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Relativistic Electrons from Vacuum Laser Acceleration Using Tightly Focused Radially Polarized Beams.

Jeffrey Powell1, Spencer W Jolly2, Simon Vallières1

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Researchers created a relativistic electron beam using laser acceleration in gas. Higher atomic number gases like krypton enhance electron energy gain, reaching 1.43 MeV with efficient acceleration.

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Area of Science:

  • Plasma Physics
  • Laser-driven particle acceleration
  • Relativistic electron beams

Background:

  • Laser-driven acceleration offers a compact alternative to traditional accelerators.
  • Vacuum laser acceleration (VLA) utilizes intense laser fields to accelerate charged particles.

Purpose of the Study:

  • To generate a tabletop pulsed relativistic electron beam using VLA.
  • To investigate the influence of laser parameters and gas species on electron acceleration.
  • To achieve high electron energies with moderate laser power.

Main Methods:

  • Tightly focusing a radially polarized laser beam into a low-density gas.
  • Utilizing vacuum laser acceleration (VLA) principles.
  • Measuring electron energy as a function of laser intensity and gas species.
  • Performing numerical simulations of particle dynamics, including ionization.

Main Results:

  • Generated a pulsed relativistic electron beam at 100 Hz repetition rate.
  • Achieved electron energies up to 1.43 MeV with 98 GW peak laser power.
  • Demonstrated strong dependence of electron energy on atomic ionization dynamics.
  • Observed enhanced electron injection and higher energies with higher atomic number gases (e.g., krypton).

Conclusions:

  • Efficient electron acceleration is achievable with moderate laser power and optimized gas ionization.
  • Higher atomic number gases facilitate favorable electron injection at the laser field peak.
  • This method provides a compact and efficient route to generating relativistic electron beams.