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Efficient propagation of the polarization from laser photons to positrons through Compton scattering and electron-positron pair creation

T. Omori·M. Fukuda·T. Hirose·Y. Kurihara·R. Kuroda·M. Nomura·A. Ohashi·T. Okugi·K. Sakaue·T. Saito·J. Urakawa·M. Washio·I. Yamazaki
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Abstract

We 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 scatterings and electron-positron pair creations. Using a circularly polarized laser beam of 532 nm scattered off a high-quality electron beam with the energy of 1.28 GeV, we obtained polarized positrons with an intensity of 10^4 e+/bunch. Magnitude of positron polarizations was determined as 73+-15(sta) +-19(sys)% by means of a newly designed positron polarimeter.

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T. Omori, M. Fukuda, T. Hirose, Y. Kurihara, R. Kuroda, M. Nomura, A. Ohashi, T. Okugi, K. Sakaue, T. Saito, J. Urakawa, M. Washio, I. Yamazaki. 2006-02-21. Efficient propagation of the polarization from laser photons to positrons through Compton scattering and electron-positron pair creation. https://doi.org/10.1103/physrevlett.96.114801

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