The E166 experiment: Development of an undulator-based polarized positron source for the international linear collider

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. BowerF. 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 aim 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%.

Original languageEnglish
Pages (from-to)1165-1169
Number of pages5
JournalPramana - Journal of Physics
Volume69
Issue number6
DOIs
StatePublished - Dec 2007

Keywords

  • Compton transmission polarimeter
  • Helical undulator
  • International linear collider
  • Polarized positron

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