Phys. Rev. E 67, 066501 (2003) [5 pages]Properties of the ultrashort gain length, self-amplified spontaneous emission free-electron laser in the linear regime and saturationReceived 13 December 2001; published 4 June 2003 VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within a single-pass 4-m undulator. The experiment was performed at the Accelerator Test Facility at BNL, using a high brightness 70-MeV electron beam. A gain length shorter than 18 cm has been obtained, yielding a total gain of 2×108 at saturation. The FEL performance, including the spectral, angular, and statistical properties of SASE radiation, has been characterized for different electron beam conditions. Results are compared to the three-dimensional SASE FEL theory and start-to-end numerical simulations of the entire injector, transport, and FEL systems. An agreement between simulations and experimental results has been obtained at an unprecedented level of detail. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.67.066501
DOI:
10.1103/PhysRevE.67.066501
PACS:
41.60.Cr, 41.60.Ap, 41.85.Ja
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