Design of a polarized positron source for linear colliders

T. Omori*, T. Aoki, K. Dobashi, T. Hirose, Y. Kurihara, T. Okugi, I. Sakai, A. Tsunemi, J. Urakawa, M. Washio, K. Yokoya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We propose a design of a polarized positron source for linear colliders. The design is based on electron-positron pair creation from polarized γ-rays which are produced by Compton scattering of circularly polarized laser light off a high-energy electron beam. Polarized positrons are created from those γ-rays incident on a thin conversion target. A future linear collider of the TeV-energy region requires an extraordinary large number of positrons (∼1 × 1010 positrons/bunch) in a multi-bunch time structure. To meet these requirements, our design employs a high-current, low-emittance electron beam of 5.8 GeV, 10 CO2 lasers, and 200 laser-electron collision-points. At each collision point, a pair of specially designed parabolic mirrors is installed to achieve efficient head-on collisions. This system allows us to produce high-intensity polarized γ-rays, which effectively generate high-intensity polarized positrons with the magnitude of polarization greater than 50%.

Original languageEnglish
Pages (from-to)232-252
Number of pages21
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
Publication statusPublished - 2003 Nov 3


  • Compton scattering
  • Linear collider
  • Polarized positron

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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