Observation of polarized positrons from an undulator-based source

G. Alexander*, J. Barley, Y. Batygin, S. Berridge, V. Bharadwaj, G. Bower, W. Bugg, F. J. Decker, R. Dollan, Y. Efremenko, V. Gharibyan, C. Hast, R. Iverson, H. Kolanoski, J. Kovermann, K. Laihem, T. Lohse, K. T. McDonald, A. A. Mikhailichenko, G. A. Moortgat-PickP. Pahl, R. Pitthan, R. Pöschl, E. Reinherz-Aronis, S. Riemann, A. Schälicke, K. P. Schüler, T. Schweizer, D. Scott, J. C. Sheppard, A. Stahl, Z. M. Szalata, D. Walz, A. W. Weidemann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number210801
JournalPhysical Review Letters
Issue number21
StatePublished - 29 May 2008


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