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The Shanghai Laser Electron Gamma Source (SLEGS) is a beamline at the Shanghai Synchrotron Radiation Facility (SSRF). It employs inverse Compton scattering between a 10640 nm CO$_2$ laser and 3.5 GeV electrons from the storage ring to generate an energy-tunable gamma-ray beam. Since the electron beam energy in the synchrotron is fixed, SLEGS adopts the slant-scattering mode, where the gamma energy is adjusted by varying the interaction angle between the laser and the electron beam. SLEGS provides gamma rays with energies ranging from 0.66 to 21.7 MeV and a flux of 10$^5$–10$^7$ photons/s, making it well-suited for photonuclear reaction studies. SLEGS is equipped with four specialized detectors for photonuclear reaction studies, including (γ,n), (γ,γ′), and (γ,p) reactions. It has also pioneered and developed supplementary experimental techniques, such as the gamma-activation method. Notable scientific results include research on positron generation and polarization measurements of the gamma beam in slant-scattering geometry.
SLEGS was officially opened to users in 2023. Since then, a number of users have conducted experiments at the facility, yielding a series of notable results. This report summarizes the recent two years of development and scientific achievements at SLEGS, with the aim of providing potential collaborators and users with information to support future research using the SLEGS beam.
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