Second and third harmonic measurements at the linac coherent light source
- D. Ratner
- A. Brachmann
- F. J. Decker
- Y. Ding
- D. Dowell
- P. Emma
- A. Fisher
- J. Frisch
- S. Gilevich
- Z. Huang
- P. Hering
- R. Iverson
- J. Krzywinski
- H. Loos
- M. Messerschmidt
- H. D. Nuhn
- T. Smith
- J. Turner
- J. Welch
- W. White
- J. Wu
Publication date
June 2011
DOI Publisher
American Physical Society Journal
1098-4402Abstract
The linac coherent light source (LCLS) is a self-amplified spontaneous emission (SASE) free-electron laser (FEL) operating at fundamental photon energies from 0.5 to 10 keV. Characterization of the higher harmonics present in the FEL beam is important to users, for whom harder x rays can either extend the useful operating wavelength range or increase experimental backgrounds. We present measurements of the power in both the second and third harmonics, and compare the results to expectations from simulations. We also present studies of the transport of harmonics to the users, and the harmonic power as a function of electron beam quality
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