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TY - CONF AU - Brooks, S.J. AU - Berg, J.S. AU - Hao, Y. AU - Litvinenko, V. AU - Liu, C. AU - Minty, M.G. AU - Méot, F. AU - Ptitsyn, V. AU - Roser, T. AU - Thieberger, P. AU - Trbojevic, D. AU - Tsoupas, N. ED - Belomestnykh, Sergey ED - Hoffman, Caitlin M. ED - Schaa, Volker RW TI - eRHIC: An Efficient Multi-Pass ERL Based on FFAG Return Arcs J2 - Proc. of ERL2015, Stony Brook, NY, USA, June 7-12, 2015 C1 - Stony Brook, NY, USA T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 56 LA - english AB - The proposed eRHIC electron-hadron collider uses a "non-scaling FFAG" lattice to recirculate 16 turns of different energy through just two beamlines located in the RHIC tunnel. This paper presents lattices for these two FFAGs that are optimised for low magnet field and to minimise total synchrotron radiation across the energy range. The higher number of recirculations in the FFAG allows a shorter linac (1.322GeV) to be used, drastically reducing cost, while still achieving a 21.2GeV maximum energy to collide with one of the existing RHIC hadron rings at up to 250GeV. eRHIC uses many cost-saving measures in addition to the FFAG: the linac operates in energy recovery mode, so the beams also decelerate via the same FFAG loops and energy is recovered from the interacted beam. All magnets will constructed from NdFeB permanent magnet material, meaning chillers and large magnet power supplies are not needed. This paper also describes a smaller prototype ERL-FFAG accelerator that will test all of these technologies in combination to reduce technical risk for eRHIC. PB - JACoW CP - Geneva, Switzerland SP - 15 EP - 14 DA - 2015/09 PY - 2015 SN - 978-3-95450-183-0 DO - 10.18429/JACoW-ERL2015-TUIBLH2024 UR - http://jacow.org/ERL2015/papers/tuiblh2024.pdf ER -