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Self-guided laser wakefield acceleration beyond 1 GeV using ionization-induced injection.

C E Clayton1, J E Ralph, F Albert

  • 1Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA. cclayton@ucla.edu

Physical Review Letters
|September 28, 2010
PubMed
Summary

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Researchers achieved 1.45 GeV electron acceleration in a laser wakefield accelerator by combining self-guided laser propagation and ionization injection. Adding CO2 gas initiated electron injection, leading to high-energy electron beams.

Area of Science:

  • Plasma Physics
  • Particle Acceleration
  • Laser-Plasma Interactions

Background:

  • Laser wakefield acceleration (LWFA) is a promising technique for generating high-energy electron beams.
  • Achieving controlled injection and acceleration over extended lengths remains a challenge.

Purpose of the Study:

  • To demonstrate GeV-scale electron acceleration using matched-beam, self-guided laser propagation.
  • To investigate the role of ionization-induced injection in LWFA.
  • To optimize electron beam properties through controlled gas mixtures.

Main Methods:

  • Combining matched-beam propagation with ionization-induced injection in a laser wakefield accelerator.
  • Utilizing a 60 fs, 110 TW laser pulse propagating through a 1.3 cm gas cell.

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  • Employing computer simulations to confirm the injection mechanism.

    • Main Results:

    • Electrons were accelerated to 1.45 GeV.
    • Self-guided laser propagation and wake excitation were sustained over the full 1.3 cm cell length at plasma densities below 1.5 × 10^18 cm^-3.
    • High-energy electrons were observed only when 3% CO2 was added to He gas.
    • Simulations confirmed K-shell oxygen electrons as the source of injection and acceleration.

    Conclusions:

    • Matched-beam propagation and ionization injection are effective for GeV electron acceleration in LWFA.
    • Controlled injection via K-shell ionization of trace gases is crucial for high-energy electron beam generation.
    • LWFA can achieve efficient electron acceleration over centimeter-scale plasma lengths.