Hard X-ray free-electron laser with femtosecond-scale timing jitter. Issue 11 (November 2017)

• Record Type: Journal Article
• Authors: Kang, Heung-Sik; Min, Chang-Ki; Heo, Hoon; Kim, Changbum; Yang, Haeryong; Kim, Gyujin; Nam, Inhyuk; Baek, Soung; Choi, Hyo-Jin; Mun, Geonyeong; Park, Byoung; Suh, Young; Shin, Dong; Hu, Jinyul; Hong, Juho; Jung, Seonghoon; Kim, Sang-Hee; Kim, KwangHoon; Na, Donghyun; Park, Soung; Park, Yong; Han, Jang-Hui; Jung, Young; Jeong, Seong; Lee, Hong; Lee, Sangbong; Lee, Sojeong; Lee, Woul-Woo; Oh, Bonggi; Suh, Hyung; Parc, Yong; Park, Sung-Ju; Kim, Min; Jung, Nam-Suk; Kim, Young-Chan; Lee, Mong-Soo; Lee, Bong-Ho; Sung, Chi-Won; Mok, Ik-Su; Yang, Jung-Moo; Lee, Chae-Soon; Shin, Hocheol; Kim, Ji; Kim, Yongsam; Lee, Jae; Park, Sang-Youn; Kim, Jangwoo; Park, Jaeku; Eom, Intae; Rah, Seungyu; Kim, Sunam; Nam, Ki; Park, Jaehyun; Park, Jaehun; Kim, Sangsoo; Kwon, Soonam; Park, Sang; Kim, Kyung; Hyun, Hyojung; Kim, Seung; Kim, Seonghan; Hwang, Sun-min; Kim, Myong; Lim, Chae-yong; Yu, Chung-Jong; Kim, Bong-Soo; Kang, Tai-Hee; Kim, Kwang-Woo; Kim, Seung-Hwan; Lee, Hee-Seock; Lee, Heung-Soo; Park, Ki-Hyeon; Koo, Tae-Yeong; Kim, Dong-Eon; Ko, In;
• Is Part Of: Nature photonics. Volume 11:Issue 11(2017)
• Page Start: 708
• Page End: 713
• Publication Date: 2017-11
• Subjects: Photonics -- Periodicals; 621.36
• DOI: 10.1038/s41566-017-0029-8
• Languages: English
• ISSNs: 1749-4885

Abstract

Abstract The hard X-ray free-electron laser at the Pohang Accelerator Laboratory (PAL-XFEL) in the Republic of Korea achieved saturation of a 0.144 nm free-electron laser beam on 27 November 2016, making it the third hard X-ray free-electron laser in the world, following the demonstrations of the Linac Coherent Light Source (LCLS) and the SPring-8 Angstrom Compact Free Electron Laser (SACLA). The use of electron-beam-based alignment incorporating undulator radiation spectrum analysis has allowed reliable operation of PAL-XFEL with unprecedented temporal stability and dispersion-free orbits. In particular, a timing jitter of just 20 fs for the free-electron laser photon beam is consistently achieved due to the use of a state-of-the-art design of the electron linear accelerator and electron-beam-based alignment. The low timing jitter of the electron beam makes it possible to observe Bi(111) phonon dynamics without the need for timing-jitter correction, indicating that PAL-XFEL will be an extremely useful tool for hard X-ray time-resolved experiments. The Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) in South Korea has now entered operation with a timing jitter of just 20 fs.