FEL spectral measurements at LCLS

J. Welch, F. J. Decker, Y. Ding, P. Emma, A. Fisher, J. Frisch, Z. Huang, R. Iverson, H. Loos, M. Messerschmidt, H. D. Nuhn, D. Ratner, J. Turner, J. Wu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We report measurements made at LCLS of average and single shot spectra of x-ray FEL radiation, including correlations with chirp and bunch current. And, for normaland over-compressed beams, we show the relationship between the electron energy distributions before the undula-tor and FEL spectra. We find the bandwidth of normally compressed beams can approach the theoretical minimum SASE bandwidth, though only for relative weak beams. Over-compressed beams can have large bandwidth with fwhm of 2% or more and pulse energy comparable to normally compressed beams. In this case the bandwidth is dominated by electron energy spread and the FEL radiation is probably chirped.

Original languageEnglish (US)
Title of host publicationFEL 2011 - 33rd International Free Electron Laser Conference
Pages461-464
Number of pages4
StatePublished - Dec 1 2011
Externally publishedYes
Event33rd International Free Electron Laser Conference, FEL 2011 - Shanghai, China
Duration: Aug 22 2011Aug 26 2011

Publication series

NameFEL 2011 - 33rd International Free Electron Laser Conference

Other

Other33rd International Free Electron Laser Conference, FEL 2011
CountryChina
CityShanghai
Period8/22/118/26/11

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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  • Cite this

    Welch, J., Decker, F. J., Ding, Y., Emma, P., Fisher, A., Frisch, J., Huang, Z., Iverson, R., Loos, H., Messerschmidt, M., Nuhn, H. D., Ratner, D., Turner, J., & Wu, J. (2011). FEL spectral measurements at LCLS. In FEL 2011 - 33rd International Free Electron Laser Conference (pp. 461-464). (FEL 2011 - 33rd International Free Electron Laser Conference).