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TY - CONF AU - Huang, T.M. AU - Bing, F. AU - Guo, R. AU - Lin, H.Y. AU - Ma, Q. AU - Pan, W.M. AU - Zhai, J.Y. AU - Zhang, Z. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - The Fundamental Power Coupler for CEPC Booster Cavity J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - 96 Tesla type 1.3GHz 9-cell superconducting cavities, housed in eight 12m-long cryomodules, will be adopted for CEPC booster. Each cavity equips with one variable coupling, double-window fundamental power coupler (FPC). The FPC will operate at RF power up to 20 kW at quasi-CW mode. A variable coupling from 4·10⁶ to 10⁷ is required to meet different operation modes of Higgs, W and Z. A new coupler that employs a 50 Ω coaxial line with bellow structures, a cylindrical warm window, a coaxial planar cold window and a coupling adjusting actuator has been designed. Then two prototypes have been fabricated and high power tested up to CW 70 kW successfully. In this paper, the design, fabrication and high power test of the prototype FPCs will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 789 EP - 794 KW - vacuum KW - cavity KW - booster KW - simulation KW - multipactoring DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-WETEB8 UR - http://jacow.org/srf2019/papers/weteb8.pdf ER -