CHINA SPALLATION NEUTRON SOURCE ACCELERATORS: DESIGN, RESEARCH, AND DEVELOPMENT∗

The China Spallation Neutron Source (CSNS) is a newly approved high-power accelerator project based on a H − lin-ear accelerator and a rapid cycling synchrotron. During the past year, several major revisions were made on the design including the type of the front end, the linac frequency, the transport layout, the ring lattice, and the type of ring com-ponents. Here, we discuss the rationale of design revisions, status of the R&D efforts, and upgrade considerations