Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 26, Issue -, Pages 1496-1502Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577519008841
Keywords
XFELs; self-seeding; channel-cut crystals
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Funding
- Special Postdoctral Researcher Program of RIKEN
- JSPS KAKENHI [18K18307]
- Grants-in-Aid for Scientific Research [18K18307] Funding Source: KAKEN
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A channel-cut Si(111) crystal with a channel width of 90 mu m was developed for achieving reflection self-seeding in hard X-ray free-electron lasers (XFELs). With the crystal a monochromatic seed pulse is produced from a broadband XFEL pulse generated in the first undulator section with an optical delay of 119fs at 10keV. The small optical delay allows a temporal overlap between the seed optical pulse and the electron bunch by using a small magnetic chicane for the electron beam placed between two undulator sections. Peak reflectivity reached 67%, which is reasonable compared with the theoretical value of 81%. By using this monochromator, a monochromatic seed pulse without broadband background in the spectrum was obtained at SACLA with a conversion efficiency from a broadband XFEL pulse of 2 x 10(-2), which is similar to 10 times higher than the theoretical efficiency of transmission self-seeding using a thin diamond (400) monochromator.
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