Design study of laser Compton scattering with relativistic electron to measure the electron beam energy

This paper presents the design study of a system to measure the electron beam energy in an accelerator. The method of Compton scattering between laser photons and relativistic electrons was used. By knowing the backscattered photon energy, the electron beam energy can be deduced. The scattering mechanism between the laser photons and the relativistic electrons was well known. The optical system for the laser light was design to match the laser beam with the electron beam in order to enhance the backscattered photon flux. The implementation of the system in the electron beam transport line in SRRC and the optimization method will be discussed. A CO₂ laser was chosen to produce 3 MeV backscattered photons that will be detected with a high purity germanium detector (HPGe). The reason of using HPGe and the predicted results will be presented. Under this study, a 0.5% energy measurement accuracy was expected