A high intensity beam line of γγ-rays up to 22 MeV energy based on Compton backscattering

Shanghai Laser Electron Gamma Source, a high intensity beam line of γγ-ray, has been proposed recently. The beam line is expected to generate γγ-rays up to the maximum energy of 22 MeV by Compton backscattering between a CO2CO2 laser and electrons in the 3.5 GeV storage ring of the Shanghai Synchrotron Radiation Facility. The flux of non-collimated γγ-rays is estimated to be 109109–1010s-1 when a CO2CO2 laser of several hundred Watt power is employed. We will discuss physics issues in the design and optimization of the beam line.