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Title: LHC aperture and ULO restrictions : are they a possible limitation in 2016?
Authors: Mirarchi, Daniele
Bruce, Roderik
Giovannozzi, P.
Hermes, Pascal Dominik
Redaelli, Stefano
Salvachua, Belen
Valentino, Gianluca
Wenninger, Jorg
Keywords: Large Hadron Collider (France and Switzerland)
Colliders (Nuclear physics)
Collimators (Optical instrument)
Issue Date: 2016
Publisher: CERN
Citation: Mirarchi, D., Bruce, R., Giovannozzi, P., Hermes, P. D., Redaelli, S., Salvachua, B.,...Wenninger, J. (2016). LHC aperture and ULO restrictions : are they a possible limitation in 2016?. 6th Evian Workshop on LHC Beam Operation, Evian Les Bains.
Abstract: Precise knowledge of the available machine aperture is a crucial parameter for the LHC operations. Thus, aperture measurements are performed every year during the machine commissioning, and dedicated Machine Development (MD) runs for validation of possible future optics. A significant beam loss activity in cell 15R8 triggered various studies that revealed the presence of an unexpected aperture restriction due to an Unidentified Lying Object (ULO) in Beam 2. The LHC aperture in 2015 and the unexpected restriction due to the ULO are reviewed in this paper, also in view of their possible impact on 2016 operations.
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