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This study introduces a novel active Q-switched x-ray regenerative amplifier free-electron laser (FEL) scheme. It achieves fully coherent, high-brightness hard x rays at high repetition rates, advancing FEL science.

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Area of Science:

  • Physics
  • Laser Science
  • Materials Science

Background:

  • Existing x-ray free-electron laser (FEL) facilities struggle to produce fully coherent and stable x rays.
  • Future scientific applications require enhanced x-ray properties beyond current capabilities.

Purpose of the Study:

  • To propose and investigate an active Q-switched x-ray regenerative amplifier FEL scheme.
  • To achieve fully coherent, high-brightness, hard x rays at high repetition rates.

Main Methods:

  • Theoretical and numerical studies of the proposed FEL scheme.
  • Electron-beam phase space manipulation for controlling cavity quality factor (Q).
  • Exploration of various accelerator, x-ray cavity, and undulator parameters.

Main Results:

  • Demonstration of a flexible scheme for controlling x-ray cavity Q and output radiation.
  • Potential for producing fully coherent, high-brightness, hard x rays.
  • High-repetition rate capability.

Conclusions:

  • The active Q-switched x-ray regenerative amplifier FEL scheme offers a promising path towards next-generation coherent x-ray sources.
  • This approach provides flexibility in tailoring x-ray output properties.
  • The findings pave the way for advanced applications in various scientific fields.