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Towards higher frequencies in a compact prebunched waveguide THz-FEL.

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Waveguide terahertz (THz) free-electron-lasers (FELs) offer tunable, high-power THz sources. This study characterizes waveguide THz FEL spectral properties, including simultaneous lasing and wavelength tuning.

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Area of Science:

  • Physics
  • Engineering

Background:

  • Free-electron-lasers (FELs) are crucial for generating tunable, high-power terahertz (THz) radiation.
  • Waveguides enhance electron-photon coupling in THz FELs, enabling efficient radiation generation.

Purpose of the Study:

  • To characterize the spectral properties of a compact waveguide THz FEL.
  • To investigate simultaneous lasing at multiple frequencies and wavelength tunability.

Main Methods:

  • Utilizing a waveguide within a THz FEL setup.
  • Varying electron beam energy to tune radiation wavelength.
  • Ensuring prebunched electron injection at the resonant wavelength scale.

Main Results:

  • Demonstrated simultaneous lasing at two distinct frequencies.
  • Successfully tuned the radiation wavelength in the high-frequency branch by adjusting beam energy.
  • Confirmed the influence of waveguide dispersion on radiation characteristics.

Conclusions:

  • Waveguide THz FELs provide a versatile platform for generating tunable, high-power THz radiation.
  • The spectral properties, including frequency and bandwidth, are significantly influenced by waveguide dispersion and electron beam parameters.