Development of polarized positron source via laser-Compton scattering

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Studies were done at the Accelerator Test Facility (ATF) in KEK. A vacuum chamber, named Compton chamber, is developed to achieve efficient head-on collision of laser and electron beams. The results of collision experiment to generate γ-rays (Emax = 56 MeV) were as follows.1) number of generated γ-rays : 1 x 10^6/pulse2) pulse duration : about 30 p sec3) polarization of γ-ray the beam was measuredThis was the highest intensity of γ-rays generated in this energy region. And this was the first demonstration of polarization measurement of the γ-ray beam of such short pulse duration. It was demonstrated that our proposed method can generate high intensity γ-ray beam efficiently. We think this was the good progress for the development of the polarized positron source.