Characterization of second harmonic afterburner radiation at the LCLS

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

Research output: Contribution to conferencePaperpeer-review

6 Scopus citations


During commissioning of the Linac Coherent Light Source (LCLS) x-ray Free Electron Laser (FEL) at the SLAC National Accelerator Laboratory it was shown that saturation lengths much shorter than the installed length of the undulator line can routinely be achieved [1]. This frees undulator segments that can be used to provide enhanced spectral properties and at the same time, test the concept of FEL Afterburners. In December 2009 a project was initiated to convert undulator segments at the down-beam end of the undulator line into Second Harmonic Afterburners (SHAB) to enhance LCLS radiation levels in the 10-20 keV energy range. This is being accomplished by replacement of gap-shims increasing the fixed gaps from 6.8 mm to 9.9 mm, which reduces their K values from 3.50 to 2.25 and makes the segments resonant at the second harmonic of the upstream unmodified undulators. This paper reports experimental results of the commissioning of the SHAB extension to LCLS.

Original languageEnglish (US)
Number of pages6
StatePublished - 2010
Externally publishedYes
Event32nd International Free Electron Laser Conference, FEL 2010 - Malmo City, Sweden
Duration: Aug 23 2010Aug 27 2010


Other32nd International Free Electron Laser Conference, FEL 2010
CityMalmo City

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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