THP3304

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URL	https://doi.org/10.18429/JACoW-IPAC2026-THP3304
Title	Status of 22 GeV CEBAF Upgrade Using FFA Arcs
Authors	S. Ogur, A. Bogacz, A. Seryi, B. Gamage, D. Khan, E. Nissen, K. Deitrick, R. Kazimi, R. Ruber, R. Bodenstein, T. Satogata, Y. Roblin Thomas Jefferson National Accelerator Facility D. Trbojevic, J. Berg, S. Brooks Brookhaven National Laboratory G. Hoffstaetter Cornell University N. Sereno Argonne National Laboratory V. Morozov Oak Ridge National Laboratory
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—one on each side of the racetrack— are removed, the remaining arcs are reassigned accordingly, 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.
Paper	download: THP3304.pdf
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Conference	17th International Particle Accelerator Conference
Series
Location	Deauville, France
Date	17-22 May 2026
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Editorial Board
Online ISBN	978-3-95450-252-3
Online ISSN	2673-5350
Received	11 May 2026
Revised	21 May 2026
Accepted
Issued	20 July 2026
DOI	10.18429/JACoW-IPAC2026-THP3304
Pages	4205-4208
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.