Abstract
A longitudinal polarized positron beam is foreseen for the international linear collider (ILC). A proof-of-principle experiment has been performed in the final focus test beam at SLAC to demonstrate the production of polarized positrons for implementation at the ILC. The E166 experiment uses a 1 m long helical undulator in a 46.6 GeV electron beam to produce a few MeV photons with a high degree of circular polarization. These photons are then converted in a thin target to generate longitudinally polarized e + and e −. The positron polarization is measured using a Compton transmission polarimeter. The data analysis has shown asymmetries in the expected vicinity of 3.4% and ∼1% for photons and positrons respectively and the expected positron longitudinal polarization is covering a range from 50% to 90%.
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Kovermann, J., Stahl, A., Mikhailichenko, A.A. et al. The E166 experiment: Development of an undulator-based polarized positron source for the international linear collider. Pramana - J Phys 69, 1165–1169 (2007). https://doi.org/10.1007/s12043-007-0248-5
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DOI: https://doi.org/10.1007/s12043-007-0248-5