Frontiers in Physics (Nov 2023)

Towards a compact all-optical terahertz-driven electron source

  • Hanxun Xu,
  • Hanxun Xu,
  • Renkai Li,
  • Lixin Yan,
  • Yingchao Du,
  • Qili Tian,
  • Wenhui Huang,
  • Chuanxiang Tang

DOI
https://doi.org/10.3389/fphy.2023.1292194
Journal volume & issue
Vol. 11

Abstract

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In this study, we propose a physical design of a compact all-optical terahertz (THz)-driven electron source. The 300-mm accelerator beamline, powered by a Joule-level laser system, can be easily integrated into the tabletop scale. A THz-driven electron gun, a tapered dielectric-loaded cylindrical waveguide, THz-driven bunch compressors, and permanent magnetic solenoids (PMSs) have been designed and optimized. Dynamic simulations show that the electron source can deliver 19 fC electron beams at 3 MeV, with a normalized transverse emittance of 0.079 π.mm.mrad. A minimum relative energy spread of 0.04% or a minimum root-mean-square (RMS) bunch length of 6.1 fs can be achieved. Sensitivity analysis shows that the THz-driven electron source can effectively work with a laser power jitter within 1.5%. Simulation studies also reveal the potential of the designed THz-driven electron source for achieving high-quality ultrafast electron diffraction (UED). Prototype THz-driven electron guns have been fabricated and are currently under testing, and more comprehensive results will be reported in future works.

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