CERN Accelerating science

Published Articles
Report number	CERN-ACC-2017-158
Title	Progress with Long-Range Beam-Beam Compensation Studies for High Luminosity LHC
Author(s)	Rossi, Adriana (CERN) ; Aberle, Oliver (CERN) ; Albertone, Joel (CERN) ; Barnyakov, Alexey (Novosibirsk, IYF) ; Bertarelli, Alessandro (CERN) ; Boccard, Christian (CERN) ; Carra, Federico (CERN) ; Cattenoz, Gregory (CERN) ; Delaup, Yorick (CERN) ; Fartoukh, Stephane (CERN) ; Fitterer, Miriam (Fermilab) ; Gobbi, Giorgia (CERN) ; Lendaro, Jerome (CERN) ; Levichev, Alexey (Novosibirsk, IYF) ; Nikiforov, Danila (Novosibirsk, IYF) ; Papaphilippou, Yannis (CERN) ; Patapenka, Andrei (Fermilab) ; Perini, Diego (CERN) ; Redaelli, Stefano (CERN) ; Schmickler, Hermann (CERN) ; Stancari, Giulio (Fermilab) ; Valishev, Alexander (Fermilab) ; Zanoni, Carlo (CERN)
Publication	2017
Number of pages	4
In:	8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA115
DOI	10.18429/JACoW-IPAC2017-TUPVA115
Subject category	Accelerators and Storage Rings
Project	CERN HL-LHC
Abstract	Long-range beam-beam (LRBB) interactions can be a source of emittance growth and beam losses in the LHC during physics and will become even more relevant with the smaller '* and higher bunch intensities foreseen for the High Luminosity LHC upgrade (HL-LHC), in particular if operated without crab cavities. Both beam losses and emittance growth could be mitigated by compensat-ing the non-linear LRBB kick with a correctly placed current carrying wire. Such a compensation scheme is currently being studied in the LHC through a demonstration test using current-bearing wires embedded into col-limator jaws, installed either side of the high luminosity interaction regions. For HL-LHC two options are considered, a current-bearing wire as for the demonstrator, or electron lenses, as the ideal distance between the particle beam and compensating current may be too small to allow the use of solid materials. This paper reports on the ongoing activities for both options, covering the progress of the wire-in-jaw collimators, the foreseen LRBB experiments at the LHC, and first considerations for the design of the electron lenses to ultimately replace material wires for HL-LHC.
Copyright/License	CC-BY-3.0

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