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Träfflista för sökning "WFRF:(Smid O.) srt2:(2022)"

Sökning: WFRF:(Smid O.) > (2022)

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1.
  • Maitrallain, A., et al. (författare)
  • Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator
  • 2022
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 24:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Laser wakefield accelerators commonly produce on-axis, low-divergence, high-energy electron beams. However, a high charge, annular shaped beam can be trapped outside the bubble and accelerated to high energies. Here we present a parametric study on the production of low-energy-spread, ultra-relativistic electron ring beams in a two-stage gas cell. Ring-shaped beams with energies higher than 750 MeV are observed simultaneously with on axis, continuously injected electrons. Often multiple ring shaped beams with different energies are produced and parametric studies to control the generation and properties of these structures were conducted. Particle tracking and particle-in-cell simulations are used to determine properties of these beams and investigate how they are formed and trapped outside the bubble by the wake produced by on-axis injected electrons. These unusual femtosecond duration, high-charge, high-energy, ring electron beams may find use in beam driven plasma wakefield accelerators and radiation sources.
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2.
  • Streeter, M. J.V., et al. (författare)
  • Characterization of laser wakefield acceleration efficiency with octave spanning near-IR spectrum measurements
  • 2022
  • Ingår i: Physical Review Accelerators and Beams. - 2469-9888. ; 25:10
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on experimental measurements of energy transfer efficiencies in a GeV-class laser wakefield accelerator. Both the transfer of energy from the laser to the plasma wakefield and from the plasma to the accelerated electron beam was diagnosed by simultaneous measurement of the deceleration of laser photons and the acceleration of electrons as a function of plasma length. The extraction efficiency, which we define as the ratio of the energy gained by the electron beam to the energy lost by the self-guided laser mode, was maximized at 19±3% by tuning the plasma density and length. The additional information provided by the octave-spanning laser spectrum measurement allows for independent optimization of the plasma efficiency terms, which is required for the key goal of improving the overall efficiency of laser wakefield accelerators.
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