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Future upgrades of the CERN Large Hardon Collider (LHC) may require improved cleaning performance of its collimation system, in particular for the High-Luminosity project that aims at doubling the design stored beam energy of 362 MJ. Different collimation improvements are under study, and the usage of bent crystals is one of them. Crystal collimation relies on coherently deflecting halo particles onto one single collimator absorber, as opposed to the present multi-stage system that relies on several secondary collimators absorbing the halo particles out-scattered by amorphous primaries. Although promising results were obtained in experimental tests at the CERN Super Proton Synchrotron (SPS), the feasibility of crystal collimation at the LHC is considered mandatory before relying on this advanced concept for the future. The design of a crystal collimation setup for low-intensity demonstration with beam has been produced. The installation of two bent crystals in the betatron cleaning system has been carried out in 2014 for vertical and horizontal collimation beam tests in 2015. In this seminar, after a brief introduction of the present LHC collimation system and of crystal collimation, the final crystal layouts are presented. The achievable cleaning performance, predicted from state-of-the-art crystal simulation tools benchmarked on SPS data, is presented and compared to that of the present system. Plans for 2015 beam tests are then discussed, together with preliminary results of first experimental tests performed in the LHC at 450 GeV.
ATS Seminars Organisers: H. Burkhardt (BE), M. Modena (TE), T. Stora (EN)
Coffee / tea will be served after the seminar in room 30/7-012