| Summary: | 碩士 === 國立清華大學 === 原子科學研究所 === 84 === 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 CO2 laser. In this
method, the pulsed CO2 laser provides the gate trigger signals,
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 g-ray with the highest energy of 3.021MeV was back-scattered
after the 0.1172eV CO2 laser photons colliding with the
relativistic electrons. The S/N ratio is about 42.5 with the
electron beam current being 19mA. Also, the measured electron
beam energy is 1.3058GeV with relative uncertainty 0.13%.
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