Study on design of proton linacs

Two important directions in the development of proton linacs are high current proton linacs (mainly applied in nuclear power field) and compact proton linacs (for proton therapy). There are some common characteristics in them: 1. Employment of the novel accelerating structures, which are combination and evolution of the conventional ones; 2. Accelerating beam with small emittance; 3. Requirement for high reliability. The construction of the former is, however, much more difficult because it needs low beam lose rate and as high power transformation efficiency as possible. In this paper some important problems in the design of these accelerators are discussed and some schemes designed by us are presented.