Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 25, Issue -, Pages 289-292Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577517016186
Keywords
microfocusing; X-ray optics; KB mirror; X-ray free-electron laser; PAL-XFEL; NCI
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Funding
- Ministry of Science, ICT and Future Planning (MSIP), the Republic of Korea, through the PAL-XFEL project
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The Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) is a recently commissioned X-ray free-electron laser (XFEL) facility that provides intense ultrashort X-ray pulses based on the self-amplified spontaneous emission process. The nano-crystallography and coherent imaging (NCI) hutch with forward-scattering geometry is located at the hard X-ray beamline of the PAL-XFEL and provides opportunities to perform serial femtosecond crystallography and coherent X-ray diffraction imaging. To produce intense high-density XFEL pulses at the interaction positions between the X-rays and various samples, a microfocusing Kirkpatrick-Baez (KB) mirror system that includes an ultra-precision manipulator has been developed. In this paper, the design of a KB mirror system that focuses the hard XFEL beam onto a fixed sample point of the NCI hutch, which is positioned along the hard XFEL beamline, is described. The focusing system produces a two-dimensional focusing beam at approximately 2 mu m scale across the 2-11 keV photon energy range. XFEL pulses of 9.7 keV energy were successfully focused onto an area of size 1.94 mu m x 2.08 mu m FWHM.
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