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<p>Laser–plasma accelerators are able to sustain electric fields that are orders of magnitude stronger than conventional radio-frequency cavities, offering a path towards ultracompact, high-energy particle accelerators. It is predicted that electron energies exceeding 100 GeV can be achieved using metre-scale accelerators, which would match the highest-energy electrons ever produced at CERN’s Large Electron–Positron Collider. However, electron energy gain remains limited by dephasing, where the electrons eventually outrun the accelerating field driven by a subluminal laser pulse. Flying-focus laser pulses can eliminate dephasing by continuously focusing incoming light along the accelerator axis to drive a plasma wave at the vacuum speed of light. Here we demonstrate that a flying focus can be used to accelerate electrons well beyond the traditional dephasing limit, exceeding it by a factor of two. This establishes a proof of concept for spatiotemporal control of laser-driven wakefields and the generation of tera-electronvolt-class electron beams using near-future multi-petawatt lasers.</p>

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Dephasingless laser wakefield acceleration of electrons using a flying focus

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • C. D. Arrowsmith,
  • K. G. Miller,
  • M. V. Ambat,
  • S.-W. Bahk,
  • I. A. Begishev,
  • J. Bromage,
  • S. Bucht,
  • N. Dauphin,
  • C. Dorrer,
  • C. Jeon,
  • J. Kendrick,
  • I. A. LaBelle,
  • L. S. Mack,
  • A. L. Martin,
  • C. Mileham,
  • S. Qin,
  • J. J. Pigeon,
  • A. Raymond,
  • M. Romanofsky,
  • H. G. Rinderknecht,
  • R. G. Roides,
  • J. Szczepanski,
  • I. A. Settle,
  • M. Spilatro,
  • B. Webb,
  • J. L. Shaw,
  • J. P. Palastro,
  • D. H. Froula

摘要

Laser–plasma accelerators are able to sustain electric fields that are orders of magnitude stronger than conventional radio-frequency cavities, offering a path towards ultracompact, high-energy particle accelerators. It is predicted that electron energies exceeding 100 GeV can be achieved using metre-scale accelerators, which would match the highest-energy electrons ever produced at CERN’s Large Electron–Positron Collider. However, electron energy gain remains limited by dephasing, where the electrons eventually outrun the accelerating field driven by a subluminal laser pulse. Flying-focus laser pulses can eliminate dephasing by continuously focusing incoming light along the accelerator axis to drive a plasma wave at the vacuum speed of light. Here we demonstrate that a flying focus can be used to accelerate electrons well beyond the traditional dephasing limit, exceeding it by a factor of two. This establishes a proof of concept for spatiotemporal control of laser-driven wakefields and the generation of tera-electronvolt-class electron beams using near-future multi-petawatt lasers.