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Modulational instability in large-amplitude linear laser wakefields.

A von Boetticher1,2, R Walczak1,3, S M Hooker1

  • 1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.

Physical Review. E
|March 18, 2023
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Summary
This summary is machine-generated.

We studied ion density perturbations in laser wakefields using simulations. A strong-field instability was observed, with potential impacts on laser wakefield accelerators and multipulse schemes.

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Area of Science:

  • Plasma physics
  • Laser-plasma interactions
  • Particle-in-cell simulations

Background:

  • Laser wakefield acceleration relies on plasma waves to accelerate particles.
  • Understanding instabilities in these waves is crucial for accelerator performance.
  • Large-amplitude wakefields can exhibit complex dynamics, including instabilities.

Purpose of the Study:

  • To investigate the growth of ion density perturbations in large-amplitude linear laser wakefields.
  • To analyze the characteristics and dependencies of these perturbations.
  • To assess the implications for wakefield accelerator technology.

Main Methods:

  • Two-dimensional particle-in-cell simulations were employed.
  • Analysis focused on growth rates and wave numbers of ion density perturbations.
  • The transverse dependence of the instability was examined for a Gaussian wakefield envelope.

Main Results:

  • Observed growth rates and wave numbers align with a longitudinal strong-field modulational instability.
  • Instability growth rates and wave numbers can be maximized off-axis.
  • On-axis growth rates decrease with increased ion mass or electron temperature.

Conclusions:

  • The findings are consistent with a Langmuir wave dispersion relation under high energy density conditions.
  • The identified instability has significant implications for the design and operation of laser wakefield accelerators.
  • Particular relevance is noted for multipulse schemes in wakefield acceleration.