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Superconducting cavities with low RF frequencies and heavy damping of higherorder modes (HOM) are desired for the main accelerator of High Energy PhotonSource (HEPS), a 6 GeV synchrotron light source promising ultralow emittancecurrently under construction in Beijing. A compact 166.6 MHz superconductingcavity was proposed adopting a quarter-wave beta=1 geometry. Based on thesuccessful development of a proof-of-principle cavity, a HOM-damped 166.6 MHzcompact superconducting cavity was subsequently designed. A ferrite damper wasinstalled on the beam pipe to reduce HOM impedance below the stringentthreshold of coupled-bunch instabilities. Being compact, RF field heating onthe cavity vacuum seal was carefully examined against quenching the NbTiflange. The cavity was later dressed with a helium vessel and the tuningmechanism was also realized. Excellent RF and mechanical properties wereeventually achieved. Finally, the two-cavity string was designed to ensuresmooth transitions among components and proper shielding of synchrotron light.This paper presents a complete design of a fully dressed HOM-dampedlow-frequency beta=1 superconducting cavity for HEPS.

Design of a HOM-Damped 166.6 MHz Compact Quarter-Wave beta=1 Superconducting Cavity for High Energy Photon Source