progress. In order to manipulate the beam bunch length on the SSRF ring, 1.5 GHz single cell SRF cavities are being developed at SAIP.
