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Three-dipole kicker injection scheme for the Advanced Light Source upgrade accumulator ring

M. Ehrlichman*, T. Hellert, S. C. Leemann, G. Penn, C. Steier, C. Sun, M. Venturini, and D. Wang

  • Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *mike@lbl.gov
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Phys. Rev. Accel. Beams 24, 120702 – Published 17 December, 2021

DOI: https://doi.org/10.1103/PhysRevAccelBeams.24.120702

Abstract

The Advanced Light Source Upgrade will implement on axis single-train swap-out injection employing an accumulator between the booster and storage rings. The accumulator ring (AR) design is a twelve period triple-bend achromat that will be installed along the inner circumference of the storage-ring tunnel. A nonconventional injection scheme will be utilized for top-off off axis injection from the booster into the AR meant to accommodate a large ∼300  nm emittance beam into a vacuum-chamber with a limiting horizontal aperture radius as small as 8 mm. The scheme incorporates three dipole kickers distributed over three sectors, with two kickers perturbing the stored beam and the third affecting both the stored and the injected beam trajectories. This paper describes this “3DK” injection scheme and how it fits the AR’s particular requirements. We describe the design and optimization process, and how we evaluated its fitness as a solution for booster-to-accumulator ring injection.

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References (16)

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Phys. Rev. Accel. Beams 24, 120702– Published 17 December, 2021
  • Received 16 June 2021
  • Accepted 29 November 2021
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