Author: Berg, J.S.
Paper Title Page
MOPBTH005
 A FFAG-ERL at Cornell, a BNL/Cornell Collaboration  
 
  • G.H. Hoffstaetter, I.V. Bazarov, J. Dobbins, B.M. Dunham, C.E. Mayes, J.R. Patterson, D. Sagan
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • I. Ben-Zvi, J.S. Berg, M. Blaskiewicz, S.J. Brooks, K.A. Brown, W. Fischer, Y. Hao, W. Meng, F. Méot, M.G. Minty, S. Peggs, V. Ptitsyn, T. Roser, P. Thieberger, D. Trbojevic, N. Tsoupas
    BNL, Upton, Long Island, New York, USA
  
  Cornell University has prototyped technology essential for any high-brightness electron ERL. This includes a DC gun and an SRF injector Linac, a high-current CW cryomodule, a high-power beam stop, and several diagnostics tools for high-current and high-brightness beams. All these are now available to equip a one-cryomodule ERL, and laboratory space has been cleared out and is radiation shielded to install this ERL at Cornell. BNL has designed a multi-turn ERL for eRHIC where beam is transported 22 times around the RHIC tunnel. The number of transport lines is minimized by using two non-scaling FFAG arcs. A collaboration between BNL and Cornell has been formed to investigate the new NS-FFAG optics of this design, built with permanent magnets, and to commission the unprecedented multi-turn ERL operation. This collaboration plans to install a NS-FFAG return loop and the associated optics-matching sections at Cornell’s one-cryomodule ERL. This FFAG-ERL will be installed in several stages, each of which investigates crutial parts of this new design.  
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TUIBLH2024
 eRHIC: An Efficient Multi-Pass ERL Based on FFAG Return Arcs  
 
  • S.J. Brooks, J.S. Berg, Y. Hao, V. Litvinenko, C. Liu, F. Méot, M.G. Minty, V. Ptitsyn, T. Roser, P. Thieberger, D. Trbojevic, N. Tsoupas
    BNL, Upton, Long Island, New York, USA
  
  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.  
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