Researchers from the Shanghai Advanced Research Institute of the Chinese Academy of Sciences and Deutsches Elektronen-Synchrotron DESY reported that a continuous-wave (CW) X-ray free-electron lasers (XFELs) could generate terawatt-class attosecond X-ray pulses at megahertz repetition rates, based on comprehensive simulations of Shanghai HIgh repetitioN rate XFEL and Extreme light facility (SHINE).

In a study published in Nature Photonics,the Free-electron Laser Team of the Shanghai Advanced Research Institute (SARI),Chinese Academy of Sciences developed an innovative approach by employing beating-frequency laser modulation of electron beams to precisely tailor the beam structure and produce continuously tunable THz radiation.

Recently, the Free-Electron Laser (FEL) team at the Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences experimentally demonstrated their independently proposed concept of Direct-Amplification Enabled Harmonic Generation Free-Electron Laser (DEHG-FEL) for the first time, and successfully achieved its lasing and stable operation. This marks a key milestone toward realizing X-ray FEL sources operating at megahertz (MHz) repetition rates. The results were published in Physical Review Letters and were highlighted as an Editors’ Suggestion.

Professor Huaidong Jiang and Researcher Jiadong Fan from the Great Science Center of ShanghaiTech University, and Professor Ian Robinson from University College London, are the co-corresponding authors.

From July 5th to 10th, 2022, Coherence 2022: The International Conference on Phase Retrieval and Coherent Scattering were successfully held. The conference was held in a hybrid way with an onset conference and a virtual meeting. More than 500 people from more than 40 units around the world attended the conference. 35 international experts and 21 domestic experts were invited to make a total of 46 oral presentations.