Application of quasi-forbidden multilayer Bragg reflection for monochromatization of hard X-ray FEL SASE pulses
✍ Scribed by Vladimir Bushuev; Liubov Samoylova
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 257 KB
- Volume
- 635
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
Preserving and manipulating the complex time structure of the X-ray Free Electron Laser (XFEL) pulses on subfemtosecond scales presents a new challenge for X-ray optics. Promising candidates for ultra-short Xray pulses optics are periodic multilayer (ML) structures. We present a theoretical investigation of the XFEL pulse propagation through ML structures by an approach based on decomposition of short pulses into a set of plane waves by Fourier transform and application of known methods of X-ray optics. An analysis of coherent properties of XFEL pulse propagated through the ML structures is also presented. It is shown that bandwidth of quasi-forbidden reflections from the small d-spacing Al 2 O 3 /B 4 C structure can be less than pulse bandwidth with reflectivity up to 80%. Such structures can be used for hard X-ray FEL pulses monochromatization and diagnostics.