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The E166 experiment: Development of an undulator-based polarized positron source for the international linear collider |
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| Authors: | J Kovermann A Stahl A A Mikhailichenko D Scott G A Moortgat-Pick V Gharibyan P Pahl R Pöschl K P Schüler K Laihem S Riemann A Schälicke R Dollan H Kolanoski T Lohse T Schweizer K T McDonald Y Batygin V Bharadwaj G Bower F -J Decker C Hast R Iverson J C Sheppard Z Szalata D Walz A Weidemann G Alexander E Reinherz-Aronis S Berridge W Bugg Y Efrimenko |
| Institution: | (1) RWTH Aachen, Aachen, Germany;(2) Cornell University, Ithaca, USA;(3) CCLRC Daresbury, Warrington, UK;(4) University of Durham, Durham, UK;(5) DESY, Hamburg, Germany;(6) DESY, Zeuthen, Germany;(7) Humboldt University, Berlin, Germany;(8) Princeton University, Princeton, USA;(9) SLAC, Stanford, USA;(10) University of Tel Aviv, Tel Aviv, Israel;(11) University of Tennessee, Knoxville, USA |
| 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%. |
| Keywords: | International linear collider helical undulator polarized positron Compton transmission polarimeter |
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