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Alexander, G; Barley, J; Batygin, Y; Berridge, S; Bharadwaj, V; Bower, G; Bugg, W; Decker, F-J; Dollan, R; Efremenko, Y; Gharibyan, V; Hast, C; Iverson, R; Kolanoski, H; Kovermann, J; Laihem, K; Lohse, T; McDonald, K T; Mikhailichenko, A A; Moortgat-Pick, G A; Pahl, P; Pitthan, R; Pöschl, R; Reinherz-Aronis, E; Riemann, S; Schälicke, A; Schüler, K P; Schweizer, T; Scott, D; Sheppard, J C; Stahl, A; Szalata, Z M; Walz, D; Weidemann, A W
Physical review letters, 05/2008, Volume: 100, Issue: 21Journal Article
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.
