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TY - UNPB AU - Zhang, P. AU - Dai, J. AU - Ge, R. AU - Han, R. AU - Huang, T.M. AU - Li, S.P. AU - Li, Z.Q. AU - Lin, H.Y. AU - Ma, Q. AU - Mi, Z.H. AU - Wang, Q.Y. AU - Zhang, X.Y. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - The Development of HOM-damped 166.6MHz SRF Cavities for High Energy Photon Source in Beijing J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - High Energy Photon Source is a 6GeV kilometer-scale synchrotron light source to be built in Beijing. The designed beam emittance is lower than 100pm.rad approaching diffraction limitation with 200mA beam current stored. In order to realize a novel injection scheme and prolong the beam lifetime, a double-frequency RF system has been proposed with 166.6MHz as the fundamental and 499.8MHz as the third harmonic. Both RF system will adopt superconducting cavities. Over the last three years, a 166.6MHz quarter-wave β=1 proof-of-principle SRF cavity has been in-house developed, vertical tested, dressed with helium jacket and ancillaries, and eventually horizontal tested with a success in early 2019. In parallel, the HOM-damped prototype cavity has been designed adopting a hybrid damping scheme. Due to a rather low-frequency HOMs, both HOM couplers and beam-pipe HOM absorbers are to be used to ensure a tight impedance budget. PB - JACoW Publishing CP - Geneva, Switzerland ER -