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Phys. Rev. Lett. 100, 210801 (2008) [4 pages]Observation of Polarized Positrons from an Undulator-Based Source
Received 8 March 2008; published 29 May 2008
An experiment (E166) at the Stanford Linear Accelerator Center has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with Geant4 simulations that include the dominant polarization-dependent interactions of electrons, positrons, and photons in matter. ©2008 The American Physical Society REFERENCES (14)
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