• Q. Qin, L.M. Chen, Y. Jiao, D. Wang, J.Q. Wang, X.H. Wang, Y. Wei, X.M. Wen, J. Xing, G. Xu, C.H. Yu, C. Zhang, Y. Zhang
  IHEP Beijing, Beijing

Funding: Work supported by National Natural Science Foundation of China contract 10725525

The upgraded project of the Beijing Electron-Positron Collider (BEPCII) can be operated not only for high energy physics experiments as a charm factory, but for synchrotron radiation users as a first generation light source. The design of the synchrotron radiation (SR) mode of the BEPCII storage ring keeps all the original beam lines of the BEPC. The lattice based on the layout of the collider can meet all the requirements of the SR users, and the emittance is minimized. Optimization of the SR mode focuses on reducing the effects from wigglers around the ring. Some results from the operations of the SR mode are also given.

• N. Wang, Y.D. Liu, Q. Qin
  IHEP Beijing, Beijing

The electron proton (e-p) instability has been observed in many proton accelerators. It will induce transverse beam size blow up, cause beam loss and restrict the machine performance. A simulation code is developed to study the electron proton instability in the China Spallation Neutron Source (CSNS) ring. The results of numerical simulation of the electron cloud formation and the electron proton instability are presented.

• S. Fu, H. Chen, Y.W. Chen, Y.L. Chi, C.D. Deng, H. Dong, L. Dong, S.X. Fang, W. He, K.X. Huang, W. Kang, X.C. Kong, J. Li, H.F. Ouyang, Q. Qin, H. Qu, C. Shi, H. Sun, J. Tang, S. Wang, J. Wei, T. Wei, T.G. Xu, Z.X. Xu, X. Yin, J. Zhang, Z.H. Zhang
  IHEP Beijing, Beijing

CSNS accelerator mainly consists of an H^- linac and a proton rapid cycling synchrotron. It is designed to accelerate proton beam pulses to 1.6 GeV kinetic energy at 25 Hz repetition rate, striking a solid metal target to produce spallation neutrons. The accelerator is designed to deliver a beam power of 120 kW with the upgrade capability up to 500 kW, The CSNS accelerator is the first large-scale, high-power accelerator project to be constructed in China and thus we are facing a lot of challenges in some key technologies. A series of R&D for major prototypes have being conducted since 2006, including an H^- ion source, DTL tank, RF power supply for the linac, injection/extraction magnets and its pulse power supplies, dipole and quadrupole prototype magnets in the ring and its power supplies, ferrite-loaded RF prototype cavity, ceramic vacuum chamber, control and some beam diagnostics. This paper will briefly introduce the design and R&D status of the CSNS accelerator.

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