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Figure 3
(Left) Histogram of the FEL relative line-width at 43.6 nm (statistics over a sequence of 420 spectra). (Center and right) Single-shot spectral images from the spectrometer CCD at 43.6 nm and 23.8 nm, respectively, of the 6th and 11th harmonics of the seed (THG mode). The images show the intensity as a function of wavelength on the horizontal axis. The vertical axis maps the vertical shape of the FEL intensity distribution at the spectrometer. The average relative bandwidth (r.m.s.) is about 0.035% at 43.6 nm and 0.037% for a similar sequence at 23.8 nm. The average energy per pulse in these two sets of data was 80 µJ (43.6 nm) and 60 µJ (23.8 nm) with an r.m.s. standard deviation of about 10 µJ in both cases.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 3| May 2015| Pages 485-491
https://doi.org/10.1107/S1600577515005366
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