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Objective <p>Energy recovery linacs (ERLs) are pivotal for generating high-brightness electron beams with high average power and superior energy efficiency. This paper presents the beam dynamics design and optimization of an ERL test platform based on the upgraded Chinese Academy of Engineering Physics Infrared Terahertz Free-Electron Laser(CAEP IR-THz FEL) facility. The study focuses specifically on its ERL mode, with the primary objective of achieving the design parameter goals through comprehensive beam dynamics simulations.</p> Methods <p>By employing start-to-end simulations and multi-objective optimization, key subsystems—including an integrated injector-merger and the recirculation loop—are designed to preserve beam quality by suppressing emittance growth, controlling transverse beam size, and mitigating beam loss.</p> Results and Conclusion <p>The results demonstrate that the lattice can deliver a high-quality beam suitable for efficient energy recovery, thereby establishing a foundational framework for the engineering deployment of the ERL mode.</p>

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Beam dynamics study of an energy recovery linac test platform based on the CAEP Infrared Terahertz Free-Electron Laser facility

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Xin Yang,
  • Hanxun Xu,
  • Xiaoxiao Yuan,
  • Zimin Zhang,
  • Ping Yuan,
  • Quantang Zhao,
  • Kui Zhou

摘要

Objective

Energy recovery linacs (ERLs) are pivotal for generating high-brightness electron beams with high average power and superior energy efficiency. This paper presents the beam dynamics design and optimization of an ERL test platform based on the upgraded Chinese Academy of Engineering Physics Infrared Terahertz Free-Electron Laser(CAEP IR-THz FEL) facility. The study focuses specifically on its ERL mode, with the primary objective of achieving the design parameter goals through comprehensive beam dynamics simulations.

Methods

By employing start-to-end simulations and multi-objective optimization, key subsystems—including an integrated injector-merger and the recirculation loop—are designed to preserve beam quality by suppressing emittance growth, controlling transverse beam size, and mitigating beam loss.

Results and Conclusion

The results demonstrate that the lattice can deliver a high-quality beam suitable for efficient energy recovery, thereby establishing a foundational framework for the engineering deployment of the ERL mode.