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TY - UNPB AU - Hoffstaetter, G.H. AU - Banerjee, N. AU - Barley, J. AU - Bartnik, A.C. AU - Bazarov, I.V. AU - Berg, J.S. AU - Brooks, S.J. AU - Burke, D.C. AU - Crittenden, J.A. AU - Cultrera, L. AU - Dobbins, J. AU - Furuta, F. AU - Gallagher, R.E. AU - Ge, M. AU - Gulliford, C.M. AU - Heltsley, B.K. AU - Jusic, D. AU - Kaplan, R.P.K. AU - Kostroun, V.O. AU - Li, Y. AU - Liepe, M. AU - Liu, C. AU - Lou, W. AU - Mahler, G.J. AU - Michnoff, R.J. AU - Minty, M.G. AU - Méot, F. AU - Patterson, J.R. AU - Peggs, S. AU - Ptitsyn, V. AU - Quigley, P. AU - Roser, T. AU - Sabol, D.M. AU - Sagan, D. AU - Sears, J. AU - Shore, C.H. AU - Smith, E.N. AU - Smolenski, K.W. AU - Thieberger, P. AU - Trbojevic, D. AU - Tsoupas, N. AU - Tuozzolo, J.E. AU - Veshcherevich, V. AU - Widger, D. AU - Willeke, F.J. AU - Witte, H. ED - Schaa, Volker RW ED - Pei, Guoxi ED - Chin, Yong Ho ED - Fu, Shinian ED - Zhao, Ning TI - CBETA, a 4-turn ERL Based on SRF Linacs and Permanent Magnet Beam Transport J2 - Proc. of LINAC2018, Beijing, China, 16-21 September 2018 CY - Beijing, China T2 - Linear Accelerator Conference T3 - 29 LA - english AB - A collaboration between Cornell University and Brookhaven National Laboratory has designed a novel accelerator and is constructing it at Cornell: CBETA, the Cornell-BNL ERL Test Accelerator. The ERL technology that has been prototyped at Cornell for many years is being used, including a DC electron source and an SRF injector Linac with world-record current and normalized brightness in a bunch train, a high-current linac cryomodule optimized for ERLs, a high-power beam stop, and several diagnostics tools for high-current and high-brightness beams. BNL has designed a multi-turn ERL and a recirculating linac for eRHIC; in both designs the beam is transported many times around the 4 km long RHIC tunnel. The number of transport lines is minimized by using two arcs with Fixed Field Alternating Gradient design. This technique will be tested in CBETA, which has a single return for the 4-beam energies with strongly-focusing permanent magnets of Halbach type. The high-brightness beam with 150 MeV and up to 40 mA will have applications for Electron Ion Colliders (EICs), e.g. for their electron cooling, and for applications in industry, in nuclear physics, and in X-ray science. PB - JACoW Publishing CP - Geneva, Switzerland ER -