1.3GHz Superconducting Accelerating Unit, which is one of the key innovation projects supported by IHEP innovation fund, has recently passed 80K cool down test successfully in August, 2015. 

The tests show that all the sub-systems, such as 1.3GHz 9cell large grain cavity, high power coupler, tuners and LLRF, have reached the designed parameters. During the cooling experiment, 1.3GHz 9cell cavity reached resonant frequency 1300.5MHz with vacuum inside cavity 1.2E-7Pa; high power coupler vacuum 1.2E-06Pa; cryostat vacuum 2.5E-04Pa. The mechanical tuner and electric-piezo tuner behaved normally. 

At the same time, the 2K cryogenic system and 1.3GHz klystron high power system was installed at IHEP. 1.3GHz super-conducting accelerator technology is one of the key technologies for future high energy physics research, which will be applied to the Circular Electron Positron Collider (CEPC), the International Linear Collider (ILC) and other advanced accelerator projects in China and around the world in the future.