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TY - CPAPER AU - Conway, Z.A. AU - Barcikowski, A. AU - Cherry, G.L. AU - Fischer, R.L. AU - Gerbick, S.M. AU - Hopper, C.S. AU - Kedzie, M. AU - Kelly, M.P. AU - Kim, S.H. AU - MacDonald, S.W.T. AU - Mustapha, B. AU - Ostroumov, P.N. AU - Reid, T. TI - Achieving High Peak Fields and Low Residual Resistance in Half-Wave Cavities J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - We have designed, fabricated and tested two new half-wave resonators following the successful development of a series of niobium superconducting quarter-wave cavities. The half-wave resonators are optimized for β = 0.11 ions, operate at 162.5 MHz and are intended to provide up to 2 MV effective voltage for particles with the optimal velocity. Testing of the first two half-wave resonators is complete with both reaching accelerating voltages greater than 3.5 MV with low-field residual resistances of 1.7 and 2.3 nΩ respectively. The intention of this paper is to provide insight into how Argonne achieves low-residual resistances and high surface fields in low-beta cavities by describing the cavity design, fabrication, processing and testing. PB - JACoW CY - Geneva, Switzerland SP - 973 EP - 975 KW - cavity KW - niobium KW - accelerating-gradient KW - cryomodule KW - vacuum DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-WEBA05 UR - http://srf2015.vrws.de/papers/weba05.pdf ER -