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Electro-optic spatial decoding on the spherical-wavefront Coulomb fields of plasma electron sources.

K Huang1, T Esirkepov2, J K Koga2

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This study introduces electro-optic spatial decoding for relativistic electron beams in laser wakefield acceleration. We found the electron beam

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Area of Science:

  • Accelerator Physics
  • Plasma Physics
  • Optics

Background:

  • Accurate detection of relativistic electron beams is crucial for accelerator physics.
  • Electro-optic diagnostics offer non-destructive, single-shot measurement capabilities for electron beams.
  • Laser wakefield acceleration (LWFA) is a promising technique for generating high-quality electron beams.

Purpose of the Study:

  • To investigate the application of electro-optic spatial decoding technique in laser wakefield acceleration.
  • To accurately characterize the Coulomb field structure of relativistic electron beams produced by LWFA.
  • To develop a generalized temporal mapping relationship for electro-optic signals with spherical wavefronts.

Main Methods:

  • Experimental measurements using an electro-optic crystal placed near the gas target.
  • Analytical calculations to model the Coulomb field structure.
  • Numerical simulations to validate experimental and analytical findings.

Main Results:

  • The Coulomb field of the electron beam was experimentally demonstrated to possess a spherical wavefront.
  • This spherical wavefront model contradicts previous widely used models.
  • A generally applicable temporal mapping relationship was derived for spherical wavefront signals.

Conclusions:

  • The study provides a more accurate model for the Coulomb field of electron beams in LWFA.
  • This research enhances the utility of electro-optic diagnostics in laser plasma acceleration.
  • The findings contribute to improved understanding and control of relativistic electron beams.