Study and design of cryogenic accelerating structure and RF optimization of single cell for SXFEL energy upgrading

Purpose Recent researches of RF gun operated at cryogenic temperature have many advantages to serve as the technology to realize the future light source. In order to further improve the accelerating gradient of accelerators, the cryogenic acceleration structure is studied.
Design/methodology/approach The cryogenic accelerating structure is studied by numerical analysis and simulation.
Findings In this paper, the low-temperature characteristics of the material are analyzed firstly, and then the preliminary design scheme of the cavity is proposed according to the analysis results. Furthermore, the prototype with RF coupler is designed and optimized systemically, and the modified Poynting vector distribution is calculated. Finally, the high-power test based on existed setup is also proposed.
Originality/value The study of the cryogenic structure in this paper is helpful for improving the accelerating gradient and developing compact accelerators.