Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 24, Issue -, Pages 95-102Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577516017744
Keywords
split-and-delay unit; Bragg case interferometer; XFEL; synchrotron radiation X-rays
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Funding
- RIKEN
- Japan Atomic Energy Agency
- Grants-in-Aid for Scientific Research [26400327] Funding Source: KAKEN
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A prototype split-and-delay unit (SDU) for X-ray free-electron laser (XFEL) pulses is proposed based on the Graeff-Bonse four-Bragg-reflection interferometer by installing 12.5 degrees slopes. The SDU can continuously provide a delay time from approximately -20 to 40 ps with a resolution of less than 26 fs. Because the SDU was constructed from a monolithic silicon crystal, alignment is straightforward. The obtained thoroughputs of the SDU reached 0.7% at 7.46 keV and 0.02% at 14.92 keV. The tunability of the delay time using the proposed SDU was demonstrated by finding the interference effects of the split X-rays, and the time resolution of the proposed SDU was evaluated using the width of the interference pattern recorded on the X-ray charge-coupled device camera by changing the energy, i.e. longitudinal coherence length, of the incident X-rays. It is expected that the proposed SDU will be applicable to XFEL experiments using delay times from tens of femtoseconds to tens of picoseconds, e.g. intensity correlation measurements.
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