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TY - CONF AU - Zhou, Q. AU - He, F.S. AU - Pan, W.M. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Development of Superconducting RF Double Spoke Cavity at IHEP 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 - The China Spallation Neutron Source (CSNS) is de-signed to produce spallation neutrons. CSNS upgrade is planned to increase beam power by inserting a SRF linac after drift tube linac (DTL). IHEP is developing a 325MHz double spoke cavity at ¿0 of 0.5 for the CSNS SRF linac. The cavity shape was optimized to minimize Ep/Ea while keeping Bp/Ep reasonably low. Meanwhile, mechanical design was applied to check stress, Lorentz force detuning and microphonic effects, and to minimize pressure sensitivity. A new RF coupling scheme was pro-posed to avoid electrons hitting directly on ceramic win-dow. After fabrication and post processing of cavity, the cavity reached Bp of 120mT at E_{acc} = 13.8MV/m and Q₀ = 1.72·10¹⁰ under vertical test at 2K. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1114 EP - 1119 KW - cavity KW - coupling KW - SRF KW - niobium KW - linac DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-THP089 UR - http://jacow.org/srf2019/papers/thp089.pdf ER -