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Total Internal Reflection Absorption Spectroscopy (TIRAS) for the Detection of Solvated Electrons at a Plasma-liquid Interface
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Electron self-injection and trapping into an evolving plasma bubble.

S Kalmykov1, S A Yi, V Khudik

  • 1The Department of Physics and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA. kalmykov@physics.utexas.edu

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The blowout regime of laser wakefield acceleration can produce high-energy electron beams. Bubble expansion and contraction enable self-injection and control of electron beam properties.

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Area of Science:

  • Plasma physics
  • Particle acceleration
  • Laser-plasma interactions

Background:

  • Laser wakefield acceleration (LWFA) shows promise for generating high-energy electron beams.
  • The blowout regime in LWFA is particularly interesting for producing monochromatic beams.
  • Understanding electron self-injection mechanisms is crucial for controlling beam properties.

Purpose of the Study:

  • To investigate the mechanism of self-injection in the blowout regime of LWFA.
  • To derive criteria for electron trapping and bubble expansion.
  • To explore how bubble dynamics influence electron beam generation.

Main Methods:

  • Analytical theory
  • Particle-in-cell (PIC) simulations
  • Semianalytic nonstationary Hamiltonian theory

Main Results:

  • Slow temporal expansion of the plasma bubble can cause self-injection of background plasma electrons.
  • Sufficient criteria for electron trapping and bubble expansion rate were derived.
  • A combination of bubble expansion and contraction leads to monoenergetic electron beams.

Conclusions:

  • The temporal dynamics of plasma bubbles are key to controlling electron injection and beam quality in LWFA.
  • The derived criteria provide a theoretical framework for optimizing LWFA parameters.
  • This study advances the understanding of generating high-quality electron beams using laser-plasma interactions.