Hong-Wei Wang 1,2,3 Gong-Tao Fan 1,2,3 Long-Xiang Liu 1,2 Hang-Hua Xu 1,2 Wen-Qing Shen 1,2,3
Yu-Gang Ma 2,4,6 Hiroaki Utsunomiya 1,5 Long-Long Song 1 Xi-Guang Cao 1,2,3 Zi-Rui Hao 2,3
Kai-Jie Chen 2,6 Sheng Jin 2,3 Yu-Xuan Yang 2,7 Xin-Rong Hu 2,3 Xin-Xiang Li 2,3 Pan Kuang 2,3
Vol.33, Issue 7, Article number:87 (2022)
Plain Language Summary Research Story DOI：https://doi.org/10.11889/nst.33.7.87
The state-of-the-art Shanghai Laser Electron Gamma Source (SLEGS) has officially completed its commissioning which lasted from July to December 2021. Other than a back-scattering mode, for the first time, a slant-scattering mode is adopted in the SLEGS beamline to generate powerful quasi-monoenergetic gamma-ray beams systematically. With an energy spread of 2 – 15 %, a gamma-ray beam with energy ranging from 0.25 to 21.1 MeV in slant-scattering at collision angles ranging from 20 – 160° is generated. In back-scattering at 180°, the beam achieves maximum energy of 21.7 MeV. Notably, a 2 % energy resolution can achieved with a 1-mm or smaller collimator. The SLEGS beamline primarily comprises four components: i) a 100-W CO2 laser and laser transport; ii) an interaction chamber (slant-scattering) and a multi-function chamber (back-scattering); iii) two-stage coarse and fine collimators and a gamma flux attenuator; and iv) an experimental hutch, an experimental detector, a gamma absorber, and a data acquisition system. In order to establish a more in-depth understanding of the energy resolution, more realistic Geant4 simulations can be deployed to carry out a thorough analysis in the future.
The laser Compton scattering (LCS) gamma source is currently the most advanced quasi-monoenergetic gamma-ray source supporting photonuclear physics research. Meanwhile, slant-scattering is an essential technology to produce gamma-ray beams with tunable energy at synchrotron radiation facilities which operate at fixed electron beam energy. Hence, in an attempt to establish a world-class high-energy laser electron gamma source, scientists in China have recently commissioned the Shanghai Laser Electron Gamma Source (SLEGS) which adopt both slant- and back-scattering mode to yield MeV gamma-ray beams. By doing so, a new milestone has been achieved by the Shanghai Synchrotron Radiation Facility (SSRF) for having a total of 16 beamline stations in its Phase II Project. With the readiness of SLEGS in facilitating both basic and applied research in nuclear physics, scientists will have more space and opportunity to contribute to the advance of the nation’s nuclear technology.
The SDG Impact
To-date, the number of facilities with high-energy laser electron gamma sources dedicated to nuclear science studies remains scanty globally. Since SLEGS is a high-potential multi-functional experimental platform, the addition of SLEGS to the Shanghai Synchrotron Radiation Facility will be of significant impact to the expansion of nuclear research, especially in China. By supporting the advancement of nuclear technology, this study shows good alignment with United Nations Sustainable Development Group (UNSDG) 9: Industry, innovation & infrastructure.