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Area of Science:

  • Plasma Physics
  • Laser-driven particle acceleration

Background:

  • Laser-plasma acceleration offers a compact alternative to conventional accelerators.
  • Achieving high electron beam charge and energy with low laser energy remains a challenge.

Purpose of the Study:

  • To demonstrate efficient laser-plasma acceleration of high-charge electron beams using low-energy ultrashort laser pulses.
  • To investigate the underlying physical mechanisms enabling this acceleration.

Main Methods:

  • Utilizing ultrashort laser pulses with minimal energy (10 mJ).
  • Employing an extremely dense and thin hydrogen gas jet as the acceleration medium.
  • Characterizing electron beam properties (charge and energy) and associated optical emissions.

Main Results:

  • Generated electron beams with charges up to 0.5 nC at energies exceeding 1 MeV.
  • Achieved electron beam acceleration to the ~10 MeV scale.
  • Observed a correlation between acceleration, relativistic self-focused laser filaments, and intense broadband light flashes.

Conclusions:

  • Low-energy laser-driven acceleration is feasible with optimized plasma conditions.
  • The observed phenomena, including wave breaking and optical emission, are key to efficient acceleration.
  • This advancement paves the way for portable laser-driven acceleration applications.