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Lattice design and dynamics studies of a low-alpha storage ring with tens of nanometer bunch length

Zhilong Pan1,*, Weishi Wan2, Alexander Chao3, Xiujie Deng3, Yao Zhang4, Wenhui Huang1, and Chuanxiang Tang1,†

  • *Contact author: panzl@mail.tsinghua.edu.cn
  • †Contact author: tang.xuh@mail.tsinghua.edu.cn
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Phys. Rev. Accel. Beams 29, 103401 – Published 1 October, 2026

DOI: https://doi.org/10.1103/nwjr-p5st

Abstract

A novel concept is introduced to reduce the longitudinal emittance in a low momentum compaction factor (low-alpha) storage ring, enabling the stable storage of electron bunches shorter than 100 nm. This design strategy can be applied to any quasi-isochronous storage ring to achieve very high radiation power through the longitudinal coherence of the emitted radiation. This paper addresses the nonlinear dynamics and aperture optimization for this type of storage ring. An optimal design example based on our analysis is presented. Single-particle tracking results demonstrate that an electron beam with an equilibrium root-mean-square bunch length of approximately 80 nm can be maintained in this ring, featuring a dynamic aperture larger than 1 mm. Additionally, preliminary considerations of intrabeam scattering effects in this ring are discussed.

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Phys. Rev. Accel. Beams 29, 103401– Published 1 October, 2026
  • Received 11 June 2026
  • Accepted 11 September 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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