The SLEGS beamline of SSRF

Abstract

The Shanghai Laser Electron Gamma Source (SLEGS, located in BL03SSID) beamline at the Shanghai Synchrotron Radiation Facility (SSRF) is a Laser Compton Scattering (LCS) gamma source used for the investigation of nuclear structure, which is in extensive demand in fields such as nuclear astrophysics, nuclear cluster structure, polarization physics, and nuclear energy. The beamline is based on the inverse Compton scattering of 10640 nm photons on 3.5 GeV electrons and a gamma source with variable energy by changing the scattering angle from 20\(^\circ\) to 160\(^\circ\). \(\gamma\) rays of 0.25\(-\)21.1 MeV can be extracted by the scheme consisting of the interaction chamber, coarse collimator, fine collimator, and attenuator. The maximum photon flux for 180\(^\circ\) is approximately \(10^{7}\) photons/s at the target at 21.7 MeV, with a 3-mm-diameter beam. The beamline was equipped with four types of spectrometers for experiments in (\(\gamma\),\(\gamma\)’), (\(\gamma\),n), (\(\gamma\),p), and (\(\gamma,\!\alpha\)). At present, Nuclear Resonance Fluorescence (NRF) spectrometry, Flat-Efficiency neutron Detector (FED) spectrometry, neutron Time-Of-Flight (TOF) spectrometry, and Light-Charged Particle (LCP) spectrometry methods have been developed.