Design of a prototype split-and-delay unit for XFEL pulses, and their evaluation by synchrotron radiation X-rays
| Autor: | Masami Ando, Kazumichi Namikawa, Masahiko Ishino, Jun'ya Sakamoto, Jun'ichiro Mizuki, Kenji Ohwada |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Nuclear and High Energy Physics Radiation business.industry Synchrotron radiation 02 engineering and technology 021001 nanoscience & nanotechnology Interference (wave propagation) Laser 01 natural sciences Coherence length law.invention Interferometry Optics law Picosecond 0103 physical sciences Femtosecond 010306 general physics 0210 nano-technology business Instrumentation Energy (signal processing) |
| Zdroj: | Journal of Synchrotron Radiation. 24:95-102 |
| ISSN: | 1600-5775 |
| DOI: | 10.1107/s1600577516017744 |
| Popis: | 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° 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. |
| Databáze: | OpenAIRE |
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