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Design of an Interaction Region with Head-On Collisions for the ILC

Abstract : 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 head-on 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.
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Submitted on : Tuesday, September 19, 2006 - 5:34:58 PM
Last modification on : Wednesday, September 16, 2020 - 4:26:01 PM

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R. Appleby, D. Angal-Kalinin, F. Jackson, M. Alabau Pons, P. Bambade, et al.. Design of an Interaction Region with Head-On Collisions for the ILC. Tenth European Particle Accelerator Conference "EPAC'06", Jun 2006, Edinburgh, United Kingdom. pp.MOPLS060. ⟨in2p3-00096652⟩



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