Theoretical And Simulation Studies On High Brightness γ-ray Sources Based On The Laser Compton Scattering

With the advent of the high intensity laser technology and high-brightness electron accelerators, a new type of X rays or γ rays source based on Laser Compton scattering has been developed rapidly. This kind of light source can provide quasi-monochromatic, highly polarized, ultrashort pulse, very small solid angle tunable X rays and γ rays. These compact sources are a natural complement to larger-scale 3rd and 4th generation light sources, and can produce MeV-scale photons with unprecedented spectral brightness. These characteristics are highly desirable for a number of applications, including nuclear structure physics, nuclear astrophysics, medical isotopes, nuclear waste treatment, homeland security and industrial applications.The SXFEL test facility is currently under construction in the SSRF campus, with the primary purpose of delivering fully coherent radiation at the wavelength of about 8.8 nm. With energy upgrade, it is possible to push the X-ray wavelength down to the water window(～3 nm) and even the magnetic window(～1 nm). Because of the excellent quality of the electron beam produced by the linear accelerator, we propose to build a high brightness γ ray source at the SXFEL based on the laser Compton scattering. In this dissertation, we study the spectral broadening mechanisms in the laser Compton scattering process. Then we optimize the parameters of the SXFEL and laser parameters to get maximum γ ray yield and thus maximum peak on-axis brightness.Shanghai Laser Electron Gamma ray source(SLEGS) is one of the Phase II beamlines of the SSRF). It is based on the laser Compton scattering between the 3.5GeV electron beam of the SSRF storage ring and the CO2 laser to obtain quasimonochromatic γ rays of 0.4-20 MeV. SLEGS will be used to study low energy polarization nuclear physics, nuclear astrophysics. The second part of this paper is to study the impact of the SLEGS on the operation performance of SSRF, including the effects on the electron beam emittance, the energy spread, and etc.