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, Masakazu Washio, K. Yokoya

    Research output: Contribution to journalArticle

    34 Citations (Scopus)

    Abstract

    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
    Volume500
    Issue number1-3
    DOIs
    Publication statusPublished - 2003 Nov 3

    Fingerprint

    Colliding beam accelerators
    Positrons
    positrons
    rays
    Lasers
    Electron beams
    electron beams
    lasers
    electron-positron pairs
    collisions
    Compton scattering
    emittance
    Electrons
    high energy electrons
    high current
    electron scattering
    mirrors
    requirements
    Polarization
    polarization

    Keywords

    • Compton scattering
    • Linear collider
    • Polarized positron

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics

    Cite this

    Design of a polarized positron source for linear colliders. / Omori, T.; Aoki, T.; Dobashi, K.; Hirose, T.; Kurihara, Y.; Okugi, T.; Sakai, I.; Tsunemi, A.; Urakawa, J.; Washio, Masakazu; Yokoya, K.

    In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 500, No. 1-3, 03.11.2003, p. 232-252.

    Research output: Contribution to journalArticle

    Omori, T. ; Aoki, T. ; Dobashi, K. ; Hirose, T. ; Kurihara, Y. ; Okugi, T. ; Sakai, I. ; Tsunemi, A. ; Urakawa, J. ; Washio, Masakazu ; Yokoya, K. / Design of a polarized positron source for linear colliders. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2003 ; Vol. 500, No. 1-3. pp. 232-252.
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    AU - Omori, T.

    AU - Aoki, T.

    AU - Dobashi, K.

    AU - Hirose, T.

    AU - Kurihara, Y.

    AU - Okugi, T.

    AU - Sakai, I.

    AU - Tsunemi, A.

    AU - Urakawa, J.

    AU - Washio, Masakazu

    AU - Yokoya, K.

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    AB - 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%.

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    KW - Polarized positron

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