Observation of Polarized Positrons from an Undulator-Based Source
- Alexander, G.
- Barley, J.
- Gharibyan, V.
- Hast, C.
- Iverson, R.
- Kolanoski, H.
- Kovermann, J.
- Laihem, K.
- Lohse, T.
- McDonald, K. T.
- Mikhailichenko, A. A.
- Moortgat-Pick, G. A.
- Batygin, Y.
- Pahl, P.
- Pitthan, R.
- Pöschl, R.
- Reinherz-Aronis, E.
- Riemann, S.
- Schälicke, A.
- Schüler, K. P.
- Schweizer, T.
- Scott, D.
- Sheppard, J. C.
- Berridge, S.
- Stahl, A.
- Szalata, Z. M.
- Walz, D.
- Weidemann, A. W.
- Bharadwaj, V.
- Bower, G.
- Bugg, W.
- Decker, F.-J.
- Dollan, R.
- Efremenko, Y.
Publication date
January 2008
DOIAbstract
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
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