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Tenth European Particle Accelerator Conference "EPAC'06", Edinburgh : Royaume-Uni (2006)
Design of an Interaction Region with Head-On Collisions for the ILC
R. Appleby, D. Angal-Kalinin, F. Jackson, M. Alabau Pons1, P. Bambade1, J. Brossard1, O. Dadoun1, Cécile Rimbault1, L. Keller, Y. Nosochkov, A. Seryi, J. Payet2, O. Napoly2, C. Rippon2, D. Uriot2

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.
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
2 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
Physique/Physique/Physique des accélérateurs
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