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

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

2005-08-11

arxiv.org/abs/hep-ex/0508026v6

Phys.Rev.Lett. 96 (2006) 114801

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.96.114801

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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