Speaker
Description
Free-electron lasers (FELs) provide ultrashort, coherent, and wavelength-tunable radiation for a wide range of scientific applications. Here, we present the demonstration of a laser-wakefield-acceleration (LWFA)-driven FEL operating at a central wavelength of 40 nm. By using a compact 0.8 J laser system and carefully optimizing the plasma density, electron injection, laser wavefront, and gas-jet stability, we generated high-quality monoenergetic electron beams with excellent shot-to-shot reproducibility. Start-to-end simulations, including the acceleration, beam transport, and FEL interaction processes, show good agreement with the experimental results. The observed FEL radiation exhibits an exponential gain of approximately 20, marking an important step toward compact, tunable XUV and x-ray FEL sources.
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