Polarized positron production at MeV electron accelerators

TL;DR

The PEPPo experiment demonstrates efficient transfer of polarization from electrons to positrons at MeV energies, achieving up to 82% polarization, thus enabling polarized positron production in lower-energy accelerators.

Contribution

This work introduces a novel method for producing highly polarized positrons using MeV electron beams, expanding applications beyond traditional GeV accelerators.

Findings

Positron polarization up to 82% achieved

Efficient polarization transfer demonstrated at 8.19 MeV/c

Technique extends polarized positron production to MeV accelerators

Abstract

The Polarized Electrons for Polarized Positrons (PEPPo) experiment has demonstrated the efficient transfer of polarization from electrons to positrons produced by the bremsstrahlung radiation of a polarized electron beam in a high-$Z$ target. Positron polarization up to 82\% has been measured for an initial electron beam momentum of 8.19 MeV/$c$, limited only by the electron beam polarization. Combined with the high intensity and high polarization performances of polarized electron sources, this technique extends efficient polarized positron capabilities from GeV to MeV electron accelerators. This presentation reviews the PEPPo proof-of-principle experiment and addresses the perspectives for future applications.