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TY - CONF AU - Zhang, P. AU - Dai, J. AU - Hao, H.X. AU - Huang, T.M. AU - Li, Z.Q. AU - Lin, H.Y. AU - Ma, Q. AU - Meng, F. AU - Mi, Z.H. AU - Pan, W.M. AU - Sun, Y. AU - Wang, G.W. AU - Wang, Q.Y. AU - Zhang, X.Y. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - The 166.6 MHz Proof-of-principle SRF Cavity for HEPS-TF J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - The 166.6 MHz superconducting RF cavities have been proposed for the High Energy Photon Source (HEPS), a 6 GeV kilometer-scale light source. The cavity is of quarter-wave type made of bulk niobium with β =1. Each cavity will be operated at 4 K providing 1.2 MV accelerating voltage and 145 kW of power to the electron beam. During the HEPS - Test Facility (HEPS-TF) phase, a proof-of-principle cavity of 166.6 MHz has been designed in IHEP and manufactured in Beijing. The subsequent BCP was conducted in Ningxia, while HPR, cleanroom assembly and 120 degree baking was done in IHEP. The cavity was finally vertical tested at both 4K and 2K in IHEP. The cavity Q0 at nominal gradient at 4 K was measured to be 2.4·10⁹ with Epeak of 42 MV/m and Bpeak of 65 mT. The maximum Epeak and Bpeak reached 86MV/m and 131 mT respectively at both 4 K and 2 K, and the corresponding Q0 was measured to be 5.10⁸ (4 K) and 3.3·10⁹ (2 K). The residual surface resistance was measured to be 2.3 nOhm. PB - JACoW CP - Geneva, Switzerland SP - 454 EP - 458 KW - cavity KW - ion KW - HOM KW - storage-ring KW - SRF DA - 2018/01 PY - 2018 SN - 978-3-95450-191-5 DO - 10.18429/JACoW-SRF2017-TUPB034 UR - http://jacow.org/srf2017/papers/tupb034.pdf ER -