CAS, Inst High Energy Phys, Beijing 100039, Peoples R China
Preliminary design of a dedicated proton therapy linac (S-band) is described. The short beam pulse width and high repetition rate make the linac similar to the electron linacs now used for cancer therapy. This linac consists of ion source, RFQ, DTL, SCDTL, and SCL. Its tatol length is 26m. The final energy of the output proton beam is 70-200 MeV, with average beam cut-rent of 10-40nA.