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TY - UNPB AU - Hoffstaetter, G.H. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - CBETA, a 4-turn ERL Based on SRF Linacs: Construction and Commissioning J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - A DC-photo-emitter electron source, a high-power SRF injector linac, a high-current SRF linac for energy recovery, and a permanent-magnet return loop have been assembled to the 4-turn SRF ERL. Because of it’s Fixed-Field Alternating-gradient optics, the single return loop accommodates all 4 beam energies in one vacuum pipe. A collaboration between Cornell and Brookhaven National Laboratory has constructed, and is currently commissioning on the Cornell campus this Cornell-BNL-ERL-Test-Accelerator (CBETA). While the electron sourse and SRF linac were prototyped at Cornell, the strong Halbach-type permanent magnets for the FFA return loop were prototyped at BNL, leading to a strong collaboration. The Electron Ion Collider (EIC) has been determined to be the USA’s highest priority new large accelerator for Nuclear Physics by the National Academy of Sciences. It¿s luminosity relies on electron cooling, and only ERLs can provide the cooling parameters. CBETA therefore provides essential R&D for the EIC. The high-brightness beam with 150 MeV and up to 40 mA will have applications beyond EIC cooling and basic accelerator research, in industry, in nuclear physics, and in X-ray science. PB - JACoW Publishing CP - Geneva, Switzerland ER -