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Guided Mode Evolution and Ionization Injection in Meter-Scale Multi-GeV Laser Wakefield Accelerators.

J E Shrock1, E Rockafellow1, B Miao1

  • 1Institute for Research in Electronics and Applied Physics and Department of Physics, <a href="https://ror.org/047s2c258">University of Maryland</a>, College Park, Maryland 20742, USA.

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|August 9, 2024
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Summary
This summary is machine-generated.

Laser wakefield electron accelerators exhibit a new nonlinear propagation regime in plasma waveguides. This regime enhances electron injection and produces multi-GeV electron beams with tunable energy spectra.

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Area of Science:

  • Plasma Physics
  • Accelerator Physics
  • Nonlinear Optics

Background:

  • Laser wakefield acceleration (LWFA) is a promising technology for compact electron accelerators.
  • Controlling electron beam properties in LWFA remains a challenge.
  • Plasma waveguides are used to guide intense laser pulses over long distances.

Purpose of the Study:

  • To investigate the nonlinear propagation dynamics of intense laser pulses in meter-scale plasma waveguides.
  • To understand the impact of laser-plasma interactions on electron injection and acceleration.
  • To characterize the resulting electron beam properties.

Main Methods:

  • Experimental investigation of multi-GeV laser wakefield electron accelerators in meter-scale, low-density hydrodynamic plasma waveguides.
  • Utilizing continuously and locally doped gas jets for plasma generation.
  • Development of a three-stage model for drive laser pulse evolution and ionization injection.

Main Results:

  • Discovery of a new nonlinear propagation regime dominated by sustained mode beating in the ponderomotively modified plasma channel.
  • Emergent mode beating leads to axially modulated ionization injection.
  • Generation of multi-GeV electron energy spectra with multiple quasimonoenergetic peaks or single peaks with <10% energy spread, depending on gas doping.

Conclusions:

  • The sustained mode beating in plasma waveguides is a key factor in controlling LWFA performance.
  • The developed three-stage model accurately characterizes the observed phenomena and experimental results.
  • This work paves the way for enhanced control over electron beam generation in LWFA systems.