Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies
2016
The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron
Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from
electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron
beam in a high-Z target. Positron polarization up to 82% have been measured for an initial electron beam
momentum of 8.19 MeV=c, limited only by the electron beam polarization. This technique extends
polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron
beam physics to a wide community.
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