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Several large scientific projects based on superconducting RF (SRF) accelerators are in construction preparation phase or have been proposed in China. A 6 GeV synchrotron light source (HEPS) is to be constructed in Beijing from 2018 to 2024, which plans to use four 166 MHz SRF cavities and two 500 MHz SRF cavities. The CIADS project in Guangdong province for nuclear waste treatment is proposed for the next five years, which plans to use multiple low beta cavities to accelerate proton to about 600 MeV. The XFEL light source in Shanghai is approved to complete construction in seven years, which plans to use more than 600 1.3 GHz TESLA cavities to reach 8 GeV beam energy. The 100 km circumference, 240 GeV center-of-mass energy circular electron-positron collider (CEPC) as a Higgs factory is proposed to use 160 1.3 GHz TESLA cavities and 336 650 MHz 2-cell cavities. The Institute of High Energy Physics (IHEP) has been or will be involved in all these large accelerator projects, and more than 400 SRF cavities are expected to be tested in the following years.
To realize these projects, as well as many other future large superconducting accelerator projects in China and worldwide, it is mandatory to build a large-scale and well-functioned production and SRF R&D facility in an early stage; such a facility would also help to train the new generation of scientists, as well as to serve as a link between industry and project management. Recently the Beijing local government funded IHEP to build a large SRF facility (4500 m2) as part of the PAPS (Platform of Advanced Photon Source technology R&D) project. The construction of the PAPS SRF facility has just started, and it is planned to complete before June 2020.
The PAPS SRF facility is aimed at processing and testing of several hundreds of SRF cavities and couplers, and assembly and testing of about 20 cryomodules per year for different users. It is also planned to cover the requirement of new SRF material and technology development. The layout and the function of the PAPS SRF facility need to be carefully defined, designed and reviewed.
Contact: Feisi He (email@example.com), Jiyuan Zhai (firstname.lastname@example.org), Xitong Sun (email@example.com)