Proposal of superconducting spoke cavity development for electron accelerators

Hajima, Ryoichi; Sawamura, Masaru; Iwashita, Yoshihisa*

We have launched a development program of superconducting spoke cavities for electron beam acceleration. While the spoke cavity was originally invented for proton and ion acceleration for a velocity range of = 0.3-0.5, it can be also applicable to electron acceleration, = 1, with a minor modification. We plan to design and fabricate superconducting spoke cavities for laser Compton scattered photon sources, where the spoke cavities are expected to realize a compact industrial-use X-ray source with a reasonable cost and easy operation. In this paper, we describe features of the spoke cavity and results of cavity shape optimization for electromagnetic and mechanical properties.