期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 21, 期 -, 页码 466-472出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577514004780
关键词
X-ray polarization optics; X-ray free-electron lasers; circular polarization
资金
- SACLA User's Equipment Development Proposal
A diamond phase retarder was applied to control the polarization states of a hard X-ray free-electron laser (XFEL) in the photon energy range 5-20 keV. The horizontal polarization of the XFEL beam generated from the planar undulators of the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) was converted into vertical or circular polarization of either helicity by adjusting the angular offset of the diamond crystal from the exact Bragg condition. Using a 1.5 mm-thick crystal, a high degree of circular polarization, 97%, was obtained for 11.56 keV monochromatic X-rays, whereas the degree of vertical polarization was 67%, both of which agreed with the estimations including the energy bandwidth of the Si 111 beamline monochromator.
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