7–12 May 2023
Venice, Italy
Europe/Zurich timezone

CEBAF 22 GeV FFA energy upgrade

MOPL182
8 May 2023, 16:30
2h
Sala Laguna

Sala Laguna

Poster Presentation MC1.A12: FFA Monday Poster Session

Speaker

Kirsten Deitrick (Thomas Jefferson National Accelerator Facility)

Description

Extending the energy reach of CEBAF by increasing the number of recirculations, while using the existing linacs is explored. This energy upgrade is based on the multi-pass acceleration of electrons in a single non-scaling Fixed Field Alternating Gradient (FFA) beam line, using Halbach-style permanent magnets. Encouraged by the recent successful demonstration of CBETA, a proposal was formulated to nearly double the energy of CEBAF from 12 to 22~GeV by replacing the highest energy arcs with FFA transport. The new FFA arcs would support simultaneous transport of an additional 6 passes spanning roughly a factor of two in energy. One of the challenges of the multi-pass (11) linac optics is to assure uniform focusing over a wide range of energies. Here, we propose a triplet lattice that provides a stable periodic solution covering an energy ratio of 1:33. The current CEBAF injection at 123 MeV, makes optical matching in the first linac impossible due to the extremely high energy ratio (1:175). Replacement of the current injector with a 650 MeV recirculating injector will alleviate this issue. Orbital and optical matching from the FFA arcs to the linacs is implemented as a compact non-adiabatic insert. The design presented here is anticipated to deliver a 22 GeV beam with normalized emittance of 76 mm·mrad and a relative energy spread of 1×10^{-3}. Further recirculation beyond 22 GeV is limited by the large (974 MeV per electron) energy loss due to synchrotron radiation.

Footnotes

submitting author: kirstend@jlab.org

Funding Agency

Authored by Jefferson Science Associates, LLC under U.S. DOE Contract DE-AC05-06OR23177, Brookhaven Science Associates, LLC, Contract DE-SC0012704, and UT-Battelle, LLC, contract DE-AC05-00OR22725.

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Co-authors

Jay Benesch (Thomas Jefferson National Accelerator Facility) J. Berg (Brookhaven National Laboratory) Ryan Bodenstein (Thomas Jefferson National Accelerator Facility) Alex Bogacz (Thomas Jefferson National Accelerator Facility) Stephen Brooks (Brookhaven National Laboratory) Alexander Coxe (Jefferson Lab) Kirsten Deitrick (Thomas Jefferson National Accelerator Facility) Bamunuvita Gamage (Thomas Jefferson National Accelerator Facility) Georg Hoffstaetter (Cornell University (CLASSE)) Donish Khan (Thomas Jefferson National Accelerator Facility) Geoffrey Krafft (Thomas Jefferson National Accelerator Facility) Reza Kazimi (Thomas Jefferson National Accelerator Facility) Vasiliy Morozov (Thomas Jefferson National Accelerator Facility) Katheryne Price (Thomas Jefferson National Accelerator Facility) Yves Roblin (Thomas Jefferson National Accelerator Facility) Dr Todd Satogata (Thomas Jefferson National Accelerator Facility) Andrei Seryi (Thomas Jefferson National Accelerator Facility) Dejan Trbojevic (Brookhaven National Laboratory)

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