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Summary

Laser-heater systems control free-electron lasers (FELs) by managing electron beam energy spread. This study shows a persistent electron beam modulation enabling multicolor extreme-ultraviolet FEL pulse generation.

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Area of Science:

  • Physics
  • Quantum Optics
  • Accelerator Physics

Background:

  • Laser-heater systems are crucial for optimizing high-gain free-electron lasers (FELs) in the X-ray range.
  • These systems controllably increase electron bunch energy spread, suppressing microbunching instability that limits FEL performance.

Purpose of the Study:

  • To demonstrate that laser-heater-induced electron beam modulation can persist until the undulator entrance.
  • To exploit this modulation for controlling FEL spectral properties, specifically generating multicolor extreme-ultraviolet pulses.

Main Methods:

  • Utilizing the microbunching instability to maintain a long-wavelength modulation of the electron beam.
  • Employing frequency mixing of modulations from the laser heater and a seed laser within the electron beam.
  • Conducting an experimental demonstration at the FERMI FEL facility.

Main Results:

  • A coherent longitudinal modulation of the electron beam was observed to persist until the undulator entrance.
  • Successful generation of multicolor extreme-ultraviolet (XUV) FEL pulses was achieved.
  • Demonstrated a novel method for controlling FEL spectral properties.

Conclusions:

  • Laser-heater systems can induce persistent electron beam modulations beneficial for FEL operation.
  • This technique offers a new pathway for generating multicolor XUV FEL pulses.
  • The experimental results validate the proposed method for advanced FEL applications.