DOE OSTI · 3377258
Status of 22 GeV CEBAF Upgrade Using FFA Arcs
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Abstract
Jefferson Lab is exploring an upgrade to extend CEBAF’s energy to ~22 GeV within the existing tunnel by incorporating Fixed-Field Alternating-Gradient (FFA) arcs. In this scheme, the two lowest-energy electromagnetic arcs are removed, the remaining arcs are reassigned to lower energies, and a new pair of high-energy FFA arcs enables six additional recirculations using the existing SRF linacs. The non-scaling FFA lattice employs Halbach-derived permanent magnets with provisions for dipole, quadrupole, and higher-order components, offering large momentum acceptance and reduced operating cost. Implementing this concept requires updated linac optics, modifications to the remaining arcs, and a redesigned electromagnetic switchyard. Ongoing beam-dynamics studies address synchrotron-radiation–induced energy loss and emittance growth, along with strategies for their mitigation.
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Ogur, S. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Bogacz, A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Seryi, A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Gamage, B. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Khan, D. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Nissen, E. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Deitrick, K. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Kazimi, R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Ruber, R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Bodenstein, R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Satogata, T. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Roblin, Y. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Trbojevic, D. [Brookhaven National Laboratory (BNL), Upton, NY (United States)], Berg, J. [Brookhaven National Laboratory (BNL), Upton, NY (United States)], Brooks, S. [Brookhaven National Laboratory (BNL), Upton, NY (United States)], Hoffstaetter, G. [Cornell Univ., Ithaca, NY (United States)], Sereno, N. [Alikhanyan National Lab. (AANL), Yerevan (Armenia)], Morozov, V. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)]. 2026-05-22. Status of 22 GeV CEBAF Upgrade Using FFA Arcs. https://doi.org/10.18429/jacow-ipac2026-thp3304
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