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90 m β * optics for ATLAS/ALFA

Abstract : We describe a high β∗ optics developed for the ATLAS detector at the LHC interaction point IP1. Roman Pots have been installed 240 m left and right of IP1 to allow to measure the absolute luminosity and the total elastic cross section for ATLAS with ALFA (Absolute Luminosity for ATLAS). Ultimately, it is planned to perform these mea- surements at a very high β∗ of 2625 m. Here we describe a new, intermediate β∗ = 90 m optics, which has been opti- mized for compatibility with the present LHC running con- ditions. We describe the main features and the expected performance of this optics for ALFA.
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http://hal.in2p3.fr/in2p3-00675024
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Submitted on : Tuesday, February 28, 2012 - 5:26:41 PM
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S. Cavalier, P. Puzo, H. Burkhardt, A. Peskov. 90 m β * optics for ATLAS/ALFA. 2nd International Particle Accelerator Conference (IPAC'11), Sep 2011, San Sebastian, Spain. pp.1798-1800. ⟨in2p3-00675024⟩

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