High-brightness self-seeded X-ray free-electron laser covering the 3.5 keV to 14.6 keV range
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SCOPUS
- Title
- High-brightness self-seeded X-ray free-electron laser covering the 3.5 keV to 14.6 keV range
- Authors
- Nam, Inhyuk; Min, Chang-Ki; Oh, Bonggi; Kim, Gyujin; Na, Donghyun; Suh, Young Jin; Yang, Haeryong; Cho, Myung Hoon; Kim, Changbum; Kim, Min-Jae; Shim, Chi Hyun; Ko, Jun Ho; Heo, Hoon; Park, Jaehyun; Kim, Jangwoo; Park, Sehan; Park, Gisu; Kim, Seonghan; Chun, Sae Hwan; Hyun, HyoJung; Lee, Jae Hyuk; Kim, Kyung Sook; Eom, Intae; Rah, Seungyu; Shu, Deming; Kim, Kwang-Je; Terentyev, Sergey; Blank, Vladimir; Shvyd’ko, Yuri; Lee, Sang Jae; Kang, Heung-Sik
- Date Issued
- 2021-06
- Publisher
- Nature Pub. Group
- Abstract
- A self-seeded X-ray free-electron laser (XFEL) is a promising approach to realize bright, fully coherent free-electron laser (FEL) sources in the hard X-ray domain that have been a long-standing issue with longitudinal coherence remaining challenging. At the Pohang Accelerator Laboratory XFEL, we have demonstrated a hard X-ray self-seeded XFEL with a peak brightness of 3.2 �� 1035 photons s?1 mm?2 mrad?2 0.1% bandwidth (BW)?1 at 9.7 keV. The bandwidth (0.19 eV) is about 1/70 times as wide (close to the Fourier transform limit) and the peak spectral brightness is 40 times higher than in self-amplified spontaneous emission (SASE), with substantial improvements in the stability of self-seeding and noticeably suppressed pedestal effects. We could reach an excellent self-seeding performance at a photon energy of 3.5 keV (lowest) and 14.6 keV (highest) with the same stability as the 9.7 keV self-seeding. The bandwidth of the 14.6 keV seeded FEL was 0.32 eV, and the peak brightness was 1.3 �� 1035 photons s?1 mm?1 mrad?1 0.1%BW?1. We show that the use of seeded FEL pulses with higher reproducibility and a cleaner spectrum results in serial femtosecond crystallography data of superior quality compared with data collected using SASE mode. ? 2021, The Author(s), under exclusive licence to Springer Nature Limited part of Springer Nature.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106832
- DOI
- 10.1038/s41566-021-00777-z
- ISSN
- 1749-4885
- Article Type
- Article
- Citation
- Nature Photonics, vol. 15, no. 6, page. 435 - 441, 2021-06
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