Design of a �� = 0.45, f = 350 MHz spoke cavity

Recently intensive studies have been done on superconducting cavities, e.g. spoke cavity, reentrant cavity, and CH cavity, which are used as accelerating structures in the low and medium energy part of high power high intensity proton or ion accelerators. Many experiments have shown that spoke cavity is a good candidate for low energy part. It is also promising to be used for the medium ?? area. So a ?? = 0.45 spoke cavity is being studied at Peking University. In this paper, the structural and electromagnetic design of a ?? = 0.45, f= 350 MHz spoke cavity is reported in detail. The calculated RF parameters (e.g. Q, r/ Q, peak surface fields and dissipated power) indict a potential of good acceleration.EI0177-802