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Stable double-bunch beam generation for plasma wakefield accelerators via coherent synchrotron radiation-tolerant isochronous beamlines

Wei Li, Zhongtian Liu, Zhu Ming, Haijing Wang, Cai Meng*, and Yi Jiao

  • *Contact author: mengc@ihep.ac.cn
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Phys. Rev. Accel. Beams 29, 084901 – Published 6 August, 2026

DOI: https://doi.org/10.1103/whjk-lq23

Abstract

Beam-driven plasma wakefield acceleration represents a promising strategy for producing high-energy electron and positron beams in future accelerator facilities. A key challenge in realizing high-quality acceleration is the production of high-charge, high-stability double-bunch beams, as existing methods are often limited to low charges or suffer from significant charge loss. In this paper, we propose a coherent synchrotron radiation-tolerant beam-merging scheme using twin isochronous beamlines that share a common dipole magnet to generate a high-charge double-bunch beam with excellent stability. Numerical simulations indicate that the proposed scheme generates a 5 nC/1 nC electron double-bunch beam that exhibits no charge loss, with emittance growths of both bunches constrained to approximately 0.1  mm mrad, and an interbunch timing jitter maintained below ±2  fs. The robustness of the scheme is evaluated, and its potential use in large-scale accelerator facilities is emphasized for supplying high-quality drive beams for plasma wakefield accelerators.

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Phys. Rev. Accel. Beams 29, 084901– Published 6 August, 2026
  • Received 5 November 2025
  • Revised 10 June 2026
  • Accepted 29 June 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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