Design of an interaction region with head-on collisions for the ILC

J. Payet, O. Napoly, C. Rippon, D. Uriot, D. Angal-Kalinin, F. Jackson, M. Alabau-Pons, P. Bambade, J. Brossard, O. Dadoun, C. Rimbault, L. Keller, Y. Nosochkov, A. Seryi, R. Appleby

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    An interaction region (IR) with head-on collisions is considered as an alternative to the baseline configuration of the International Linear Collider (ILC) which includes two IRs with finite crossing-angles (2 and 20 mrad). Although more challenging for the beam extraction, the head-on scheme is favoured by the experiments because it allows a more convenient detector configuration, particularly in the forward region. The optics of the headon extraction is revisited by separating the e+ and e- beams horizontally, first by electrostatic separators operated at their LEP nominal field and then using a defocusing quadrupole of the final focus beam line. In this way the septum magnet is protected from the beamstrahlung power. Newly optimized final focus and extraction optics are presented, including a first look at post-collision diagnostics. The influence of parasitic collisions is shown to lead to a region of stable collision parameters. Disrupted beam and beamstrahlung photon losses are calculated along the extraction elements.
    Original languageEnglish
    Title of host publicationEPAC 2006 - Contributions to the Proceedings|EPAC - Contrib. Proc.
    PublisherEuropean Physical Society Accelerator Group (EPS-AG)
    Number of pages2
    Publication statusPublished - 2006
    Event10th European Particle Accelerator Conference, EPAC 2006 - Edinburgh
    Duration: 1 Jul 2006 → …


    Conference10th European Particle Accelerator Conference, EPAC 2006
    Period1/07/06 → …


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