Efficient propagation of polarization from laser photons to positrons through compton scattering and electron-positron pair creation |
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Authors: | Omori T Fukuda M Hirose T Kurihara Y Kuroda R Nomura M Ohashi A Okugi T Sakaue K Saito T Urakawa J Washio M Yamazaki I |
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Affiliation: | KEK: High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki 305-0801, Japan. |
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Abstract: | We have demonstrated for the first time the production of highly polarized short-pulse positrons with a finite energy spread in accordance with a new scheme that consists of two-quantum processes, such as inverse Compton scattering and electron-positron pair creation. Using a circularly polarized laser beam of 532 nm scattered off a high-quality, 1.28 GeV electron beam, we have obtained polarized positrons with an intensity of 2 x 10(4) e+ /bunch. The magnitude of positron polarization has been determined to be 73 +/- 15(stat) +/- 19(syst)% by means of a newly designed positron polarimeter. |
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