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FEL performance achieved at PAL-XFEL using a three-chicane bunch compression scheme

2019; Wiley; Volume: 26; Issue: 4 Linguagem: Inglês

10.1107/s1600577519005861

1600-5775

Heung-Sik Kang, Haeryong Yang, Gyujin Kim, Hoon Heo, Inhyuk Nam, Chang-Ki Min, Changbum Kim, Soung Youl Baek, Hyo-Jin Choi, Geonyeong Mun, Byoung Ryul Park, Young Jin Suh, Dong Cheol Shin, Jinyul Hu, Juho Hong, Seonghoon Jung, Sanghee Kim, KwangHoon Kim, Donghyun Na, Soung Soo Park, Yong Jung Park, Jang-Hui Han, Young Gyu Jung, Seong Hun Jeong, Min Jae Kim, Hong Gi Lee, Sang‐Bong Lee, Woul-Woo Lee, Bonggi Oh, Hyung Suh, Ki-Hyeon Park, Heung-Soo Lee, Donish Z. Khan, T. Raubenheimer, Juhao Wu,

Particle accelerators and beam dynamics

PAL-XFEL utilizes a three-chicane bunch compression (3-BC) scheme (the very first of its kind in operation) for free-electron laser (FEL) operation. The addition of a third bunch compressor allows for more effective mitigation of coherent synchrotron radiation during bunch compression and an increased flexibility of system configuration. Start-to-end simulations of the effects of radiofrequency jitter on the electron beam performance show that using the 3-BC scheme leads to better performance compared with the two-chicane bunch compression scheme. Together with the high performance of the linac radiofrequency system, it enables reliable operation of PAL-XFEL with unprecedented stability in terms of arrival timing, pointing and intensity; an arrival timing jitter of better than 15 fs, a transverse position jitter of smaller than 10% of the photon beam size, and an FEL intensity jitter of smaller than 5% are consistently achieved.