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TY - CONF AU - Lou, W. AU - Bartnik, A.C. AU - Berg, J.S. AU - Brooks, S.J. AU - Crittenden, J.A. AU - Gulliford, C.M. AU - Hoffstaetter, G.H. AU - Mayes, C.E. AU - Méot, F. AU - Sagan, D. AU - Trbojevic, D. AU - Tsoupas, N. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - The Beam Optics of the FFAG Cell of the CBETA ERL Accelerator J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The Cornell-Brookhaven Energy Recovery Linac Test Accelerator now under construction will accelerate electrons from 6 MeV to 150 MeV in four linac passes, using a single return line accepting all energies from 42 to 150 MeV. We describe the optical design of the machine, with emphasis on recent updates. We explain how we choose parameters for the wide energy acceptance return arc, taking into account 3D field maps generated from magnet designs. We give the final machine parameters resulting from iterations between desired lattice properties and magnet design. We modified the optics to improve the periodicity of the return arc near its ends and to create adequate space for vacuum hardware. The return arc is connected to the linac with splitter lines that serve to match the optics for each beam energy. We describe how matching conditions were chosen for the splitter lines and how we use them to control longitudinal motion. We simulate the injection and low energy extraction systems including space charge effects, matching the beam properties to the optical parameters of the rest of the machine. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3000 EP - 3003 KW - optics KW - quadrupole KW - focusing KW - linac KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPAF023 UR - http://jacow.org/ipac2018/papers/thpaf023.pdf ER -