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Evidence for microbunching "sidebands" in a saturated free-electron laser using coherent optical transition radiation

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Author

  • A. H. Lumpkin
  • R. Dejus
  • J. W. Lewellen
  • Magnus Berglund
  • S. Biedron
  • M. Borland
  • Y. C. Chae
  • M. Erdmann
  • Z. Huang
  • K. J. Kim
  • Y. Li
  • S. V. Milton
  • E. Moog
  • D. W. Rule
  • V. Sajaev
  • B. X. Yang
Show all

Summary, in English

We report the first measurements of z -dependent coherent optical transition radiation (COTR) due to electron-beam microbunching at high gains (>10(4) ) including saturation of a self-amplified spontaneous emission free-electron laser (FEL). In these experiments the fundamental wavelength was near 530 nm, and the COTR spectra exhibit the transition from simple spectra to complex spectra (5% spectral width) after saturation. The COTR intensity growth and angular distribution data are reported as well as the evidence for transverse spectral dependencies and an "effective" core of the beam being involved in microbunching.

Department/s

Publishing year

2002

Language

English

Pages

4-4

Publication/Series

Physical Review Letters

Volume

88

Issue

23

Document type

Journal article

Publisher

American Physical Society

Topic

  • Physical Sciences
  • Natural Sciences

Keywords

  • FEL
  • GAIN
  • WIGGLER
  • DIAGNOSTICS
  • BEAM
  • AMPLIFIED SPONTANEOUS-EMISSION

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114