Speaker
Description
Shanghai Light Source has been operated since 2009 to provide synchrotron radiations to 40 beamlines of the electron storage ring at a fixed electron energy, 3.5 GeV. The Shanghai Laser Electron Gamma Source (SLEGS) is approved as one of 16 beamlines in the Phase II project in 2016 to produce energy-tunable gamma-ray beams in the inverse Compton slant-scattering of laser photons from a 100 W CO2 laser on the 3.5 GeV electrons as well as in the back-scattering [1,2]. The laser Compton slant-scattering was pioneered as early as in 1996 [3] and more recently used to produced gamma rays [4]. The slant-scattering makes the usage of energy-tunable gamma-ray beams compatible with that of the synchrotron radiation in synchrotron radiation facilities operated at a fixed electron beam energy worldwide.
The SLEGS is designed to produce gamma rays in the energy range of 0.66 – 21.7 MeV with a flux of 105 – 107 photons/s and an energy spread of 4.2 – 4.6 % with an aperture of 2 mm of the double collimator system [2]. We have confirmed the generation of gamma-ray beams in the slant-scattering from 20o to 160o as well as in the back-scattering at 180o in the commissioning of the SLEGS beamline. We plan to open the SLEGS beamline to international users in the summer of 2022. We present the performance of the SLEGS beamline based on results of the commissioning and test measurements.
[1] H.H. Xu et al., to be submitted to Nuclear Inst. and Methods, Physics Research A.
[2] Z.R. Hao et al., Nuclear Inst. and Methods, Physics Research A 1013, 165638 (2021).
[3] R.W. Schoenlein et al., Science 274, 236-238 (1996).
[4] Y. Taira et al., Nuclear Inst. Methods, Phys. Res. A 652, 696-700 (2011).