LHC aperture and ULO restrictions: are they a possible limitation in 2016?

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 acti...

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Detalles Bibliográficos
Autores principales: Mirarchi, D, Bruce, R, Giovannozzi, M, Hermes, P, Redaelli, S, Salvachua, B, Valentino, G, Wenninger, J
Lenguaje:eng
Publicado: CERN 2016
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2294521
Descripción
Sumario: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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