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TY - UNPB AU - Hoffstaetter, G.H. ED - Ramberger, Suitbert ED - Draper, Mick ED - Schaa, Volker RW TI - CBETA, a 4-Turn ERL With FFAG Arc J2 - Proc. of ERL2017, Geneva, Switzerland, June 18-23, 2017 C1 - Geneva, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop T3 - 59 LA - english AB - Cornell University has been pioneering Energy Recovery Linacs (ERLs) technology that is essential for any high brightness electron ERL. This includes 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, and a high-power beam stop, and several diagnostics tools for high-current and high-brightness beams. All these are now being used to construct a novel one-cryomodule ERL in Cornell's Wilson Lab. BNL has designed a multi-turn ERL for eRHIC, where beam is transported more than 20 times around the 4km long RHIC tunnel. The number of transport lines is minimized by using two arcs with strongly-focusing permanent magnets that can control many beams of different energies. A collaboration between BNL and Cornell has been formed to investigate this multi-turn eRHIC ERL design by building a 4-turn, one-cryomodule ERL at Cornell. It also has a return loop built with strongly focusing permanent magnets and is meant to accelerate 40 mA beam to 150 MeV. This high-brightness beam will have applications beyond accelerator research, in industry, in nuclear physics, and in X-ray science. PB - JACoW Publishing CP - Geneva, Switzerland ER -