An X-ray harmonic separator for next-generation synchrotron X-ray sources and X-ray free-electron lasers

Inoue, I.; Osaka, T.; Tamasaku, K.; Ohashi, H.; Yamazaki, H.; Goto, S.; Yabashi, M.

doi:10.1107/S160057751800108X

Figure 1
(a)–(d) Spectra of undulator radiation at typical third-generation SR and ULESR sources, simulated with parameters in Table 1

for a fixed vertical angular aperture size (10 µrad) and different horizontal aperture sizes (5, 10, 15, 20, 25, 30 µrad) at 30 m downstream of the source. (a) and (b) Spectra of fundamental undulator radiation at (a) the third-generation SR and (b) ULESR source. The insets show the spectra normalized to the flux at 10 keV. (c) and (d) Spectra of the third-harmonic undulator radiation at (c) the third-generation SR and (d) ULESR source. The insets show the spectra normalized to the flux at 30 keV. The undulator spectra at the third-generation source are almost the same shape for different conditions of the aperture size (inset of a and c). On the other hand, the shapes of undulator spectra at the ULESR source depend on the aperture size (b and d). For horizontal apertures less than 10 µrad, the spectral peaks are almost symmetric with a narrow bandwidth ( $[\Delta{E}/E]$ ≃ 1%) (b and d). (e) Comparison of the spectra of undulator radiation at the third-generation SR and ULESR sources simulated with the same parameters for an angular aperture size of 10 µrad (horizontal) × 10 µrad (vertical).

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 25| Part 2| March 2018| Pages 346-353

https://doi.org/10.1107/S160057751800108X

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