• X. Yin
  GSI, Darmstadt
• S. Fu, J. Peng
  IHEP Beijing, Beijing

In the conventional design of rf linacs, the space-charges are not in three-dimension thermal equilibrium. The space-charge couples the longitudinal and transverse will cause equipartitioning process which causes the emittance growth and the halo formation. In the design of the Chinese Spallation Neutron Source (CSNS) linac], three cases are investigated using the Hofmann stability charts to analysis and optimize the layout. In this paper, we present the equipartitioning beam study of the CSNS Alvarez DTL linac.

• 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.

Slides