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Figure 3
Measured spectra of the fundamental harmonic (a) and the third harmonic (b) spontaneous emission with gd = 120 mm at the resonant wavelength of ∼855 nm. The undulator gaps were 124 mm (K = 2.07) for the fundamental harmonic and 87.8 mm (K = 4.10) for the third harmonic. The electron beam current in a single-bunch operation was 1.9 mA in (a) and 2.9 mA in (b).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 4| May 2014| Pages 654-661
doi:10.1107/S160057751400678X
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