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Energy Bunching from Subcycle Ionization Injection in Laser Wakefield Acceleration.

A Angella1, E Löfquist1, C Gustafsson1

  • 1Lund University, Department of Physics, P.O. Box 118, SE-22100 Lund, Sweden.

Physical Review Letters
|March 1, 2026
PubMed
Summary
This summary is machine-generated.

Researchers observed carrier-envelope phase-driven energy bunching in laser wakefield acceleration. This breakthrough enables subfemtosecond control over electron beams synchronized to laser waveforms.

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Area of Science:

  • Plasma Physics
  • Laser-Particle Acceleration

Background:

  • Laser wakefield acceleration (LWFA) is a promising technique for generating high-energy electron beams.
  • Precise control over electron beam properties, such as energy and bunching, is crucial for advanced applications.
  • The carrier-envelope phase (CEP) of intense laser pulses influences plasma dynamics but has been challenging to control in LWFA.

Purpose of the Study:

  • To experimentally demonstrate carrier-envelope phase-driven energy bunching in LWFA.
  • To investigate the mechanism of electron trapping and beam structuring synchronized to the laser field.
  • To explore the potential for attosecond control in plasma acceleration.

Main Methods:

  • Utilized a few-cycle (∼9 fs), multiterawatt laser pulse.
  • Employed ionization injection in a helium-nitrogen gas mixture.
  • Analyzed electron spectra for quasimonoenergetic peaks and energy spacing.

Main Results:

  • Observed electron spectra with multiple quasimonoenergetic peaks.
  • Demonstrated regular, narrow energy spacing between these peaks.
  • Attributed the observed comb structure to intermittent trapping influenced by the evolving CEP.

Conclusions:

  • Established the first experimental observation of CEP-driven energy bunching in LWFA.
  • Showcased subcycle ionization injection as a method for attosecond control.
  • Enabled synchronized trapping and beam structuring on subfemtosecond timescales.