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Article: Research results from X.J. Wang and co-authors update knowledge of physics.
- Article from:
- Physics Week
- Article date:
- November 10, 2009
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According to recent research from the United States, "We report the first experimental characterization of efficiency and spectrum enhancement in a laser-seeded free-electron laser using a tapered undulator. Output and spectra in the fundamental and third harmonic were measured versus distance for uniform and tapered undulators."
"With a 4% field taper over 3 m, a 300% (50%) increase in the fundamental (third harmonic) output was observed. A significant improvement in the spectra with the elimination of sidebands was observed using a tapered undulator," wrote X.J. Wang and colleagues.
The researchers concluded: "The experiment is in good agreement with ...