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Energy measurement of relativistic electron beams by laser Compton scattering

Ian C. Hsu, Cha-Ching Chu, Chuan-Ing Yu
1996 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
Laser Compton scattering by relativistic electrons provides the energy information associated with electron beams in an accelerator. Determining the electron beam energy by this method depends primarily on the signal to noise (S/N) ratio associated with laser Compton scattering. In this study, we propose a method to enhance the S/N ratio by synchronous measurement with a high peak power pulsed CO 2 laser. In this method, the pulsed CO 2 laser provides the gate trigger signals, and the delay
more » ... , and the delay times of the triggers are optimized to obtain a maximum S/N ratio. In the storage ring of Taiwan Light Source, a γ-ray with the highest energy of 3.021MeV was backscattered after the 0.1172eV CO 2 laser photons colliding with the relativistic electrons. The S/N ratio is around 42.5 with the electron beam current being 19mA. Also, the measured electron beam energy is 1.3058GeV with relative uncertainty of 0.13%.
doi:10.1103/physreve.54.5657 pmid:9965753 fatcat:km6yoi2fcvafxdekktglofuaii