BLM Thresholds and UFOs

In 2016, the thresholds of more than half of the LHC Beam Loss Monitors connected to the Beam Interlock System were changed throughout the year. Many of the changes were in one or another way related to losses induced by micron scale dust particles often referred to as Unidentified Falling Objects (...

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Detalles Bibliográficos
Autores principales: Lechner, A, Albert, M, Auchmann, B, Castro, C Bahamonde, Grob, L, Holzer, E B, Jowett, J, Kalliokoski, M, Naour, S Le, Lunt, A, Mereghetti, A, Papotti, G, Schmidt, R, Veness, R, Verweij, A, Willering, G, Wollmann, D, Xu, C, Zerlauth, M
Lenguaje:eng
Publicado: CERN 2017
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2293680
Descripción
Sumario:In 2016, the thresholds of more than half of the LHC Beam Loss Monitors connected to the Beam Interlock System were changed throughout the year. Many of the changes were in one or another way related to losses induced by micron scale dust particles often referred to as Unidentified Falling Objects (UFOs). This paper summarizes the UFO trends, the number of UFO-induced dumps and quenches in 2015 and 2016, and shows how dumps were distributed between arcs and straight sections. The impact of 2016 threshold changes on the number of dumps in the arcs is analyzed and it is estimated how many dumps and quenches would have occurred if other threshold strategies would have been adopted. The paper concludes with a brief summary of non-UFO-related threshold changes and an outlook for 2017.

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