Phys. Rev. Lett. 95, 054801 (2005) [4 pages]Observation of Anomalously Large Spectral Bandwidth in a High-Gain Self-Amplified Spontaneous Emission Free-Electron LaserReceived 14 March 2005; published 25 July 2005 Observation of ultrawide bandwidth, up to 15% full-width, high-gain operation of a self-amplified spontaneous emission free-election laser (SASE FEL) is reported. This type of lasing is obtained with a strongly chirped beam (δE/E∼1.7%) emitted from the accelerator. Because of nonlinear pulse compression during transport, a short, high current bunch with strong mismatch errors is injected into the undulator, giving high FEL gain. Start-to-end simulations reproduce key features of the measurements and provide insight into mechanisms, such as angular spread in emitted photon and electron trajectory distributions, which yield novel features in the radiation spectrum. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.054801
DOI:
10.1103/PhysRevLett.95.054801
PACS:
41.60.Cr, 41.75.−i, 41.85.Ew, 42.60.Jf
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